Main Street Capital Corporation
(Exact name of registrant as specified in its charter)


Title of Each Class		Name of Each Exchange on Which Registered
Common Stock, par value $0.01 per share		New York Stock Exchange
6.125% Notes due 2023		New York Stock Exchange

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes o No þ

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes o No þ

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes þ No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes o No o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. þ

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company" and "emerging growth company" in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No þ

The aggregate market value of the registrant's common stock held by non-affiliates of the registrant as of June 30, 2017, was approximately $2,056.0 million based upon the last sale price for the registrant's common stock on that date.

The number of outstanding common shares of the registrant as of February 22, 2018 was 58,753,792.

Portions of the registrants' definitive Proxy Statement for its 2018 Annual Meeting of Stockholders, to be filed with the Securities and Exchange Commission, are incorporated by reference in this Annual Report on Form 10-K in response to Part III.

This Annual Report on Form 10-K contains forward-looking statements regarding the plans and objectives of management for future operations. Any such forward-looking statements may involve known and unknown risks, uncertainties and other factors which may cause our actual results, performance or achievements to be materially different from future results, performance or achievements expressed or implied by any forward-looking statements. Forward-looking statements, which involve assumptions and describe our future plans, strategies and expectations, are generally identifiable by use of the words "may," "will," "should," "expect," "anticipate," "estimate," "believe," "intend" or "project" or the negative of these words or other variations on these words or comparable terminology. These forward-looking statements are based on assumptions that may be incorrect, and we cannot assure you that the projections included in these forward-looking statements will come to pass. Our actual results could differ materially from those expressed or implied by the forward-looking statements as a result of various factors, including the factors discussed in Item 1A entitled "Risk Factors" in Part I of this Annual Report on Form 10-K and elsewhere in this Annual Report on Form 10-K. Other factors that could cause actual results to differ materially include changes in the economy and future changes in laws or regulations and conditions in our operating areas.

We have based the forward-looking statements included in this Annual Report on Form 10-K on information available to us on the date of this Annual Report on Form 10-K, and we assume no obligation to update any such forward-looking statements, unless we are required to do so by applicable law. However, you are advised to refer to any additional disclosures that we may make directly to you or through reports that we in the future may file with the Securities and Exchange Commission ("SEC"), including subsequent annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K.

Main Street Capital Corporation ("MSCC") is a principal investment firm primarily focused on providing customized debt and equity financing to lower middle market ("LMM") companies and debt capital to middle market ("Middle Market") companies. The portfolio investments of MSCC and its consolidated subsidiaries are typically made to support management buyouts, recapitalizations, growth financings, refinancings and acquisitions of companies that operate in a variety of industry sectors. MSCC seeks to partner with entrepreneurs, business owners and management teams and generally provides "one stop" financing alternatives within its LMM portfolio. MSCC and its consolidated subsidiaries invest primarily in secured debt investments, equity investments, warrants and other securities of LMM companies based in the United States and in secured debt investments of Middle Market companies generally headquartered in the United States.

MSCC was formed in March 2007 to operate as an internally managed business development company ("BDC") under the Investment Company Act of 1940, as amended (the "1940 Act"). MSCC wholly owns several investment funds, including Main Street Mezzanine Fund, LP ("MSMF"), Main Street Capital II, LP ("MSC II") and Main Street Capital III, LP ("MSC III" and, collectively with MSMF and MSC II, the "Funds"), and each of their general partners. The Funds are each licensed as a Small Business Investment Company ("SBIC") by the United States Small Business Administration ("SBA"). Because MSCC is internally managed, all of the executive officers and other employees are employed by MSCC. Therefore, MSCC does not pay any external investment advisory fees, but instead directly incurs the operating costs associated with employing investment and portfolio management professionals.

register as a registered investment adviser under the Investment Advisers Act of 1940, as amended (the "Advisers Act"). Since the External Investment Manager conducts all of its investment management activities for External Parties, it is accounted for as a portfolio investment of MSCC and is not included as a consolidated subsidiary of MSCC in MSCC's consolidated financial statements.

MSCC has elected to be treated for U.S. federal income tax purposes as a regulated investment company ("RIC") under Subchapter M of the Internal Revenue Code of 1986, as amended (the "Code"). As a result, MSCC generally will not pay corporate-level U.S. federal income taxes on any net ordinary taxable income or capital gains that it distributes to its stockholders.

MSCC has certain direct and indirect wholly owned subsidiaries that have elected to be taxable entities (the "Taxable Subsidiaries"). The primary purpose of the Taxable Subsidiaries is to permit MSCC to hold equity investments in portfolio companies which are "pass-through" entities for tax purposes.

Unless otherwise noted or the context otherwise indicates, the terms "we," "us," "our," the "Company" and "Main Street" refer to MSCC and its consolidated subsidiaries, which include the Funds and the Taxable Subsidiaries.

Our principal executive offices are located at 1300 Post Oak Boulevard, 8^th Floor, Houston, Texas 77056. We maintain a Web site on the Internet at www.mainstcapital.com. We make available free of charge on our Web site our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and all amendments to those reports as soon as reasonably practicable after such material is electronically filed with or furnished to the SEC. You may read and copy any materials we file with the SEC at the SEC's Public Reference Room at 100 F Street, NE, Washington, DC 20549. You may obtain information regarding the Public Reference Room by calling the SEC at 1-800-SEC-0330. Information contained on our Web site is not incorporated by reference into this Annual Report on Form 10-K, and you should not consider that information to be part of this Annual Report on Form 10-K.

revenues typically between $150 million and $1.5 billion, and our Middle Market investments generally range in size from $3 million to $20 million. Our private loan ("Private Loan") portfolio investments are primarily debt securities in privately held companies which have been originated through strategic relationships with other investment funds on a collaborative basis. Private Loan investments are typically similar in size, structure, terms and conditions to investments we hold in our LMM portfolio and Middle Market portfolio.

We seek to fill the financing gap for LMM businesses, which, historically, have had limited access to financing from commercial banks and other traditional sources. The underserved nature of the LMM creates the opportunity for us to meet the financing needs of LMM companies while also negotiating favorable transaction terms and equity participations. Our ability to invest across a company's capital structure, from secured loans to equity securities, allows us to offer portfolio companies a comprehensive suite of financing options, or a "one stop" financing solution. Providing customized, "one stop" financing solutions is important to LMM portfolio companies. We generally seek to partner directly with entrepreneurs, management teams and business owners in making our investments. Our LMM portfolio debt investments are generally secured by a first lien on the assets of the portfolio company and typically have a term of between five and seven years from the original investment date.

Our Middle Market portfolio investments primarily consist of direct investments in or secondary purchases of interest-bearing debt securities in privately held companies that are generally larger in size than the companies included in our LMM portfolio. Our Middle Market portfolio debt investments are generally secured by either a first or second priority lien on the assets of the portfolio company and typically have an expected duration of between three and seven years from the original investment date.

Our Private Loan portfolio investments are primarily debt securities in privately held companies which have been originated through strategic relationships with other investment funds on a collaborative basis, and are often referred to in the debt markets as "club deals." Private Loan investments are typically similar in size, structure, terms and conditions to investments we hold in our LMM portfolio and Middle Market portfolio. Our Private Loan portfolio debt investments are generally secured by either a first or second priority lien on the assets of the portfolio company and typically have a term of between three and seven years from the original investment date.

Our other portfolio ("Other Portfolio") investments primarily consist of investments which are not consistent with the typical profiles for our LMM, Middle Market or Private Loan portfolio investments, including investments which may be managed by third parties. In our Other Portfolio, we may incur indirect fees and expenses in connection with investments managed by third parties, such as investments in other investment companies or private funds.

Our portfolio investments are generally made through MSCC and the Funds. MSCC and the Funds share the same investment strategies and criteria, although they are subject to different regulatory regimes (see "Regulation"). An investor's return in MSCC will depend, in part, on the Funds' investment returns as they are wholly owned subsidiaries of MSCC.

level of dividends paid by portfolio companies and the portion of our portfolio debt investments on non-accrual status will directly impact future investment income. While we intend to grow our portfolio and our investment income over the long term, our growth and our operating results may be more limited during depressed economic periods. However, we intend to appropriately manage our cost structure and liquidity position based on applicable economic conditions and our investment outlook. The level of realized gains or losses and unrealized appreciation or depreciation on our investments will also fluctuate depending upon portfolio activity, economic conditions and the performance of our individual portfolio companies. The changes in realized gains and losses and unrealized appreciation or depreciation could have a material impact on our operating results.

During April 2014, we received an exemptive order from the SEC permitting co-investments by us and HMS Income in certain negotiated transactions where co-investing would otherwise be prohibited under the 1940 Act. We have made, and in the future intend to continue to make, such co-investments with HMS Income in accordance with the conditions of the order. The order requires, among other things, that we and the External Investment Manager consider whether each such investment opportunity is appropriate for HMS Income and, if it is appropriate, to propose an allocation of the investment opportunity between us and HMS Income. Because the External Investment Manager may receive performance-based fee compensation from HMS Income, this may provide it an incentive to allocate opportunities to HMS Income instead of us. However, both we and the External Investment Manager have policies and procedures in place to manage this conflict.

During January 2018, we made a new portfolio investment to facilitate the minority recapitalization of Brewer Crane, LLC ("Brewer"), a leading Southern California full-service crane rental service provider. We, along with a co-investor, partnered with Brewer's founder and Chief Executive Officer to facilitate the transaction, with us funding $14.2 million in a combination of first-lien, senior secured term debt and a direct equity investment. Headquartered in Lakeside, California, and founded in 1997, Brewer provides crane rental services to San Diego County and the surrounding Southern California area, offering mobile cranes, tower cranes, skilled operators, construction hoists, hauling, rigging, storage, service and repairs, and miscellaneous equipment rental.

In February 2018, we fully exited our debt and equity investments in SoftTouch Medical Holdings, LLC ("SoftTouch"), a leading provider of home medical equipment and services, serving pediatric patients across the states of Georgia and Alabama. SoftTouch provides a broad array of medical equipment and services to chronically ill youth through its diverse product offerings, including respiratory therapy, enteral feeding,

phototherapy, ventilators, amongst others. We realized a gain of approximately $5.2 million on the exit of our equity investment in SoftTouch.

In February 2018, we made a new portfolio investment to facilitate the management led buyout of DMS Holdco, LLC. ("DMS"), a leading provider of omni-channel direct marketing services. We, along with a co-investor, partnered with the DMS' management team to facilitate the transaction, with us funding $27.2 million in a combination of first-lien, senior secured term debt and a direct equity investment. Headquartered in Portland, Oregon, and founded in 1982, DMS develops and executes end-to-end, omni-channel direct marketing services including strategy, creative design, direct mail production/fulfillment, and digital marketing to various end markets including the FinTech, banking, telecom and technology industries.

During February 2018, we declared regular monthly dividends of $0.190 per share for each of April, May and June 2018. These regular monthly dividends equal a total of $0.570 per share for the second quarter of 2018. The second quarter 2018 regular monthly dividends represent a 2.7% increase from the dividends declared for the second quarter of 2017. Including the dividends declared for the second quarter of 2018, we will have paid $22.530 per share in cumulative dividends since our October 2007 initial public offering.

Our investment team has identified the following investment criteria that it believes are important in evaluating prospective portfolio companies. Our investment team uses these criteria in evaluating investment opportunities. However, not all of these criteria have been, or will be, met in connection with each of our investments:

The Investment Portfolio, as used herein, refers to all of our investments in LMM portfolio companies, investments in Middle Market portfolio companies, Private Loan portfolio investments, Other Portfolio investments, and the investment in the External Investment Manager. Our LMM portfolio investments primarily consist of secured debt, equity warrants and direct equity investments in privately held, LMM

companies based in the United States. Our Middle Market portfolio investments primarily consist of direct investments in or secondary purchases of interest-bearing debt securities in privately held companies based in the United States that are generally larger in size than the companies included in our LMM portfolio. Our Private Loan portfolio investments primarily consist of investments in interest-bearing debt securities in companies that are consistent with the size of companies in our LMM portfolio or our Middle Market portfolio, but are investments that we originate on a collaborative basis with other investment funds, and are often referred to in the debt markets as "club deals." Our Other Portfolio investments primarily consist of investments which are not consistent with the typical profiles for our LMM, Middle Market and Private Loan portfolio investments, including investments which may be managed by third parties. In our Other Portfolio, we may incur indirect fees and expenses in connection with investments managed by third parties, such as investments in other investment companies or private funds.

Historically, we have made LMM debt investments principally in the form of single tranche debt. Single tranche debt financing involves issuing one debt security that blends the risk and return profiles of both first lien secured and subordinated debt. We believe that single tranche debt is more appropriate for many LMM companies given their size in order to reduce structural complexity and potential conflicts among creditors.

Our LMM debt investments generally have a term of five to seven years from the original investment date, with limited required amortization prior to maturity, and provide for monthly or quarterly payment of interest at fixed interest rates generally between 10% and 14% per annum, payable currently in cash. In some instances, we have provided floating interest rates for our single tranche debt securities. In addition, certain LMM debt investments may have a form of interest that is not paid currently but is accrued and added to the loan balance and paid at maturity. We refer to this form of interest as payment-in-kind, or PIK, interest. We typically structure our LMM debt investments with the maximum seniority and collateral that we can reasonably obtain while seeking to achieve our total return target. In most cases, our LMM debt investment will be collateralized by a first priority lien on substantially all the assets of the portfolio company. In addition to seeking a senior lien position in the capital structure of our LMM portfolio companies, we seek to limit the downside potential of our LMM debt investments by negotiating covenants that are designed to protect our LMM debt investments while affording our portfolio companies as much flexibility in managing their businesses as is reasonable. Such restrictions may include affirmative and negative covenants, default penalties, lien protection, change of control or change of management provisions, key-man life insurance, guarantees, equity pledges, personal guaranties, where appropriate, and put rights. In addition, we typically seek board representation or observation rights in all of our LMM portfolio companies.

While we will continue to focus our LMM debt investments primarily on single tranche debt investments, we also anticipate structuring some of our debt investments as mezzanine loans. We anticipate that these mezzanine loans will be primarily junior secured or unsecured, subordinated loans that provide for relatively high fixed interest rates payable currently in cash that will provide us with significant interest income plus the additional opportunity for income and gains through PIK interest and equity warrants and other similar equity instruments issued in conjunction with these mezzanine loans. These loans typically will have interest-only payments in the early years, with amortization of principal deferred to the later years of the mezzanine loan term. Typically, our mezzanine loans will have maturities of three to five years. We will generally target fixed interest rates of 12% to 14%, payable currently in cash for our mezzanine loan investments with higher targeted total returns from equity warrants or PIK interest.

We also pursue debt investments in Middle Market companies. Our Middle Market portfolio investments primarily consist of direct investments or secondary purchases of interest-bearing debt securities in privately held companies based in the United States that are generally larger in size than the companies included in our LMM portfolio. Our Middle Market portfolio debt investments are generally secured by either a first or second priority lien on the assets of the portfolio company and typically have a term of between three and seven years from the original investment date. The debt investments in our Middle Market portfolio have rights and protections that are similar to those in our LMM debt investments, which may include affirmative

and negative covenants, default penalties, lien protection, change of control provisions, guarantees and equity pledges. The Middle Market debt investments generally have floating interest rates at the London Interbank Offered Rate ("LIBOR") plus a margin, and are typically subject to LIBOR floors.

Our Private Loan portfolio investments primarily consist of investments in interest-bearing debt securities in companies that are consistent with the size of companies in our LMM portfolio or our Middle Market portfolio, but are investments which have been originated through strategic relationships with other investment funds on a collaborative basis. Our Private Loan portfolio debt investments are generally secured by either a first or second priority lien and typically have a term of between three and seven years from the original investment date.

In connection with our debt investments, we occasionally receive equity warrants to establish or increase our equity interest in the portfolio company. Warrants we receive in connection with a debt investment typically require only a nominal cost to exercise, and thus, as a portfolio company appreciates in value, we may achieve additional investment return from this equity interest. We typically structure the warrants to provide provisions protecting our rights as a minority-interest holder, as well as secured or unsecured put rights, or rights to sell such securities back to the portfolio company, upon the occurrence of specified events. In certain cases, we also may obtain registration rights in connection with these equity interests, which may include demand and "piggyback" registration rights.

We also will seek to make direct equity investments in situations where it is appropriate to align our interests with key management and stockholders of our LMM portfolio companies, and to allow for participation in the appreciation in the equity values of our LMM portfolio companies. We usually make our direct equity investments in connection with debt investments in our LMM portfolio companies. In addition, we may have both equity warrants and direct equity positions in some of our LMM portfolio companies. We seek to maintain fully diluted equity positions in our LMM portfolio companies of 5% to 50%, and may have controlling equity interests in some instances. We have a value orientation toward our direct equity investments and have traditionally been able to purchase our equity investments at reasonable valuations.

Our investment committee is responsible for all aspects of our LMM investment process. The current members of our investment committee are Vincent D. Foster, our Chairman and Chief Executive Officer, Dwayne L. Hyzak, our President, Chief Operating Officer and Senior Managing Director, Curtis L. Hartman, our Vice-Chairman, Chief Credit Officer and Senior Managing Director, and David Magdol, our Vice-Chairman, Chief Investment Officer and Senior Managing Director.

Our credit committee is responsible for all aspects of our Middle Market portfolio investment process. The current members of our credit committee are Messrs. Foster, Hartman, Hyzak and Nicholas T. Meserve, the Managing Director of our Middle Market investment team.

Investment process responsibility for each Private Loan portfolio investment is delegated to either the investment committee or the credit committee based upon the nature of the investment and the manner in which it was originated. Similarly, the investment processes for each Private Loan portfolio investment, from origination to close and to eventual exit, will follow the processes for our LMM portfolio investments or our Middle Market portfolio investments as outlined below, or a combination thereof.

Our investment strategy involves a "team" approach, whereby potential transactions are screened by several members of our investment team before being presented to the investment committee or the credit

committee, as applicable. Our investment committee and credit committee each meet on an as needed basis depending on transaction volume. We generally categorize our investment process into seven distinct stages:

Deal generation and origination is maximized through long-standing and extensive relationships with industry contacts, brokers, commercial and investment bankers, entrepreneurs, service providers such as lawyers, financial advisors, accountants and current and former portfolio companies and investors. Our investment team has focused its deal generation and origination efforts on LMM and Middle Market companies, and we have developed a reputation as a knowledgeable, reliable and active source of capital and assistance in these markets.

During the screening process, if a transaction initially meets our investment criteria, we will perform preliminary due diligence, taking into consideration some or all of the following information:

Upon successful screening of a proposed LMM transaction, the investment team makes a recommendation to our investment committee. If our investment committee concurs with moving forward on the proposed LMM transaction, we typically issue a non-binding term sheet to the company. For Middle Market portfolio investments, the initial term sheet is typically issued by the borrower, through the syndicating bank, and is screened by the investment team which makes a recommendation to our credit committee.

For proposed LMM transactions, the non-binding term sheet will include the key economic terms based upon our analysis performed during the screening process as well as a proposed timeline and our qualitative expectation for the transaction. While the term sheet for LMM investments is non-binding, we typically receive an expense deposit in order to move the transaction to the due diligence phase. Upon execution of a term sheet, we begin our formal due diligence process.

For proposed Middle Market transactions, the initial term sheet will include key economic terms and other conditions proposed by the borrower and its representatives and the proposed timeline for the investment, which are reviewed by our investment team to determine if such terms and conditions are in agreement with our investment objectives.

Due diligence on a proposed LMM investment is performed by a minimum of two of our investment professionals, whom we refer to collectively as the investment team, and certain external resources, who together conduct due diligence to understand the relationships among the prospective portfolio company's business plan, operations and financial performance. Our LMM due diligence review includes some or all of the following:

Due diligence on a proposed Middle Market investment is generally performed on materials and information obtained from certain external resources and assessed internally by a minimum of two of our investment professionals, who work to understand the relationships among the prospective portfolio company's business plan, operations and financial performance using the accumulated due diligence information. Our Middle Market due diligence review includes some or all of the following:

During the due diligence process, significant attention is given to sensitivity analyses and how the company might be expected to perform given downside, base-case and upside scenarios. In certain cases, we may decide not to make an investment based on the results of the diligence process.

Upon completion of a satisfactory due diligence review of a proposed LMM portfolio investment, the investment team presents the findings and a recommendation to our investment committee. The presentation contains information which can include, but is not limited to, the following:

Upon completion of a satisfactory due diligence review of a proposed Middle Market portfolio investment, the investment team presents the findings and a recommendation to our credit committee. The presentation contains information which can include, but is not limited to, the following:

If any adjustments to the transaction terms or structures are proposed by the investment committee or credit committee, as applicable, such changes are made and applicable analyses are updated prior to approval of the transaction. Approval for the transaction must be made by the affirmative vote from a majority of the members of the investment committee or credit committee, as applicable, with the committee member managing the transaction, if any, abstaining from the vote. Upon receipt of transaction approval, we will re-confirm regulatory compliance, process and finalize all required legal documents, and fund the investment.

We continuously monitor the status and progress of the portfolio companies. We generally offer managerial assistance to our portfolio companies, giving them access to our investment experience, direct industry expertise and contacts. The same investment team that was involved in the investment process will continue its involvement in the portfolio company post-investment. This provides for continuity of knowledge and allows the investment team to maintain a strong business relationship with key management of our portfolio companies for post-investment assistance and monitoring purposes.

As part of the monitoring process of LMM portfolio investments, the investment team will analyze monthly and quarterly financial statements versus the previous periods and year, review financial projections, meet and discuss issues or opportunities with management, attend board meetings and review all compliance certificates and covenants. While we maintain limited involvement in the ordinary course operations of our LMM portfolio companies, we maintain a higher level of involvement in non-ordinary course financing or strategic activities and any non-performing scenarios. We also monitor the performance of our Middle Market portfolio investments; however, due to the larger size and higher sophistication level of these Middle Market companies in comparison to our LMM portfolio companies, it is not necessary or practical to have as much direct management interface.

We utilize an internally developed investment rating system to rate the performance of each LMM portfolio company and to monitor our expected level of returns on each of our LMM investments in relation to our expectations for the portfolio company. The investment rating system takes into consideration various factors, including, but not limited to, each investment's expected level of returns, the collectability of our debt investments and the ability to receive a return of the invested capital in our equity investments, comparisons to competitors and other industry participants, the portfolio company's future outlook and other factors that are deemed to be significant to the portfolio company.

While we generally exit most investments through the refinancing or repayment of our debt and redemption or sale of our equity positions, we typically assist our LMM portfolio companies in developing and planning exit opportunities, including any sale or merger of our portfolio companies. We may also assist in the structure, timing, execution and transition of the exit strategy. The refinancing or repayment of Middle Market debt investments typically does not require our assistance due to the additional resources available to these larger, Middle Market companies.

We determine the net asset value per share of our common stock on a quarterly basis. The net asset value per share is equal to our total assets minus liabilities and any noncontrolling interests outstanding divided by the total number of shares of common stock outstanding.

We are required to report our investments at fair value. As a result, the most significant determination inherent in the preparation of our consolidated financial statements is the valuation of our Investment Portfolio and the related amounts of unrealized appreciation and depreciation. We follow the provisions of the Financial Accounting Standards Board Accounting Standards Codification ("ASC") 820, Fair Value Measurements and Disclosures ("ASC 820"). ASC 820 defines fair value, establishes a framework for measuring fair value, establishes a fair value hierarchy based on the quality of inputs used to measure fair value, and enhances disclosure requirements for fair value measurements. ASC 820 requires us to assume that the portfolio investment is to be sold in the principal market to independent market participants, which may be a hypothetical market. Market participants are defined as buyers and sellers in the principal market that are independent, knowledgeable and willing and able to transact.

We determine in good faith the fair value of our Investment Portfolio pursuant to a valuation policy in accordance with ASC 820 and a valuation process approved by our Board of Directors and in accordance with the 1940 Act. Our valuation policies and processes are intended to provide a consistent basis for determining the fair value of our Investment Portfolio. See "Note B.1. — Valuation of the Investment Portfolio" in the notes to consolidated financial statements for a detailed discussion of our investment portfolio valuation process and procedures.

Due to the inherent uncertainty in the valuation process, our determination of fair value for our Investment Portfolio may differ materially from the values that would have been determined had a ready market for the securities existed. In addition, changes in the market environment, portfolio company performance and other events that may occur over the lives of the investments may cause the gains or losses ultimately realized on these investments to be materially different than the valuations currently assigned. We determine the fair value of each individual investment and record changes in fair value as unrealized appreciation or depreciation.

As described below, we undertake a multi-step valuation process each quarter in connection with determining the fair value of our investments, with our Board of Directors having final responsibility for overseeing, reviewing and approving, in good faith, our determination of the fair value for our Investment Portfolio and our valuation procedures, consistent with 1940 Act requirements. In addition, the Audit Committee of our Board of Directors periodically evaluates the performance and methodologies of the financial advisory services firm that we consult in connection with valuing our LMM and Private Loan portfolio company investments.

Determination of fair value involves subjective judgments and estimates. The notes to our consolidated financial statements refer to the uncertainty with respect to the possible effect of such valuations, and any change in such valuations, on our financial results and financial condition.

We compete for investments with a number of investment funds (including private equity funds, mezzanine funds, BDCs, and SBICs), as well as traditional financial services companies such as commercial banks and other sources of financing. Many of the entities that compete with us are larger and have more resources available to them. We believe we are able to be competitive with these entities primarily on the basis of our focus toward the underserved LMM, the experience and contacts of our management team, our responsive and efficient investment analysis and decision-making processes, our comprehensive suite of customized financing solutions and the investment terms we offer.

We believe that some of our competitors make senior secured loans, junior secured loans and subordinated debt investments with interest rates and returns that are comparable to or lower than the rates and returns that we target. Therefore, we do not seek to compete primarily on the interest rates and returns that we offer to potential portfolio companies. For additional information concerning the competitive risks we face, see "Risk Factors — Risks Related to Our Business and Structure — We may face increasing competition for investment opportunities."

As of December 31, 2017, we had 58 employees. These employees include investment and portfolio management professionals, operations professionals and administrative staff. As necessary, we will hire

additional investment professionals and administrative personnel. All of our employees are located in our Houston, Texas office.

We have elected to be regulated as a BDC under the 1940 Act. The 1940 Act contains prohibitions and restrictions relating to transactions between BDCs and their affiliates, principal underwriters and affiliates of those affiliates or underwriters. The 1940 Act requires that a majority of the members of the board of directors of a BDC be persons other than "interested persons," as that term is defined in the 1940 Act. In addition, the 1940 Act provides that we may not change the nature of our business so as to cease to be, or to withdraw our election as, a BDC unless approved by a majority of our outstanding voting securities.

The 1940 Act defines "a majority of the outstanding voting securities" as the lesser of (i) 67% or more of the voting securities present at a meeting if the holders of more than 50% of our outstanding voting securities are present or represented by proxy or (ii) more than 50% of our outstanding voting securities.

Under the 1940 Act, a BDC may not acquire any asset other than assets of the type listed in Section 55(a) of the 1940 Act, which are referred to as qualifying assets, unless, at the time the acquisition is made, qualifying assets represent at least 70% of the company's total assets. The principal categories of qualifying assets relevant to our business are any of the following:

In addition, a BDC must have been organized and have its principal place of business in the United States and must be operated for the purpose of making investments in the types of securities described in (1), (2) or (3) above.

As noted above, a BDC must be operated for the purpose of making investments in the type of securities described in (1), (2) or (3) above under the heading entitled "— Qualifying Assets." In addition, BDCs must generally offer to make available to such issuer of the securities (other than small and solvent companies described above) significant managerial assistance; except that, where we purchase such securities in conjunction with one or more other persons acting together, one of the other persons in the group may make available such managerial assistance. Making available managerial assistance means, among other things, any arrangement whereby the BDC, through its directors, officers or employees, offers to provide, and, if accepted, does so provide, significant guidance and counsel concerning the management, operations or business objectives and policies of a portfolio company.

Pending investment in "qualifying assets," as described above, our investments may consist of cash, cash equivalents, U.S. government securities and high-quality debt securities maturing in one year or less from time of investment therein, so that 70% of our assets are qualifying assets.

We are permitted, under specified conditions, to issue multiple classes of debt and one class of stock senior to our common stock if our asset coverage, as defined in the 1940 Act, is at least equal to 200% of all debt and/or senior stock immediately after each such issuance. In addition, while any senior securities remain outstanding (other than senior securities representing indebtedness issued in consideration of a privately arranged loan which is not intended to be publicly distributed), we must make provisions to prohibit any distribution to our stockholders or the repurchase of such securities or shares unless we meet the applicable asset coverage ratios at the time of the distribution or repurchase. We may also borrow amounts up to 5% of the value of our total assets for temporary or emergency purposes without regard to asset coverage. For a discussion of the risks associated with leverage, see "Risk Factors — Risks Relating to Our Business and Structure," including, without limitation, "— Because we borrow money, the potential for gain or loss on amounts invested in us is magnified and may increase the risk of investing in us."

We have previously received an exemptive order from the SEC to exclude debt securities issued by MSMF and any other wholly owned subsidiaries of ours which operate as SBICs from the asset coverage requirements of the 1940 Act as applicable to Main Street. The exemptive order provides for the exclusion of all debt securities issued by the Funds, including the $295.8 million of outstanding debt as of December 31, 2017, issued pursuant to the SBIC program. This exemptive order provides us with expanded capacity and flexibility in obtaining future sources of capital for our investment and operational objectives.

We are not generally able to issue and sell our common stock at a price below net asset value per share. We may, however, sell our common stock, warrants, options or rights to acquire our common stock, at a price below the current net asset value of the common stock if our Board of Directors determines that such sale is in our best interests and that of our stockholders, and our stockholders approve such sale. In any such case, the price at which our securities are to be issued and sold may not be less than a price which, in the determination of our Board of Directors, closely approximates the market value of such securities (less any distributing commission or discount). We did not seek stockholder authorization to sell shares of our common stock below the then current net asset value per share of our common stock at our 2017 annual meeting of stockholders because our common stock price had been trading significantly above the net asset value per share of our common stock since 2011. Our stockholders have previously approved a proposal that authorizes us to issue securities to subscribe to, convert to, or purchase shares of our common stock in one or more offerings. We may also make rights offerings to our stockholders at prices per share less than the net asset value per share, subject to applicable requirements of the 1940 Act. See "Risk Factors — Risks Relating to Our Business and Structure — Stockholders may incur dilution if we sell shares of our common stock in one or more offerings at prices below the then current net asset value per share of our common stock or issue securities to subscribe to, convert to or purchase shares of our common stock."

We have adopted a code of ethics pursuant to Rule 17j-1 under the 1940 Act that establishes procedures for personal investments and restricts certain personal securities transactions. Personnel subject to the code may invest in securities for their personal investment accounts, including securities that may be purchased or held by us, so long as such investments are made in accordance with the code's requirements. You may read and copy the code of ethics at the SEC's Public Reference Room located at 100 F Street, NE, Washington, DC 20549. You may obtain information on the operation of the Public Reference Room by calling the SEC at 1-800-SEC-0330. In addition, the code of ethics is available on the EDGAR Database on the SEC's Web site at http://www.sec.gov.

We vote proxies relating to our portfolio securities in a manner in which we believe is consistent with the best interest of our stockholders. We review on a case-by-case basis each proposal submitted to a stockholder vote to determine its impact on the portfolio securities held by us. Although we generally vote against proposals that we expect would have a negative impact on our portfolio securities, we may vote for such a proposal if there exists compelling long-term reasons to do so.

Our proxy voting decisions are made by the investment team which is responsible for monitoring each of our investments. To ensure that our vote is not the product of a conflict of interest, we require that anyone involved in the decision-making process discloses to our chief compliance officer any potential conflict regarding a proxy vote of which he or she is aware.

Stockholders may obtain information, without charge, regarding how we voted proxies with respect to our portfolio securities by making a written request for proxy voting information to: Chief Compliance Officer, 1300 Post Oak Boulevard, 8th Floor, Houston, Texas 77056.

We are also prohibited under the 1940 Act from knowingly participating in certain transactions with our affiliates without the prior approval of our Board of Directors who are not interested persons and, in some cases, prior approval by the SEC.

We are required to provide and maintain a bond issued by a reputable fidelity insurance company to protect us against larceny and embezzlement. Furthermore, as a BDC, we are prohibited from protecting any

director or officer against any liability to us or our stockholders arising from willful misfeasance, bad faith, gross negligence or reckless disregard of the duties involved in the conduct of such person's office.

We are required to adopt and implement written policies and procedures reasonably designed to prevent violation of the federal securities laws, review these policies and procedures no less frequently than annually for their adequacy and the effectiveness of their implementation, and to designate a chief compliance officer to be responsible for administering the policies and procedures.

Each of the Funds is licensed by the SBA to operate as a SBIC under Section 301(c) of the Small Business Investment Act of 1958. MSMF obtained its SBIC license in 2002, MSC II obtained its license in 2006 and MSC III obtained its license in 2016.

SBICs are designed to stimulate the flow of private capital to eligible small businesses. Under SBIC regulations, SBICs may make loans to eligible small businesses, invest in the equity securities of such businesses and provide them with consulting and advisory services. Each of the Funds has typically invested in secured debt, acquired warrants and/or made equity investments in qualifying small businesses.

The Funds are subject to regulation and oversight by the SBA, including requirements with respect to reporting financial information, such as the extent of capital impairment if applicable, on a regular basis and annual examinations conducted by the SBA. The SBA, as a creditor, will have a superior claim to the Funds' assets over our stockholders in the event the Funds are liquidated or the SBA exercises its remedies under the SBA-guaranteed debentures issued by the Funds upon an event of default.

We have received exemptive relief from the SEC to permit us to exclude the SBA-guaranteed debentures of the Funds from our 200% asset coverage test under the 1940 Act. As such, our ratio of total consolidated assets to outstanding indebtedness may be less than 200%. This provides us with increased investment flexibility but also increases our risks related to leverage. See "Item 1A. Risk Factors — Risks related to our business and structure — Because we borrow money, the potential for gain or loss on amounts invested in us is magnified and may increase the risk of investing in us."

Under present SBIC regulations, eligible small businesses generally include businesses that (together with their affiliates) have a tangible net worth not exceeding $19.5 million or have average annual net income after U.S. federal income taxes not exceeding $6.5 million (average net income to be computed without benefit of any carryover loss) for the two most recent fiscal years. In addition, an SBIC must devote 25% of its investment activity to "smaller" enterprises as defined by the SBA. A smaller enterprise generally includes businesses that have a tangible net worth not exceeding $6 million and have average annual net income after U.S. federal income taxes not exceeding $2 million (average net income to be computed without benefit of any net carryover loss) for the two most recent fiscal years. SBIC regulations also provide alternative size standard criteria to determine eligibility for designation as an eligible small business or smaller enterprise, which criteria depend on the primary industry in which the business is engaged and are based on such factors as the number of employees and gross revenue. However, once an SBIC has invested in a company, it generally may continue to make follow-on investments in the company, regardless of the size of the portfolio company at the time of the follow-on investment, up to the time of the portfolio company's initial public offering.

The SBA prohibits an SBIC from providing funds to small businesses for certain purposes, such as relending and investment outside the United States, to businesses engaged in certain prohibited industries, and to certain "passive" (non-operating) companies. In addition, without prior SBA approval, an SBIC may not invest an amount equal to more than approximately 30% of the SBIC's regulatory capital, as defined by the SBA, in any one portfolio company and its affiliates.

The SBA places certain limitations on the financing terms of investments by SBICs in portfolio companies (such as limiting the permissible interest rate on debt securities held by an SBIC in a portfolio company). Included in such limitations are SBA regulations which allow an SBIC to exercise control over a small business for a period of seven years from the date on which the SBIC initially acquires its control position. This control period may be extended for an additional period of time with the SBA's prior written approval.

The SBA restricts the ability of an SBIC to lend money to any of its officers, directors and employees or to invest in affiliates thereof. The SBA also prohibits, without prior SBA approval, a "change of control" of an SBIC or transfers that would result in any person (or a group of persons acting in concert) owning 10% or more of a class of equity of a licensed SBIC. A "change of control" is any event which would result in the transfer of the power, direct or indirect, to direct the management and policies of an SBIC, whether through ownership, contractual arrangements or otherwise.

The SBIC licenses allow the Funds to incur leverage by issuing SBA-guaranteed debentures, subject to the issuance of a capital commitment and certain approvals by the SBA and customary procedures. SBA-guaranteed debentures carry long-term fixed rates that are generally lower than rates on comparable bank and other debt. Under applicable regulations, an SBIC may generally have outstanding debentures guaranteed by the SBA in amounts up to twice the amount of the privately-raised funds of the SBIC. Debentures guaranteed by the SBA have a maturity of ten years, require semiannual payments of interest, do not require any principal payments prior to maturity, and are not subject to prepayment penalties. As of December 31, 2017, we, through the Funds, had $295.8 million of outstanding SBA-guaranteed debentures, which had an annual weighted-average interest rate of approximately 3.6%.

SBICs must invest idle funds that are not being used to make loans in investments permitted under SBIC regulations in the following limited types of securities: (i) direct obligations of, or obligations guaranteed as to principal and interest by, the United States government, which mature within 15 months from the date of the investment; (ii) repurchase agreements with federally insured institutions with a maturity of seven days or less (and the securities underlying the repurchase obligations must be direct obligations of or guaranteed by the federal government); (iii) certificates of deposit with a maturity of one year or less, issued by a federally insured institution; (iv) a deposit account in a federally insured institution that is subject to a withdrawal restriction of one year or less; (v) a checking account in a federally insured institution; or (vi) a reasonable petty cash fund.

SBICs are periodically examined and audited by the SBA's staff to determine their compliance with SBIC regulations and are periodically required to file certain financial information and other documents with the SBA.

Neither the SBA nor the U.S. government or any of its agencies or officers has approved any ownership interest to be issued by us or any obligation that we or any of our subsidiaries may incur.

We are subject to the reporting and disclosure requirements of the Securities Exchange Act of 1934 (the "Exchange Act"), including the filing of quarterly, annual and current reports, proxy statements and other required items. In addition, we are subject to the Sarbanes-Oxley Act of 2002, which imposes a wide variety of regulatory requirements on publicly-held companies and their insiders. For example:

The New York Stock Exchange ("NYSE") has adopted corporate governance regulations that listed companies must comply with. We believe we are in compliance with such corporate governance listing standards. We intend to monitor our compliance with all future listing standards and to take all necessary actions to ensure that we stay in compliance.

The External Investment Manager, which is wholly owned by us, is subject to regulation under the Advisers Act. The Advisers Act establishes, among other things, recordkeeping and reporting requirements, disclosure requirements, limitations on transactions between the adviser's account and an advisory client's account, limitations on transactions between the accounts of advisory clients, and general anti-fraud prohibitions. The External Investment Manager may be examined by the SEC from time to time for compliance with the Advisers Act.

MSCC has elected to be treated for U.S. federal income tax purposes as a RIC under Subchapter M of the Code. MSCC's taxable income includes the taxable income generated by MSCC and certain of its subsidiaries, including the Funds, which are treated as disregarded entities for tax purposes. As a RIC, we generally will not pay corporate-level U.S. federal income taxes on any income that we distribute to our stockholders as dividends. To qualify as a RIC, we must, among other things, meet certain source-of-income and asset diversification requirements (as described below). In addition, in order to obtain RIC tax treatment, we must distribute to our stockholders, for each taxable year, at least 90% of our "investment company taxable income," which is generally our net ordinary taxable income plus the excess of realized net short-term capital gains over realized net long-term capital losses, and 90% of our tax-exempt income (the "Annual Distribution Requirement"). As part of maintaining RIC status, undistributed taxable income (subject to a 4% non-deductible U.S. federal excise tax) pertaining to a given fiscal year may be distributed up to 12 months subsequent to the end of that fiscal year, provided such dividends are declared on or prior to the later of (i) filing of the U.S. federal income tax return for the applicable fiscal year or (ii) the fifteenth day of the ninth month following the close of the year in which such taxable income was generated.

For any taxable year in which we qualify as a RIC and satisfy the Annual Distribution Requirement, we will not be subject to U.S. federal income tax on the portion of our income or capital gains we distribute (or are deemed to distribute) to stockholders. We will be subject to U.S. federal income tax at the regular corporate rates on any income or capital gains not distributed (or deemed distributed) to our stockholders.

We are subject to a 4% non-deductible U.S. federal excise tax on certain undistributed income unless we distribute in a timely manner an amount at least equal to the sum of (1) 98% of our net ordinary taxable income for each calendar year, (2) 98.2% of our capital gain net income for the one-year period ending December 31 in that calendar year and (3) any taxable income recognized, but not distributed, in preceding years on which we paid no U.S. federal income tax (the "Excise Tax Avoidance Requirement"). Dividends declared and paid by us in a year will generally differ from taxable income for that year as such dividends may include the distribution of current year taxable income, exclude amounts carried over into the following year, and include the distribution of prior year taxable income carried over into and distributed in the current

year. For amounts we carry over into the following year, we will be required to pay the 4% U.S. federal excise tax based on 98% of our annual taxable income and 98.2% of our capital gain net income in excess of distributions for the year.

In order to qualify as a RIC for U.S. federal income tax purposes, we must, among other things:

In order to comply with the 90% Income Test, we formed the Taxable Subsidiaries as wholly owned taxable subsidiaries for the primary purpose of permitting us to own equity interests in portfolio companies which are "pass-through" entities for tax purposes. Absent the taxable status of the Taxable Subsidiaries, a portion of the gross income from such portfolio companies would flow directly to us for purposes of the 90% Income Test. To the extent such income did not consist of income derived from securities, such as dividends and interest, it could jeopardize our ability to qualify as a RIC and, therefore, cause us to incur significant U.S. federal income taxes. The Taxable Subsidiaries are consolidated with Main Street for generally accepted accounting principles in the United States of America ("U.S. GAAP") purposes and are included in our consolidated financial statements, and the portfolio investments held by the Taxable Subsidiaries are included in our consolidated financial statements. The Taxable Subsidiaries are not consolidated with Main Street for income tax purposes and may generate income tax expense, or benefit, as a result of their ownership of the portfolio investments. The income tax expense, or benefit, if any, and any related tax assets and liabilities, are reflected in our consolidated financial statements.

The External Investment Manager is accounted for as a portfolio investment for U.S. GAAP purposes and is an indirect wholly owned subsidiary of MSCC owned through a Taxable Subsidiary. The External Investment Manager is owned by a Taxable Subsidiary in order to comply with the 90% Income Test, since the External Investment Manager's income would likely not consist of income derived from securities, such as dividends and interest, and as result, it could jeopardize our ability to qualify as a RIC and, therefore, cause us to incur significant U.S. federal income taxes. As a result of its ownership by a Taxable Subsidiary, the External Investment Manager is a disregarded entity for tax purposes. The External Investment Manager has also entered into a tax sharing agreement with its Taxable Subsidiary owner. Since the External Investment Manager is accounted for as a portfolio investment of MSCC and is not included as a consolidated subsidiary of MSCC in MSCC's consolidated financial statements, and as a result of the tax sharing agreement with its Taxable Subsidiary owner, for its stand-alone financial reporting purposes the External Investment Manager is treated as if it is taxed at normal corporate tax rates based on its taxable income and, as a result of its activities, may generate income tax expense or benefit. The income tax expense, or benefit, if any, and the related tax assets and liabilities, of the External Investment Manager are reflected in the External Investment Manager's separate financial statements.

We may be required to recognize taxable income in circumstances in which we do not receive cash. For example, if we hold debt obligations that are treated under applicable tax rules as having original issue discount (such as debt instruments issued with warrants and debt securities invested in at a discount to par), we must include in income each year a portion of the original issue discount that accrues over the life of the obligation, regardless of whether cash representing such income is received by us in the same taxable year. We may also have to include in income other amounts that we have not yet received in cash such as PIK interest, cumulative dividends or amounts that are received in non-cash compensation such as warrants or stock. Because any original issue discount or other amounts accrued will be included in our investment company taxable income for the year of accrual, we may be required to make a distribution to our stockholders in order to satisfy the Annual Distribution Requirement, even though we will not have received any corresponding cash amount.

Although we do not presently expect to do so, we are authorized to borrow funds and to sell assets in order to satisfy distribution requirements. However, under the 1940 Act, we are not permitted to make distributions to our stockholders in certain circumstances while our debt obligations and other senior securities are outstanding unless certain "asset coverage" tests are met. See "Regulation — Regulation as a Business Development Company — Senior Securities." Moreover, our ability to dispose of assets to meet our distribution requirements may be limited by (1) the illiquid nature of our portfolio and/or (2) other requirements relating to our status as a RIC, including the Diversification Tests. If we dispose of assets in order to meet the Annual Distribution Requirement or the Excise Tax Avoidance Requirement, we may make such dispositions at times that, from an investment standpoint, are not advantageous.

We may distribute taxable dividends that are payable in part in our stock. Under certain applicable provisions of the Code and the U.S. Department of Treasury ("Treasury") regulations, distributions payable by us in cash or in shares of stock (at the stockholders election) would satisfy the Annual Distribution Requirement. The Internal Revenue Service has issued guidance indicating that this rule will apply even where the total amount of cash that may be distributed is limited to no more than 20% of the total distribution. According to this guidance, if too many stockholders elect to receive their distributions in cash, each such stockholder would receive a pro rata share of the total cash to be distributed and would receive the remainder of their distribution in shares of stock. Taxable stockholders receiving such dividends will be required to include the full amount of the dividend (whether received in cash, our stock, or a combination thereof) as (i) ordinary income (including any qualified dividend income that, in the case of a noncorporate stockholder, may be eligible for the same reduced maximum tax rate applicable to long-term capital gains to the extent such distribution is properly reported by us as qualified dividend income and such stockholder satisfies certain minimum holding period requirements with respect to our stock) or (ii) long-term capital gain (to the extent such distribution is properly reported as a capital gain dividend), to the extent of our current and accumulated earnings and profits for U.S. federal income tax purposes. As a result, a U.S. stockholder may be required to pay tax with respect to such dividends in excess of any cash received. If a U.S. stockholder sells the stock it receives in order to pay this tax, the sales proceeds may be less than the amount included in income with respect to the dividend, depending on the market price of our stock at the time of the sale. Furthermore, with respect to non-U.S. stockholders, we may be required to withhold U.S. tax with respect to such dividends, including in respect of all or a portion of such dividend that is payable in stock. In addition, if a significant number of our stockholders determine to sell shares of our stock in order to pay taxes owed on dividends, it may put downward pressure on the trading price of our stock.

If we fail to satisfy the 90% Income Test or the Diversification Tests for any taxable year, we may nevertheless continue to qualify as a RIC for such year if certain relief provisions are applicable (which may, among other things, require us to pay certain corporate-level U.S. federal taxes or to dispose of certain assets).

If we were unable to qualify for treatment as a RIC and the foregoing relief provisions are not applicable, we would be subject to tax on all of our taxable income at regular corporate rates. We would not be able to

deduct distributions to stockholders, nor would they be required to be made. If we were subject to tax on all of our taxable income at regular corporate rates, then distributions we make after being subject to such tax would be taxable to our stockholders and, provided certain holding period and other requirements were met, could qualify for treatment as "qualified dividend income" eligible for the maximum 20% rate (plus a 3.8% Medicare surtax, if applicable) applicable to qualified dividends to the extent of our current and accumulated earnings and profits. Subject to certain limitations under the Code, corporate taxpayers would be eligible for a dividends-received deduction on distributions they receive. Distributions in excess of our current and accumulated earnings and profits would be treated first as a return of capital to the extent of the stockholder's tax basis, and any remaining distributions would be treated as a capital gain. To requalify as a RIC in a subsequent taxable year, we would be required to satisfy the RIC qualification requirements for that year and dispose of any earnings and profits from any year in which we failed to qualify as a RIC. Subject to a limited exception applicable to RICs that qualified as such under Subchapter M of the Code for at least one year prior to disqualification and that requalify as a RIC no later than the second year following the nonqualifying year, we could be subject to tax on any unrealized net built-in gains in the assets held by us during the period in which we failed to qualify as a RIC that are recognized within the subsequent five years, unless we made a special election to pay corporate-level U.S. federal income tax on such built-in gain at the time of our requalification as a RIC.

Investing in our securities involves a number of significant risks. In addition to the other information contained in this Annual Report on Form 10-K, you should consider carefully the following information before making an investment in our securities. The risks set out below are not the only risks we face. Additional risks and uncertainties not presently known to us or not presently deemed material by us might also impair our operations and performance. If any of the following events occur, our business, financial condition and results of operations could be materially and adversely affected. In such case, our net asset value, the trading price of our common stock and the value of our other securities could decline, and you may lose all or part of your investment.

The broader fundamentals of the United States economy remain mixed. In the event that the United States economy contracts, it is likely that the financial results of small to mid-sized companies, like those in which we invest, could experience deterioration or limited growth from current levels, which could ultimately lead to difficulty in meeting their debt service requirements and an increase in defaults. In addition, a decline in oil and natural gas prices would adversely affect the credit quality of our debt investments and the underlying operating performance of our equity investments in energy-related businesses. Consequently, we can provide no assurance that the performance of certain portfolio companies will not be negatively impacted by economic cycles, industry cycles or other conditions, which could also have a negative impact on our future results.

Although we have been able to secure access to additional liquidity, including through the Credit Facility, public debt issuances, leverage available through the SBIC program and equity offerings, the potential for volatility in the debt and equity capital markets provides no assurance that debt or equity capital will be available to us in the future on favorable terms, or at all. Further, if the price of our common stock falls below our net asset value per share, we will be limited in our ability to sell new shares if we do not have stockholder authorization to sell shares at a price below net asset value per share. We did not seek stockholder authorization to sell shares of our common stock below the then current net asset value per share

of our common stock at our 2017 annual meeting of stockholders because our common stock price had been trading significantly above the net asset value per share of our common stock since 2011.

Under the 1940 Act, we are required to carry our portfolio investments at market value or, if there is no readily available market value, at fair value as determined by us with our Board of Directors having final responsibility for overseeing, reviewing and approving, in good faith, our determination of fair value and our valuation procedures. Typically, there is not a public market for the securities of the privately held LMM or Private Loan companies in which we have invested and will generally continue to invest. As a result, we value these securities quarterly at fair value based on inputs from management, a nationally recognized independent financial advisory services firm (on a rotational basis) and our audit committee with the oversight, review and approval of our Board of Directors. In addition, the market for investments in Middle Market companies is generally not a liquid market, and therefore, we primarily use a combination of observable inputs in non-active markets for which sufficient observable inputs were not available to determine the fair value of these investments and unobservable inputs, which are reviewed by our audit committee with the oversight, review and approval of our Board of Directors. See "Note B.1. — Valuation of the Investment Portfolio" in the notes to consolidated financial statements for a detailed discussion of our investment portfolio valuation process and procedures.

The determination of fair value and consequently, the amount of unrealized gains and losses in our portfolio, are to a certain degree, subjective and dependent on a valuation process approved by our Board of Directors. Certain factors that may be considered in determining the fair value of our investments include external events, such as private mergers, sales and acquisitions involving comparable companies. Because such valuations, and particularly valuations of private securities and private companies, are inherently uncertain, may fluctuate over short periods of time and may be based on estimates, our determinations of fair value may differ materially from the values that would have been used if a ready market for these securities existed. Due to this uncertainty, our fair value determinations may cause our net asset value on a given date to materially understate or overstate the value that we may ultimately realize on one or more of our investments. As a result, investors purchasing our securities based on an overstated net asset value would pay a higher price than the value of our investments might warrant. Conversely, investors selling our securities during a period in which the net asset value understates the value of our investments may receive a lower price for their securities than the value of our investments might warrant.

Our ability to achieve our investment objective of maximizing our portfolio's total return by generating current income from our debt investments and capital appreciation from our equity and equity-related investments, including warrants, convertible securities and other rights to acquire equity securities in a portfolio company, depends on our ability to effectively manage and deploy capital, which depends, in turn, on our investment team's ability to identify, evaluate and monitor, and our ability to finance and invest in, companies that meet our investment criteria.

Accomplishing our investment objective on a cost-effective basis is largely a function of our investment team's handling of the investment process, its ability to provide competent, attentive and efficient services and our access to investments offering acceptable terms. In addition to monitoring the performance of our existing investments, members of our investment team are also called upon, from time to time, to provide managerial

assistance to some of our portfolio companies. These demands on their time may distract them or slow the rate of investment.

Even if we are able to grow and build upon our investment operations, any failure to manage our growth effectively could have a material adverse effect on our business, financial condition, results of operations and prospects. The results of our operations will depend on many factors, including the availability of opportunities for investment, readily accessible short and long-term funding alternatives in the financial markets and economic conditions. Furthermore, if we cannot successfully operate our business or implement our investment policies and strategies as described herein, it could negatively impact our ability to pay dividends.

We compete for investments with other investment funds (including private equity funds, debt funds, mezzanine funds, collateralized loan obligation funds, or CLOs, BDCs, and SBICs), as well as traditional financial services companies such as commercial banks and other sources of funding. Many of our competitors are substantially larger and have considerably greater financial, technical and marketing resources than we do. For example, some competitors may have a lower cost of capital and access to funding sources that are not available to us. In addition, some of our competitors may have higher risk tolerances or different risk assessments than we have. These characteristics could allow our competitors to consider a wider variety of investments, establish more relationships and offer better pricing and more flexible structuring than we are able to do. We may lose investment opportunities if we do not match our competitors' pricing, terms and structure. If we are forced to match our competitors' pricing, terms and structure, we may not be able to achieve acceptable returns on our investments or may bear substantial risk of capital loss. A significant part of our competitive advantage stems from the fact that the market for investments in LMM companies is underserved by traditional commercial banks and other financing sources. A significant increase in the number and/or the size of our competitors in this target market could force us to accept less attractive investment terms. Furthermore, many of our competitors are not subject to the regulatory restrictions that the 1940 Act imposes on us as a BDC.

We depend on the members of our investment team, particularly Vincent D. Foster, Dwayne L. Hyzak, Curtis L. Hartman, David L. Magdol, K. Colton Braud, III, Alejandro Capetillo, and Nicholas T. Meserve for the identification, review, final selection, structuring, closing and monitoring of our investments. These employees have significant investment expertise and relationships that we rely on to implement our business plan. Although we have entered into a non-compete agreement with Mr. Foster, we have no guarantee that he or any other employees will remain employed with us. If we lose the services of these individuals, we may not be able to operate our business as we expect, and our ability to compete could be harmed, which could cause our operating results to suffer.

Our growth will require that we retain new investment and administrative personnel in a competitive market. Our ability to attract and retain personnel with the requisite credentials, experience and skills depends on several factors including, but not limited to, our ability to offer competitive wages, benefits and professional growth opportunities. Many of the entities, including investment funds (such as private equity funds, debt funds and mezzanine funds) and traditional financial services companies, with which we compete for experienced personnel have greater resources than we have.

The competitive environment for qualified personnel may require us to take certain measures to ensure that we are able to attract and retain experienced personnel. Such measures may include increasing the attractiveness of our overall compensation packages, altering the structure of our compensation packages

through the use of additional forms of compensation, or other steps. The inability to attract and retain experienced personnel would have a material adverse effect on our business.

We expect that members of our management team will maintain their relationships with intermediaries, financial institutions, investment bankers, commercial bankers, financial advisors, attorneys, accountants, consultants and other individuals within our network, and we will rely to a significant extent upon these relationships to provide us with potential investment opportunities. If our management team fails to maintain its existing relationships or develop new relationships with sources of investment opportunities, we will not be able to grow our Investment Portfolio. In addition, individuals with whom members of our management team have relationships are not obligated to provide us with investment opportunities, and, therefore, there is no assurance that such relationships will generate investment opportunities for us.

Our executive officers and employees, through the External Investment Manager, may manage other investment funds that operate in the same or a related line of business as we do. Accordingly, they may have obligations to such other entities, the fulfillment of which obligations may not be in the best interests of us or our stockholders. During May 2012, we entered into an investment sub-advisory agreement with HMS Adviser, which is the investment advisor to HMS Income, a non-listed BDC, to provide certain investment advisory services to HMS Adviser. In December 2013, after obtaining required no-action relief from the SEC to allow us to own a registered investment adviser, we assigned the sub-advisory agreement to the External Investment Manager since the fees received from such arrangement could otherwise have negative consequences on our ability to meet the source-of-income requirement necessary for us to maintain our RIC tax treatment. Under the investment sub-advisory agreement, the External Investment Manager is entitled to 50% of the base management fee and the incentive fees earned by HMS Adviser under its advisory agreement with HMS Income. The sub-advisory relationship requires us to commit resources to achieving HMS Income's investment objective, while such resources were previously solely devoted to achieving our investment objective. Our investment objective and investment strategies are very similar to those of HMS Income and it is likely that an investment appropriate for us or HMS Income would be appropriate for the other entity. As a result, we and HMS Income requested an exemptive order from the SEC permitting co-investments by us and HMS Income in certain negotiated transactions where our co-investing would otherwise be prohibited under the 1940 Act. The SEC granted the exemptive order in April 2014, and we have made, and in the future intend to continue to make, such co-investments with HMS Income in accordance with the conditions of the order. The order requires, among other things, that we and the External Investment Manager consider whether each such investment opportunity is appropriate for HMS Income and, if it is appropriate, to propose an allocation of the investment opportunity between us and HMS Income. As a consequence, it may be more difficult for us to maintain or increase the size of our Investment Portfolio in the future. Although we will endeavor to allocate investment opportunities in a fair and equitable manner, including in accordance with the conditions set forth in the exemptive order issued by the SEC when relying on such order, we may face conflicts in allocating investment opportunities between us and HMS Income. Because the External Investment Manager may receive performance-based fee compensation from HMS Income, this may provide an incentive to allocate opportunities to HMS Income instead of us. We have implemented an allocation policy to ensure the equitable distribution of investment opportunities and, as a result, may be unable to participate in certain investments based upon such allocation policy.

Our business will require capital to operate and grow. We may acquire such additional capital from the following sources:

The Funds, our wholly owned subsidiaries, are licensed to act as SBICs and are regulated by the SBA. The SBA also places certain limitations on the financing terms of investments by SBICs in portfolio companies and prohibits SBICs from providing funds for certain purposes or to businesses in a few prohibited industries. Compliance with SBA requirements may cause the Funds to forego attractive investment opportunities that are not permitted under SBA regulations.

Further, the SBA regulations require, among other things, that a licensed SBIC be periodically examined by the SBA and audited by an independent auditor, in each case to determine the SBIC's compliance with the relevant SBA regulations. The SBA prohibits, without prior SBA approval, a "change of control" of an SBIC or transfers that would result in any person (or a group of persons acting in concert) owning 10% or more of a class of capital stock of a licensed SBIC. If the Funds fail to comply with applicable SBIC regulations, the SBA could, depending on the severity of the violation, limit or prohibit their use of SBIC debentures, declare outstanding SBIC debentures immediately due and payable, and/or limit them from making new investments. In addition, the SBA can revoke or suspend a license for willful or repeated violation of, or willful or repeated failure to observe, any provision of the Small Business Investment Act of 1958 or any rule or regulation promulgated thereunder. Such actions by the SBA would, in turn, negatively affect us.

Borrowings, also known as leverage, magnify the potential for loss on investments in our indebtedness and gain or loss on investments in our equity capital. As we use leverage to partially finance our investments, you will experience increased risks of investing in our securities. We, through the Funds, issue debt securities guaranteed by the SBA and sold in the capital markets. As a result of its guarantee of the debt securities, the SBA has fixed dollar claims on the assets of the Funds that are superior to the claims of our securities holders. We may also borrow from banks and other lenders, including under our Credit Facility, and may issue debt securities or enter into other types of borrowing arrangements in the future. See "Management's Discussion and Analysis of Financial Condition and Results of Operations — Capital Resources" for a discussion regarding our outstanding indebtedness. If the value of our assets decreases, leveraging would cause net asset value to decline more sharply than it otherwise would have had we not leveraged our business. Similarly, any decrease in our income would cause net investment income to decline more sharply than it would have had we not leveraged our business. Such a decline could negatively affect our ability to pay common stock dividends, scheduled debt payments or other payments related to our securities. Use of leverage is generally considered a speculative investment technique.

As of December 31, 2017, we, through the Funds, had $295.8 million of outstanding indebtedness guaranteed by the SBA, which had a weighted-average annualized interest cost of approximately 3.6%. The debentures guaranteed by the SBA have a maturity of ten years, with a current weighted-average remaining maturity of 5.8 years as of December 31, 2017, and require semiannual payments of interest. We will need to generate sufficient cash flow to make required interest payments on the debentures. If we are unable to meet the financial obligations under the debentures, the SBA, as a creditor, will have a superior claim to the assets of the Funds over our securities holders in the event we liquidate or the SBA exercises its remedies under such debentures as the result of a default by us.

In addition, as of December 31, 2017, we had $64.0 million outstanding under our Credit Facility. Borrowings under the Credit Facility bear interest, subject to our election, on a per annum basis at a rate equal to the applicable LIBOR rate (1.56% as of December 31, 2017) plus (i) 1.875% (or the applicable base rate (Prime Rate of 4.50% as of December 31, 2017) plus 0.875%), as long as we maintain an investment grade rating and meet certain agreed upon excess collateral and maximum leverage requirements, (ii) 2.0% (or the applicable base rate plus 1.0%) if we maintain an investment grade rating but do not meet certain excess collateral and maximum leverage requirements or (iii) 2.25% (or the applicable base rate plus 1.25%) if we do not maintain an investment grade rating. We pay unused commitment fees of 0.25% per annum on the unused lender commitments under the Credit Facility. If we are unable to meet the financial obligations under the Credit Facility, the Credit Facility lending group will have a superior claim to the assets of MSCC and its subsidiaries (excluding the assets of the Funds) over our stockholders in the event we liquidate or the lending group exercises its remedies under the Credit Facility as the result of a default by us.

In April 2013, we issued $92.0 million in aggregate principal amount of 6.125% Notes due 2023 (the "6.125% Notes"). As of December 31, 2017, the outstanding balance of the 6.125% Notes was $90.7 million. The 6.125% Notes are unsecured obligations and rank pari passu with our current and future unsecured indebtedness; senior to any of our future indebtedness that expressly provides it is subordinated to the 6.125% Notes; effectively subordinated to all of our existing and future secured indebtedness, to the extent of the value of the assets securing such indebtedness, including borrowings under our Credit Facility; and structurally subordinated to all existing and future indebtedness and other obligations of any of our subsidiaries, including without limitation, the indebtedness of the Funds. The 6.125% Notes mature on April 1, 2023, and may be redeemed in whole or in part at any time or from time to time at our option on or after April 1, 2018. The 6.125% Notes bear interest at a rate of 6.125% per year.

In November 2014, we issued $175.0 million in aggregate principal amount of 4.50% unsecured notes due 2019 (the "4.50% Notes due 2019") at an issue price of 99.53%. As of December 31, 2017, the outstanding balance of the 4.50% Notes due 2019 was $175.0 million. The 4.50% Notes due 2019 are unsecured obligations and rank pari passu with our current and future unsecured indebtedness; senior to any of our future indebtedness that expressly provides it is subordinated to the 4.50% Notes due 2019; effectively subordinated to all of our existing and future secured indebtedness, to the extent of the value of the assets securing such indebtedness, including borrowings under our Credit Facility; and structurally subordinated to all existing and future indebtedness and other obligations of any of our subsidiaries, including without limitation, the indebtedness of the Funds. The 4.50% Notes due 2019 mature on December 1, 2019, and may be redeemed in whole or in part at any time at our option subject to certain make-whole provisions.

In November 2017, we issued $185.0 million in aggregate principal amount of 4.50% unsecured notes due 2022 (the "4.50% Notes due 2022," together with the 4.50% Notes due 2019, the "4.50% Notes" and, both of these together with the 6.125% Notes, the "Notes") at an issue price of 99.16%. As of December 31, 2017, the outstanding balance of the 4.50% Notes due 2022 was $185.0 million. The 4.50% Notes due 2022 are unsecured obligations and rank pari passu with our current and future unsecured indebtedness; senior to any of our future indebtedness that expressly provides it is subordinated to the 4.50% Notes due 2022; effectively subordinated to all of our existing and future secured indebtedness, to the extent of the value of the assets securing such indebtedness, including borrowings under our Credit Facility; and structurally subordinated to all existing and future indebtedness and other obligations of any of our subsidiaries, including without limitation, the indebtedness of the Funds. The 4.50% Notes due 2022 mature on December 1, 2022, and may be redeemed in whole or in part at any time at our option subject to certain make-whole provisions.

Our ability to achieve our investment objective may depend in part on our ability to access additional leverage on favorable terms by issuing debentures guaranteed by the SBA through the Funds, by borrowing from banks or insurance companies or by issuing other debt securities and there can be no assurance that such additional leverage can in fact be achieved.

Substantially all of our assets are currently pledged as collateral under our Credit Facility or are subject to a superior claim over our stockholders by the SBA. If we default on our obligations under the Credit Facility or our SBA-guaranteed debentures, the lenders and/or the SBA may have the right to foreclose upon and sell, or otherwise transfer, the collateral subject to their security interests or their superior claim. In such event, we may be forced to sell our investments to raise funds to repay our outstanding borrowings in order to avoid foreclosure and these forced sales may be at times and at prices we would not consider advantageous. Moreover, such deleveraging of our company could significantly impair our ability to effectively operate our business in the manner in which we have historically operated. As a result, we could be forced to curtail or cease new investment activities and lower or eliminate the dividends that we have historically paid to our stockholders. In addition, if the lenders exercise their right to sell the assets pledged under our Credit Facility, such sales may be completed at distressed sale prices, thereby diminishing or potentially eliminating the amount of cash available to us after repayment of the amounts outstanding under the Credit Facility.

As a BDC, under the 1940 Act we generally are not permitted to incur indebtedness unless immediately after such borrowing we have an asset coverage for total borrowings of at least 200% (i.e., the amount of debt may not exceed 50% of the value of our assets). Legislation introduced in the U.S. Senate and the U.S. House of Representatives during the 115th Congress proposes to modify this section of the 1940 Act and increase the amount of debt that BDCs may incur by modifying the asset coverage percentage from 200% to 150%. If such legislation is passed, we may be able to incur additional indebtedness in the future and, therefore, your risk of an investment in our securities may increase.

Recent U.S. debt ceiling and budget deficit concerns have increased the possibility of additional credit-rating downgrades and economic slowdowns, or a recession in the U.S. Although U.S. lawmakers passed legislation to raise the federal debt ceiling on multiple occasions, ratings agencies have lowered or threatened to lower the long-term sovereign credit rating on the United States. The impact of this or any further downgrades to the U.S. government's sovereign credit rating or its perceived creditworthiness could adversely affect the U.S. and global financial markets and economic conditions. Absent further quantitative easing by

the Federal Reserve, these developments could cause interest rates and borrowing costs to rise, which may negatively impact our ability to access the debt markets on favorable terms. In addition, disagreement over the federal budget has caused the U.S. federal government to shut down for periods of time. Continued adverse political and economic conditions could have a material adverse effect on our business, financial condition and results of operations.

LIBOR is the basic rate of interest used in lending transactions between banks on the London interbank market and is widely used as a reference for setting the interest rate on loans globally. We typically use LIBOR as a reference rate in floating-rate loans we extend to portfolio companies such that the interest due to us pursuant to a term loan extended to a portfolio company is calculated using LIBOR. The terms of our debt investments generally include minimum interest rate floors which are calculated based on LIBOR.

On July 27, 2017, the United Kingdom's Financial Conduct Authority, which regulates LIBOR, announced that it intends to phase out LIBOR by the end of 2021. It is unclear if at that time whether LIBOR will cease to exist or if new methods of calculating LIBOR will be established such that it continues to exist after 2021. The U.S. Federal Reserve, in conjunction with the Alternative Reference Rates Committee, a steering committee comprised of large U.S. financial institutions, is considering replacing U.S. dollar LIBOR with a new index calculated by short term repurchase agreements, backed by Treasury securities. If LIBOR ceases to exist, we may need to renegotiate the credit agreements extending beyond 2021 with our portfolio companies that utilize LIBOR as a factor in determining the interest rate to replace LIBOR with the new standard that is established.

We could experience fluctuations in our operating results due to a number of factors, including our ability or inability to make investments in companies that meet our investment criteria, the interest rate payable on the debt securities we acquire, the level of portfolio dividend and fee income, the level of our expenses, variations in and the timing of the recognition of realized and unrealized gains or losses, the degree to which we encounter competition in our markets and general economic conditions. As a result of these factors, operating results for any period should not be relied upon as being indicative of performance in future periods.

Our Board of Directors has the authority to modify or waive our current operating policies, investment criteria and strategies without prior notice and without stockholder approval. We cannot predict the effect any changes to our current operating policies, investment criteria and strategies would have on our business, net asset value, operating results and value of our stock. However, the effects might be adverse, which could negatively impact our ability to pay interest and principal payments to holders of our debt instruments and dividends to our stockholders and cause our investors to lose all or part of their investment in us.

To maintain RIC tax treatment under the Code, we must meet the following annual distribution, income source and asset diversification requirements:

Failure to meet these requirements may result in our having to dispose of certain investments quickly in order to prevent the loss of RIC status. Because most of our investments will be in private companies, and therefore will be illiquid, any such dispositions could be made at disadvantageous prices and could result in substantial losses. Moreover, if we fail to maintain RIC tax treatment for any reason and are subject to corporate income tax, the resulting corporate taxes could substantially reduce our net assets, the amount of income available for distribution and the amount of our distributions.

We intend to pay distributions to our stockholders out of assets legally available for distribution. We cannot assure you that we will achieve investment results that will allow us to pay a specified level of cash distributions, previously projected distributions for future periods, or year-to-year increases in cash distributions. Our ability to pay distributions might be adversely affected by, among other things, the impact of one or more of the risk factors described herein. In addition, the inability to satisfy the asset coverage test applicable to us as a BDC could limit our ability to pay distributions. All distributions will be paid at the discretion of our Board of Directors and will depend on our earnings, our financial condition, maintenance of our RIC status, compliance with applicable BDC regulations, compliance with our debt covenants, each of the Funds' compliance with applicable SBIC regulations and such other factors as our Board of Directors may deem relevant from time to time. We cannot assure you that we will pay distributions to our stockholders in the future.

When we make distributions, we will be required to determine the extent to which such distributions are paid out of current or accumulated taxable earnings, recognized capital gains or capital. To the extent there is a return of capital, investors will be required to reduce their basis in our stock for U.S. federal income tax purposes, which may result in higher tax liability when the shares are sold, even if they have not increased in value or have lost value. In addition, any return of capital will be net of any sales load and offering expenses

associated with sales of shares of our common stock. In the future, our distributions may include a return of capital.

We will include in income certain amounts that we have not yet received in cash, such as: (i) amortization of original issue discount, which may arise if we receive warrants in connection with the origination of a loan such that ascribing a value to the warrants creates original issue discount in the debt instrument, if we invest in a debt investment at a discount to the par value of the debt security or possibly in other circumstances; (ii) contractual payment-in-kind, or PIK, interest, which represents contractual interest added to the loan balance and due at the end of the loan term; (iii) contractual preferred dividends, which represents contractual dividends added to the preferred stock and due at the end of the preferred stock term, subject to adequate profitability at the portfolio company; or (iv) amortization of market discount, which is associated with loans purchased in the secondary market at a discount to par value. Such amortization of original issue discounts, increases in loan balances as a result of contractual PIK arrangements, cumulative preferred dividends, or amortization of market discount will be included in income before we receive the corresponding cash payments. We also may be required to include in income certain other amounts before we receive such amounts in cash. Investments structured with these features may represent a higher level of credit risk compared to investments generating income which must be paid in cash on a current basis. For the year ended December 31, 2017, (i) approximately 2.4% of our total investment income was attributable to PIK income not paid currently in cash, (ii) approximately 0.6% of our total investment income was attributable to amortization of original issue discount, (iii) approximately 1.6% of our total investment income was attributable to cumulative dividend income not paid currently in cash, and (iv) approximately 2.9% of our total investment income was attributable to amortization of market discount on loans purchased in the secondary market at a discount.

Since, in certain cases, we may recognize taxable income before or without receiving cash representing such income, we may have difficulty meeting the Annual Distribution Requirement necessary to maintain RIC tax treatment under the Code. Accordingly, we may have to sell some of our investments at times and/or at prices we would not consider advantageous, raise additional debt or equity capital or forgo new investment opportunities for this purpose. If we are not able to obtain cash from other sources, we may fail to qualify for RIC tax treatment and thus become subject to corporate-level U.S. federal income tax. For additional discussion regarding the tax implications of a RIC, please see "Business — Regulation — Taxation as a Regulated Investment Company."

We may distribute taxable dividends that are payable in part in our stock. Under certain applicable provisions of the Code and the Treasury regulations, distributions payable by us in cash or in shares of stock (at the stockholders election) would satisfy the Annual Distribution Requirement. The Internal Revenue Service has issued guidance providing that a dividend payable in stock or in cash at the election of the stockholders will be treated as a taxable dividend eligible for the dividends paid deduction provided that at least 20% of the total dividend is payable in cash and certain other requirements are satisfied. Taxable stockholders receiving such dividends will be required to include the full amount of the dividend as ordinary income (or as long-term capital gain to the extent such dividend is properly reported as a capital gain dividend) to the extent of our current and accumulated earnings and profits for U.S. federal income tax purposes. As a result, a U.S. stockholder may be required to pay tax with respect to such dividends in excess of any cash received. If a U.S. stockholder sells the stock it receives as a dividend in order to pay this tax, the sales proceeds may be less than the amount included in income with respect to the dividend, depending on the market price of our stock at the time of the sale. Furthermore, with respect to non-U.S. stockholders, we may be required to withhold U.S. tax with respect to such dividends, including in respect of all or a portion of such dividend that is payable in stock. In addition, if a significant number of our stockholders determine to sell shares of our stock in order to pay taxes owed on dividends, it may put downward pressure on the trading price of our stock.

In order for us to continue to qualify for RIC tax treatment and to minimize corporate-level U.S. federal taxes, we will be required to distribute substantially all of our net ordinary taxable income and net capital gain income, including taxable income from certain of our subsidiaries, which includes the income from the Funds. We will be partially dependent on the Funds for cash distributions to enable us to meet the RIC distribution requirements. The Funds may be limited by SBIC regulations from making certain distributions to us that may be necessary to enable us to maintain our status as a RIC. We may have to request a waiver of the SBA's restrictions for the Funds to make certain distributions to maintain our eligibility for RIC status. We cannot assure you that the SBA will grant such waiver and if the Funds are unable to obtain a waiver, compliance with the SBIC regulations may result in loss of RIC tax treatment and a consequent imposition of an entity-level tax on us.

In order to satisfy the requirements applicable to a RIC and to minimize corporate-level U.S. federal taxes, we intend to distribute to our stockholders substantially all of our net ordinary taxable income and net capital gain income. We may carry forward excess undistributed taxable income into the next year, net of the 4% U.S. federal excise tax. Any such carryover taxable income must be distributed through a dividend declared prior to filing the final tax return related to the year which generated such taxable income. As a BDC, we generally are required to meet an asset coverage ratio, as defined in the 1940 Act, of at least 200% immediately after each issuance of senior securities. This requirement limits the amount that we may borrow and may prohibit us from making distributions. Because we will continue to need capital to grow our Investment Portfolio, this limitation may prevent us from incurring debt and require us to raise additional equity at a time when it may be disadvantageous to do so.

While we expect to be able to borrow and to issue additional debt and equity securities, we cannot assure you that debt and equity financing will be available to us on favorable terms, or at all. In addition, as a BDC, we generally are not permitted to issue equity securities priced below net asset value without stockholder approval. If additional funds are not available to us, we could be forced to curtail or cease new investment activities, and our net asset value could decline.

The 1940 Act prohibits us from selling shares of our common stock at a price below the current net asset value per share of such stock, with certain exceptions. One such exception is prior stockholder approval of issuances below net asset value provided that our Board of Directors makes certain determinations. We did not seek stockholder authorization to sell shares of our common stock below the then current net asset value per share of our common stock at our 2017 annual meeting of stockholders because our common stock price per share had been trading significantly above the net asset value per share of our common stock, and we do not currently expect to seek such approval at our 2018 annual meeting of stockholders for the same reason. We may, however, seek such authorization at future annual or special meetings of stockholders. Our stockholders have previously approved a proposal to authorize us to issue securities to subscribe to, convert to, or purchase shares of our common stock in one or more offerings. Any decision to sell shares of our common stock below the then current net asset value per share of our common stock or securities to subscribe to, convert to, or purchase shares of our common stock would be subject to the determination by our Board of Directors that such issuance is in our and our stockholders' best interests.

If we were to sell shares of our common stock below net asset value per share, such sales would result in an immediate dilution to the net asset value per share. This dilution would occur as a result of the sale of shares at a price below the then current net asset value per share of our common stock and a proportionately greater decrease in a stockholder's interest in our earnings and assets and voting interest in us than the increase in our assets resulting from such issuance. In addition, if we issue securities to subscribe to, convert to or purchase shares of common stock, the exercise or conversion of such securities would increase the number of outstanding shares of our common stock. Any such exercise would be dilutive on the voting power of existing stockholders, and could be dilutive with regard to dividends and our net asset value, and other economic aspects of the common stock.

Because the number of shares of common stock that could be so issued and the timing of any issuance is not currently known, the actual dilutive effect cannot be predicted; however, the example below illustrates the effect of dilution to existing stockholders resulting from the sale of common stock at prices below the net asset value of such shares.

We, the Funds, and our portfolio companies are subject to applicable local, state and federal laws and regulations. New legislation may be enacted or new interpretations, rulings or regulations could be adopted, including those governing the types of investments we are permitted to make, any of which could harm us and our stockholders, potentially with retroactive effect. In addition, any change to the SBA's current debenture SBIC program could have a significant impact on our ability to obtain lower-cost leverage through the Funds, and therefore, our ability to compete with other finance companies.

Additionally, any changes to the laws and regulations governing our operations relating to permitted investments may cause us to alter our investment strategy in order to avail ourselves of new or different opportunities. Such changes could result in material differences to the strategies and plans set forth herein and may result in our investment focus shifting from the areas of expertise of our investment team to other types of investments in which our investment team may have less expertise or little or no experience. Thus, any such changes, if they occur, could have a material adverse effect on our results of operations and the value of your investment.

On December 20, 2017, the U.S. House of Representatives and the U.S. Senate each voted to approve H.R. 1 (the "Tax Cuts and Jobs Act") and, on December 22, 2017, President Trump signed the Tax Cuts and Jobs Act into law. The Tax Cuts and Jobs Act makes significant changes to the United States income tax rules applicable to both individuals and entities, including corporations. The Tax Cuts and Jobs Act includes provisions that, among other things, reduce the U.S. corporate tax rate, introduce a capital investment deduction, limit the interest deduction, limit the use of net operating losses to offset future taxable income and make extensive changes to the U.S. international tax system. The Tax Cuts and Jobs Act is complex and far-reaching, and we cannot predict the impact its enactment will have on us, our subsidiaries, our portfolio companies and the holders of our securities.

Terrorist acts, acts of war or natural disasters may disrupt our operations, as well as the operations of the businesses in which we invest. Such acts have created, and continue to create, economic and political uncertainties and have contributed to global economic instability. Future terrorist activities, military or security operations, or natural disasters could further weaken the domestic/global economies and create additional uncertainties, which may negatively impact the businesses in which we invest directly or indirectly and, in turn, could have a material adverse impact on our business, operating results and financial condition. Losses from terrorist attacks and natural disasters are generally uninsurable.

Our business is highly dependent on our and third parties' communications and information systems. Any failure or interruption of those systems, including as a result of the termination of an agreement with any third-party service providers, could cause delays or other problems in our activities. Our financial, accounting, data processing, backup or other operating systems and facilities may fail to operate properly or become disabled or damaged as a result of a number of factors including events that are wholly or partially beyond our control and adversely affect our business. There could be:

The occurrence of a disaster such as a cyber-attack, a natural catastrophe, an industrial accident, a terrorist attack or war, events unanticipated in our disaster recovery systems, or a support failure from external providers, could have an adverse effect on our ability to conduct business and on our results of operations and financial condition, particularly if those events affect our computer-based data processing, transmission, storage, and retrieval systems or destroy data. If a significant number of our managers were unavailable in the event of a disaster, our ability to effectively conduct our business could be severely compromised.

We depend heavily upon computer systems to perform necessary business functions. Despite our implementation of a variety of security measures, our computer systems could be subject to cyber-attacks and unauthorized access, such as physical and electronic break-ins or unauthorized tampering. Like other companies, we may experience threats to our data and systems, including malware and computer virus attacks, unauthorized access, system failures and disruptions. If one or more of these events occurs, it could potentially jeopardize the confidential, proprietary and other information processed and stored in, and transmitted through, our computer systems and networks, or otherwise cause interruptions or malfunctions in our operations, which could result in damage to our reputation, financial losses, litigation, increased costs, regulatory penalties and/or customer dissatisfaction or loss.

Investing in our portfolio companies involves a number of significant risks. Among other things, these companies:

In addition, in the course of providing significant managerial assistance to certain of our portfolio companies, certain of our officers and directors may serve as directors on the boards of such companies. To the extent that litigation arises out of our investments in these companies, our officers and directors may be named as defendants in such litigation, which could result in an expenditure of funds (through our indemnification of such officers and directors) and the diversion of management time and resources.

A decline in oil and natural gas prices could adversely affect (i) the credit quality of our debt investments and (ii) the underlying operating performance of our equity investments in energy-related businesses and in portfolio companies located in geographic areas which are more sensitive to the health of the oil and gas industries. A decrease in credit quality and the operating performance would, in turn, negatively affect the fair value of these investments, which would consequently negatively affect our net asset value. Should a decline in oil and natural gas prices persist for an extended period of time, it is likely that the ability of these investments to satisfy financial or operating covenants imposed by us or other lenders will be adversely affected, thereby negatively impacting their financial condition and their ability to satisfy their debt service and other obligations to us. Likewise, should a decline in oil and natural gas prices persist, it is likely that our energy-related portfolio companies' and other affected companies' cash flow and profit generating capacities would also be adversely affected thereby negatively impacting their ability to pay us dividends or distributions on our equity investments.

Our investments may include original issue discount and contractual PIK interest, which represents contractual interest added to a loan balance and due at the end of such loan's term. To the extent original issue discount or PIK interest constitute a portion of our income, we are exposed to typical risks associated with such income being required to be included in taxable and accounting income prior to receipt of cash, including the following:

We invest in companies whose securities are not publicly traded, and whose securities will be subject to legal and other restrictions on resale or will otherwise be less liquid than publicly traded securities. The illiquidity of these investments may make it difficult for us to sell these investments when desired. In addition, if we are required to liquidate all or a portion of our portfolio quickly, we may realize significantly less than the value at which we had previously recorded these investments. As a result, we do not expect to achieve liquidity in our investments in the near-term. Our investments are usually subject to contractual or legal restrictions on resale or are otherwise illiquid because there is usually no established trading market for such investments. The illiquidity of most of our investments may make it difficult for us to dispose of them at a favorable price, and, as a result, we may suffer losses.

We may not have the funds or ability to make additional investments in our portfolio companies. After our initial investment in a portfolio company, we may be called upon from time to time to provide additional funds to such company or have the opportunity to increase our investment through the extension of additional loans, the exercise of a warrant to purchase equity securities, or the funding of additional equity investments. There is no assurance that we will make, or will have sufficient funds to make, follow-on investments. Any decisions not to make a follow-on investment or any inability on our part to make such an investment may

have a negative impact on a portfolio company in need of such an investment, may result in a missed opportunity for us to increase our participation in a successful operation, may reduce our ability to protect an existing investment or may reduce the expected yield on the investment.

We invest primarily in the secured term debt of LMM, Private Loan and Middle Market companies and equity issued by LMM companies. Our portfolio companies may have, or may be permitted to incur, other debt that ranks equally with, or senior to, the debt in which we invest. By their terms, such debt instruments may entitle the holders to receive payment of interest or principal on or before the dates on which we are entitled to receive payments with respect to the debt instruments in which we invest. Also, in the event of insolvency, liquidation, dissolution, reorganization or bankruptcy of a portfolio company, holders of debt instruments ranking senior to our investment in that portfolio company would typically be entitled to receive payment in full before we receive any distribution. After repaying such senior creditors, such portfolio company may not have any remaining assets to use for repaying its obligation to us. In the case of debt ranking equally with debt instruments in which we invest, we would have to share on an equal basis any distributions with other creditors holding such debt in the event of an insolvency, liquidation, dissolution, reorganization or bankruptcy of the relevant portfolio company.

Even though we may have structured certain of our investments as secured loans, if one of our portfolio companies were to go bankrupt, depending on the facts and circumstances, and based upon principles of equitable subordination as defined by existing case law, a bankruptcy court could subordinate all or a portion of our claim to that of other creditors and transfer any lien securing such subordinated claim to the bankruptcy estate. The principles of equitable subordination defined by case law have generally indicated that a claim may be subordinated only if its holder is guilty of misconduct or where the senior loan is re-characterized as an equity investment and the senior lender has actually provided significant managerial assistance to the bankrupt debtor. We may also be subject to lender liability claims for actions taken by us with respect to a borrower's business or instances where we exercise control over the borrower. It is possible that we could become subject to a lender liability claim, including as a result of actions taken in rendering significant managerial assistance or actions to compel and collect payments from the borrower outside the ordinary course of business.

Certain loans that we make are secured by a second priority security interest in the same collateral pledged by a portfolio company to secure senior debt owed by the portfolio company to commercial banks or other traditional lenders. Often the senior lender has procured covenants from the portfolio company prohibiting the incurrence of additional secured debt without the senior lender's consent. Prior to and as a condition of permitting the portfolio company to borrow money from us secured by the same collateral pledged to the senior lender, the senior lender will require assurances that it will control the disposition of any collateral in the event of bankruptcy or other default. In many such cases, the senior lender will require us to enter into an "intercreditor agreement" prior to permitting the portfolio company to borrow from us. Typically the intercreditor agreements we are requested to execute expressly subordinate our debt instruments to those held by the senior lender and further provide that the senior lender shall control: (1) the commencement of foreclosure or other proceedings to liquidate and collect on the collateral; (2) the nature, timing and conduct of foreclosure or other collection proceedings; (3) the amendment of any collateral document; (4) the release of the security interests in respect of any collateral; and (5) the waiver of defaults

under any security agreement. Because of the control we may cede to senior lenders under intercreditor agreements we may enter, we may be unable to realize the proceeds of any collateral securing some of our loans.

Finally, the value of the collateral securing our debt investment will ultimately depend on market and economic conditions, the availability of buyers and other factors. Therefore, there can be no assurance that the proceeds, if any, from the sale or sales of all of the collateral would be sufficient to satisfy the loan obligations secured by our first or second priority liens. There is also a risk that such collateral securing our investments will decrease in value over time, will be difficult to sell in a timely manner, will be difficult to appraise and will fluctuate in value based upon the success of the portfolio company and market conditions. If such proceeds are not sufficient to repay amounts outstanding under the loan obligations secured by our second priority liens, then we, to the extent not repaid from the proceeds of the sale of the collateral, will only have an unsecured claim against the company's remaining assets, if any.

We are classified as a non-diversified investment company within the meaning of the 1940 Act, which means that we are not limited by the 1940 Act with respect to the proportion of our assets that we may invest in securities of a single issuer. To the extent that we assume large positions in the securities of a small number of issuers, our net asset value may fluctuate to a greater extent than that of a diversified investment company as a result of changes in the financial condition or the market's assessment of the issuer. We may also be more susceptible to any single economic or regulatory occurrence than a diversified investment company. Beyond our RIC asset diversification requirements, we do not have fixed guidelines for diversification, and our investments could be concentrated in relatively few portfolio companies. See "Risk Factors — Risks Related to Our Business and Structure — We will be subject to corporate-level U.S. federal income tax if we are unable to qualify as a RIC under Subchapter M of the Code."

We do not, and do not expect to, control the decision making in many of our portfolio companies, even though we may have board representation or board observation rights, and our debt agreements may contain certain restrictive covenants. As a result, we are subject to the risk that a portfolio company in which we invest will make business decisions with which we disagree and the management of such company will take risks or otherwise act in ways that do not serve our interests as debt investors or minority equity holders. Due to the lack of liquidity for our investments in non-traded companies, we may not be able to dispose of our interests in our portfolio companies as readily as we would like or at an appropriate valuation. As a result, a portfolio company may make decisions that would decrease the value of our portfolio holdings.

A portfolio company's failure to satisfy financial or operating covenants imposed by us or other lenders could lead to non-payment of interest and other defaults and, potentially, termination of its loans and foreclosure on its secured assets, which could trigger cross-defaults under other agreements and jeopardize a portfolio company's ability to meet its obligations under the debt or equity securities that we hold. We may incur expenses to the extent necessary to seek recovery upon default or to negotiate new terms, which may include the waiver of certain financial covenants, with a defaulting portfolio company.

As a BDC, we are required to carry our investments at market value or, if no market value is ascertainable, at the fair value as determined in good faith by our Board of Directors. Decreases in the market

values or fair values of our investments will be recorded as unrealized depreciation. Any unrealized depreciation in our portfolio could be an indication of a portfolio company's inability to meet its repayment obligations to us with respect to affected loans or a potential impairment of the value of affected equity investments. This could result in realized losses in the future and ultimately in reductions of our income and gains available for distribution in future periods.

We are subject to the risk that the investments we make in our portfolio companies may be repaid prior to maturity. When this occurs, we will generally reinvest these proceeds in temporary investments, pending their future investment in new portfolio companies. These temporary investments will typically have substantially lower yields than the debt being prepaid and we could experience significant delays in reinvesting these amounts. Any future investment in a new portfolio company may also be at lower yields than the debt that was repaid. As a result, our results of operations could be materially adversely affected if one or more of our portfolio companies elect to prepay amounts owed to us. Additionally, prepayments could negatively impact our return on equity, which could result in a decline in the market price of our securities.

Some of our debt investments will bear interest at variable rates and may be negatively affected by changes in market interest rates. An increase in market interest rates would increase the interest costs and reduce the cash flows of our portfolio companies that have variable rate debt instruments, a situation which could reduce the value of the investment. The value of our investments could also be reduced from an increase in market interest rates as rates available to investors could make an investment in our securities less attractive than alternative investments. In addition, an increase in interest rates would make it more expensive for us to use debt to finance our investments. As a result, a significant increase in market interest rates could increase our cost of capital, which would reduce our net investment income. Conversely, decreases in market interest rates could negatively impact the interest income from our variable rate debt investments. A decrease in market interest rates may also have an adverse impact on our returns by requiring us to accept lower yields on our debt investments and by increasing the risk that our portfolio companies will prepay our debt investments, resulting in the need to redeploy capital at potentially lower rates.

Certain investments that we have made in the past and may make in the future include warrants or other equity securities. Investments in equity securities involve a number of significant risks, including the risk of further dilution as a result of additional issuances, inability to access additional capital and failure to pay current distributions. Investments in preferred securities involve special risks, such as the risk of deferred distributions, credit risk, illiquidity and limited voting rights. In addition, we may from time to time make non-control, equity investments in portfolio companies. Our goal is ultimately to realize gains upon our disposition of such equity interests. However, the equity interests we receive may not appreciate in value and, in fact, may decline in value. Accordingly, we may not be able to realize gains from our equity interests, and any gains that we do realize on the disposition of any equity interests may not be sufficient to offset any other losses we experience. We also may be unable to realize any value if a portfolio company does not have a liquidity event, such as a sale of the business, recapitalization or public offering, which would allow us to sell the underlying equity interests. We often seek puts or similar rights to give us the right to sell our equity securities back to the portfolio company issuer; however, we may be unable to exercise these put rights for the consideration provided in our investment documents if the issuer is in financial distress.

Our investments in foreign securities may involve significant risks in addition to the risks inherent in investments in U.S. securities. Our investment strategy contemplates potential investments in debt securities of foreign companies. Investing in foreign companies may expose us to additional risks not typically associated with investing in securities of U.S. companies. These risks include changes in exchange control regulations, political and social instability, expropriation, imposition of foreign taxes, less liquid markets and less available information than is generally the case in the U.S., higher transaction costs, less government supervision of exchanges, brokers and issuers, less developed bankruptcy laws, difficulty in enforcing contractual obligations, lack of uniform accounting and auditing standards and greater price volatility.

Although most of our investments will be U.S. dollar denominated, any investments denominated in a foreign currency will be subject to the risk that the value of a particular currency will change in relation to one or more other currencies. Among the factors that may affect currency values are trade balances, the level of short-term interest rates, differences in relative values of similar assets in different currencies, long-term opportunities for investment and capital appreciation, and political developments.

Shares of closed-end investment companies, including BDCs, may trade at a discount to net asset value. This characteristic of closed-end investment companies and BDCs is separate and distinct from the risk that our net asset value per share may decline. We cannot predict whether our common stock will trade at, above or below net asset value. In addition, if our common stock trades below our net asset value per share, we will generally not be able to issue additional common stock at the market price unless our stockholders approve such a sale and our Board of Directors makes certain determinations. See "— Risks Relating to Our Business and Structure — Stockholders may incur dilution if we sell shares of our common stock in one or more offerings at prices below the then current net asset value per share of our common stock or issue securities to subscribe to, convert to or purchase shares of our common stock" for a discussion related to us issuing shares of our common stock below net asset value.

Delays in investing the net proceeds raised in an offering or other capital raised or proceeds resulting from exiting an investment may cause our performance to be worse than that of other fully invested BDCs or other lenders or investors pursuing comparable investment strategies. We cannot assure you that we will be able to identify any investments that meet our investment objective or that any investment that we make will produce a positive return. We may be unable to invest the net proceeds of any offering or other capital raised or proceeds resulting from exiting an investment on acceptable terms within the time period that we anticipate or at all, which could harm our financial condition and operating results.

We anticipate that, depending on market conditions and the amount of the capital, it may take us a substantial period of time to invest substantially all the capital in securities meeting our investment objective. During this period, we may invest the capital primarily in Marketable securities and idle funds investments, which generally consist of debt investments, independently rated debt investments, certificates of deposit with financial institutions, diversified bond funds and publicly traded debt and equity investments and may produce returns that are significantly lower than the returns which we expect to achieve when our portfolio is fully invested in securities meeting our investment objective. As a result, any distributions that we pay during such period may be substantially lower than the distributions that we may be able to pay when our portfolio is fully invested in securities meeting our investment objective. In addition, until such time as the net proceeds

of any offering or from exiting an investment or other capital are invested in new securities meeting our investment objective, the market price for our securities may decline. Thus, the initial return on your investment may be lower than when, if ever, our portfolio is fully invested in securities meeting our investment objective.

The investments we make in accordance with our investment objective may result in a higher amount of risk than alternative investment options and a higher risk of volatility or loss of principal. Our investments in portfolio companies involve higher levels of risk, and therefore, an investment in our securities may not be suitable for someone with lower risk tolerance.

Fluctuations in the trading prices of our securities may adversely affect the liquidity of the trading market for our securities and, if we seek to raise capital through future securities offerings, our ability to raise such capital. The market price and liquidity of the market for our securities may be significantly affected by numerous factors, some of which are beyond our control and may not be directly related to our operating performance. These factors include:

The Maryland General Corporation Law and our articles of incorporation and bylaws contain provisions that may have the effect of discouraging, delaying or making difficult a change in control of our company or the removal of our incumbent directors. The existence of these provisions, among others, may have a negative

impact on the price of our common stock and may discourage third-party bids for ownership of our company. These provisions may prevent any premiums being offered to you for our common stock.

The Notes are not secured by any of our assets or any of the assets of our subsidiaries and rank equally in right of payment with all of our existing and future unsubordinated, unsecured indebtedness. As a result, the Notes are effectively subordinated to any secured indebtedness we or our subsidiaries have currently incurred and may incur in the future (or any indebtedness that is initially unsecured to which we subsequently grant security) to the extent of the value of the assets securing such indebtedness. In any liquidation, dissolution, bankruptcy or other similar proceeding, the holders of any of our existing or future secured indebtedness and the secured indebtedness of our subsidiaries may assert rights against the assets pledged to secure that indebtedness in order to receive full payment of their indebtedness before the assets may be used to pay other creditors, including the holders of the Notes. As of December 31, 2017, we had $64.0 million outstanding under the Credit Facility out of $585.0 million in commitments. The indebtedness under the Credit Facility is senior to the Notes to the extent of the value of the assets securing such indebtedness.

The Notes are obligations exclusively of Main Street Capital Corporation and not of any of our subsidiaries. None of our subsidiaries is a guarantor of the Notes, and the Notes are not required to be guaranteed by any subsidiaries we may acquire or create in the future. In addition, several of our subsidiaries, specifically the Funds, maintain significant indebtedness and as a result the Notes are structurally subordinated to the indebtedness of these subsidiaries. For example, as of December 31, 2017, the Funds had collectively issued $295.8 million of the current statutory maximum of $350.0 million of SBA-guaranteed debentures, which are included in our consolidated financial statements. The assets of such subsidiaries are not directly available to satisfy the claims of our creditors, including holders of the Notes. See "Management's Discussion and Analysis of Financial Condition and Results of Operations — Liquidity and Capital Resources" for more detail on the SBA-guaranteed debentures.

Except to the extent we are a creditor with recognized claims against our subsidiaries, all claims of other creditors of our subsidiaries have priority over our equity interests in such subsidiaries (and therefore the claims of our creditors, including holders of the Notes) with respect to the assets of such subsidiaries. Even if we are recognized as a creditor of one or more of our subsidiaries, our claims would still be effectively subordinated to any security interests in the assets of any such subsidiary and to any indebtedness or other liabilities of any such subsidiary senior to our claims. Consequently, the Notes are structurally subordinated to all indebtedness, including the SBA-guaranteed debentures, and other liabilities of any of our subsidiaries and any subsidiaries that we may in the future acquire or establish. In addition, our subsidiaries may incur substantial additional indebtedness in the future, all of which would be structurally senior to the Notes.

The Notes may or may not have an established trading market. If a trading market in the Notes is developed, it may not be maintained. If the Notes are traded, they may trade at a discount to their initial offering price depending on prevailing interest rates, the market for similar securities, our credit ratings, our financial condition or other relevant factors. Accordingly, we cannot assure you that a liquid trading market has been or will develop for the Notes, that you will be able to sell your Notes at a particular time or that the price you receive when you sell will be favorable. To the extent an active trading market does not develop or is not maintained, the liquidity and trading price for the Notes may be harmed. Accordingly, you may be required to bear the financial risk of an investment in the Notes for an indefinite period of time.

Our credit ratings are an assessment by rating agencies of our ability to pay our debts when due. Consequently, real or anticipated changes in our credit ratings will generally affect the market value of the Notes. These credit ratings may not reflect the potential impact of risks relating to the structure or marketing of the Notes. Credit ratings are not a recommendation to buy, sell or hold any security, and may be revised or withdrawn at any time by the issuing organization in its sole discretion. We undertake no obligation to maintain our credit ratings or to advise holders of Notes of any changes in our credit ratings. The Notes are currently rated by Standard & Poor's Ratings Services. There can be no assurance that our credit ratings will remain for any given period of time or that such credit ratings will not be lowered or withdrawn entirely by the rating agency if in their judgment future circumstances relating to the basis of the credit ratings, such as adverse changes in our company, so warrant. The conditions of the financial markets and prevailing interest rates have fluctuated in the past and are likely to fluctuate in the future, which could have an adverse effect on the market prices of the Notes.

The indentures under which the Notes were issued offer limited protection to holders of the Notes. The terms of the indentures and the Notes do not restrict our or any of our subsidiaries' ability to engage in, or otherwise be a party to, a variety of corporate transactions, circumstances or events that could have an adverse impact on investments in the Notes. In particular, the terms of the indentures and the Notes do not place any restrictions on our or our subsidiaries' ability to:

Furthermore, the terms of the indentures and the Notes do not protect holders of the Notes in the event that we experience changes (including significant adverse changes) in our financial condition, results of

operations or credit ratings, if any, as they do not require that we or our subsidiaries adhere to any financial tests or ratios or specified levels of net worth, revenues, income, cash flow or liquidity.

Our ability to recapitalize, incur additional debt and take a number of other actions that are not limited by the terms of the Notes may have important consequences for you as a holder of the Notes, including making it more difficult for us to satisfy our obligations with respect to the Notes or negatively affecting the trading value of the Notes.

Other debt we issue or incur in the future could contain more protections for its holders than the indentures and the Notes, including additional covenants and events of default. For example, the indentures under which the Notes are issued do not contain cross-default provisions that are contained in the Credit Facility. The issuance or incurrence of any such debt with incremental protections could affect the market for and trading levels and prices of the Notes.

The 4.50% Notes are redeemable in whole or in part upon certain conditions at any time or from time to time at our option. The 6.125% Notes are redeemable in whole or in part upon certain conditions at any time or from time to time at our option, on or after April 1, 2018. We may choose to redeem the Notes at times when prevailing interest rates are lower than the interest rate paid on the Notes. In this circumstance, you may not be able to reinvest the redemption proceeds in a comparable security at an effective interest rate as high as the Notes being redeemed.

We may not be able to repurchase the 4.50% Notes upon certain change in control events described in the indentures under which the 4.50% Notes were issued (each, a "Change of Control Repurchase Event") because we may not have sufficient funds. Upon a Change of Control Repurchase Event, holders of the 4.50% Notes may require us to repurchase for cash some or all of the 4.50% Notes at a repurchase price equal to 100% of the aggregate principal amount of the 4.50% Notes being repurchased, plus accrued and unpaid interest to, but not including, the repurchase date. The terms of our Credit Facility provide that certain change of control events will constitute an event of default thereunder entitling the lenders to accelerate any indebtedness outstanding under our Credit Facility at that time and to terminate the Credit Facility. In addition, the occurrence of a Change of Control Repurchase Event enabling the holders of the 4.50% Notes to require the mandatory purchase of the 4.50% Notes would constitute an event of default under our Credit Facility entitling the lenders to accelerate any indebtedness outstanding under our Credit Facility at that time and to terminate the Credit Facility. Our and our subsidiaries' future financing facilities may contain similar restrictions and provisions. Our failure to purchase such tendered 4.50% Notes upon the occurrence of such Change of Control Repurchase Event would cause an event of default under the indentures governing the 4.50% Notes and a cross-default under the agreements governing certain of our other indebtedness, which may result in the acceleration of such indebtedness requiring us to repay that indebtedness immediately. If a Change of Control Repurchase Event were to occur, we may not have sufficient funds to repay any such accelerated indebtedness.

As of December 31, 2017, we had approximately $810.5 million of indebtedness, including $64.0 million outstanding under the Credit Facility, $295.8 million outstanding from SBA-guaranteed debentures, approximately $90.7 million of the 6.125% Notes, $175.0 million of the 4.50% Notes due 2019 and $185.0 million of the 4.50% Notes due 2022 outstanding. Any default under the agreements governing our indebtedness, including a default under the Credit Facility, under the Notes or under other indebtedness to which we may be a party that is not waived by the required lenders or debt holders, and the remedies sought by the holders of such indebtedness could make us unable to pay principal, premium, if any, and interest on

the Notes and substantially decrease the market value of the Notes. If we are unable to generate sufficient cash flow and are otherwise unable to obtain funds necessary to meet required payments of principal, premium, if any, and interest on our indebtedness, or if we otherwise fail to comply with the various covenants, including financial and operating covenants, in the instruments governing our indebtedness, we could be in default under the terms of the agreements governing such indebtedness. In the event of such default, the holders of such indebtedness could elect to declare all the funds borrowed thereunder to be due and payable, together with accrued and unpaid interest, the lenders under the Credit Facility or other debt we may incur in the future could elect to terminate their commitments, cease making further loans and institute foreclosure proceedings against our assets, and we could be forced into bankruptcy or liquidation. Our ability to generate sufficient cash flow in the future is, to some extent, subject to general economic, financial, competitive, legislative and regulatory factors as well as other factors that are beyond our control. We cannot assure you that our business will generate cash flow from operations, or that future borrowings will be available to us under the Credit Facility or otherwise, in an amount sufficient to enable us to meet our payment obligations under the Notes and our other debt and to fund other liquidity needs.

If our operating performance declines and we are not able to generate sufficient cash flow to service our debt obligations, we may in the future need to refinance or restructure our debt, including the Notes, sell assets, reduce or delay capital investments, seek to raise additional capital or seek to obtain waivers from the required lenders under the Credit Facility or the required holders of the Notes or other debt that we may incur in the future to avoid being in default. If we are unable to implement one or more of these alternatives, we may not be able to meet our payment obligations under the Notes and our other debt. If we breach our covenants under the Credit Facility, the Notes or other debt and seek a waiver, we may not be able to obtain a waiver from the required lenders or debt holders. If this occurs, we would be in default under the Credit Facility, the Notes or other debt, the lenders or debt holders could exercise their rights as described above, and we could be forced into bankruptcy or liquidation. If we are unable to repay debt, lenders having secured obligations could proceed against the collateral securing the debt. Because the Credit Facility has, and any future credit facilities will likely have, customary cross-default provisions, if the indebtedness under the Notes, the Credit Facility or under any future credit facility is accelerated, we may be unable to repay or finance the amounts due.

We do not own any real estate or other physical properties materially important to our operations. Currently, we lease office space in Houston, Texas for our corporate headquarters.

We may, from time to time, be involved in litigation arising out of our operations in the normal course of business or otherwise. Furthermore, third parties may seek to impose liability on us in connection with the activities of our portfolio companies. While the outcome of any current legal proceedings cannot at this time be predicted with certainty, we do not expect any current matters will materially affect our financial condition or results of operations; however, there can be no assurance whether any pending legal proceedings will have a material adverse effect on our financial condition or results of operations in any future reporting period.

Item 5. Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Our common stock is traded on the New York Stock Exchange ("NYSE") under the symbol "MAIN." Prior to October 14, 2010, our common stock was traded on the NASDAQ Global Select Market under the same symbol "MAIN." Our common stock began trading on the NASDAQ Global Select Market on October 5, 2007. Prior to that date, there was no established public trading market for our common stock.

The following table sets forth, for each fiscal quarter during 2017 and 2016, the range of high and low closing prices of our common stock as reported on the NYSE.

On February 22, 2018, the last sale price of our common stock on the NYSE was $35.70 per share, and there were approximately 312 holders of record of the common stock which did not include stockholders for whom shares are held in "nominee" or "street name."

Shares of BDCs may trade at a market price that is less than the value of the net assets attributable to those shares. The possibility that our shares of common stock will trade at a discount from net asset value per share or at premiums that are unsustainable over the long term are separate and distinct from the risk that our net asset value per share will decrease. It is not possible to predict whether our common stock will trade at, above, or below net asset value per share. Since our IPO in October 2007, our shares of common stock have traded at prices both less than and exceeding our net asset value per share.

We currently pay regular monthly dividends and semiannual supplemental dividends to our stockholders. Our monthly dividends, if any, will be determined by our Board of Directors on a quarterly basis. Our semiannual supplemental dividends, if any, will be determined by our Board of Directors based upon our undistributed taxable income. The following table summarizes our dividends declared to date:

Date Declared	Record Date	Payment Date	Amount(1)

Fiscal year 2018
February 20, 2018	May 21, 2018	June 15, 2018	$	0.190
February 20, 2018	April 20, 2018	May 15, 2018	$	0.190
February 20, 2018	March 21, 2018	April 16, 2018	$	0.190
October 31, 2017	February 22, 2018	March 15, 2018	$	0.190
October 31, 2017	January 19, 2018	February 15, 2018	$	0.190
October 31, 2017	December 29, 2017	January 12, 2018	$	0.190	(2)

			$	1.140



Fiscal year 2017
October 17, 2017	December 19, 2017	December 27, 2017	$	0.275	(2)
August 1, 2017	November 21, 2017	December 15, 2017	$	0.190	(2)
August 1, 2017	October 20, 2017	November 15, 2017	$	0.190	(2)
August 1, 2017	September 21, 2017	October 16, 2017	$	0.190	(2)
May 2, 2017	August 21, 2017	September 15, 2017	$	0.185	(2)
May 2, 2017	July 20, 2017	August 15, 2017	$	0.185	(2)
May 2, 2017	June 30, 2017	July 14, 2017	$	0.185	(2)
April 18, 2017	June 19, 2017	June 26, 2017	$	0.275	(2)
February 22, 2017	May 19, 2017	June 14, 2017	$	0.185	(2)
February 22, 2017	April 20, 2017	May 15, 2017	$	0.185	(2)
February 22, 2017	March 21, 2017	April 13, 2017	$	0.185	(2)
November 2, 2016	February 22, 2017	March 15, 2017	$	0.185	(2)
November 2, 2016	January 20, 2017	February 15, 2017	$	0.185	(2)
November 2, 2016	December 30, 2016	January 13, 2017	$	0.185	(3)

			$	2.785



Fiscal year 2016
October 18, 2016	December 16, 2016	December 23, 2016	$	0.275	(3)
August 2, 2016	November 21, 2016	December 13, 2016	$	0.185	(3)
August 2, 2016	October 20, 2016	November 15, 2016	$	0.185	(3)
August 2, 2016	September 21, 2016	October 14, 2016	$	0.185	(3)
May 3, 2016	August 19, 2016	September 15, 2016	$	0.180	(3)
May 3, 2016	July 21, 2016	August 15, 2016	$	0.180	(3)
May 3, 2016	July 1, 2016	July 15, 2016	$	0.180	(3)
April 20, 2016	June 20, 2016	June 27, 2016	$	0.275	(3)
February 23, 2016	May 20, 2016	June 15, 2016	$	0.180	(3)
February 23, 2016	April 21, 2016	May 16, 2016	$	0.180	(3)
February 23, 2016	March 21, 2016	April 15, 2016	$	0.180	(3)
November 3, 2015	February 22, 2016	March 15, 2016	$	0.180	(3)
November 3, 2015	January 22, 2016	February 17, 2016	$	0.180	(3)
November 3, 2015	December 30, 2015	January 15, 2016	$	0.180	(4)

			$	2.725



Fiscal year 2015
October 20, 2015	December 17, 2015	December 24, 2015	$	0.275	(4)
August 3, 2015	November 20, 2015	December 14, 2015	$	0.180	(4)
August 3, 2015	October 21, 2015	November 16, 2015	$	0.180	(4)
August 3, 2015	September 21, 2015	October 15, 2015	$	0.180	(4)
May 5, 2015	August 20, 2015	September 15, 2015	$	0.175	(4)
May 5, 2015	July 21, 2015	August 14, 2015	$	0.175	(4)
May 5, 2015	July 1, 2015	July 15, 2015	$	0.175	(4)
April 22, 2015	June 18, 2015	June 25, 2015	$	0.275	(4)
February 24, 2015	May 20, 2015	June 15, 2015	$	0.175	(4)
February 24, 2015	April 21, 2015	May 15, 2015	$	0.175	(4)
February 24, 2015	March 20, 2015	April 15, 2015	$	0.175	(4)
November 6, 2014	February 20, 2015	March 16, 2015	$	0.170	(4)
November 6, 2014	January 21, 2015	February 13, 2015	$	0.170	(4)
November 6, 2014	December 31, 2014	January 15, 2015	$	0.170	(5)

Total			$	2.650

(1): The determination of the tax attributes of our distributions is made annually, based upon our taxable income for the full year and distributions paid for the full year. Ordinary dividend distributions from a RIC do not qualify for the tax rate applicable to "qualified dividend income" from domestic corporations and qualified foreign corporations, except to the extent that the RIC received the income in the form of qualifying dividends from domestic corporations and qualified foreign corporations.
(2): These dividends attributable to fiscal year 2017 were comprised of ordinary income of $2.218 per share, long term capital gain of $0.490 per share, and qualified dividend income of $0.082 per share, and included dividends with a record date during fiscal year 2017, including the dividend declared and accrued as of December 31, 2017 and paid on January 12, 2018, pursuant to the Code.
(3): These dividends attributable to fiscal year 2016 were comprised of ordinary income of $1.911 per share, long term capital gain of $0.761 per share, and qualified dividend income of $0.058 per share, and included dividends with a record date during fiscal year 2016, including the dividend declared and accrued as of December 31, 2016 and paid on January 13, 2017, pursuant to the Code.
(4): These dividends attributable to fiscal year 2015 were comprised of ordinary income of $2.325 per share, long term capital gain of $0.231 per share, and qualified dividend income of $0.105 per share, and included dividends with a record date during fiscal year 2015, including the dividend declared and accrued as of December 31, 2015 and paid on January 15, 2016, pursuant to the Code.
(5): These dividends attributable to fiscal year 2014 were comprised of ordinary income of $2.083 per share, long term capital gain of $0.419 per share, and qualified dividend income of $0.048 per share, and included dividends with a record date during fiscal year 2014, including the dividend declared and accrued as of December 31, 2014 and paid on January 15, 2015, pursuant to the Code.
(6): These dividends attributable to fiscal year 2013 were comprised of ordinary income of $1.872 per share, long term capital gain of $0.346 per share, and qualified dividend income of $0.457 per share, and included dividends with a record date during fiscal year 2013, including the dividend declared and accrued as of December 31, 2013 and paid on January 15, 2014, pursuant to the Code.
(7): These dividends attributable to fiscal year 2012 were comprised of ordinary income of $0.923 per share, long term capital gain of $0.748 per share, and qualified dividend income of $0.054 per

share, and included dividends with a record date during fiscal year 2012, including the dividend declared and accrued as of December 31, 2012 and paid on January 15, 2013, pursuant to the Code.

(8): These dividends attributable to fiscal year 2011 were comprised of ordinary income of $1.253 per share, long term capital gain of $0.373 per share, and qualified dividend income of $0.069 per share, and included dividends with a record date during fiscal year 2011, including the dividend declared and accrued as of December 31, 2011 and paid on January 16, 2012, pursuant to the Code.
(9): These dividends attributable to fiscal year 2010 were comprised of ordinary income of $1.220 per share, long term capital gain of $0.268 per share, and qualified dividend income of $0.012 per share.
(10): These dividends attributable to fiscal year 2009 were comprised of ordinary income of $1.218 per share and long term capital gain of $0.157 per share and excluded the $0.125 paid on January 15, 2009 which had been declared and accrued as of December 31, 2008.
(11): These dividends attributable to fiscal year 2008 were comprised of ordinary income of $0.953 per share and long term capital gain of $0.597 per share, and included dividends with a record date during fiscal year 2008, including the $0.125 per share dividend declared and accrued as of December 31, 2008 and paid on January 15, 2009, pursuant to the Code.
(12): This quarterly dividend attributable to fiscal year 2007 was comprised of ordinary income of $0.105 per share and long term capital gain of $0.225 per share.

In accordance with the IRC sections 871(k) and 881(e), the following percentages represent the portion of our dividends that constitute interest-related dividends and short-term capital gains dividends for non-U.S. residents and foreign corporations.

Including the long-term capital gains discussed above, the following percentages represent the total dividends which are exempt from U.S. withholding tax.

To the extent non-U.S. resident taxes were withheld on ordinary dividends distributed, this information may be considered in connection with any claims for refund of such taxes to be filed by the non-U.S. resident stockholder with the Internal Revenue Service.

To obtain and maintain RIC tax treatment, we must, among other things, distribute at least 90% of our net ordinary taxable income and realized net short-term capital gains in excess of realized net long-term capital losses, if any. We will be subject to a 4% non-deductible U.S. federal excise tax on certain undistributed taxable income unless we distribute in a timely manner an amount at least equal to the sum of (1) 98% of our net ordinary taxable income for each calendar year, (2) 98.2% of our capital gain net income for the one-year period ending December 31 in that calendar year and (3) any taxable income recognized, but not distributed, in preceding years on which we paid no U.S. federal income tax. Dividends declared and paid by us in a year will generally differ from taxable income for that year, as such dividends may include the distribution of current year taxable income, less amounts carried over into the following year, and the distribution of prior year taxable income carried over into and distributed in the current year. For amounts we carry over into the following year, we will be required to pay a 4% U.S. federal excise tax on the amount by which 98% of our annual ordinary taxable income and 98.2% of capital gains exceeds our distributions for

the year. We may retain for investment some or all of our net capital gains (i.e., realized net long-term capital gains in excess of realized net short-term capital losses) and treat such amounts as deemed distributions to our stockholders. If we do this, our stockholders will be treated as if they had received actual distributions of the capital gains we retained and then reinvested the net after-tax proceeds in our common stock. In general, our stockholders also would be eligible to claim a tax credit (or, in certain circumstances, a tax refund) equal to their allocable shares of the tax we paid on the capital gains deemed distributed to them. We can offer no assurance that we will achieve results that will permit the payment of any cash distributions and, if we issue senior securities, we may be prohibited from making distributions if doing so causes us to fail to maintain the asset coverage ratios stipulated by the 1940 Act or if distributions are limited by the terms of any of our borrowings.

We may distribute taxable dividends that are payable in part in our stock. Under certain applicable provisions of the Code and the Treasury regulations, distributions payable by us in cash or in shares of stock (at the stockholders election) would satisfy the Annual Distribution Requirement. The Internal Revenue Service has issued private letter rulings providing that a dividend payable in stock or in cash at the election of the stockholders will be treated as a taxable dividend eligible for the dividends paid deduction provided that at least 20% of the total dividend is payable in cash and certain other requirements are satisfied. Taxable stockholders receiving such dividends will be required to include the full amount of the dividend as ordinary income (or as long-term capital gain to the extent such dividend is properly reported as a capital gain dividend), to the extent of our current and accumulated earnings and profits for U.S. federal income tax purposes. As a result, a U.S. stockholder may be required to pay tax with respect to such dividends in excess of any cash received. If a U.S. stockholder sells the stock it receives as a dividend in order to pay this tax, the sales proceeds may be less than the amount included in income with respect to the dividend, depending on the market price of our stock at the time of the sale. Furthermore, with respect to non-U.S. stockholders, we may be required to withhold U.S. tax with respect to such dividends, including in respect of all or a portion of such dividend that is payable in stock. In addition, if a significant number of our stockholders determine to sell shares of our stock in order to pay taxes owed on dividends, it may put downward pressure on the trading price of our stock.

We have adopted a dividend reinvestment plan ("DRIP") that provides for the reinvestment of dividends on behalf of our stockholders, unless a stockholder has elected to receive dividends in cash. As a result, if we declare a cash dividend, our stockholders who have not "opted out" of the DRIP by the dividend record date will have their cash dividend automatically reinvested into additional shares of MSCC common stock. The share requirements of the DRIP may be satisfied through the issuance of new shares of common stock or through open market purchases of common stock by the DRIP plan administrator. Newly issued shares will be valued based upon the final closing price of MSCC's common stock on a valuation date determined for each dividend by our Board of Directors. Shares purchased in the open market to satisfy the DRIP requirements will be valued based upon the average price of the applicable shares purchased by the DRIP plan administrator, before any associated brokerage or other costs.

During the year ended December 31, 2017, we issued a total of 234,513 shares of our common stock under the DRIP. These issuances were not subject to the registration requirements of the Securities Act of 1933, as amended. The aggregate value of the shares of our common stock issued under the DRIP during 2017 was approximately $9.2 million.

The following graph compares the stockholder return on our common stock from October 5, 2007 to December 31, 2017 with the S&P 500 Index, the Russell 2000 Index, the KBW Regional Bank Index and the Main Street Peer Group (as defined below). This comparison assumes $100.00 was invested on October 5, 2007 (the date our common stock began to trade in connection with our initial public offering) in our common stock and in the comparison groups and assumes the reinvestment of all cash dividends prior to any tax effect. The comparisons in the graph below are based on historical data and are not intended to forecast the possible future performance of our common stock.

COMPARISON OF STOCKHOLDER RETURN(1)
Among Main Street Capital Corporation, the S&P 500 Index, the Russell 2000 Index, the KBW
Regional Bank Index, and the Main Street Peer Group(2)
(For the Period October 5, 2007 to December 31, 2017)

The selected financial and other data as of and for the years ended December 31, 2017, 2016, 2015, 2014 and 2013 have been derived from consolidated financial statements that have been audited by Grant Thornton LLP, an independent registered public accounting firm. You should read this selected financial and other data in conjunction with our "Management's Discussion and Analysis of Financial Condition and Results of Operations" and the consolidated financial statements and related notes included in this Annual Report on Form 10-K.

	Twelve Months Ended December 31,

	2017			2016			2015			2014			2013
	(dollars in thousands, except per share amounts)
Statement of operations data:
Investment income:
Total interest, fee and dividend income	$	205,741		$	178,165		$	163,603		$	139,939		$	115,158
Interest from idle funds and other		—			174			986			824			1,339

Total investment income		205,741			178,339			164,589			140,763			116,497

Expenses:
Interest		(36,479	)		(33,630	)		(32,115	)		(23,589	)		(20,238	)
Compensation		(18,560	)		(16,408	)		(14,852	)		(12,337	)		(8,560	)
General and administrative		(11,674	)		(9,284	)		(8,621	)		(7,134	)		(4,877	)
Share-based compensation		(10,027	)		(8,304	)		(6,262	)		(4,215	)		(4,210	)
Expenses allocated to the External Investment Manager		6,370			5,089			4,335			2,048			—
Expenses reimbursed to MSCP(1)		—			—			—			—			(3,189	)

Total expenses		(70,370	)		(62,537	)		(57,515	)		(45,227	)		(41,074	)

Net investment income		135,371			115,802			107,074			95,536			75,423
Total net realized gain (loss) from investments		16,182			29,389			(21,316	)		23,206			7,277
Total net realized loss from SBIC debentures		(5,217	)		—			—			—			(4,775	)
Total net change in unrealized appreciation (depreciation) from investments		42,545			(6,576	)		10,871			(776	)		14,503
Total net change in unrealized appreciation (depreciation) from SBIC debentures and investment in MSCP(1)		6,212			(943	)		(879	)		(10,931	)		4,392
Income tax benefit (provision)		(24,471	)		1,227			8,687			(6,287	)		35

Net increase in net assets resulting from operations attributable to common stock	$	170,622		$	138,899		$	104,437		$	100,748		$	96,855



Net investment income per share — basic and diluted	$	2.39		$	2.23		$	2.18		$	2.20		$	2.06
Net increase in net assets resulting from operations attributable to common stock per share — basic and diluted	$	3.01		$	2.67		$	2.13		$	2.31		$	2.65
Weighted-average shares outstanding — basic and diluted		56,691,913			52,025,002			49,071,492			43,522,397			36,617,850

	As of December 31,

	2017		2016		2015		2014		2013
			(dollars in thousands)
Balance sheet data:
Assets:
Total portfolio investments at fair value	$	2,171,305	$	1,996,906	$	1,799,996	$	1,563,330	$	1,286,188
Marketable securities and idle funds investments		—		—		3,693		9,067		13,301
Cash and cash equivalents		51,528		24,480		20,331		60,432		34,701
Interest receivable and other assets		38,725		37,123		37,638		46,406		16,054
Deferred financing costs, net of accumulated amortization		3,837		12,645		13,267		14,550		9,931
Deferred tax asset, net		—		9,125		4,003		—		—

Total assets	$	2,265,395	$	2,080,279	$	1,878,928	$	1,693,785	$	1,360,175



Liabilities and net assets:
Credit facility	$	64,000	$	343,000	$	291,000	$	218,000	$	237,000
SBIC debentures at fair value(1)		288,483		239,603		223,660		222,781		187,050
4.50% Notes due 2022		182,015		—		—		—		—
4.50% Notes due 2019		173,616		175,000		175,000		175,000		—
6.125% Notes		89,057		90,655		90,738		90,823		90,882
Accounts payable and other liabilities		20,168		14,205		12,292		10,701		10,549
Payable for securities purchased		40,716		2,184		2,311		14,773		27,088
Interest payable		5,273		4,103		3,959		4,848		2,556
Dividend payable		11,146		10,048		9,074		7,663		6,577
Deferred tax liability, net		10,553		—		—		9,214		5,940

Total liabilities		885,027		878,798		808,034		753,803		567,642
Total net asset value		1,380,368		1,201,481		1,070,894		939,982		792,533

Total liabilities and net assets	$	2,265,395	$	2,080,279	$	1,878,928	$	1,693,785	$	1,360,175



Other data:
Weighted-average effective yield on LMM debt investments(2),(3)		12.0%		12.5%		12.2%		13.2%		14.7%
Number of LMM portfolio companies		70		73		71		66		62
Weighted-average effective yield on Middle Market debt investments(2),(3)		9.0%		8.5%		8.0%		7.8%		7.8%
Number of Middle Market portfolio companies		62		78		86		86		92
Weighted-average effective yield on Private Loan debt investments(2),(3)		9.2%		9.6%		9.5%		10.1%		11.3%
Number of Private Loan portfolio companies		54		46		40		31		15
Expense ratios (as percentage of average net assets):
Total expenses, including income tax expense		7.4%		5.5%		4.6%		5.8%		5.8%
Operating expenses		5.5%		5.6%		5.5%		5.1%		5.8%
Operating expenses, excluding interest expense		2.6%		2.6%		2.4%		2.4%		3.0%
Total investment return(4)		16.0%		37.4%		8.5%		–3.1%		16.7%
Total return based on change in NAV(5)		14.2%		13.0%		11.1%		12.7%		15.1%

(1): SBIC debentures for December 31, 2017, 2016, 2015, 2014 and 2013 are $295,800, $240,000, $225,000, $225,000, and $200,200 at par, respectively, with par of $50,000 for December 31, 2017, $75,200 for December 31, 2016, 2015, 2014 and 2013 recorded at fair value of $48,608, $74,803, $73,860, $72,981 and $62,050, as of December 31, 2017, 2016, 2015, 2014, 2013, and 2012, respectively.
(2): Weighted-average effective yield is calculated based on our debt investments at the end of each period and includes amortization of deferred debt origination fees and accretion of original issue discount, but excludes liquidation fees payable upon repayment and any debt investments on non-accrual status. The weighted-average annual effective yield is higher than what an investor in shares of our common stock will realize on its investment because it does not reflect any debt investments on non-accrual status, our expenses or any sales load paid by an investor. For information on our investments on non-accrual status, see "Management's Discussion and Analysis of Financial Condition and Results of Operations — Portfolio Asset Quality".
(3): Including investments on non-accrual status, the weighted-average effective yield for LMM, Middle Market, and Private Loan debt investments was 11.1%, 9.0%, and 9.0%, respectively, as of December 31, 2017.
(4): Total investment return is based on the purchase of stock at the current market price on the first day and a sale at the current market price on the last day of each period reported on the table and assumes reinvestment of dividends at prices obtained by our dividend reinvestment plan during the period. The return does not reflect any sales load that may be paid by an investor.
(5): Total return is based on change in net asset value and was calculated using the sum of ending net asset value plus dividends to stockholders and other non-operating changes during the period, as divided by the beginning net asset value. Non-operating changes include any items that affect net asset value other than the net increase in net assets resulting from operations, such as the effects of stock offerings, shares issued under the DRIP and equity incentive plans and other miscellaneous items.

Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations

The following discussion should be read in conjunction with our consolidated financial statements and the notes thereto included elsewhere in this Annual Report on Form 10-K.

Statements we make in the following discussion which express a belief, expectation or intention, as well as those that are not historical fact, are forward-looking statements that are subject to risks, uncertainties and assumptions. Our actual results, performance or achievements, or industry results, could differ materially from those we express in the following discussion as a result of a variety of factors, including the risks and uncertainties we have referred to under the headings "Cautionary Statement Concerning Forward-Looking Statements" and "Risk Factors" in Part I of this report.

MSC Adviser I, LLC (the "External Investment Manager") was formed in November 2013 as a wholly owned subsidiary of MSCC to provide investment management and other services to parties other than MSCC and its subsidiaries or their portfolio companies ("External Parties") and receives fee income for such services. MSCC has been granted no-action relief by the Securities and Exchange Commission ("SEC") to allow the External Investment Manager to register as a registered investment adviser under the Investment Advisers Act of 1940, as amended. Since the External Investment Manager conducts all of its investment management activities for External Parties, it is accounted for as a portfolio investment of MSCC and is not included as a consolidated subsidiary of MSCC in MSCC's consolidated financial statements.

Our principal investment objective is to maximize our portfolio's total return by generating current income from our debt investments and capital appreciation from our equity and equity-related investments, including warrants, convertible securities and other rights to acquire equity securities in a portfolio company. Our LMM companies generally have annual revenues between $10 million and $150 million, and our LMM portfolio investments generally range in size from $5 million to $50 million. Our Middle Market investments are made in businesses that are generally larger in size than our LMM portfolio companies, with annual revenues typically between $150 million and $1.5 billion, and our Middle Market investments generally range in size from $3 million to $20 million. Our private loan ("Private Loan") portfolio investments are primarily debt securities in privately held companies which have been originated through strategic relationships with other investment funds on a collaborative basis. Private Loan investments are typically similar in size, structure, terms and conditions to investments we hold in our LMM portfolio and Middle Market portfolio.

The following tables provide a summary of our investments in the LMM, Middle Market and Private Loan portfolios as of December 31, 2017 and 2016 (this information excludes the Other Portfolio investments and the External Investment Manager which are discussed further below):

As of December 31, 2017, we had Other Portfolio investments in eleven companies, collectively totaling approximately $104.6 million in fair value and approximately $109.4 million in cost basis and which comprised approximately 4.8% of our Investment Portfolio (as defined in "— Critical Accounting Policies — Basis of Presentation" below) at fair value. As of December 31, 2016, we had Other Portfolio investments in ten companies, collectively totaling approximately $100.3 million in fair value and approximately $107.1 million in cost basis and which comprised approximately 5.0% of our Investment Portfolio at fair value.

As previously discussed, the External Investment Manager is a wholly owned subsidiary that is treated as a portfolio investment. As of December 31, 2017, there was no cost basis in this investment and the investment had a fair value of approximately $41.8 million, which comprised approximately 1.9% of our Investment Portfolio at fair value. As of December 31, 2016, there was no cost basis in this investment and the investment had a fair value of approximately $30.6 million, which comprised approximately 1.5% of our Investment Portfolio at fair value.

Our portfolio investments are generally made through MSCC and the Funds. MSCC and the Funds share the same investment strategies and criteria, although they are subject to different regulatory regimes. An investor's return in MSCC will depend, in part, on the Funds' investment returns as they are wholly owned subsidiaries of MSCC.

The level of new portfolio investment activity will fluctuate from period to period based upon our view of the current economic fundamentals, our ability to identify new investment opportunities that meet our investment criteria, and our ability to consummate the identified opportunities. The level of new investment activity, and associated interest and fee income, will directly impact future investment income. In addition, the level of dividends paid by portfolio companies and the portion of our portfolio debt investments on non-accrual status will directly impact future investment income. While we intend to grow our portfolio and our investment income over the long term, our growth and our operating results may be more limited during depressed economic periods. However, we intend to appropriately manage our cost structure and liquidity position based on applicable economic conditions and our investment outlook. The level of realized gains or losses and unrealized appreciation or depreciation on our investments will also fluctuate depending upon portfolio activity, economic conditions and the performance of our individual portfolio companies. The changes in realized gains and losses and unrealized appreciation or depreciation could have a material impact on our operating results.

Because we are internally managed, we do not pay any external investment advisory fees, but instead directly incur the operating costs associated with employing investment and portfolio management professionals. We believe that our internally managed structure provides us with a beneficial operating expense structure when compared to other publicly traded and privately held investment firms which are externally managed, and our internally managed structure allows us the opportunity to leverage our non-interest operating expenses as we grow our Investment Portfolio. For the years ended December 31, 2017 and 2016, the ratio of our total operating expenses, excluding interest expense and the non-recurring professional fees and other expenses discussed below, as a percentage of our quarterly average total assets was 1.5%. Including the effect of the non-recurring expenses, the ratio for the year ended December 31, 2017 was 1.6%.

During May 2012, we entered into an investment sub-advisory agreement with HMS Adviser, LP ("HMS Adviser"), which is the investment advisor to HMS Income, a non-listed BDC, to provide certain investment advisory services to HMS Adviser. In December 2013, after obtaining required no-action relief from the SEC to allow us to own a registered investment adviser, we assigned the sub-advisory agreement to the External Investment Manager since the fees received from such arrangement could otherwise have negative consequences on our ability to meet the source-of-income requirement necessary for us to maintain our RIC tax treatment. Under the investment sub-advisory agreement, the External Investment Manager is entitled to 50% of the base management fee and the incentive fees earned by HMS Adviser under its advisory agreement with HMS Income. The External Investment Manager has conditionally agreed to waive a limited amount of the incentive fees otherwise earned. During the years ended December 31, 2017, 2016 and 2015, the External Investment Manager earned $10.9 million, $9.5 million, and $7.8 million, respectively, of management fees (net of fees waived, if any) under the sub-advisory agreement with HMS Adviser.

Our consolidated financial statements are prepared in accordance with generally accepted accounting principles in the United States of America ("U.S. GAAP"). For each of the periods presented herein, our consolidated financial statements include the accounts of MSCC and its consolidated subsidiaries. The Investment Portfolio, as used herein, refers to all of our investments in LMM portfolio companies, investments in Middle Market portfolio companies, Private Loan portfolio investments, Other Portfolio investments, and the investment in the External Investment Manager. Our results of operations and cash flows for the years ended December 31, 2017, 2016 and 2015 and financial position as of December 31, 2017 and 2016, are presented on a consolidated basis. The effects of all intercompany transactions between us and our consolidated subsidiaries have been eliminated in consolidation.

We are an investment company following the accounting and reporting guidance in Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") 946, Financial Services — Investment Companies ("ASC 946"). Under regulations pursuant to Article 6 of Regulation S-X applicable to BDCs and ASC 946, we are precluded from consolidating other entities in which we have equity investments, including those in which we have a controlling interest, unless the other entity is another investment company. An exception to this general principle in ASC 946 occurs if we hold a controlling interest in an operating company that provides all or substantially all of its services directly to us or to any of our portfolio companies. Accordingly, as noted above, our consolidated financial statements include the financial position and operating results for the Funds and the Taxable Subsidiaries. We have determined that all of our portfolio investments do not qualify for this exception, including the investment in the External Investment Manager. Therefore, our Investment Portfolio is carried on the consolidated balance sheet at fair value with any adjustments to fair value recognized as "Net Change in Unrealized Appreciation (Depreciation)" on the consolidated statements of operations until the investment is realized, usually upon exit, resulting in any gain or loss being recognized as a "Net Realized Gain (Loss)."

The most significant determination inherent in the preparation of our consolidated financial statements is the valuation of our Investment Portfolio and the related amounts of unrealized appreciation and depreciation. As of both December 31, 2017 and 2016, our Investment Portfolio valued at fair value represented approximately 96% of our total assets. We are required to report our investments at fair value. We follow the provisions of Financial Accounting Standards Board ("FASB") ASC 820, Fair Value Measurements and Disclosures ("ASC 820"). ASC 820 defines fair value, establishes a framework for measuring fair value, establishes a fair value hierarchy based on the quality of inputs used to measure fair value, and enhances disclosure requirements for fair value measurements. ASC 820 requires us to assume that the portfolio investment is to be sold in the principal market to independent market participants, which may be a hypothetical market. Market participants are defined as buyers and sellers in the principal market that are independent, knowledgeable and willing and able to transact. See "Note B.1. — Valuation of the Investment Portfolio" in the notes to consolidated financial statements for a detailed discussion of our investment portfolio valuation process and procedures.

Our Board of Directors has the final responsibility for overseeing, reviewing and approving, in good faith, our determination of the fair value for our Investment Portfolio and our valuation procedures, consistent with 1940 Act requirements. We believe our Investment Portfolio as of December 31, 2017 and 2016 approximates fair value as of those dates based on the markets in which we operate and other conditions in existence on those reporting dates.

We record interest and dividend income on the accrual basis to the extent amounts are expected to be collected. Dividend income is recorded as dividends are declared by the portfolio company or at the point an obligation exists for the portfolio company to make a distribution. In accordance with our valuation policies, we evaluate accrued interest and dividend income periodically for collectability. When a loan or debt security becomes 90 days or more past due, and if we otherwise do not expect the debtor to be able to service all of its debt or other obligations, we will generally place the loan or debt security on non-accrual status and cease recognizing interest income on that loan or debt security until the borrower has demonstrated the ability and intent to pay contractual amounts due. If a loan or debt security's status significantly improves regarding the debtor's ability to service the debt or other obligations, or if a loan or debt security is sold or written off, we remove it from non-accrual status.

We may periodically provide services, including structuring and advisory services, to our portfolio companies or other third parties. For services that are separately identifiable and evidence exists to substantiate fair value, fee income is recognized as earned, which is generally when the investment or other applicable transaction closes. Fees received in connection with debt financing transactions for services that do not meet these criteria are treated as debt origination fees and are deferred and accreted into income over the life of the financing.

We hold certain debt and preferred equity instruments in our Investment Portfolio that contain PIK interest and cumulative dividend provisions. The PIK interest, computed at the contractual rate specified in each debt agreement, is periodically added to the principal balance of the debt and is recorded as interest income. Thus, the actual collection of this interest may be deferred until the time of debt principal repayment. Cumulative dividends are recorded as dividend income, and any dividends in arrears are added to the balance of the preferred equity investment. The actual collection of these dividends in arrears may be deferred until such time as the preferred equity is redeemed or sold. To maintain RIC tax treatment (as discussed below), these non-cash sources of income may need to be paid out to stockholders in the form of distributions, even though we may not have collected the PIK interest and cumulative dividends in cash. We stop accruing PIK interest and cumulative dividends and write off any accrued and uncollected interest and dividends in arrears when we determine that such PIK interest and dividends in arrears are no longer collectible. For the years ended December 31, 2017, 2016 and 2015, (i) approximately 2.4%, 3.6%, and 2.2%, respectively, of our total investment income was attributable to PIK interest income not paid currently in cash and (ii) approximately 1.6%, 1.2%, and 1.0%, respectively, of our total investment income was attributable to cumulative dividend income not paid currently in cash.

We account for our share-based compensation plans using the fair value method, as prescribed by ASC 718, Compensation — Stock Compensation. Accordingly, for restricted stock awards, we measure the grant date fair value based upon the market price of our common stock on the date of the grant and amortize the fair value of the awards as share-based compensation expense over the requisite service period, which is generally the vesting term.

MSCC has elected to be treated for U.S. federal income tax purposes as a RIC. MSCC's taxable income includes the taxable income generated by MSCC and certain of its subsidiaries, including the Funds, which are treated as disregarded entities for tax purposes. As a RIC, MSCC generally will not pay corporate-level U.S. federal income taxes on any net ordinary taxable income or capital gains that MSCC distributes to its stockholders. MSCC must generally distribute at least 90% of its "investment company taxable income" (which is generally its net ordinary taxable income and realized net short-term capital gains in excess of realized net long-term capital losses) and 90% of its tax-exempt income to maintain its RIC status (pass-through tax treatment for amounts distributed). As part of maintaining RIC status, undistributed taxable income (subject to a 4% non-deductible U.S. federal excise tax) pertaining to a given fiscal year may be distributed up to 12 months subsequent to the end of that fiscal year, provided such dividends are declared on or prior to the later of (i) filing of the U.S. federal income tax return for the applicable fiscal year or (ii) the fifteenth day of the ninth month following the close of the year in which such taxable income was generated.

The Taxable Subsidiaries primarily hold certain portfolio investments for us. The Taxable Subsidiaries permit us to hold equity investments in portfolio companies which are "pass-through" entities for tax purposes and to continue to comply with the "source-of-income" requirements contained in the RIC tax provisions of the Code. The Taxable Subsidiaries are consolidated with us for U.S. GAAP financial reporting purposes, and the portfolio investments held by the Taxable Subsidiaries are included in our consolidated financial statements as portfolio investments and recorded at fair value. The Taxable Subsidiaries are not consolidated with MSCC for income tax purposes and may generate income tax expense, or benefit, and tax assets and liabilities, as a result of their ownership of certain portfolio investments. The taxable income, or loss, of the Taxable Subsidiaries may differ from their book income, or loss, due to temporary book and tax timing differences and permanent differences. The Taxable Subsidiaries are each taxed at their normal corporate tax rates based on their taxable income. The income tax expense, or benefit, if any, and the related tax assets and liabilities, of the Taxable Subsidiaries are reflected in our consolidated financial statements.

The External Investment Manager is an indirect wholly owned subsidiary of MSCC owned through a Taxable Subsidiary and is a disregarded entity for tax purposes. The External Investment Manager has entered into a tax sharing agreement with its Taxable Subsidiary owner. Since the External Investment Manager is accounted for as a portfolio investment of MSCC and is not included as a consolidated subsidiary of MSCC in MSCC's consolidated financial statements, and as a result of the tax sharing agreement with its Taxable Subsidiary owner, for its stand-alone financial reporting purposes the External Investment Manager is treated as if it is taxed at normal corporate tax rates based on its taxable income and, as a result of its activities, may generate income tax expense or benefit. The income tax expense, or benefit, if any, and the related tax assets and liabilities, of the External Investment Manager are reflected in the External Investment Manager's separate financial statements.

In December 2017, the "Tax Cuts and Jobs Act" legislation was enacted. The Tax Cuts and Jobs Act includes significant changes to the U.S. corporate tax system, including a U.S. Federal corporate income tax rate reduction from 35% to 21% and other changes. ASC 740, Income Taxes, requires the effects of changes in tax rates and laws on deferred tax balances to be recognized in the period in which the legislation was enacted. As such, we have accounted for the tax effects as a result of the enactment of the Tax Cuts and Jobs Act as of December 31, 2017.

The Taxable Subsidiaries and the External Investment Manager use the liability method in accounting for income taxes. Deferred tax assets and liabilities are recorded for temporary differences between the tax basis of assets and liabilities and their reported amounts in the consolidated financial statements, using statutory tax rates in effect for the year in which the temporary differences are expected to reverse. A valuation allowance is provided, if necessary, against deferred tax assets when it is more likely than not that some portion or all of the deferred tax asset will not be realized.

Taxable income generally differs from net income for financial reporting purposes due to temporary and permanent differences in the recognition of income and expenses. Taxable income generally excludes net unrealized appreciation or depreciation, as investment gains or losses are not included in taxable income until they are realized.

Our LMM portfolio investments primarily consist of secured debt, equity warrants and direct equity investments in privately held, LMM companies based in the United States. Our LMM portfolio companies generally have annual revenues between $10 million and $150 million, and our LMM investments generally range in size from $5 million to $50 million. The LMM debt investments are typically secured by either a first or second priority lien on the assets of the portfolio company, generally bear interest at fixed rates, and generally have a term of between five and seven years from the original investment date. In most LMM portfolio companies, we receive nominally priced equity warrants and/or make direct equity investments in connection with a debt investment.

Our Middle Market portfolio investments primarily consist of direct investments in or secondary purchases of interest-bearing debt securities in privately held companies based in the United States that are generally larger in size than the companies included in our LMM portfolio. Our Middle Market portfolio companies generally have annual revenues between $150 million and $1.5 billion, and our Middle Market investments generally range in size from $3 million to $20 million. Our Middle Market portfolio debt investments are generally secured by either a first or second priority lien on the assets of the portfolio company and typically have a term of between three and seven years from the original investment date.

priority lien on the assets of the portfolio company and typically have a term of between three and seven years from the original investment date.

Our Other Portfolio investments primarily consist of investments which are not consistent with the typical profiles for LMM, Middle Market and Private Loan portfolio investments, including investments which may be managed by third parties. In the Other Portfolio, we may incur indirect fees and expenses in connection with investments managed by third parties, such as investments in other investment companies or private funds.

Our external asset management business is conducted through the External Investment Manager. The External Investment Manager earns management fees based on the assets of the funds under management and may earn incentive fees, or a carried interest, based on the performance of the funds managed. We have entered into an agreement with the External Investment Manager to share employees in connection with its asset management business generally, and specifically for its relationship with HMS Income. Through this agreement, we share employees with the External Investment Manager, including their related infrastructure, business relationships, management expertise and capital raising capabilities, and we allocate the related expenses to the External Investment Manager pursuant to the sharing agreement. Our total expenses for the years ended December 31, 2017, 2016 and 2015 are net of expenses allocated to the External Investment Manager of $6.4 million, $5.1 million, and $4.3 million, respectively. The External Investment Manager earns management fees based on the assets of the funds under management and may earn incentive fees, or a carried interest, based on the performance of the funds managed. The total contribution of the External Investment Manager to our net investment income consists of the combination of the expenses allocated to the External Investment Manager and the dividend income received from the External Investment Manager. For the years ended December 31, 2017, 2016 and 2015, the total contribution to our net investment income was $9.4 million, $7.9 million, and $6.5 million, respectively.

The following tables summarize the composition of our total combined LMM portfolio investments, Middle Market portfolio investments and Private Loan portfolio investments at cost and fair value by type of investment as a percentage of the total combined LMM portfolio investments, Middle Market portfolio investments and Private Loan portfolio investments as of December 31, 2017 and 2016 (this information excludes the Other Portfolio investments and the External Investment Manager).

Our LMM portfolio investments, Middle Market portfolio investments and Private Loan portfolio investments carry a number of risks including: (1) investing in companies which may have limited operating histories and financial resources; (2) holding investments that generally are not publicly traded and which may be subject to legal and other restrictions on resale; and (3) other risks common to investing in below

investment grade debt and equity investments in our Investment Portfolio. Please see "Risk Factors — Risks Related to Our Investments" for a more complete discussion of the risks involved with investing in our Investment Portfolio.

We utilize an internally developed investment rating system to rate the performance of each LMM portfolio company and to monitor our expected level of returns on each of our LMM investments in relation to our expectations for the portfolio company. The investment rating system takes into consideration various factors, including each investment's expected level of returns, the collectability of our debt investments and the ability to receive a return of the invested capital in our equity investments, comparisons to competitors and other industry participants, the portfolio company's future outlook and other factors that are deemed to be significant to the portfolio company.

The following table shows the distribution of our LMM portfolio investments on the 1 to 5 investment rating scale at fair value as of December 31, 2017 and 2016:

Based upon our investment rating system, the weighted-average rating of our LMM portfolio was approximately 2.2 and 2.3 as of December 31, 2017 and 2016, respectively.

As of December 31, 2017, our total Investment Portfolio had five investments on non-accrual status, which comprised approximately 0.2% of its fair value and 2.3% of its cost. As of December 31, 2016, our total Investment Portfolio had four investments on non-accrual status, which comprised approximately 0.6% of its fair value and 3.0% of its cost.

The operating results of our portfolio companies are impacted by changes in the broader fundamentals of the United States economy. In the event that the United States economy contracts, it is likely that the financial results of small to mid-sized companies, like those in which we invest, could experience

deterioration or limited growth from current levels, which could ultimately lead to difficulty in meeting their debt service requirements, to an increase in defaults on our debt investments or in realized losses on our investments and to difficulty in maintaining historical dividend payment rates and unrealized appreciation on our equity investments. Consequently, we can provide no assurance that the performance of certain portfolio companies will not be negatively impacted by economic cycles or other conditions, which could also have a negative impact on our future results.

For the year ended December 31, 2017, total investment income was $205.7 million, a 15% increase over the $178.3 million of total investment income for the corresponding period of 2016. This comparable period increase was principally attributable to (i) a $23.2 million increase in interest income primarily related to higher average levels of portfolio debt investments and increased activities involving existing Investment Portfolio debt investments, (ii) a $2.5 million increase in dividend income from Investment Portfolio equity investments and (iii) a $1.8 million increase in fee income. The $27.4 million increase in total investment income in the year ended December 31, 2017 includes (i) an increase of $6.7 million related to higher accelerated prepayment, repricing and other activity for certain portfolio debt investments when compared to the same period in 2016, (ii) an increase of $2.7 million related to interest income activity from portfolio companies that is considered to be less consistent on a recurring basis or non-recurring during the period when compared to the same period in 2016 and (iii) includes $1.7 million related to dividend income activity from portfolio companies that is considered to be less consistent on a recurring basis or non-recurring which is consistent with the amount from such dividend income activity in the same period in 2016.

For the year ended December 31, 2017, total expenses increased to $70.4 million from $62.5 million for the corresponding period of 2016. This comparable period increase in operating expenses was principally attributable to (i) a $2.8 million increase in interest expense, primarily due to (a) an increase of $1.4 million on the Credit Facility due to the higher average interest rate during 2017, (b) a $0.9 million increase as a result of the issuance of our 4.50% Notes due 2022 in November 2017 and (c) a $0.5 million increase on the SBIC debentures due to the higher average balance as compared to 2016, (ii) a $2.4 million increase in general and administrative expenses, including approximately $0.6 million related to non-recurring professional fees and other expenses incurred on certain potential new portfolio investment opportunities which were terminated during the due diligence and legal documentation processes, (iii) a $2.2 million increase in compensation expense related to increases in the number of personnel, base compensation levels and incentive compensation accruals and (iv) a $1.7 million increase in share-based compensation expense, with these increases partially offset by a $1.3 million increase in the expenses allocated to the External Investment Manager, in each case when compared to the same period in the prior year. For the years ended December 31, 2017 and 2016, the ratio of our total operating expenses, excluding interest expense and the non-recurring professional fees and other expenses discussed above as a percentage of our quarterly average total assets was 1.5%. Including the effect of the non-recurring expenses, the ratio for the year ended December 31, 2017 was 1.6%.

Net investment income for the year ended December 31, 2017 was $135.4 million, or a 17% increase, compared to net investment income of $115.8 million for the corresponding period of 2016. The increase in net investment income was principally attributable to the increase in total investment income, partially offset by higher operating expenses both as discussed above.

For the year ended December 31, 2017, distributable net investment income increased 17% to $145.4 million, or $2.56 per share, compared with $124.1 million, or $2.39 per share in 2016. The increase in distributable net investment income was primarily due to the higher level of total investment income, partially offset by higher operating expenses both as discussed above. Distributable net investment income on

a per share basis for the year ended December 31, 2017 reflects an (i) increase of approximately $0.16 per share from the comparable period in 2016 attributable to the net increase in the comparable levels of accelerated prepayment, repricing and other, unusual activity for certain Investment Portfolio debt investments and (ii) a greater number of average shares outstanding compared to the corresponding period in 2016 primarily due to shares issued through the ATM Program (as defined in "— Liquidity and Capital Resources — Capital Resources" below), shares issued pursuant to our equity incentive plans and shares issued pursuant to our dividend reinvestment plan.

The net increase in net assets resulting from operations during the year ended December 31, 2017 was $170.6 million, or $3.01 per share, compared with $138.9 million, or $2.67 per share, during the year ended December 31, 2016. This $31.7 million increase from the prior year was primarily the result of (i) a $56.3 million improvement in net change in unrealized appreciation (depreciation) from portfolio investments and SBIC debentures, including the impact of accounting reversals relating to realized gains/income (losses), from net unrealized depreciation of $7.5 million for the year ended December 31, 2016 to net unrealized appreciation of $48.8 million for the year ended December 31, 2017, which includes the impact of approximately $15.0 million of unrealized appreciation in the LMM equity portfolio related to the enactment of the Tax Cuts and Jobs Act (see further discussion above in "— Critical Accounting Policies — Income Taxes") and (ii) a $19.6 million increase in net investment income as discussed above, with these increases partially offset by (i) a $25.7 million change in the income tax benefit (provision) from an income tax benefit of $1.2 million for the year ended December 31, 2016 to an income tax provision of $24.5 million for the year ended December 31, 2017, (ii) a $13.2 million decrease in the net realized gain from investments to a total net realized gain from investments of $16.2 million for the year ended December 31, 2017 and (iii) a $5.2 million realized loss on the repayment of SBIC debentures outstanding at MSC II which had previously been accounted for on the fair value method of accounting. The net realized gain from investments of $16.2 million for the year ended December 31, 2017 was primarily the result of (i) the net realized gain of $11.8 million resulting from gains on the exits of five LMM investments and losses on the exits of four LMM investments, (ii) realized gains of $9.3 million due to activity in our Other Portfolio, (iii) net realized gains of $3.0 million in our Private Loan portfolio resulting from gains on the exits of two Private Loan investments and a loss on the restructure of a Private Loan investment, (iv) realized gains of $2.1 million related to other activity in the LMM portfolio and (v) the net realized loss of $9.8 million in our Middle Market portfolio, which is primarily the result of (a) realized losses of $7.9 million on the exits of two Middle Market investments and (b) the realized loss of $3.5 million on the restructure of a Middle Market investment, with these changes partially offset by $1.5 million of net realized gains on other activity in our Middle Market portfolio. The realized loss of $5.2 million on the repayment of SBIC debentures is related to the previously recognized bargain purchase gain resulting from recording the MSC II debentures at fair value on the date of the acquisition of the majority of the equity interests of MSC II in 2010. The effect of the realized loss is offset by the reversal of all previously recognized unrealized depreciation on these SBIC debentures due to fair value adjustments since the date of the acquisition.

The following table provides a summary of the total net unrealized appreciation of $48.8 million for the year ended December 31, 2017:

The income tax provision for the year ended December 31, 2017 of $24.5 million principally consisted of a deferred tax provision of $19.3 million, which is primarily the result of the net activity relating to our portfolio investments held in our Taxable Subsidiaries, including changes in loss carryforwards, changes in net unrealized appreciation/depreciation and other temporary book-tax differences, and other current tax expense of $5.2 million related to (i) a $1.9 million accrual for excise tax on our estimated undistributed taxable income and (ii) current tax expense of $3.3 million related to accruals for U.S. federal and state income taxes.

For the year ended December 31, 2016, total investment income was $178.3 million, an 8% increase over the $164.6 million of total investment income for the corresponding period of 2015. This comparable period increase was principally attributable to (i) a $7.4 million increase in interest income primarily related to

higher average levels of portfolio debt investments and (ii) a $7.9 million increase in dividend income from Investment Portfolio equity investments, partially offset by (i) a $0.7 million decrease in fee income and (ii) a $0.8 million decrease in investment income from Marketable securities and idle funds investments (as defined below). The $13.8 million increase in total investment income in the year ended December 31, 2016 includes an increase of $1.7 million related to dividend income activity from portfolio companies that is considered to be less consistent on a recurring basis or non-recurring during the period when compared to the same period in 2015, partially offset by a decrease of $0.4 million primarily related to lower accelerated prepayment and repricing activity for certain Investment Portfolio debt investments when compared to the same period in 2015.

For the year ended December 31, 2016, total expenses increased to $62.5 million from $57.5 million for the corresponding period of 2015. This comparable period increase in operating expenses was principally attributable to (i) a $2.0 million increase in share-based compensation expense, (ii) a $1.6 million increase in compensation expense related to increases in the number of personnel, base compensation levels and incentive compensation accruals, (iii) a $1.5 million increase in interest expense, primarily due to an increase in interest expense on the Credit Facility due to the higher average interest rate and balance outstanding in the year ended December 31, 2016 and (iv) a $0.7 million increase in general and administrative expenses, with these increases partially offset by a $0.8 million increase in the expenses allocated to the External Investment Manager, in each case when compared to the same period in the prior year. For the year ended December 31, 2016, the ratio of our total operating expenses, excluding interest expense, as a percentage of our quarterly average total assets was 1.5% compared to 1.4% for the year ended December 31, 2015.

Net investment income for the year ended December 31, 2016 was $115.8 million, or an 8% increase, compared to net investment income of $107.1 million for the corresponding period of 2015. The increase in net investment income was principally attributable to the increase in total investment income, partially offset by higher operating expenses as discussed above.

For the year ended December 31, 2016, distributable net investment income increased 10% to $124.1 million, or $2.39 per share, compared with $113.3 million, or $2.31 per share, in the corresponding period of 2015. The increase in distributable net investment income was primarily due to the higher level of total investment income, partially offset by higher operating expenses both as discussed above. Distributable net investment income on a per share basis for the year ended December 31, 2016 reflects an increase of approximately $0.03 per share from the comparable period in 2015 attributable to the increase in dividend income that is considered to be less consistent on a recurring basis or non-recurring, partially offset by (i) a decrease of approximately $0.01 per share from the comparable period in 2015 attributable to the net decrease in the comparable levels of accelerated prepayment, repricing and other activity for certain Investment Portfolio debt investments and (ii) a greater number of average shares outstanding compared to the corresponding period in 2015 primarily due to the March 2015 equity offering, shares issued through the ATM Program (as defined in "— Liquidity and Capital Resources — Capital Resources" below) and shares issued pursuant to our restricted stock plan and dividend reinvestment plan.

The net increase in net assets resulting from operations during the year ended December 31, 2016 was $138.9 million, or $2.67 per share, compared with $104.4 million, or $2.13 per share, during the year ended December 31, 2015. This $34.5 million increase from the same period in the prior year period was primarily the result of (i) a $50.7 million increase in the net realized gain (loss) from investments from a net realized loss of $21.3 million during the year ended December 31, 2015 to a net realized gain of $29.4 million for the

year ended December 31, 2016 and (ii) an $8.7 million increase in net investment income as discussed above, partially offset by (i) a $17.5 million decrease in net change in unrealized appreciation (depreciation), including accounting reversals relating to the realized gains (losses), from net unrealized appreciation of $10.0 million for the year ended December 31, 2015 to net unrealized depreciation of $7.5 million for the year ended December 31, 2016 and (ii) a $7.5 million decrease in the income tax benefit from the same period in the prior year. The net realized gain of $29.4 million for the year ended December 31, 2016 was primarily the result of (i) the net realized gain of $57.5 million on the exit five LMM investments and (ii) the net realized gain of $4.2 million due to activity in our Other Portfolio, partially offset by (i) the realized loss of $9.6 million on the exit of three Private Loan investments, (ii) the realized loss of $17.0 million related to the restructuring of five Middle Market investments, (iii) the net realized loss of $4.7 million on the exit of two Middle Market investments and (iv) the realized loss of $1.6 million on the exit of a Marketable securities and idle funds investment.

The following table provides a summary of the total net unrealized depreciation of $7.5 million for the year ended December 31, 2016:

The income tax benefit for the year ended December 31, 2016 of $1.2 million principally consisted of a deferred tax benefit of $3.3 million, which is primarily the result of the net activity relating to our portfolio investments held in our Taxable Subsidiaries, including changes in loss carryforwards, changes in net unrealized appreciation/depreciation and other temporary book-tax differences, partially offset by other current tax expense related to (i) a $1.7 million accrual for excise tax on our estimated undistributed taxable income and (ii) other current tax expense of $0.4 million related to accruals for U.S. federal and state income taxes.

For the year ended December 31, 2017, we experienced a net increase in cash and cash equivalents in the amount of approximately $27.0 million, which is the result of approximately $72.9 million of cash provided by our operating activities and approximately $45.9 million of cash used in financing activities.

During the period, $72.9 million of cash was provided by our operating activities, which resulted primarily from (i) cash flows we generated from the operating profits earned through our operating activities totaling $123.1 million, which is our $145.4 million of distributable net investment income, excluding the non-cash effects of the accretion of unearned income of $17.0 million, payment-in-kind interest income of $4.9 million, cumulative dividends of $3.2 million and the amortization expense for deferred financing costs of $2.8 million, (ii) cash uses totaling $876.7 million for the funding of new portfolio company investments and settlement of accruals for portfolio investments existing as of December 31, 2016, and (iii) cash proceeds totaling $826.5 million from (a) $819.4 million in cash proceeds from the sales and repayments of debt investments and sales of and return on capital of equity investments, (b) $4.5 million related to decreases in other assets and (c) $2.6 million related to increases in payables and accruals.

During the year ended December 31, 2017, $45.9 million in cash was used in financing activities, which principally consisted of (i) $150.9 million in net cash proceeds from the ATM Program (described below), (ii) $185.0 million in cash proceeds from the issuance of 4.50% Notes due 2022 in November 2017 and (iii) $81.0 million in cash proceeds from issuance of SBIC debentures, partially offset by (i) $279.0 million in net repayments on the Credit Facility and (ii) $148.4 million in cash dividends paid to stockholders, (iii) $25.2 million in repayment of SBIC debentures, (iii) $4.4 million for purchases of vested restricted stock from employees to satisfy their tax withholding requirements upon the vesting of such restricted stock and (iv) $5.9 million for payment of deferred debt issuance costs, SBIC debenture fees and other costs.

For the year ended December 31, 2016, we experienced a net increase in cash and cash equivalents in the amount of approximately $4.1 million, which is the result of approximately $42.7 million of cash used by our operating activities and approximately $46.9 million of cash provided by financing activities.

During the period, we used $42.7 million of cash from our operating activities, which resulted primarily from (i) cash flows we generated from the operating profits earned through our operating activities totaling $107.8 million, which is our $124.1 million of distributable net investment income, excluding the non-cash effects of the accretion of unearned income of $10.2 million, payment-in-kind interest income of $6.5 million, cumulative dividends of $2.2 million and the amortization expense for deferred financing costs of $2.6 million, (ii) cash uses totaling $641.7 million which primarily resulted from (a) the funding of new portfolio company investments and settlement of accruals for portfolio investments existing as of December 31, 2015, which collectively total $641.2 million, and (b) $0.5 million from the purchase of Marketable securities and idle funds investments and (iii) cash proceeds totaling $491.2 million from (a) $486.2 million in cash proceeds from the sales and repayments of debt investments and sales of and return on capital of equity investments and (b) $4.3 million of cash proceeds from the sale of Marketable securities and idle funds investments and (c) $0.7 million related to increases in payables and accruals.

During the year ended December 31, 2016, $46.9 million in cash was provided by financing activities, which principally consisted of (i) $112.0 million in net cash proceeds from the ATM Program (described below), (ii) $52.0 million in net cash proceeds from the Credit Facility and (iii) $15.0 million in cash proceeds from issuance of SBIC debentures, partially offset by (i) $127.5 million in cash dividends paid to stockholders, (ii) $2.6 million for purchases of vested restricted stock from employees to satisfy their tax withholding requirements upon the vesting of such restricted stock and (iii) $2.0 million for payment of deferred loan costs, SBIC debenture fees and other costs.

As of December 31, 2017, we had $51.5 million in cash and cash equivalents and $521.0 million of unused capacity under the Credit Facility, which we maintain to support our investment and operating activities. As of December 31, 2017, our net asset value totaled $1,380.4 million, or $23.53 per share.

The Credit Facility was amended in September 2017 to increase the total commitments to $585.0 million from a diversified group of fifteen lenders. The Credit Facility matures in September 2021 and contains an accordion feature which allows us to increase the total commitments under the facility to up to $750.0 million from new and existing lenders on the same terms and conditions as the existing commitments.

Borrowings under the Credit Facility bear interest, subject to our election, on a per annum basis at a rate equal to the applicable LIBOR rate (1.56% as of December 31, 2017) plus (i) 1.875% (or the applicable base rate (Prime Rate of 4.50% as of December 31, 2017) plus 0.875%) as long as we maintain an investment grade rating and meet certain agreed upon excess collateral and maximum leverage requirements, (ii) 2.0% (or the applicable base rate plus 1.0%) if we maintain an investment grade rating but do not meet certain excess collateral and maximum leverage requirements or (iii) 2.25% (or the applicable base rate plus 1.25%) if we do not maintain an investment grade rating. We pay unused commitment fees of 0.25% per annum on the unused lender commitments under the Credit Facility. The Credit Facility is secured by a first lien on the assets of MSCC and its subsidiaries, excluding the equity ownership or assets of the Funds and the External Investment Manager. The Credit Facility contains certain affirmative and negative covenants, including but not limited to: (i) maintaining a minimum availability of at least 10% of the borrowing base, (ii) maintaining an interest coverage ratio of at least 2.0 to 1.0, (iii) maintaining an asset coverage ratio of at least 1.5 to 1.0 and (iv) maintaining a minimum tangible net worth. The Credit Facility is provided on a revolving basis through its final maturity date in September 2021, and contains two, one-year extension options which could extend the final maturity by up to two years, subject to certain conditions, including lender approval. As of December 31, 2017, we had $64.0 million in borrowings outstanding under the Credit Facility, the interest rate on the Credit Facility was 3.2% and we were in compliance with all financial covenants of the Credit Facility.

Through the Funds, we have the ability to issue SBIC debentures guaranteed by the SBA at favorable interest rates and favorable terms and conditions up to a maximum amount of $350.0 million. During the year ended December 31, 2017, we issued $81.0 million of SBIC debentures and opportunistically prepaid $25.2 million of our existing SBIC debentures as part of an effort to manage the maturity dates of our oldest SBIC debentures, leaving $54.2 million of remaining capacity under our SBIC licenses. Debentures guaranteed by the SBA have fixed interest rates that equal prevailing 10-year Treasury Note rates plus a market spread and have a maturity of ten years with interest payable semiannually. The principal amount of the debentures is not required to be paid before maturity, but may be pre-paid at any time with no prepayment penalty. We expect to issue new SBIC debentures under the SBIC program in the future in an amount up to the regulatory maximum amount of $350.0 million for affiliated SBIC funds. As of December 31, 2017, through our three wholly owned SBICs, we had $295.8 million of outstanding SBIC debentures guaranteed by the SBA, which bear a weighted-average annual fixed interest rate of approximately 3.6%, paid semiannually, and mature ten years from issuance. The first maturity related to our SBIC debentures occurs in 2019, and the weighted-average remaining duration is approximately 5.8 years as of December 31, 2017.

In April 2013, we issued $92.0 million, including the underwriters' full exercise of their over-allotment option, in aggregate principal amount of the 6.125% Notes (the "6.125% Notes"). The 6.125% Notes are unsecured obligations and rank pari passu with our current and future unsecured indebtedness; senior to any of our future indebtedness that expressly provides it is subordinated to the 6.125% Notes; effectively subordinated to all of our existing and future secured indebtedness, to the extent of the value of the assets securing such indebtedness, including borrowings under our Credit Facility; and structurally subordinated to all existing and future indebtedness and other obligations of any of our subsidiaries, including without limitation, the indebtedness of the Funds. The 6.125% Notes mature on April 1, 2023, and may be redeemed

in whole or in part at any time or from time to time at our option on or after April 1, 2018. We may from time to time repurchase 6.125% Notes in accordance with the 1940 Act and the rules promulgated thereunder. As of December 31, 2017, the outstanding balance of the 6.125% Notes was $90.7 million.

The indenture governing the 6.125% Notes (the "6.125% Notes Indenture") contains certain covenants, including covenants requiring our compliance with (regardless of whether we are subject to) the asset coverage requirements set forth in Section 18(a)(1)(A) as modified by Section 61(a)(1) of the 1940 Act, as well as covenants requiring us to provide financial information to the holders of the 6.125% Notes and the Trustee if we cease to be subject to the reporting requirements of the Securities Exchange Act of 1934. These covenants are subject to limitations and exceptions that are described in the 6.125% Notes Indenture.

In November 2014, we issued $175.0 million in aggregate principal amount of the 4.50% Notes (the "4.50% Notes due 2019") at an issue price of 99.53%. The 4.50% Notes due 2019 are unsecured obligations and rank pari passu with our current and future unsecured indebtedness; senior to any of our future indebtedness that expressly provides it is subordinated to the 4.50% Notes due 2019; effectively subordinated to all of our existing and future secured indebtedness, to the extent of the value of the assets securing such indebtedness, including borrowings under our Credit Facility; and structurally subordinated to all existing and future indebtedness and other obligations of any of our subsidiaries, including without limitation, the indebtedness of the Funds. The 4.50% Notes due 2019 mature on December 1, 2019, and may be redeemed in whole or in part at any time at our option subject to certain make-whole provisions. The 4.50% Notes due 2019 bear interest at a rate of 4.50% per year payable semiannually on June 1 and December 1 of each year, beginning June 1, 2015. We may from time to time repurchase 4.50% Notes due 2019 in accordance with the 1940 Act and the rules promulgated thereunder. As of December 31, 2017, the outstanding balance of the 4.50% Notes due 2019 was $175.0 million.

The indenture governing the 4.50% Notes due 2019 (the "4.50% Notes due 2019 Indenture") contains certain covenants, including covenants requiring our compliance with (regardless of whether we are subject to) the asset coverage requirements set forth in Section 18(a)(1)(A) as modified by Section 61(a)(1) of the 1940 Act, as well as covenants requiring us to provide financial information to the holders of the 4.50% Notes due 2019 and the Trustee if we cease to be subject to the reporting requirements of the Securities Exchange Act of 1934. These covenants are subject to limitations and exceptions that are described in the 4.50% Notes due 2019 Indenture.

In November 2017, we issued $185.0 million in aggregate principal amount of the 4.50% Notes (the "4.50% Notes due 2022") at an issue price of 99.16%. The 4.50% Notes due 2022 are unsecured obligations and rank pari passu with our current and future unsecured indebtedness; senior to any of our future indebtedness that expressly provides it is subordinated to the 4.50% Notes due 2022; effectively subordinated to all of our existing and future secured indebtedness, to the extent of the value of the assets securing such indebtedness, including borrowings under our Credit Facility; and structurally subordinated to all existing and future indebtedness and other obligations of any of our subsidiaries, including without limitation, the indebtedness of the Funds. The 4.50% Notes due 2022 mature on December 1, 2022, and may be redeemed in whole or in part at any time at our option subject to certain make-whole provisions. The 4.50% Notes due 2022 bear interest at a rate of 4.50% per year payable semiannually on June 1 and December 1 of each year, beginning June 1, 2018. We may from time to time repurchase 4.50% Notes due 2022 in accordance with the 1940 Act and the rules promulgated thereunder. As of December 31, 2017, the outstanding balance of the 4.50% Notes due 2022 was $185.0 million.

The indenture governing the 4.50% Notes due 2022 (the "4.50% Notes due 2022 Indenture") contains certain covenants, including covenants requiring our compliance with (regardless of whether we are subject to) the asset coverage requirements set forth in Section 18(a)(1)(A) as modified by Section 61(a)(1) of the 1940 Act, as well as covenants requiring us to provide financial information to the holders of the 4.50% Notes due 2022 and the Trustee if we cease to be subject to the reporting requirements of the Securities Exchange Act of 1934. These covenants are subject to limitations and exceptions that are described in the 4.50% Notes due 2022 Indenture.

During March 2015, we completed a follow-on public equity offering of 4,370,000 shares of common stock, including the underwriters' full exercise of their option to purchase 570,000 additional shares, resulting in total net proceeds, including exercise of the underwriters' option to purchase additional shares and after deducting underwriting discounts and estimated offering expenses payable by us, of approximately $127.8 million.

In November 2015, we commenced a program with certain selling agents through which we can sell shares of our common stock by means of at-the-market offerings from time to time (the "ATM Program"). During the year ended December 31, 2015, we sold 140,568 shares of our common stock at a weighted-average price of $31.98 per share and raised $4.5 million of gross proceeds under the ATM Program. Net proceeds were $4.3 million after commissions to the selling agents on shares sold and offering costs.

During the year ended December 31, 2016, we sold 3,324,646 shares of our common stock at a weighted-average price of $34.17 per share and raised $113.6 million of gross proceeds under the ATM Program. Net proceeds were $112.0 million after commissions to the selling agents on shares sold and offering costs. As of December 31, 2016, sales transactions representing 42,413 shares had not settled and are not included in shares issued and outstanding on the face of the consolidated balance sheet, but are included in the weighted-average shares outstanding in the consolidated statement of operations and in the shares used to calculate our net asset value per share.

During the year ended December 31, 2017, we sold 3,944,972 shares of our common stock at a weighted-average price of $38.72 per share and raised $152.8 million of gross proceeds under the ATM Program. Net proceeds were $150.9 million after commissions to the selling agents on shares sold and offering costs. As of December 31, 2017, 1,911,356 shares remained available for sale under the ATM Program.

We anticipate that we will continue to fund our investment activities through existing cash and cash equivalents, cash flows generated through our ongoing operating activities, utilization of available borrowings under our Credit Facility, and a combination of future issuances of debt and equity capital. Our primary uses of funds will be investments in portfolio companies, operating expenses and cash distributions to holders of our common stock.

We periodically invest excess cash balances into Marketable securities and idle funds investments. The primary investment objective of Marketable securities and idle funds investments is to generate incremental cash returns on excess cash balances prior to utilizing those funds for investment in our LMM, Middle Market and Private Loan portfolio investments. Marketable securities and idle funds investments generally consist of debt investments, independently rated debt investments, certificates of deposit with financial institutions, diversified bond funds and publicly traded debt and equity investments.

If our common stock trades below our net asset value per share, we will generally not be able to issue additional common stock at the market price unless our stockholders approve such a sale and our Board of Directors makes certain determinations. We did not seek stockholder authorization to sell shares of our common stock below the then current net asset value per share of our common stock at our 2017 annual meeting of stockholders because our common stock price per share had been trading significantly above the net asset value per share of our common stock since 2011. We would therefore need future approval from our stockholders to issue shares below the then current net asset value per share.

In order to satisfy the Code requirements applicable to a RIC, we intend to distribute to our stockholders, after consideration and application of our ability under the Code to carry forward certain excess undistributed taxable income from one tax year into the next tax year, substantially all of our taxable income. In addition, as a BDC, we generally are required to meet a coverage ratio of total assets to total senior securities, which include borrowings and any preferred stock we may issue in the future, of at least 200%. This requirement limits the amount that we may borrow. In January 2008, we received an exemptive order from the SEC to exclude SBA-guaranteed debt securities issued by MSMF and any other wholly owned subsidiaries of ours

which operate as SBICs from the asset coverage requirements of the 1940 Act as applicable to us, which, in turn, enables us to fund more investments with debt capital.

In May 2014, the FASB issued Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 supersedes the revenue recognition requirements under ASC 605, Revenue Recognition, and most industry-specific guidance throughout the Industry Topics of the ASC. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Under the new guidance, an entity is required to perform the following five steps: (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. The new guidance will significantly enhance comparability of revenue recognition practices across entities, industries, jurisdictions and capital markets. Additionally, the guidance requires improved disclosures as to the nature, amount, timing and uncertainty of revenue that is recognized. In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net), which clarified the implementation guidance on principal versus agent considerations. In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, which clarified the implementation guidance regarding performance obligations and licensing arrangements. In May 2016, the FASB issued ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606) — Narrow-Scope Improvements and Practical Expedients, which clarified guidance on assessing collectability, presenting sales tax, measuring noncash consideration, and certain transition matters. In December 2016, the FASB issued ASU No. 2016-20, Revenue from Contracts with Customers (Topic 606) — Technical Corrections and Improvements, which provided disclosure relief, and clarified the scope and application of the new revenue standard and related cost guidance. The new guidance will be effective for the annual reporting period beginning after December 15, 2017, including interim periods within that reporting period. Early adoption would be permitted for annual reporting periods beginning after December 15, 2016. We expect to identify similar performance obligations under ASC 606 as compared with deliverables and separate units of account previously identified. As a result, we expect timing of our revenue recognition to remain the same.

In April 2015, the FASB issued ASU 2015-03, Interest — Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs, which requires debt financing costs related to a recognized debt liability to be presented on the balance sheet as a direct deduction from the related debt liability, similar to the presentation of debt discounts. Additionally in August 2015, the FASB issued ASU 2015-15, Interest — Imputation of Interest: Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements, which provides further clarification on the same topic and states that the SEC would not object to the deferral and presentation of debt issuance costs as an asset and subsequent amortization of the deferred costs over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. The Company adopted the guidance for debt arrangements that are not line-of-credit arrangements for the three months ended June 30, 2017. Comparative financial statements of prior interim and annual periods have been adjusted to apply the new method retrospectively. As a result of the adoption, the Company reclassified $7.9 million of deferred financing costs assets to a direct deduction from the related debt liability on the consolidated balance sheet as of December 31, 2016. The adoption of this guidance had no impact on net assets, the consolidated statements of operations or the consolidated statements of cash flows.

In May 2015, the FASB issued ASU 2015-07, Fair Value Measurements — Disclosures for Certain Entities that Calculate Net Asset Value per Share. This amendment updates guidance intended to eliminate the diversity in practice surrounding how investments measured at net asset value under the practical expedient with future redemption dates have been categorized in the fair value hierarchy. Under the updated guidance, investments for which fair value is measured at net asset value per share using the practical expedient should no longer be categorized in the fair value hierarchy, while investments for which fair value is measured at net asset value per share but the practical expedient is not applied should continue to be categorized in the fair value hierarchy. The updated guidance requires retrospective adoption for all periods presented and is effective for interim and annual reporting periods beginning after December 15, 2015, with early adoption permitted. The Company adopted this standard during the three months ended March 31, 2016. There was no impact of the adoption of this new accounting standard on our consolidated financial statements as none of our investments are measured through the use of the practical expedient.

In February 2016, the FASB issued ASU 2016-02, Leases, which requires lessees to recognize on the balance sheet a right-of-use asset, representing its right to use the underlying asset for the lease term, and a lease liability for all leases with terms greater than 12 months. The guidance also requires qualitative and quantitative disclosures designed to assess the amount, timing, and uncertainty of cash flows arising from leases. The standard requires the use of a modified retrospective transition approach, which includes a number of optional practical expedients that entities may elect to apply. The new guidance is effective for annual periods beginning after December 15, 2018, and interim periods therein. Early application is permitted. While we continue to assess the effect of adoption, we currently believe the most significant change relates to the recognition of a new right-of-use asset and lease liability on our consolidated balance sheet for our office space operating lease. We currently have one operating lease for office space and do not expect a significant change in our leasing activity between now and adoption. See further discussion of our operating lease obligation in "Note M — Commitments and Contingences" in the notes to the consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, Compensation — Stock Compensation: Improvements to Employee Share-Based Payment Accounting, which is intended to simplify several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The guidance is effective for annual periods beginning after December 15, 2016, and interim periods therein. Early application is permitted. The Company elected to early adopt this standard during the three months ended March 31, 2016. See further discussion of the impact of the adoption of this standard in "Note B.8. — Summary of Significant Accounting Policies — Share-based Compensation" in the notes to consolidated financial statements.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230), which is intended to reduce the existing diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The guidance is effective for annual periods beginning after December 15, 2017, and interim periods therein. Early application is permitted. The impact of the adoption of this new accounting standard on our consolidated financial statements is not expected to be material.

From time to time, new accounting pronouncements are issued by the FASB or other standards setting bodies that are adopted by us as of the specified effective date. We believe that the impact of recently issued standards and any that are not yet effective will not have a material impact on our consolidated financial statements upon adoption.

Inflation has not had a significant effect on our results of operations in any of the reporting periods presented herein. However, our portfolio companies have experienced, and may in the future experience, the impacts of inflation on their operating results, including periodic escalations in their costs for labor, raw materials and third-party services and required energy consumption.

We may be a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financial needs of our portfolio companies. These instruments include commitments to extend credit and fund equity capital and involve, to varying degrees, elements of liquidity and credit risk in excess of the amount recognized in the balance sheet. At December 31, 2017, we had a total of $118.7 million in outstanding commitments comprised of (i) 36 investments with commitments to fund revolving loans that had not been fully drawn or term loans with additional commitments not yet funded and (ii) 11 investments with equity capital commitments that had not been fully called.

As of December 31, 2017, the future fixed commitments for cash payments in connection with our SBIC debentures, the 4.50% Notes due 2019, the 4.50% Notes due 2022 and the 6.125% Notes and rent obligations under our office lease for each of the next five years and thereafter are as follows:

As of December 31, 2017, we had $64.0 million in borrowings outstanding under our Credit Facility, and the Credit Facility is currently scheduled to mature in September 2021. The Credit Facility contains two, one-year extension options which could extend the maturity to September 2023, subject to lender approval. See further discussion of the Credit Facility terms in "— Liquidity and Capital Resources — Capital Resources."

As discussed further above, the External Investment Manager is treated as a wholly owned portfolio company of MSCC and is included as part of our Investment Portfolio. At December 31, 2017, we had a receivable of approximately $2.9 million due from the External Investment Manager which included approximately $2.0 million primarily related to operating expenses incurred by us as required to support the External Investment Manager's business and amounts due from the External Investment Manager to Main Street under a tax sharing agreement (see further discussion above in "— Critical Accounting

Policies — Income Taxes") and approximately $0.9 million of dividends declared but not paid by the External Investment Manager.

In November 2015, our Board of Directors approved and adopted the Main Street Capital Corporation Deferred Compensation Plan (the "2015 Deferred Compensation Plan"). The 2015 Deferred Compensation Plan became effective on January 1, 2016 and replaced the Deferred Compensation Plan for Non-Employee Directors previously adopted by the Board of Directors in June 2013 (the "2013 Deferred Compensation Plan"). Under the 2015 Deferred Compensation Plan, non-employee directors and certain key employees may defer receipt of some or all of their cash compensation and directors' fees, subject to certain limitations. Individuals participating in the 2015 Deferred Compensation Plan receive distributions of their respective balances based on predetermined payout schedules or other events as defined by the plan and are also able to direct investments made on their behalf among investment alternatives permitted from time to time under the plan, including phantom Main Street stock units. As of December 31, 2017, $4.0 million of compensation and directors' fees had been deferred under the 2015 Deferred Compensation Plan (including amounts previously deferred under the 2013 Deferred Compensation Plan). Of this amount, $2.5 million was deferred into phantom Main Street stock units, representing 74,487 shares of our common stock. Including phantom stock units issued through dividend reinvestment, the phantom stock units outstanding as of December 31, 2017 represented 89,040 shares of our common stock. Any amounts deferred under the plan represented by phantom Main Street stock units will not be issued or included as outstanding on the consolidated statements of changes in net assets until such shares are actually distributed to the participant in accordance with the plan, but are included in operating expenses and weighted-average shares outstanding in our consolidated statements of operations as earned.

declared for the second quarter of 2017. Including the dividends declared for the second quarter of 2018, we will have paid $22.530 per share in cumulative dividends since our October 2007 initial public offering.

We are subject to financial market risks, including changes in interest rates. Changes in interest rates may affect both our cost of funding and our interest income from portfolio investments. Our risk management systems and procedures are designed to identify and analyze our risk, to set appropriate policies and limits and to continually monitor these risks. Our investment income will be affected by changes in various interest rates, including LIBOR and prime rates, to the extent that any debt investments include floating interest rates. The majority of our debt investments are made with either fixed interest rates or floating rates that are subject to contractual minimum interest rates for the term of the investment. As of December 31, 2017, approximately 72% of our debt investment portfolio (at cost) bore interest at floating rates, 96% of which were subject to contractual minimum interest rates. Our interest expense will be affected by changes in the published LIBOR rate in connection with our Credit Facility; however, the interest rates on our outstanding SBIC debentures, 4.50% Notes due 2019, 4.50% Notes due 2022 and 6.125% Notes, which comprise the majority of our outstanding debt, are fixed for the life of such debt. As of December 31, 2017, we had not entered into any interest rate hedging arrangements. The following table shows the approximate annualized increase or decrease in the components of net investment income due to hypothetical base rate changes in interest rates, assuming no changes in our investments and borrowings as of December 31, 2017.

The hypothetical results would also be impacted by the changes in the amount of debt outstanding under our Credit Facility (with an increase (decrease) in the debt outstanding under the Credit Facility resulting in an (increase) decrease in the hypothetical interest expense).

We have audited the accompanying consolidated balance sheets of Main Street Capital Corporation (a Maryland corporation) and subsidiaries (the "Company"), including the consolidated schedule of investments, as of December 31, 2017 and 2016, the related consolidated statements of operations, changes in net assets, and cash flows for each of the three years in the period ended December 31, 2017, and the related notes, schedules and financial highlights (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2017 and 2016, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2017, and the financial highlights for each of the five years in the period ended December 31, 2017, in conformity with accounting principles generally accepted in the United States of America.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) ("PCAOB"), the Company's internal control over financial reporting as of December 31, 2017, based on criteria established in the 2013 Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission ("COSO"), and our report dated February 23, 2018 expressed an unqualified opinion.

These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures include examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. Our procedures included verification by confirmation of securities as of December 31, 2017 and 2016, by correspondence with the portfolio companies and custodians, or by other appropriate auditing procedures where replies were not received. We believe that our audits provide a reasonable basis for our opinion.

We have served as the Company's auditor since 2007.
Houston, Texas
February 23, 2018

We have audited the internal control over financial reporting of Main Street Capital Corporation (a Maryland corporation) and subsidiaries (the "Company") as of December 31, 2017, based on criteria established in the 2013 Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2017, based on criteria established in the 2013 Internal Control — Integrated Framework issued by COSO.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) ("PCAOB"), the consolidated financial statements of the Company, as of and for the year ended December 31, 2017 and our report dated February 23, 2018, expressed an unqualified opinion on those financial statements.

The Company's management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management's Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company's internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

	December 31, 2017			December 31, 2016

ASSETS
Portfolio investments at fair value:
Control investments (cost: $530,034 and $439,674 as of December 31, 2017 and 2016, respectively)	$	750,706		$	594,282
Affiliate investments (cost: $367,317 and $394,699 as of December 31, 2017 and 2016, respectively)		338,854			375,948
Non-Control/Non-Affiliate investments (cost: $1,107,447 and $1,037,510 as of December 31, 2017 and 2016, respectively)		1,081,745			1,026,676

Total investments (cost: $2,004,798 and $1,871,883 as of December 31, 2017 and 2016, respectively)		2,171,305			1,996,906
Cash and cash equivalents		51,528			24,480
Interest receivable and other assets		36,343			35,133
Receivable for securities sold		2,382			1,990
Deferred financing costs (net of accumulated amortization of $5,600 and $4,598 as of December 31, 2017 and 2016, respectively)		3,837			4,718
Deferred tax asset, net		—			9,125

Total assets	$	2,265,395		$	2,072,352



LIABILITIES
Credit facility	$	64,000		$	343,000
SBIC debentures (par: $295,800 and $240,000 as of December 31, 2017 and 2016, respectively)		288,483			235,686
4.50% Notes due 2022 (par: $185,000 and $0 as of December 31, 2017 and 2016, respectively)		182,015			—
4.50% Notes due 2019 (par: $175,000 as of both December 31, 2017 and 2016)		173,616			172,893
6.125% Notes (par: $90,655 as of both December 31, 2017 and 2016)		89,057			88,752
Accounts payable and other liabilities		20,168			14,205
Payable for securities purchased		40,716			2,184
Interest payable		5,273			4,103
Dividend payable		11,146			10,048
Deferred tax liability, net		10,553			—

Total liabilities		885,027			870,871
Commitments and contingencies (Note M)
NET ASSETS
Common stock, $0.01 par value per share (150,000,000 shares authorized; 58,660,680 and 54,312,444 shares issued and outstanding as of December 31, 2017 and 2016, respectively)		586			543
Additional paid-in capital		1,310,780			1,143,883
Accumulated net investment income, net of cumulative dividends of $662,563 and $521,297 as of December 31, 2017 and 2016, respectively		7,921			19,033
Accumulated net realized gain from investments (accumulated net realized gain from investments of $64,576 before cumulative dividends of $124,690 as of December 31, 2017 and accumulated net realized gain from investments of $48,394 before cumulative dividends of $107,281 as of December 31, 2016)		(60,114	)		(58,887	)
Net unrealized appreciation, net of income taxes		121,195			96,909

Total net assets		1,380,368			1,201,481

Total liabilities and net assets	$	2,265,395		$	2,072,352



NET ASSET VALUE PER SHARE	$	23.53		$	22.10

The accompanying notes are an integral part of these consolidated financial statements

	Twelve Months Ended December 31,

	2017			2016			2015
INVESTMENT INCOME:
Interest, fee and dividend income:
Control investments	$	62,762		$	52,221		$	49,832
Affiliate investments		37,509			37,702			27,200
Non-Control/Non-Affiliate investments		105,470			88,242			86,571

Interest, fee and dividend income		205,741			178,165			163,603
Interest, fee and dividend income from marketable securities and idle funds investments		—			174			986

Total investment income		205,741			178,339			164,589
EXPENSES:
Interest		(36,479	)		(33,630	)		(32,115	)
Compensation		(18,560	)		(16,408	)		(14,852	)
General and administrative		(11,674	)		(9,284	)		(8,621	)
Share-based compensation		(10,027	)		(8,304	)		(6,262	)
Expenses allocated to the External Investment Manager		6,370			5,089			4,335

Total expenses		(70,370	)		(62,537	)		(57,515	)

NET INVESTMENT INCOME		135,371			115,802			107,074
NET REALIZED GAIN (LOSS):
Control investments		259			32,220			(582	)
Affiliate investments		8,044			25,167			5,827
Non-Control/Non-Affiliate investments		7,879			(26,317	)		(25,147	)
Marketable securities and idle funds investments		—			(1,681	)		(1,414	)
SBIC debentures		(5,217	)		—			—

Total net realized gain (loss)		10,965			29,389			(21,316	)

NET CHANGE IN UNREALIZED APPRECIATION (DEPRECIATION):
Portfolio investments		42,545			(8,305	)		11,048
Marketable securities and idle funds investments		—			1,729			(177	)
SBIC debentures		6,212			(943	)		(879	)

Total net change in unrealized appreciation (depreciation)		48,757			(7,519	)		9,992

INCOME TAXES:
Federal and state income, excise and other taxes		(5,206	)		(2,089	)		(2,964	)
Deferred taxes		(19,265	)		3,316			11,651

Income tax benefit (provision)		(24,471	)		1,227			8,687

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS	$	170,622		$	138,899		$	104,437



NET INVESTMENT INCOME PER SHARE — BASIC AND DILUTED	$	2.39		$	2.23		$	2.18



NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS PER SHARE — BASIC AND DILUTED	$	3.01		$	2.67		$	2.13



DIVIDENDS PAID PER SHARE:
Regular monthly dividends	$	2.235		$	2.175		$	2.100
Supplemental dividends		0.550			0.550		$	0.550

Total dividends	$	2.785		$	2.725		$	2.650



WEIGHTED AVERAGE SHARES OUTSTANDING — BASIC AND DILUTED		56,691,913			52,025,002			49,071,492

The accompanying notes are an integral part of these consolidated financial statements

	Common Stock												Accumulated Net Realized Gain From Investments, Net of Dividends			Net Unrealized Appreciation from Investments, Net of Income Taxes

	Common Stock									Accumulated Net Investment Income, Net of Dividends
	Number of Shares			Par Value			Additional Paid-In Capital			Accumulated Net Investment Income, Net of Dividends									Total Net Asset Value
Balances at December 31, 2014		45,079,150		$	451		$	853,606		$	23,665		$	(20,456	)	$	82,716		$	939,982
Public offering of common stock, net of offering costs		4,510,568			46			132,003			—			—			—			132,049
Share-based compensation		—			—			6,262			—			—			—			6,262
Purchase of vested stock for employee payroll tax withholding		(54,840	)		(1	)		(1,739	)		—			—			—			(1,740	)
Dividend reinvestment		636,079			6			19,348			—			—			—			19,354
Amortization of directors' deferred compensation		—			—			423			—			—			—			423
Issuance of restricted stock, net of forfeited shares		242,787			2			(2	)		—			—			—			—
Other		—			—			1,566			—			—			—			1,566
Dividends to stockholders		—			—			—			(123,558	)		(7,881	)		—			(131,439	)
Net increase (decrease) resulting from operations		—			—			—			107,074			(21,316	)		18,679			104,437

Balances at December 31, 2015		50,413,744		$	504		$	1,011,467		$	7,181		$	(49,653	)	$	101,395		$	1,070,894



Balances at December 31, 2015		50,413,744		$	504		$	1,011,467		$	7,181		$	(49,653	)	$	101,395		$	1,070,894
Public offering of common stock, net of offering costs		3,324,646			33			112,006			—			—			—			112,039
Share-based compensation		—			—			8,304			—			—			—			8,304
Purchase of vested stock for employee payroll tax withholding		(80,750	)		(1	)		(2,592	)		—			—			—			(2,593	)
Dividend reinvestment		434,631			4			14,073			—			—			—			14,077
Amortization of directors' deferred compensation		—			—			628			—			—			—			628
Issuance of restricted stock, net of forfeited shares		262,586			3			(3	)		—			—			—			—
Dividends to stockholders		—			—			—			(103,950	)		(38,623	)		—			(142,573	)
Cumulative-effect to retained earnings for excess tax benefit		—			—			—			—			—			1,806			1,806
Net increase (decrease) resulting from operations		—			—			—			115,802			29,389			(6,292	)		138,899

Balances at December 31, 2016		54,354,857		$	543		$	1,143,883		$	19,033		$	(58,887	)	$	96,909		$	1,201,481



Balances at December 31, 2016		54,354,857		$	543		$	1,143,883		$	19,033		$	(58,887	)	$	96,909		$	1,201,481
Public offering of common stock, net of offering costs		3,947,165			40			150,946			—			—			—			150,986
Share-based compensation		—			—			10,027			—			—			—			10,027
Purchase of vested stock for employee payroll tax withholding		(113,371	)		(1	)		(4,350	)		—			—			—			(4,351	)
Investment through issuance of unregistered shares		11,464			—			442			—			—			—			442
Dividend reinvestment		234,513			2			9,154			—			—			—			9,156
Amortization of directors' deferred compensation		—			—			680			—			—			—			680
Issuance of restricted stock, net of forfeited shares		226,052			2			(2	)		—			—			—			—
Dividends to stockholders		—			—			—			(141,266	)		(17,409	)		—			(158,675	)
Net increase (decrease) resulting from operations		—			—			—			130,154			16,182			24,286			170,622

Balances at December 31, 2017		58,660,680		$	586		$	1,310,780		$	7,921		$	(60,114	)	$	121,195		$	1,380,368

The accompanying notes are an integral part of these consolidated financial statements

	Twelve Months Ended December 31,

	2017			2016			2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net increase in net assets resulting from operations	$	170,622		$	138,899		$	104,437
Adjustments to reconcile net increase in net assets resulting from operations to net cash provided by (used in) operating activities:
Investments in portfolio companies		(876,744	)		(641,197	)		(838,441	)
Proceeds from sales and repayments of debt investments in portfolio companies		737,297			409,542			570,454
Proceeds from sales and return of capital of equity investments in portfolio companies		82,128			76,731			34,780
Investments in marketable securities and idle funds investments		—			(523	)		(5,767	)
Proceeds from sales and repayments of marketable securities and idle funds investments		—			4,316			9,529
Net change in net unrealized (appreciation) depreciation		(48,757	)		7,519			(9,992	)
Net realized (gain) loss		(10,965	)		(29,389	)		21,316
Accretion of unearned income		(17,008	)		(10,211	)		(8,940	)
Payment-in-kind interest		(4,884	)		(6,497	)		(3,624	)
Cumulative dividends		(3,226	)		(2,200	)		(1,607	)
Share-based compensation expense		10,027			8,304			6,262
Amortization of deferred financing costs		2,784			2,582			2,553
Deferred tax (benefit) provision		19,265			(3,316	)		(11,651	)
Changes in other assets and liabilities:
Interest receivable and other assets		2,080			(2,564	)		(3,220	)
Interest payable		1,170			144			(889	)
Accounts payable and other liabilities		6,643			2,541			1,639
Deferred fees and other		2,470			2,589			1,769

Net cash provided by (used in) operating activities		72,902			(42,730	)		(131,392	)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from public offering of common stock, net of offering costs		150,986			112,039			132,049
Proceeds from public offering of 4.50% Notes due 2022		185,000			—			—
Dividends paid		(148,421	)		(127,522	)		(110,673	)
Proceeds from issuance of SBIC debentures		81,000			15,000			—
Repayments of SBIC debentures		(25,200	)		—			—
Proceeds from credit facility		448,000			390,000			534,000
Repayments on credit facility		(727,000	)		(338,000	)		(461,000	)
Payment of deferred loan costs and SBIC debenture fees		(5,868	)		(1,962	)		(1,260	)
Purchases of vested stock for employee payroll tax withholding		(4,351	)		(2,593	)		(1,740	)
Other		—			(83	)		(85	)

Net cash provided by (used in) financing activities		(45,854	)		46,879			91,291

Net increase in cash and cash equivalents		27,048			4,149			(40,101	)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD		24,480			20,331			60,432

CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	51,528		$	24,480		$	20,331



Supplemental cash flow disclosures:
Interest paid	$	32,411		$	30,756		$	30,450
Taxes paid	$	2,398		$	1,495		$	2,687
Non-cash financing activities:
Shares issued pursuant to the DRIP	$	9,156		$	14,077		$	19,354

The accompanying notes are an integral part of these consolidated financial statements

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)	Principal(4)		Cost(4)		Fair Value(18)


Control Investments(5)

Access Media Holdings, LLC(10)	Private Cable Operator
		5% Current / 5% PIK Secured Debt (Maturity — July 22, 2020)(19)	$	23,828	$	23,828	$	17,150
		Preferred Member Units (8,248,500 units)				8,142		—
		Member Units (45 units)				1		—

						31,971		17,150

ASC Interests, LLC	Recreational and Educational Shooting Facility
		11% Secured Debt (Maturity — July 31, 2018)		1,800		1,795		1,795
		Member Units (1,500 units)				1,500		1,530

						3,295		3,325

ATS Workholding, LLC(10)	Manufacturer of Machine Cutting Tools and Accessories
		5% Secured Debt (Maturity — November 16, 2021)		3,726		3,249		3,249
		Preferred Member Units (3,725,862 units)				3,726		3,726

						6,975		6,975

Bond-Coat, Inc.	Casing and Tubing Coating Services
		12% Secured Debt (Maturity — December 28, 2017)(17)		11,596		11,596		11,596
		Common Stock (57,508 shares)				6,350		9,370

						17,946		20,966

Café Brazil, LLC	Casual Restaurant Group
		Member Units (1,233 units)(8)				1,742		4,900

CBT Nuggets, LLC	Produces and Sells IT Training Certification Videos
		Member Units (416 units)(8)				1,300		89,560

Charps, LLC	Pipeline Maintenance and Construction
		12% Secured Debt (Maturity — February 3, 2022)		18,400		18,225		18,225
		Preferred Member Units (1,600 units)				400		650

						18,625		18,875

Clad-Rex Steel, LLC	Specialty Manufacturer of Vinyl-Clad Metal
		LIBOR Plus 9.50% (Floor 1.00%), Current Coupon 10.86%, Secured Debt (Maturity — December 20, 2021)(9)		13,280		13,168		13,280
		Member Units (717 units)(8)				7,280		9,500
		10% Secured Debt (Clad-Rex Steel RE Investor, LLC) (Maturity — December 20, 2036)		1,183		1,171		1,183
		Member Units (Clad-Rex Steel RE Investor, LLC) (800 units)				210		280

						21,829		24,243

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


CMS Minerals Investments	Oil & Gas Exploration & Production
		Member Units (CMS Minerals II, LLC) (100 units)(8)		3,440	2,392

Copper Trail Energy Fund I, LP(12)(13)	Investment Partnership
		LP Interests (Fully diluted 30.1%)		2,500	2,500

Datacom, LLC	Technology and Telecommunications Provider
		8% Secured Debt (Maturity — May 30, 2018)	1,575	1,575	1,575
		5.25% Current / 5.25% PIK Secured Debt (Maturity — May 30, 2019)(19)	12,349	12,311	11,110
		Class A Preferred Member Units		1,181	730
		Class B Preferred Member Units (6,453 units)		6,030	—

				21,097	13,415

Gamber-Johnson Holdings, LLC	Manufacturer of Ruggedized Computer Mounting Systems
		LIBOR Plus 11.00% (Floor 1.00%), Current Coupon 12.36%, Secured Debt (Maturity — June 24, 2021)(9)	23,400	23,213	23,400
		Member Units (8,619 units)(8)		14,844	23,370

				38,057	46,770

Garreco, LLC	Manufacturer and Supplier of Dental Products
		LIBOR Plus 10.00% (Floor 1.00%), Current Coupon 11.34%, Secured Debt (Maturity — March 31, 2020)(9)	5,483	5,443	5,443
		Member Units (1,200 units)		1,200	1,940

				6,643	7,383

GRT Rubber Technologies LLC	Manufacturer of Engineered Rubber Products
		LIBOR Plus 9.00% (Floor 1.00%), Current Coupon 10.36%, Secured Debt (Maturity — December 19, 2019)(9)	11,603	11,550	11,603
		Member Units (5,879 units)(8)		13,065	21,970

				24,615	33,573

Gulf Manufacturing, LLC	Manufacturer of Specialty Fabricated Industrial Piping Products
		Member Units (438 units)(8)		2,980	10,060

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Gulf Publishing Holdings, LLC	Energy Industry Focused Media and Publishing
		LIBOR Plus 9.50% (Floor 1.00%), Current Coupon 10.86%, Secured Debt (Maturity — September 30, 2020)(9)	80	80	80
		12.5% Secured Debt (Maturity — April 29, 2021)	12,800	12,703	12,703
		Member Units (3,681 units)		3,681	4,840

				16,464	17,623

Harborside Holdings, LLC	Real Estate Holding Company
		Member units (100 units)		6,206	9,400

Harris Preston Fund Investments(12)(13)	Investment Partnership
		LP Interests (2717 MH, L.P.) (Fully diluted 49.3%)		536	536

Harrison Hydra-Gen, Ltd.	Manufacturer of Hydraulic Generators
		Common Stock (107,456 shares)		718	3,580

HW Temps LLC	Temporary Staffing Solutions
		LIBOR Plus 11.00% (Floor 1.00%), Current Coupon 12.36%, Secured Debt (Maturity July 2, 2020)(9)	9,976	9,918	9,918
		Preferred Member Units (3,200 units)		3,942	3,940

				13,860	13,858

Hydratec, Inc.	Designer and Installer of Micro-Irrigation Systems
		Common Stock (7,095 shares)(8)		7,095	15,000

IDX Broker, LLC	Provider of Marketing and CRM Tools for the Real Estate Industry
		11.5% Secured Debt (Maturity — November 15, 2020)	15,250	15,116	15,250
		Preferred Member Units (5,607 units)(8)		5,952	11,660

				21,068	26,910

Jensen Jewelers of Idaho, LLC	Retail Jewelry Store
		Prime Plus 6.75% (Floor 2.00%), Current Coupon 11.00%, Secured Debt (Maturity — November 14, 2019)(9)	3,955	3,917	3,955
		Member Units (627 units)(8)		811	5,100

				4,728	9,055

KBK Industries, LLC	Manufacturer of Specialty Oilfield and Industrial Products
		10% Secured Debt (Maturity — September 28, 2020)	375	372	375
		12.5% Secured Debt (Maturity — September 28, 2020)	5,900	5,867	5,900
		Member Units (325 units)(8)		783	4,420

				7,022	10,695

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Lamb Ventures, LLC	Aftermarket Automotive Services Chain
		11% Secured Debt (Maturity — July 1, 2022)	9,942	9,890	9,942
		Preferred Equity (non-voting)		400	400
		Member Units (742 units)(8)		5,273	6,790
		9.5% Secured Debt (Lamb's Real Estate Investment I, LLC) (Maturity — March 31, 2027)	432	428	432
		Member Units (Lamb's Real Estate Investment I, LLC) (1,000 units)(8)		625	520

				16,616	18,084

Marine Shelters Holdings, LLC	Fabricator of Marine and Industrial Shelters
		12% PIK Secured Debt (Maturity — December 28, 2017)(14)	3,131	3,078	—
		Preferred Member Units (3,810 units)		5,352	—

				8,430	—

Market Force Information, LLC	Provider of Customer Experience Management Services
		LIBOR Plus 11.00% (Floor 1.00%), Current Coupon 12.48%, Secured Debt (Maturity — July 28, 2022)(9)	23,360	23,143	23,143
		Member Units (657,113 units)		14,700	14,700

				37,843	37,843

MH Corbin Holding LLC	Manufacturer and Distributor of Traffic Safety Products
		13% Secured Debt (Maturity — August 31, 2020)	12,600	12,526	12,526
		Preferred Member Units (4,000 shares)		6,000	6,000

				18,526	18,526

Mid-Columbia Lumber Products, LLC	Manufacturer of Finger-Jointed Lumber Products
		10% Secured Debt (Maturity — January 15, 2020)	1,398	1,390	1,390
		12% Secured Debt (Maturity — January 15, 2020)	3,900	3,863	3,863
		Member Units (5,714 units)		2,405	1,575
		9.5% Secured Debt (Mid-Columbia Real Estate, LLC) (Maturity — May 13, 2025)	791	791	791
		Member Units (Mid-Columbia Real Estate, LLC) (500 units)(8)		790	1,290

				9,239	8,909

MSC Adviser I, LLC(16)	Third Party Investment Advisory Services
		Member Units (Fully diluted 100.0%)(8)		—	41,768

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Mystic Logistics Holdings, LLC	Logistics and Distribution Services Provider for Large Volume Mailers
		12% Secured Debt (Maturity — August 15, 2019)	7,768	7,696	7,696
		Common Stock (5,873 shares)		2,720	6,820

				10,416	14,516

NAPCO Precast, LLC	Precast Concrete Manufacturing
		LIBOR Plus 8.50%, Current Coupon 9.98%, Secured Debt (Maturity — May 31, 2019)	11,475	11,439	11,475
		Member Units (2,955 units)(8)		2,975	11,670

				14,414	23,145

NRI Clinical Research, LLC	Clinical Research Service Provider
		LIBOR Plus 6.50% (Floor 1.50%), Current Coupon 8.00%, Secured Debt (Maturity — January 15, 2018)(9)	400	400	400
		14% Secured Debt (Maturity — January 15, 2018)	3,865	3,865	3,865
		Warrants (251,723 equivalent units; Expiration — September 8, 2021; Strike price — $0.01 per unit)		252	500
		Member Units (1,454,167 units)		765	2,500

				5,282	7,265

NRP Jones, LLC	Manufacturer of Hoses, Fittings and Assemblies
		12% Secured Debt (Maturity — March 20, 2023)	6,376	6,376	6,376
		Member Units (65,208 units)(8)		3,717	3,250

				10,093	9,626

NuStep, LLC	Designer, Manufacturer and Distributor of Fitness Equipment
		12% Secured Debt (Maturity — January 31, 2022)	20,600	20,420	20,420
		Preferred Member Units (406 units)		10,200	10,200

				30,620	30,620

OMi Holdings, Inc.	Manufacturer of Overhead Cranes
		Common Stock (1,500 shares)(8)		1,080	14,110

Pegasus Research Group, LLC	Provider of Telemarketing and Data Services
		Member Units (460 units)(8)		1,290	10,310

PPL RVs, Inc.	Recreational Vehicle Dealer
		LIBOR Plus 7.00% (Floor 0.50%), Current Coupon 8.34%, Secured Debt (Maturity — November 15, 2021)(9)	16,100	15,972	16,100
		Common Stock (1,962 shares)(8)		2,150	12,440

				18,122	28,540

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Principle Environmental, LLC (d/b/a TruHorizon Environmental Solutions)	Noise Abatement Service Provider
		13% Secured Debt (Maturity — April 30, 2020)	7,477	7,347	7,477
		Preferred Member Units (19,631 units)		4,600	11,490
		Warrants (1,018 equivalent units; Expiration — January 31, 2021; Strike price — $0.01 per unit)		1,200	650

				13,147	19,617

Quality Lease Service, LLC	Provider of Rigsite Accommodation Unit Rentals and Related Services
		Zero Coupon Secured Debt (Maturity — June 8, 2020)	7,341	7,341	6,950
		Member Units (1,000 units)		2,868	4,938

				10,209	11,888

River Aggregates, LLC	Processor of Construction Aggregates
		Zero Coupon Secured Debt (Maturity — June 30, 2018)	750	707	707
		Member Units (1,150 units)		1,150	4,610
		Member Units (RA Properties, LLC) (1,500 units)		369	2,559

				2,226	7,876

SoftTouch Medical Holdings LLC	Provider of In-Home Pediatric Durable Medical Equipment
		LIBOR Plus 9.00% (Floor 1.00%), Current Coupon 10.36%, Secured Debt (Maturity — October 31, 2019)(9)	7,140	7,110	7,140
		Member Units (4,450 units)(8)		4,930	10,089

				12,040	17,229

The MPI Group, LLC	Manufacturer of Custom Hollow Metal Doors, Frames and Accessories
		9% Secured Debt (Maturity — October 2, 2018)	2,924	2,923	2,410
		Series A Preferred Units (2,500 units)		2,500	—
		Warrants (1,424 equivalent units; Expiration — July 1, 2024; Strike price — $0.01 per unit)		1,096	—
		Member Units (MPI Real Estate Holdings, LLC) (100 units)(8)		2,300	2,389

				8,819	4,799

Uvalco Supply, LLC	Farm and Ranch Supply Store
		9% Secured Debt (Maturity — January 1, 2019)	348	348	348
		Member Units (1,867 units)(8)		3,579	3,880

				3,927	4,228

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)		Cost(4)		Fair Value(18)


Vision Interests, Inc.	Manufacturer / Installer of Commercial Signage
		13% Secured Debt (Maturity — December 23, 2018)	2,814		2,797		2,797
		Series A Preferred Stock (3,000,000 shares)			3,000		3,000
		Common Stock (1,126,242 shares)			3,706		—

					9,503		5,797

Ziegler's NYPD, LLC	Casual Restaurant Group
		6.5% Secured Debt (Maturity — October 1, 2019)	1,000		996		996
		12% Secured Debt (Maturity — October 1, 2019)	300		300		300
		14% Secured Debt (Maturity — October 1, 2019)	2,750		2,750		2,750
		Warrants (587 equivalent units; Expiration — September 29, 2018; Strike price — $0.01 per unit)			600		—
		Preferred Member Units (10,072 units)			2,834		3,220

					7,480		7,266

Subtotal Control Investments (34.6% of total investments at fair value)				$	530,034	$	750,706

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)		Cost(4)		Fair Value(18)


Affiliate Investments(6)

AFG Capital Group, LLC	Provider of Rent-to-Own Financing Solutions and Services
		Warrants (42 equivalent units; Expiration — November 7, 2024; Strike price — $0.01 per unit)		$	259	$	860
		Member Units (186 units)(8)			1,200		3,590

					1,459		4,450

Barfly Ventures, LLC(10)	Casual Restaurant Group
		12% Secured Debt (Maturity — August 31, 2020)	8,715		8,572		8,715
		Options (2 equivalent units)			397		920
		Warrant (1 equivalent unit; Expiration — August 31, 2025; Strike price — $1.00 per unit)			473		520

					9,442		10,155

BBB Tank Services, LLC	Maintenance, Repair and Construction Services to the Above-Ground Storage Tank Market
		LIBOR Plus 8.00% (Floor 1.00%), Current Coupon 9.36%, Secured Debt (Maturity — April 8, 2021)(9)	800		778		778
		15% Secured Debt (Maturity — April 8, 2021)	4,000		3,876		3,876
		Member Units (800,000 units)			800		500

					5,454		5,154

Boccella Precast Products LLC	Manufacturer of Precast Hollow Core Concrete
		LIBOR Plus 10.00% (Floor 1.00%), Current Coupon 11.34%, Secured Debt (Maturity — June 30, 2022)(9)	16,400		16,230		16,400
		Member Units (2,160,000 units)			2,160		3,440

					18,390		19,840

Boss Industries, LLC	Manufacturer and Distributor of Air, Power and Other Industrial Equipment
		Preferred Member Units (2,242 units)(8)			2,080		3,930

Bridge Capital Solutions Corporation	Financial Services and Cash Flow Solutions Provider
		13% Secured Debt (Maturity — July 25, 2021)	7,500		5,884		5,884
		Warrants (63 equivalent shares; Expiration — July 25, 2026; Strike price — $0.01 per share)			2,132		3,520
		13% Secured Debt (Mercury Service Group, LLC) (Maturity — July 25, 2021)	1,000		992		1,000
		Preferred Member Units (Mercury Service Group, LLC) (17,742 units)(8)			1,000		1,000

					10,008		11,404

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Buca C, LLC	Casual Restaurant Group
		LIBOR Plus 7.25% (Floor 1.00%), Current Coupon 8.63%, Secured Debt (Maturity — June 30, 2020)(9)	20,304	20,193	20,193
		Preferred Member Units (6 units; 6% cumulative)(8)(19)		4,177	4,172

				24,370	24,365

CAI Software LLC	Provider of Specialized Enterprise Resource Planning Software
		12% Secured Debt (Maturity — October 10, 2019)	4,083	4,060	4,083
		Member Units (65,356 units)(8)		654	3,230

				4,714	7,313

Chandler Signs Holdings, LLC(10)	Sign Manufacturer
		12% Secured Debt (Maturity — July 4, 2021)	4,500	4,468	4,500
		Class A Units (1,500,000 units)(8)		1,500	2,650

				5,968	7,150

Condit Exhibits, LLC	Tradeshow Exhibits / Custom Displays Provider
		Member Units (3,936 units)(8)		100	1,950

Congruent Credit Opportunities Funds(12)(13)	Investment Partnership
		LP Interests (Congruent Credit Opportunities Fund II, LP) (Fully diluted 19.8%)(8)		5,730	1,515
		LP Interests (Congruent Credit Opportunities Fund III, LP) (Fully diluted 17.4%)(8)		17,869	18,632

				23,599	20,147

Dos Rios Partners (12)(13)	Investment Partnership
		LP Interests (Dos Rios Partners, LP) (Fully diluted 20.2%)		5,996	7,165
		LP Interests (Dos Rios Partners — A, LP) (Fully diluted 6.4%)		1,904	1,889

				7,900	9,054

Dos Rios Stone Products LLC(10)	Limestone and Sandstone Dimension Cut Stone Mining Quarries
		Class A Units (2,000,000 units)(8)		2,000	1,790

East Teak Fine Hardwoods, Inc.	Distributor of Hardwood Products
		Common Stock (6,250 shares)(8)		480	630

EIG Fund Investments(12)(13)	Investment Partnership
		LP Interests (EIG Global Private Debt Fund-A, L.P.) (Fully diluted 11.1%)(8)		1,103	1,055

Freeport Financial Funds(12)(13)	Investment Partnership
		LP Interests (Freeport Financial SBIC Fund LP) (Fully diluted 9.3%)(8)		5,974	5,614
		LP Interests (Freeport First Lien Loan Fund III LP) (Fully diluted 6.0%)(8)		8,558	8,506

				14,532	14,120

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Gault Financial, LLC (RMB Capital, LLC)	Purchases and Manages Collection of Healthcare and other Business Receivables
		10.5% Secured Debt (Maturity — January 1, 2019)	12,483	12,483	11,532
		Warrants (29,032 equivalent units; Expiration — February 9, 2022; Strike price — $0.01 per unit)		400	—

				12,883	11,532

Guerdon Modular Holdings, Inc.	Multi-Family and Commercial Modular Construction Company
		13% Secured Debt (Maturity — August 13, 2019)	10,708	10,632	10,632
		Preferred Stock (404,998 shares)		1,140	—
		Common Stock (212,033 shares)		2,983	—

				14,755	10,632

Harris Preston Fund Investments(12)(13)	Investment Partnership
		LP Interests (HPEP 3, L.P.) (Fully diluted 9.9%)		943	943

Hawk Ridge Systems, LLC(13)	Value-Added Reseller of Engineering Design and Manufacturing Solutions
		11% Secured Debt (Maturity — December 2, 2021)	14,300	14,175	14,300
		Preferred Member Units (226 units)(8)		2,850	3,800
		Preferred Member Units (HRS Services, ULC) (226 units)(8)		150	200

				17,175	18,300

Houston Plating and Coatings, LLC	Provider of Plating and Industrial Coating Services
		8% Unsecured Convertible Debt (Maturity — May 1, 2022)	3,000	3,000	3,200
		Member Units (315,756 units)		2,179	6,140

				5,179	9,340

I-45 SLF LLC(12)(13)	Investment Partnership
		Member Units (Fully diluted 20.0%; 24.4% profits interest)(8)		16,200	16,841

L.F. Manufacturing Holdings, LLC(10)	Manufacturer of Fiberglass Products
		Member Units (2,179,001 units)		2,019	2,000

Meisler Operating LLC	Provider of Short-term Trailer and Container Rental
		LIBOR Plus 8.50% (Floor 1.00%), Current Coupon 9.84%, Secured Debt (Maturity — June 7, 2022)(9)	16,800	16,633	16,633
		Member Units (Milton Meisler Holdings LLC) (31,976 units)		3,200	3,390

				19,833	20,023

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


OnAsset Intelligence, Inc.	Provider of Transportation Monitoring / Tracking Products and Services
		12% PIK Secured Debt (Maturity — June 30, 2021)(19)	5,094	5,094	5,094
		10% PIK Unsecured Debt (Maturity — June 30, 2021)(19)	48	48	48
		Preferred Stock (912 shares)		1,981	—
		Warrants (5,333 equivalent shares; Expiration — April 18, 2021; Strike price — $0.01 per share)		1,919	—

				9,042	5,142
OPI International Ltd.(13)	Provider of Man Camp and Industrial Storage Services
		Common Stock (20,766,317 shares)		1,371	—

PCI Holding Company, Inc.	Manufacturer of Industrial Gas Generating Systems
		12% Secured Debt (Maturity — March 31, 2019)	12,650	12,593	12,593
		Preferred Stock (1,740,000 shares)		1,740	2,610
		Preferred Stock (1,500,000 shares; 20% cumulative)(8)(19)		3,927	890

				18,260	16,093
Rocaceia, LLC (Quality Lease and Rental Holdings, LLC)	Provider of Rigsite Accommodation Unit Rentals and Related Services
		12% Secured Debt (Maturity — January 8, 2018) (14) (15)	30,785	30,281	250
		Preferred Member Units (250 units)		2,500	—

				32,781	250

Tin Roof Acquisition Company	Casual Restaurant Group
		12% Secured Debt (Maturity — November 13, 2018)	12,783	12,722	12,722
		Class C Preferred Stock (Fully diluted 10.0%; 10% cumulative)(8)(19)		3,027	3,027

				15,749	15,749

UniTek Global Services, Inc.(11)	Provider of Outsourced Infrastructure Services
		LIBOR Plus 8.50% (Floor 1.00%), Current Coupon 10.20%, Secured Debt (Maturity — January 13, 2019)(9)	8,535	8,529	8,535
		LIBOR Plus 7.50% (Floor 1.00%), Current Coupon 9.20% / 1.00% PIK, Current Coupon Plus PIK 10.20%, Secured Debt (Maturity — January 13, 2019)(9)(19)	137	137	137
		15% PIK Unsecured Debt (Maturity — July 13, 2019)(19)	865	865	865
		Preferred Stock (2,596,567 shares; 19% cumulative)(8)(19)		2,858	2,850
		Preferred Stock (4,935,377 shares; 13.5% cumulative)(8)(19)		7,361	7,320
		Common Stock (1,075,992 shares)		—	2,490

				19,750	22,197

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)		Cost(4)		Fair Value(18)


Universal Wellhead Services Holdings, LLC(10)	Provider of Wellhead Equipment, Designs, and Personnel to the Oil & Gas Industry
		Preferred Member Units (UWS Investments, LLC) (716,949 units)			717		830
		Member Units (UWS Investments, LLC) (4,000,000 units)			4,000		1,910

					4,717		2,740
Valley Healthcare Group, LLC	Provider of Durable Medical Equipment
		LIBOR Plus 12.50% (Floor 0.50%), Current Coupon 13.86%, Secured Debt (Maturity — December 29, 2020)(9)	11,766		11,685		11,685
		Preferred Member Units (Valley Healthcare Holding, LLC) (1,600 units)			1,600		1,600

					13,285		13,285

Volusion, LLC	Provider of Online Software-as-a-Service eCommerce Solutions
		11.5% Secured Debt (Maturity — January 26, 2020)	16,734		15,200		15,200
		Preferred Member Units (4,876,670 units)			14,000		14,000
		Warrants (1,831,355 equivalent units; Expiration — January 26, 2025; Strike price — $0.01 per unit)			2,576		2,080

					31,776		31,280

Subtotal Affiliate Investments (15.6% of total investments at fair value)				$	367,317	$	338,854

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)	Principal(4)		Cost(4)		Fair Value(18)


Non-Control/Non-Affiliate Investments(7)

AAC Holdings, Inc.(11)	Substance Abuse Treatment Service Provider
		LIBOR Plus 6.75% (Floor 1.00%), Current Coupon 8.13%, Secured Debt (Maturity — June 30, 2023)(9)	$	11,751	$	11,475	$	11,810

Adams Publishing Group, LLC(10)	Local Newspaper Operator
		LIBOR Plus 7.00% (Floor 1.00%), Current Coupon 8.69%, Secured Debt (Maturity — November 3, 2020)(9)		10,341		10,116		10,147

ADS Tactical, Inc.(10)	Value-Added Logistics and Supply Chain Provider to the Defense Industry
		LIBOR Plus 7.50% (Floor 0.75%), Current Coupon 9.19%, Secured Debt (Maturity — December 31, 2022)(9)		13,014		12,767		12,833

Aethon United BR LP(10)	Oil & Gas Exploration & Production
		LIBOR Plus 6.75% (Floor 1.00%), Current Coupon 8.15%, Secured Debt (Maturity — September 8, 2023)(9)		3,438		3,388		3,388

Ahead, LLC(10)	IT Infrastructure Value Added Reseller
		LIBOR Plus 6.50%, Current Coupon 8.20%, Secured Debt (Maturity — November 2, 2020)		11,061		10,848		11,130

Allflex Holdings III Inc.(11)	Manufacturer of Livestock Identification Products
		LIBOR Plus 7.00% (Floor 1.00%), Current Coupon 8.36%, Secured Debt (Maturity — July 19, 2021)(9)		13,846		13,781		13,955

American Scaffold Holdings, Inc.(10)	Marine Scaffolding Service Provider
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 8.19%, Secured Debt (Maturity — March 31, 2022)(9)		7,031		6,947		6,996

American Teleconferencing Services, Ltd.(11)	Provider of Audio Conferencing and Video Collaboration Solutions
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 7.90%, Secured Debt (Maturity — December 8, 2021)(9)		10,582		9,934		10,443
		LIBOR Plus 9.50% (Floor 1.00%), Current Coupon 10.85%, Secured Debt (Maturity — June 6, 2022)(9)		3,714		3,589		3,507

						13,523		13,950

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Anchor Hocking, LLC(11)	Household Products Manufacturer
		LIBOR Plus 9.00% (Floor 1.00%), Current Coupon 10.49%, Secured Debt (Maturity — June 4, 2020)(9)	2,254	2,211	2,248
		Member Units (440,620 units)		4,928	3,745

				7,139	5,993

Apex Linen Service, Inc.	Industrial Launderers
		LIBOR Plus 9.00% (Floor 1.00%), Current Coupon 10.36%, Secured Debt (Maturity — October 30, 2022)(9)	2,400	2,400	2,400
		16% Secured Debt (Maturity — October 30, 2022)	14,416	14,347	14,347

				16,747	16,747

Arcus Hunting LLC.(10)	Manufacturer of Bowhunting and Archery Products and Accessories
		LIBOR Plus 7.00% (Floor 1.00%), Current Coupon 8.34%, Secured Debt (Maturity — November 13, 2019)(9)	15,391	15,294	15,391

ATI Investment Sub, Inc.(11)	Manufacturer of Solar Tracking Systems
		LIBOR Plus 7.25% (Floor 1.00%), Current Coupon 8.82%, Secured Debt (Maturity — June 22, 2021)(9)	7,364	7,215	7,346

ATX Networks Corp.(11)(13)(21)	Provider of Radio Frequency Management Equipment
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.33% / 1.00% PIK, Current Coupon Plus PIK 8.33%, Secured Debt (Maturity — June 11, 2021)(9)(19)	9,567	9,454	9,507

Berry Aviation, Inc.(10)	Airline Charter Service Operator
		13.75% Secured Debt (Maturity — January 30, 2020)	5,627	5,598	5,627
		Common Stock (553 shares)		400	1,010

				5,998	6,637

BigName Commerce, LLC(10)	Provider of Envelopes and Complimentary Stationery Products
		LIBOR Plus 7.25% (Floor 1.00%), Current Coupon 8.59%, Secured Debt (Maturity — May 11, 2022)(9)	2,488	2,461	2,461

Binswanger Enterprises, LLC(10)	Glass Repair and Installation Service Provider
		LIBOR Plus 8.00% (Floor 1.00%), Current Coupon 9.69%, Secured Debt (Maturity — March 9, 2022)(9)	15,325	15,060	15,192
		Member Units (1,050,000 units)		1,050	1,000

				16,110	16,192

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Bluestem Brands, Inc.(11)	Multi-Channel Retailer of General Merchandise
		LIBOR Plus 7.50% (Floor 1.00%), Current Coupon 9.07%, Secured Debt (Maturity — November 6, 2020)(9)	12,127	11,955	8,540

Brainworks Software, LLC(10)	Advertising Sales and Newspaper Circulation Software
		Prime Plus 9.25% (Floor 3.25%), Current Coupon 13.75%, Secured Debt (Maturity — July 22, 2019)(9)	6,733	6,705	6,573

Brightwood Capital Fund Investments(12)(13)	Investment Partnership
		LP Interests (Brightwood Capital Fund III, LP) (Fully diluted 1.6%)(8)		12,000	10,328
		LP Interests (Brightwood Capital Fund IV, LP) (Fully diluted 0.8%)(8)		1,000	1,063

				13,000	11,391

Brundage-Bone Concrete Pumping, Inc.(11)	Construction Services Provider
		10.375% Secured Debt (Maturity — September 1, 2023)	3,000	2,987	3,180

Cadence Aerospace LLC(10)	Aerostructure Manufacturing
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 7.91%, Secured Debt (Maturity — November 14, 2023)(9)	15,000	14,853	14,853

CapFusion, LLC(13)	Non-Bank Lender to Small Businesses
		13% Secured Debt (Maturity — March 25, 2021)(14)	6,705	5,645	1,871

California Pizza Kitchen, Inc.(11)	Casual Restaurant Group
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.57%, Secured Debt (Maturity — August 23, 2022)(9)	12,902	12,862	12,677

CDHA Management, LLC(10)	Dental Services
		LIBOR Plus 7.25% (Floor 1.00%), Current Coupon 8.76%, Secured Debt (Maturity — December 5, 2021)(9)	5,365	5,303	5,365

Central Security Group, Inc.(11)	Security Alarm Monitoring Service Provider
		LIBOR Plus 5.63% (Floor 1.00%), Current Coupon 7.19%, Secured Debt (Maturity — October 6, 2021)(9)	7,481	7,462	7,518

Cenveo Corporation(11)	Provider of Commercial Printing, Envelopes, Labels, and Printed Office Products
		6% Secured Debt (Maturity — August 1, 2019)	19,130	17,126	13,582

Charlotte Russe, Inc(11)	Fast-Fashion Retailer to Young Women
		LIBOR Plus 5.50% (Floor 1.25%), Current Coupon 6.89%, Secured Debt (Maturity — May 22, 2019)(9)	19,041	16,473	7,807

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Clarius BIGS, LLC(10)	Prints & Advertising Film Financing
		15% PIK Secured Debt (Maturity — January 5, 2015)(14)(17)	2,924	2,924	85

Clickbooth.com, LLC(10)	Provider of Digital Advertising Performance Marketing Solutions
		LIBOR Plus 8.50% (Floor 1.00%), Current Coupon 10.01%, Secured Debt (Maturity — December 5, 2022)(9)	3,000	2,941	2,941

Construction Supply Investments, LLC(10)	Distribution Platform of Specialty Construction Materials to Professional Concrete and Masonry Contractors
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.57%, Secured Debt (Maturity — June 30, 2023)(9)	7,125	7,090	7,090
		Member Units (28,000 units)		3,723	3,723

				10,813	10,813

CTVSH, PLLC(10)	Emergency Care and Specialty Service Animal Hospital
		LIBOR Plus 8.00% (Floor 1.00%), Current Coupon 9.48%, Secured Debt (Maturity — August 3, 2022)(9)	11,850	11,739	11,739

Darr Equipment LP(10)	Heavy Equipment Dealer
		11.5% Current / 1% PIK Secured Debt (Maturity - June 22, 2023)(19)	7,229	7,229	7,229
		Warrants (915,734 equivalent units; Expiration — December 23, 2023; Strike price — $1.50 per unit)		474	10

				7,703	7,239

Digital River, Inc.(11)	Provider of Outsourced e-Commerce Solutions and Services
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 8.08%, Secured Debt (Maturity — February 12, 2021)(9)	9,313	9,266	9,337

Drilling Info Holdings, Inc.	Information Services for the Oil and Gas Industry
		Common Stock (3,788,865 shares)(8)		—	8,610

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


EnCap Energy Fund Investments(12)(13)	Investment Partnership
		LP Interests (EnCap Energy Capital Fund VIII, L.P.) (Fully diluted 0.1%)(8)		3,906	2,202
		LP Interests (EnCap Energy Capital Fund VIII Co-Investors, L.P.) (Fully diluted 0.4%)		2,227	1,549
		LP Interests (EnCap Energy Capital Fund IX, L.P.) (Fully diluted 0.1%)(8)		4,305	3,720
		LP Interests (EnCap Energy Capital Fund X, L.P.) (Fully diluted 0.1%)(8)		6,277	6,225
		LP Interests (EnCap Flatrock Midstream Fund II, L.P.) (Fully diluted 0.8%)(8)		6,138	6,116
		LP Interests (EnCap Flatrock Midstream Fund III, L.P.) (Fully diluted 0.2%)		3,458	3,828

				26,311	23,640

Evergreen Skills Lux S.á r.l. (d/b/a Skillsoft)(11)(13)	Technology-based Performance Support Solutions
		LIBOR Plus 8.25% (Floor 1.00%), Current Coupon 9.82%, Secured Debt (Maturity — April 28, 2022)(9)	6,999	6,878	6,244

Extreme Reach, Inc.(11)	Integrated TV and Video Advertising Platform
		LIBOR Plus 6.25% (Floor 1.00%), Current Coupon 7.95%, Secured Debt (Maturity — February 7, 2020)(9)	10,411	10,397	10,398

Felix Investments Holdings II(10)	Oil & Gas Exploration & Production
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 7.90%, Secured Debt (Maturity — August 9, 2022)(9)	3,333	3,267	3,267

Flavors Holdings Inc.(11)	Global Provider of Flavoring and Sweetening Products
		LIBOR Plus 5.75% (Floor 1.00%), Current Coupon 7.44%, Secured Debt (Maturity — April 3, 2020)(9)	13,076	12,616	12,128

GI KBS Merger Sub LLC(11)	Outsourced Janitorial Services to Retail/Grocery Customers
		LIBOR Plus 5.00% (Floor 1.00%), Current Coupon 6.48%, Secured Debt (Maturity — October 29, 2021)(9)	6,807	6,733	6,833
		LIBOR Plus 8.50% (Floor 1.00%), Current Coupon 9.88%, Secured Debt (Maturity — April 29, 2022)(9)	3,915	3,769	3,793

				10,502	10,626

GoWireless Holdings, Inc.(11)	Provider of Wireless Telecommunications Carrier Services
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 8.16%, Secured Debt (Maturity — December 22, 2024)(9)	18,000	17,820	17,865

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Grace Hill, LLC(10)	Online Training Tools for the Multi-Family Housing Industry
		Prime Plus 5.25% (Floor 1.00%), Current Coupon 9.75%, Secured Debt (Maturity — August 15, 2019)(9)	1,215	1,208	1,215
		LIBOR Plus 6.25% (Floor 1.00%), Current Coupon 7.58%, Secured Debt (Maturity — August 15, 2019)(9)	11,407	11,356	11,407

				12,564	12,622

Great Circle Family Foods, LLC(10)	Quick Service Restaurant Franchise
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.34%, Secured Debt (Maturity — October 28, 2019)(9)	7,219	7,187	7,219

Grupo Hima San Pablo, Inc.(11)	Tertiary Care Hospitals
		LIBOR Plus 7.00% (Floor 1.50%), Current Coupon 8.50%, Secured Debt (Maturity — January 31, 2018)(9)	4,750	4,748	3,541
		13.75% Secured Debt (Maturity — July 31, 2018)	2,055	2,040	226

				6,788	3,767

GST Autoleather, Inc.(11)	Automotive Leather Manufacturer
		PRIME Plus 6.50% (Floor 2.25%), Current Coupon 11.00%, Secured Debt (Maturity — April 5, 2018)(9)	7,578	7,500	7,500
		PRIME Plus 6.50% (Floor 2.00%), Current Coupon 11.00%, Secured Debt (Maturity — July 10, 2020)(9)	15,619	15,120	11,813

				22,620	19,313

Guitar Center, Inc.(11)	Musical Instruments Retailer
		6.5% Secured Debt (Maturity — April 15, 2019)	16,625	16,009	15,378

Hojeij Branded Foods, LLC(10)	Multi-Airport, Multi- Concept Restaurant Operator
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.57%, Secured Debt (Maturity — July 20, 2022)(9)	12,137	12,022	12,137

Hoover Group, Inc.(10)(13)	Provider of Storage Tanks and Related Products to the Energy and Petrochemical Markets
		LIBOR Plus 7.25% (Floor 1.00%), Current Coupon 8.70%, Secured Debt (Maturity — January 28, 2021)(9)	8,460	7,986	7,783

Hostway Corporation(11)	Managed Services and Hosting Provider
		LIBOR Plus 6.75% (Floor 1.25%), Current Coupon 8.44%, Secured Debt (Maturity — December 13, 2019)(9)	20,150	19,796	19,621
		LIBOR Plus 6.75% (Floor 1.25%), Current Coupon 8.44%, Secured Debt (Maturity — December 13, 2018)(9)	12,406	11,575	11,692

				31,371	31,313

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Hunter Defense Technologies, Inc.(11)	Provider of Military and Commercial Shelters and Systems
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.70%, Secured Debt (Maturity — August 5, 2019)(9)	20,224	19,851	19,997

Hydrofarm Holdings LLC(10)	Wholesaler of Horticultural Products
		LIBOR Plus 7.00%, Current Coupon 8.49%, Secured Debt (Maturity — May 12, 2022)	6,708	6,588	6,699

iEnergizer Limited(11)(13)(21)	Provider of Business Outsourcing Solutions
		LIBOR Plus 6.00% (Floor 1.25%), Current Coupon 7.57%, Secured Debt (Maturity — May 1, 2019)(9)	11,005	10,764	10,977

Implus Footcare, LLC(10)	Provider of Footwear and Related Accessories
		LIBOR Plus 6.75% (Floor 1.00%), Current Coupon 8.44%, Secured Debt (Maturity — April 30, 2021)(9)	19,372	19,115	19,243

Indivior Finance LLC(11)(13)	Specialty Pharmaceutical Company Treating Opioid Dependence
		LIBOR Plus 4.50% (Floor 1.00%), Current Coupon 5.50%, Secured Debt (Maturity — December 18, 2022)(9)	1,176	1,171	1,182

Industrial Services Acquisition, LLC(10)	Industrial Cleaning Services
		11.25% Current / 0.75% PIK Unsecured Debt (Maturity — December 17, 2022)(19)	4,553	4,478	4,553
		Member Units (Industrial Services Investments, LLC) (900,000 units)		900	810

				5,378	5,363

Inn of the Mountain Gods Resort and Casino(11)	Hotel & Casino Owner & Operator
		9.25% Secured Debt (Maturity — November 30, 2020)	6,249	5,994	5,687

iPayment, Inc.(11)	Provider of Merchant Acquisition
		LIBOR Plus 5.00% (Floor 1.00%), Current Coupon 6.62%, Secured Debt (Maturity — April 11, 2023)(9)	11,970	11,861	12,090

iQor US Inc.(11)	Business Process Outsourcing Services Provider
		LIBOR Plus 5.00% (Floor 1.00%), Current Coupon 6.69%, Secured Debt (Maturity — April 1, 2021)(9)	990	983	986

irth Solutions, LLC	Provider of Damage Prevention Information Technology Services
		Member Units (27,893 units)		1,441	1,920

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Jacent Strategic Merchandising, LLC(10)	General Merchandise Distribution
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 8.01%, Secured Debt (Maturity — September 16, 2020)(9)	11,110	11,054	11,110

Jackmont Hospitality, Inc.(10)	Franchisee of Casual Dining Restaurants
		LIBOR Plus 6.75% (Floor 1.00%), Current Coupon 8.32%, Secured Debt (Maturity — May 26, 2021)(9)	4,390	4,379	4,390

Jacuzzi Brands LLC(11)	Manufacturer of Bath and Spa Products
		LIBOR Plus 7.00% (Floor 1.00%), Current Coupon 8.69%, Secured Debt (Maturity — June 28, 2023)(9)	3,950	3,876	3,980

Joerns Healthcare, LLC(11)	Manufacturer and Distributor of Health Care Equipment & Supplies
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.48% Secured Debt (Maturity — May 9, 2020)(9)	13,387	13,299	12,472

Keypoint Government Solutions, Inc.(10)	Provider of Pre-Employment Screening Services
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.35%, Secured Debt (Maturity — April 18, 2024)(9)	12,031	11,921	12,031

Larchmont Resources, LLC(11)	Oil & Gas Exploration & Production
		LIBOR Plus 9.00% (Floor 1.00%), Current Coupon 10.53%, PIK Secured Debt (Maturity — August 7, 2020)(9)(19)	2,418	2,418	2,394
		Member Units (Larchmont Intermediate Holdco, LLC) (2,828 units)		353	976

				2,771	3,370

LKCM Headwater Investments I, L.P.(12)(13)	Investment Partnership
		LP Interests (Fully diluted 2.3%)		2,500	4,234

Logix Acquisition Company, LLC(10)	Competitive Local Exchange Carrier
		LIBOR Plus 5.75% (Floor 1.00%), Current Coupon 7.28%, Secured Debt (Maturity — August 9, 2024)(9)	10,135	9,921	9,921

Looking Glass Investments, LLC(12)(13)	Specialty Consumer Finance
		Member Units (2.5 units)		125	57
		Member Units (LGI Predictive Analytics LLC) (190,712 units)(8)		108	92

				233	149

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


LSF9 Atlantis Holdings, LLC(11)	Provider of Wireless Telecommunications Carrier Services
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.57%, Secured Debt (Maturity — May 1, 2023)(9)	2,963	2,931	2,978

Lulu's Fashion Lounge, LLC(10)	Fast Fashion E-Commerce Retailer
		LIBOR Plus 7.00% (Floor 1.00%), Current Coupon 8.57%, Secured Debt (Maturity — August 28, 2022)(9)	13,381	12,993	13,531

Messenger, LLC(10)	Supplier of Specialty Stationery and Related Products to the Funeral Industry
		LIBOR Plus 7.25% (Floor 1.00%), Current Coupon 8.74%, Secured Debt (Maturity — September 9, 2020)(9)	17,331	17,249	17,331

Minute Key, Inc.	Operator of Automated Key Duplication Kiosks
		Warrants (1,437,409 equivalent shares; Expiration — May 20, 2025; Strike price — $0.01 per share)		280	1,170

NBG Acquisition Inc(11)	Wholesaler of Home Décor Products
		LIBOR Plus 5.50% (Floor 1.00%), Current Coupon 7.19%, Secured Debt (Maturity — April 26, 2024)(9)	4,402	4,336	4,452

New Media Holdings II LLC(11)(13)	Local Newspaper Operator
		LIBOR Plus 6.25% (Floor 1.00%), Current Coupon 7.82%, Secured Debt (Maturity — July 14, 2022)(9)	17,715	17,342	17,864

NNE Partners, LLC(10)	Oil & Gas Exploration & Production
		LIBOR Plus 8.00%, Current Coupon 9.49%, Secured Debt (Maturity — March 2, 2022)	11,958	11,854	11,854

North American Lifting Holdings, Inc.(11)	Crane Service Provider
		LIBOR Plus 4.50% (Floor 1.00%), Current Coupon 6.19%, Secured Debt (Maturity — November 27, 2020)(9)	7,745	6,913	7,256

Novetta Solutions, LLC(11)	Provider of Advanced Analytics Solutions for Defense Agencies
		LIBOR Plus 5.00% (Floor 1.00%), Current Coupon 6.70%, Secured Debt (Maturity — October 17, 2022)(9)	14,636	14,189	14,239

NTM Acquisition Corp.(11)	Provider of B2B Travel Information Content
		LIBOR Plus 6.25% (Floor 1.00%), Current Coupon 7.94%, Secured Debt (Maturity — June 7, 2022)(9)	6,186	6,126	6,155

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Ospemifene Royalty Sub LLC (QuatRx)(10)	Estrogen-Deficiency Drug Manufacturer and Distributor
		11.5% Secured Debt (Maturity — November 15, 2026)(14)	5,071	5,071	1,198

P.F. Chang's China Bistro, Inc.(11)	Casual Restaurant Group
		LIBOR Plus 5.00% (Floor 1.00%), Current Coupon 6.51%, Secured Debt (Maturity — September 1, 2022)(9)	4,988	4,846	4,715

Paris Presents Incorporated(11)	Branded Cosmetic and Bath Accessories
		LIBOR Plus 8.75% (Floor 1.00%), Current Coupon 10.32%, Secured Debt (Maturity — December 31, 2021)(9)	4,500	4,471	4,477

Parq Holdings Limited Partnership(11)(13)(21)	Hotel & Casino Operator
		LIBOR Plus 7.50% (Floor 1.00%), Current Coupon 9.19%, Secured Debt (Maturity — December 17, 2020)(9)	7,481	7,399	7,528

Permian Holdco 2, Inc.(11)	Storage Tank Manufacturer
		14% PIK Unsecured Debt (Maturity — October 15, 2021)(19)	306	306	306
		Preferred Stock (Permian Holdco 1, Inc.) (154,558 units)		799	980
		Common Stock (Permian Holdco 1, Inc.) (154,558 units)		—	140

				1,105	1,426

Pernix Therapeutics Holdings, Inc.(10)	Pharmaceutical Royalty
		12% Secured Debt (Maturity — August 1, 2020)	3,129	3,129	1,971

Point.360(10)	Fully Integrated Provider of Digital Media Services
		Warrants (65,463 equivalent shares; Expiration — July 7, 2020; Strike price — $0.75 per share)		69	—
		Common Stock (163,658 shares)		273	11

				342	11

PPC/SHIFT LLC(10)	Provider of Digital Solutions to Automotive Industry
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.69%, Secured Debt (Maturity — December 22, 2021)(9)	6,869	6,748	6,869

Prowler Acquisition Corp.(11)	Specialty Distributor to the Energy Sector
		LIBOR Plus 4.50% (Floor 1.00%), Current Coupon 6.19%, Secured Debt (Maturity — January 28, 2020)(9)	12,830	11,332	12,253

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


PT Network, LLC(10)	Provider of Outpatient Physical Therapy and Sports Medicine Services
		LIBOR Plus 5.50% (Floor 1.00%), Current Coupon 6.86%, Secured Debt (Maturity — November 30, 2021)(9)	8,553	8,553	8,553

QBS Parent, Inc.(11)	Provider of Software and Services to the Oil & Gas Industry
		LIBOR Plus 4.75% (Floor 1.00%), Current Coupon 6.13%, Secured Debt (Maturity — August 7, 2021)(9)	14,272	14,114	14,165

Research Now Group, Inc. and Survey Sampling International, LLC(11)	Provider of Outsourced Online Surveying
		LIBOR Plus 5.50% (Floor 1.00%), Current Coupon 7.13%, Secured Debt (Maturity — December 20, 2024)(9)	13,500	12,826	12,826

Resolute Industrial, LLC(10)	HVAC Equipment Rental and Remanufacturing
		LIBOR Plus 7.62% (Floor 1.00%), Current Coupon 8.95%, Secured Debt (Maturity — July 26, 2022)(9)(25)	17,088	16,770	16,770
		Member Units (601 units)		750	750

				17,520	17,520

RGL Reservoir Operations Inc.(11)(13)(21)	Oil & Gas Equipment and Services
		1% Current / 9% PIK Secured Debt (Maturity — December 21, 2024)(19)	721	407	407

RM Bidder, LLC(10)	Scripted and Unscripted TV and Digital Programming Provider
		Warrants (327,532 equivalent units; Expiration — October 20, 2025; Strike price — $14.28 per unit)		425	—
		Member Units (2,779 units)		46	20

				471	20

SAFETY Investment Holdings, LLC	Provider of Intelligent Driver Record Monitoring Software and Services
		Member Units (2,000,000 units)		2,000	1,670

Salient Partners L.P.(11)	Provider of Asset Management Services
		LIBOR Plus 8.50% (Floor 1.00%), Current Coupon 9.85%, Secured Debt (Maturity — June 9, 2021)(9)	10,081	9,870	9,778

SiTV, LLC(11)	Cable Networks Operator
		10.375% Secured Debt (Maturity — July 1, 2019)	10,429	7,006	7,040

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


SMART Modular Technologies, Inc.(10)(13)	Provider of Specialty Memory Solutions
		LIBOR Plus 6.25% (Floor 1.00%), Current Coupon 7.66%, Secured Debt (Maturity — August 9, 2022)(9)	14,625	14,351	14,552

Sorenson Communications, Inc.(11)	Manufacturer of Communication Products for Hearing Impaired
		LIBOR Plus 5.75% (Floor 2.25%), Current Coupon 8.00%, Secured Debt (Maturity — April 30, 2020)(9)	13,234	13,170	13,341

Staples Canada ULC(10)(13)(21)	Office Supplies Retailer
		LIBOR Plus 7.00% (Floor 1.00%), Current Coupon 8.43%, Secured Debt (Maturity — September 12, 2023)(9)(22)	20,000	19,617	18,891

Strike, LLC(11)	Pipeline Construction and Maintenance Services
		LIBOR Plus 8.00% (Floor 1.00%), Current Coupon 9.50%, Secured Debt (Maturity — November 30, 2022)(9)	9,500	9,250	9,643
		LIBOR Plus 8.00% (Floor 1.00%), Current Coupon 9.45%, Secured Debt (Maturity — May 30, 2019)(9)	2,500	2,479	2,513

				11,729	12,156

Subsea Global Solutions, LLC(10)	Underwater Maintenance and Repair Services
		LIBOR Plus 6.00% (Floor 1.50%), Current Coupon 7.50%, Secured Debt (Maturity — March 17, 2020)(9)	7,687	7,637	7,687

Synagro Infrastructure Company, Inc(11)	Waste Management Services
		LIBOR Plus 5.50% (Floor 1.00%), Current Coupon 7.19%, Secured Debt (Maturity — August 22, 2020)(9)	9,161	8,933	8,608

Tectonic Holdings, LLC	Financial Services Organization
		Member Units (200,000 units)(8)		2,000	2,320

TE Holdings, LLC(11)	Oil & Gas Exploration & Production
		Member Units (97,048 units)		970	158

TeleGuam Holdings, LLC(11)	Cable and Telecom Services Provider
		LIBOR Plus 8.50% (Floor 1.00%), Current Coupon 10.07%, Secured Debt (Maturity — April 12, 2024)(9)	7,750	7,602	7,808

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


TGP Holdings III LLC(11)	Outdoor Cooking & Accessories
		LIBOR Plus 5.00% (Floor 1.00%), Current Coupon 6.69%, Secured Debt (Maturity — September 25, 2024)(9)	6,898	6,820	6,969
		LIBOR Plus 8.50% (Floor 1.00%), Current Coupon 10.19%, Secured Debt (Maturity — September 25, 2025)(9)	5,000	4,927	5,075

				11,747	12,044

The Container Store, Inc.(11)	Operator of Stores Offering Storage and Organizational Products
		LIBOR Plus 7.00% (Floor 1.00%), Current Coupon 8.69%, Secured Debt (Maturity — August 15, 2021)(9)	9,938	9,660	9,652

TMC Merger Sub Corp.(11)	Refractory & Maintenance Services Provider
		LIBOR Plus 6.25% (Floor 1.00%), Current Coupon 7.88%, Secured Debt (Maturity — October 31, 2022)(9)(26)	17,653	17,516	17,741

TOMS Shoes, LLC(11)	Global Designer, Distributor, and Retailer of Casual Footwear
		LIBOR Plus 5.50% (Floor 1.00%), Current Coupon 6.98%, Secured Debt (Maturity — October 30, 2020)(9)	4,875	4,610	2,901

Turning Point Brands, Inc.(10)(13)	Marketer/Distributor of Tobacco Products
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.61%, Secured Debt (Maturity — May 17, 2022)(9)(25)	8,436	8,364	8,605

TVG-I-E CMN ACQUISITION, LLC(10)	Organic Lead Generation for Online Postsecondary Schools
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.56%, Secured Debt (Maturity — November 3, 2021)(9)	8,170	8,031	8,170

Tweddle Group, Inc.(11)	Provider of Technical Information Services to Automotive OEMs
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.38%, Secured Debt (Maturity — October 21, 2022)(9)	6,114	6,011	6,023

U.S. TelePacific Corp.(11)	Provider of Communications and Managed Services
		LIBOR Plus 5.00% (Floor 1.00%), Current Coupon 6.69%, Secured Debt (Maturity — May 2, 2023)(9)	20,703	20,507	19,862

US Joiner Holding Company(11)	Marine Interior Design and Installation
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.70%, Secured Debt (Maturity — April 16, 2020)(9)	13,465	13,366	13,398

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)		Cost(4)		Fair Value(18)


VIP Cinema Holdings, Inc.(11)	Supplier of Luxury Seating to the Cinema Industry
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.70%, Secured Debt (Maturity — March 1, 2023)(9)	7,700		7,666		7,777

Vistar Media, Inc.(10)	Operator of Digital Out-of-Home Advertising Platform
		LIBOR Plus 10.00% (Floor 1.00%), Current Coupon 11.69%, Secured Debt (Maturity — February 16, 2022)(9)	3,319		3,048		3,102
		Warrants (70,207 equivalent shares; Expiration — February 17, 2027; Strike price — $0.01 per share)			331		499

					3,379		3,601

Wellnext, LLC(10)	Manufacturer of Supplements and Vitamins
		LIBOR Plus 10.10% (Floor 1.00%), Current Coupon 11.67%, Secured Debt (Maturity — July 21, 2022)(9)(23)	9,930		9,857		9,930

Wireless Vision Holdings, LLC(10)	Provider of Wireless Telecommunications Carrier Services
		LIBOR Plus 8.91% (Floor 1.00%), Current Coupon 10.27%, Secured Debt (Maturity — September 29, 2022)(9)(24)	12,932		12,654		12,654

Wirepath LLC(11)	E-Commerce Provider into Connected Home Market
		LIBOR Plus 5.25% (Floor 1.00%), Current Coupon 6.87%, Secured Debt (Maturity — August 5, 2024)(9)	4,988		4,964		5,055

Zilliant Incorporated	Price Optimization and Margin Management Solutions
		Preferred Stock (186,777 shares)			154		260
		Warrants (952,500 equivalent shares; Expiration — June 15, 2022; Strike price — $0.001 per share)			1,071		1,189

					1,225		1,449

Subtotal Non-Control/Non-Affiliate Investments (49.8% of total investments at fair value)				$	1,107,447	$	1,081,745

Total Portfolio Investments, December 31, 2017				$	2,004,798	$	2,171,305

(6): Affiliate investments are defined by the 1940 Act as investments in which between 5% and 25% of the voting securities are owned and the investments are not classified as Control investments.
(7): Non-Control/Non-Affiliate investments are defined by the 1940 Act as investments that are neither Control investments nor Affiliate investments.
(8): Income producing through dividends or distributions.
(9): Index based floating interest rate is subject to contractual minimum interest rate. A majority of the variable rate loans in the Company's investment portfolio bear interest at a rate that may be determined by reference to either LIBOR or an alternate Base Rate (commonly based on the Federal Funds Rate or the Prime Rate), which typically resets semi-annually, quarterly, or monthly at the borrower's option. The borrower may also elect to have multiple interest reset periods for each loan. For each such loan, the Company has provided the weighted average annual stated interest rate in effect at December 31, 2017. As noted in this schedule, 67% of the loans (based on the par amount) contain LIBOR floors which range between 0.50% and 2.25%, with a weighted-average LIBOR floor of approximately 1.02%.
(10): Private Loan portfolio investment. See Note B for a description of Private Loan portfolio investments.
(11): Middle Market portfolio investment. See Note B for a description of Middle Market portfolio investments.
(12): Other Portfolio investment. See Note B for a description of Other Portfolio investments.
(13): Investment is not a qualifying asset as defined under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70% of total assets at the time of acquisition of any additional non-qualifying assets.
(14): Non-accrual and non-income producing investment.
(15): Portfolio company is in a bankruptcy process and, as such, the maturity date of our debt investments in this portfolio company will not be finally determined until such process is complete. As noted in footnote (14), our debt investments in this portfolio company are on non-accrual status.
(16): External Investment Manager. Investment is not encumbered as security for the Company's Credit Agreement or in support of the SBA-guaranteed debentures issued by the Funds.
(17): Maturity date is under on-going negotiations with the portfolio company and other lenders, if applicable.
(18): Investment fair value was determined using significant unobservable inputs, unless otherwise noted. See Note C for further discussion.
(19): PIK interest income and cumulative dividend income represent income not paid currently in cash.
(20): All portfolio company headquarters are based in the United States, unless otherwise noted.
(21): Portfolio company headquarters are located outside of the United States.
(22): In connection with the Company's debt investment in Staples Canada ULC to help mitigate any potential adverse change in foreign exchange rates during the term of the Company's investment, the Company entered into a forward foreign currency contract with Cadence Bank to lend $24.2 million Canadian Dollars and receive $20.0 million U.S. Dollars with a settlement date of September 12, 2018. The unrealized appreciation on the forward foreign currency contract is $0.7 million as of December 31, 2017. This unrealized appreciation is offset by the foreign currency translation depreciation on the investment.
(23): The Company has entered into an intercreditor agreement that entitles the Company to the "last out" tranche of the first lien secured loans, whereby the "first out" tranche will receive priority as to the "last out" tranche with respect to payments of principal, interest, and any other amounts due thereunder. Therefore, the Company receives a higher interest rate than the contractual stated interest rate of LIBOR plus 7.50% (Floor 1.00%) per the Credit Agreement and the Consolidated Schedule of Investments above reflects such higher rate.
(24): The Company has entered into an intercreditor agreement that entitles the Company to the "last out" tranche of the first lien secured loans, whereby the "first out" tranche will receive priority as to the "last out" tranche with respect to payments of principal, interest, and any other amounts due thereunder. Therefore, the Company receives a higher interest rate than the contractual stated interest rate of LIBOR plus 8.50% (Floor 1.00%) per the Credit Agreement and the Consolidated Schedule of Investments above reflects such higher rate.
(25): As part of the credit agreement with the portfolio company, the Company is entitled to the "last out" tranche of the first lien secured loans, whereby the "first out" tranche receives priority over the "last out" tranche with respect to payments of principal, interest, and any other amounts due thereunder. The rate the Company receives per the Credit Agreement is the same as the rate reflected in the Consolidated Schedule of Investments above.
(26): The Company has entered into an intercreditor agreement that entitles the Company to the "first out" tranche of the first lien secured loans, whereby the "first out" tranche will receive priority as to the "last out" tranche with respect to payments of principal, interest, and any other amounts due thereunder. Therefore, the Company receives a lower interest rate than the contractual stated interest rate of LIBOR plus 6.64% (Floor 1.00%) per the Credit Agreement and the Consolidated Schedule of Investments above reflects such lower rate.

MAIN STREET CAPITAL CORPORATION

Consolidated Schedule of Investments

December 31, 2016
(dollars in thousands)

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)	Principal(4)		Cost(4)		Fair Value(18)


Control Investments(5)

Access Media Holdings, LLC(10)	Private Cable Operator
		5% Current / 5% PIK Secured Debt (Maturity — July 22, 2020)(19)	$	22,664	$	22,664	$	19,700
		Preferred Member Units (6,581,250 units)				6,475		240
		Member Units (45 units)				1		—

						29,140		19,940

Ameritech College Operations, LLC	For-Profit Nursing and Healthcare College
		10% Secured Debt (Maturity — November 30, 2019)		514		514		514
		13% Secured Debt (Maturity — November 30, 2019)		489		489		489
		13% Secured Debt (Maturity — January 31, 2020)		3,025		3,025		3,025
		Preferred Member Units (294 units)				2,291		2,291

						6,319		6,319

ASC Interests, LLC	Recreational and Educational Shooting Facility
		11% Secured Debt (Maturity — July 31, 2018)		2,100		2,084		2,100
		Member Units (1,500 units)(8)				1,500		2,680

						3,584		4,780

Bond-Coat, Inc.	Casing and Tubing Coating Services
		12% Secured Debt (Maturity — December 28, 2017)		11,596		11,556		11,596
		Common Stock (57,508 shares)				6,350		6,660

						17,906		18,256

Café Brazil, LLC	Casual Restaurant Group
		Member Units (1,233 units)(8)				1,742		6,040

CBT Nuggets, LLC	Produces and Sells IT Training Certification Videos
		Member Units (416 units)(8)				1,300		55,480

Clad-Rex Steel, LLC	Specialty Manufacturer of Vinyl-Clad Metal
		LIBOR Plus 9.50% (Floor 1.00%), Current Coupon 10.50%, Secured Debt (Maturity — December 20, 2018)(9)		400		396		396
		LIBOR Plus 9.50% (Floor 1.00%), Current Coupon 10.50%, Secured Debt (Maturity — December 20, 2021)(9)		14,080		13,941		13,941
		Member Units (717 units)				7,280		7,280
		10% Secured Debt (Clad-Rex Steel RE Investor, LLC) (Maturity — December 20, 2036)		1,202		1,190		1,190
		Member Units (Clad-Rex Steel RE Investor, LLC) (800 units)				210		210

						23,017		23,017

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


CMS Minerals Investments	Oil & Gas Exploration & Production
		Preferred Member Units (CMS Minerals LLC) (458 units)(8)		2,104	3,682
		Member Units (CMS Minerals II, LLC) (100 units)(8)		3,829	3,381

				5,933	7,063

Datacom, LLC	Technology and Telecommunications Provider
		8% Secured Debt (Maturity — May 30, 2017)	900	900	900
		5.25% Current / 5.25% PIK Secured Debt (Maturity — May 30, 2019)(19)	11,713	11,651	11,049
		Class A Preferred Member Units		1,181	1,368
		Class B Preferred Member Units (6,453 units)		6,030	1,529

				19,762	14,846

Gamber-Johnson Holdings, LLC	Manufacturer of Ruggedized Computer Mounting Systems
		LIBOR Plus 11.00% (Floor 1.00%), Current Coupon 12.00%, Secured Debt (Maturity — June 24, 2021)(9)	24,080	23,846	23,846
		Member Units (8,619 units)		14,844	18,920

				38,690	42,766

Garreco, LLC	Manufacturer and Supplier of Dental Products
		14% Secured Debt (Maturity — January 12, 2018)	5,250	5,219	5,219
		Member Units (1,200 units)		1,200	1,150

				6,419	6,369

GRT Rubber Technologies LLC	Manufacturer of Engineered Rubber Products
		LIBOR Plus 9.00% (Floor 1.00%), Current Coupon 10.00%, Secured Debt (Maturity — December 19, 2019)(9)	13,274	13,188	13,274
		Member Units (5,879 units)(8)		13,065	20,310

				26,253	33,584

Gulf Manufacturing, LLC	Manufacturer of Specialty Fabricated Industrial Piping Products
		9% PIK Secured Debt (Ashland Capital IX, LLC) (Maturity — June 30, 2017)(19)	777	777	777
		Member Units (438 units)(8)		2,980	8,770

				3,757	9,547

Gulf Publishing Holdings, LLC	Energy Industry Focused Media and Publishing
		12.5% Secured Debt (Maturity — April 29, 2021)	10,000	9,911	9,911
		Member Units (3,124 units)		3,124	3,124

				13,035	13,035

Harrison Hydra-Gen, Ltd.	Manufacturer of Hydraulic Generators
		Common Stock (107,456 shares)(8)		718	3,120

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Hawthorne Customs and Dispatch Services, LLC	Facilitator of Import Logistics, Brokerage, and Warehousing
		Member Units (500 units)		589	280
		Member Units (Wallisville Real Estate, LLC) (588,210 units)(8)		1,215	2,040

				1,804	2,320

HW Temps LLC	Temporary Staffing Solutions
		LIBOR Plus 13.00% (Floor 1.00%), Current Coupon 14.00%, Secured Debt (Maturity July 2, 2020)(9)	10,576	10,500	10,500
		Preferred Member Units (3,200 units)(8)		3,942	3,940

				14,442	14,440

Hydratec, Inc.	Designer and Installer of Micro-Irrigation Systems
		Common Stock (7,095 shares)(8)		7,095	15,640

IDX Broker, LLC	Provider of Marketing and CRM Tools for the Real Estate Industry
		12.5% Secured Debt (Maturity — November 15, 2018)	10,950	10,904	10,950
		Member Units (5,400 units)(8)		5,606	7,040

				16,510	17,990

Indianapolis Aviation Partners, LLC	Fixed Base Operator
		15% Secured Debt (Maturity — January 15, 2017)	3,100	3,100	3,100
		Warrants (1,046 equivalent units; Expiration — September 15, 2019; Strike price — $0.01 per unit)		1,129	2,649

				4,229	5,749

Jensen Jewelers of Idaho, LLC	Retail Jewelry Store
		Prime Plus 6.75% (Floor 2.00%), Current Coupon 10.25%, Secured Debt (Maturity — November 14, 2019)(9)	4,055	3,996	4,055
		Member Units (627 units)(8)		811	4,460

				4,807	8,515

Lamb Ventures, LLC	Aftermarket Automotive Services Chain
		11% Secured Debt (Maturity — May 31, 2018)	7,657	7,657	7,657
		Preferred Equity (non-voting)		400	400
		Member Units (742 units)(8)		5,273	5,990
		9.5% Secured Debt (Lamb's Real Estate Investment I, LLC) (Maturity — December 31, 2041)	1,170	1,170	1,170
		Member Units (Lamb's Real Estate Investment I, LLC) (1,000 units)(8)		625	1,340

				15,125	16,557

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Lighting Unlimited, LLC	Commercial and Residential Lighting Products and Design Services
		8% Secured Debt (Maturity — August 22, 2017)	1,514	1,514	1,514
		Preferred Equity (non-voting)		434	410
		Warrants (71 equivalent units; Expiration — June 14, 2021; Strike price — $0.01 per unit)		54	—
		Member Units (700 units)		100	—

				2,102	1,924

Marine Shelters Holdings, LLC	Fabricator of Marine and Industrial Shelters
		12% PIK Secured Debt (Maturity — December 28, 2017)(14)	9,967	9,914	9,387
		Preferred Member Units (3,810 units)		5,352	—

				15,266	9,387

MH Corbin Holding LLC	Manufacturer and Distributor of Traffic Safety Products
		10% Secured Debt (Maturity — August 31, 2020)	13,300	13,197	13,197
		Preferred Member Units (4,000 shares)		6,000	6,000

				19,197	19,197

Mid-Columbia Lumber Products, LLC	Manufacturer of Finger-Jointed Lumber Products
		10% Secured Debt (Maturity — December 18, 2017)	1,750	1,750	1,750
		12% Secured Debt (Maturity — December 18, 2017)	3,900	3,900	3,900
		Member Units (3,554 units)		1,810	2,480
		9.5% Secured Debt (Mid — Columbia Real Estate, LLC) (Maturity — May 13, 2025)	836	836	836
		Member Units (Mid — Columbia Real Estate, LLC) (250 units)(8)		250	600

				8,546	9,566

MSC Adviser I, LLC(16)	Third Party Investment Advisory Services
		Member Units (Fully diluted 100.0%)(8)		—	30,617

Mystic Logistics Holdings, LLC	Logistics and Distribution Services Provider for Large Volume Mailers
		12% Secured Debt (Maturity — August 15, 2019)	9,176	9,053	9,176
		Common Stock (5,873 shares)		2,720	5,780

				11,773	14,956

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


NAPCO Precast, LLC	Precast Concrete Manufacturing
		Prime Plus 2.00% (Floor 7.00%), Current Coupon 9.00%, Secured Debt (Maturity — February 1, 2019)(9)	2,713	2,693	2,713
		18% Secured Debt (Maturity — February 1, 2019)	3,952	3,922	3,952
		Member Units (2,955 units)(8)		2,975	10,920

				9,590	17,585

NRI Clinical Research, LLC	Clinical Research Service Provider
		LIBOR Plus 6.50% (Floor 1.50%), Current Coupon 8.00%, Secured Debt (Maturity — September 8, 2017)(9)	200	200	200
		14% Secured Debt (Maturity — September 8, 2017)	4,261	4,228	4,261
		Warrants (251,723 equivalent units; Expiration — September 8, 2021; Strike price — $0.01 per unit)		252	680
		Member Units (1,454,167 units)		765	2,462

				5,445	7,603

NRP Jones, LLC	Manufacturer of Hoses, Fittings and Assemblies
		6% Current / 6% PIK Secured Debt (Maturity — December 22, 2016)(17)(19)	13,915	13,915	13,915
		Warrants (14,331 equivalent units; Expiration — December 22, 2022; Strike price — $0.01 per unit)		817	130
		Member Units (50,877 units)		2,900	410

				17,632	14,455

OMi Holdings, Inc.	Manufacturer of Overhead Cranes
		Common Stock (1,500 shares)(8)		1,080	13,080

Pegasus Research Group, LLC	Provider of Telemarketing and Data Services
		Member Units (460 units)(8)		1,290	8,620

PPL RVs, Inc.	Recreational Vehicle Dealer
		LIBOR Plus 7.00% (Floor 0.50%), Current Coupon 7.93%, Secured Debt (Maturity — November 15, 2021)(9)	18,000	17,826	17,826
		Common Stock (1,962 shares)(8)		2,150	11,780

				19,976	29,606

Principle Environmental, LLC	Noise Abatement Service Provider
		12% Secured Debt (Maturity — April 30, 2017)	4,060	4,060	4,060
		12% Current / 2% PIK Secured Debt (Maturity — April 30, 2017)(19)	3,378	3,378	3,378
		Preferred Member Units (19,631 units)		4,663	5,370
		Warrants (1,036 equivalent units; Expiration — January 31, 2021; Strike price — $0.01 per unit)		1,200	270

				13,301	13,078

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Quality Lease Service, LLC	Provider of Rigsite Accommodation Unit Rentals and Related Services
		8% PIK Secured Debt (Maturity — June 8, 2020)(19)	7,068	7,068	7,068
		Member Units (1,000 units)		1,118	3,188

				8,186	10,256

River Aggregates, LLC	Processor of Construction Aggregates
		Zero Coupon Secured Debt (Maturity — June 30, 2018)	750	627	627
		Member Units (1,150 units)(8)		1,150	4,600
		Member Units (RA Properties, LLC) (1,500 units)		369	2,510

				2,146	7,737

SoftTouch Medical Holdings LLC	Provider of In-Home Pediatric Durable Medical Equipment
		LIBOR Plus 9.00% (Floor 1.00%), Current Coupon 10.00%, Secured Debt (Maturity — October 31, 2019)(9)	7,140	7,096	7,140
		Member Units (4,450 units)(8)		4,930	9,170

				12,026	16,310

The MPI Group, LLC	Manufacturer of Custom Hollow Metal Doors, Frames and Accessories
		9% Secured Debt (Maturity — October 2, 2018)	2,924	2,922	2,922
		Series A Preferred Units (2,500 units)		2,500	—
		Warrants (1,424 equivalent units; Expiration — July 1, 2024; Strike price — $0.01 per unit)		1,096	—
		Member Units (MPI Real Estate Holdings, LLC) (100 units)(8)		2,300	2,300

				8,818	5,222

Uvalco Supply, LLC	Farm and Ranch Supply Store
		9% Secured Debt (Maturity — January 1, 2019)	872	872	872
		Member Units (2,011 units)(8)		3,843	4,640

				4,715	5,512

Vision Interests, Inc.	Manufacturer / Installer of Commercial Signage
		13% Secured Debt (Maturity — December 23, 2018)	2,814	2,814	2,814
		Series A Preferred Stock (3,000,000 shares)		3,000	3,000
		Common Stock (1,126,242 shares)		3,706	—

				9,520	5,814

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)		Cost(4)		Fair Value(18)


Affiliate Investments(6)

AFG Capital Group, LLC	Provider of Rent-to-Own Financing Solutions and Services
		Warrants (42 equivalent units; Expiration — November 7, 2024; Strike price — $0.01 per unit)		$	259	$	670
		Member Units (186 units)(8)			1,200		2,750

					1,459		3,420

Barfly Ventures, LLC(10)	Casual Restaurant Group
		12% Secured Debt (Maturity — August 31, 2020)	5,958		5,860		5,827
		Options (2 equivalent units)			397		490
		Warrant (1 equivalent unit; Expiration — August 31, 2025; Strike price — $1.00 per unit)			473		280

					6,730		6,597

BBB Tank Services, LLC	Maintenance, Repair and Construction Services to the Above-Ground Storage Tank Market
		LIBOR Plus 9.50% (Floor 1.00%), Current Coupon 10.50%, Secured Debt (Maturity — April 8, 2021)(9)	800		797		797
		15% Current Secured Debt (Maturity — April 8, 2021)	4,027		3,991		3,991
		Member Units (800,000 units)			800		800

					5,588		5,588

Boss Industries, LLC	Manufacturer and Distributor of Air, Power and Other Industrial Equipment
		Preferred Member Units (2,242 units)(8)			2,426		2,800

Bridge Capital Solutions Corporation	Financial Services and Cash Flow Solutions Provider
		13% Secured Debt (Maturity — July 25, 2021)	7,500		5,610		5,610
		Warrants (63 equivalent shares; Expiration — April 18, 2022; Strike price — $0.01 per share)			2,132		3,370
		13% Secured Debt (Mercury Service Group, LLC) (Maturity — July 25, 2021)	1,000		991		1,000
		Preferred Member Units (Mercury Service Group, LLC) (17,742 units)(8)			1,000		1,000

					9,733		10,980

Buca C, LLC	Casual Restaurant Group
		LIBOR Plus 7.25% (Floor 1.00%), Current Coupon 8.25%, Secured Debt (Maturity — June 30, 2020)(9)	22,671		22,504		22,671
		Preferred Member Units (6 units; 6% cumulative)(8)(19)			3,937		4,660

					26,441		27,331

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


CAI Software LLC	Provider of Specialized Enterprise Resource Planning Software
		12% Secured Debt (Maturity — October 10, 2019)	3,683	3,660	3,683
		Member Units (65,356 units)(8)		654	2,480

				4,314	6,163

CapFusion, LLC(13)	Non-Bank Lender to Small Businesses
		13% Secured Debt (Maturity — March 25, 2021)	14,400	13,202	13,202
		Warrants (1,600 equivalent units; Expiration — March 24, 2026; Strike price — $0.01 per unit)		1,200	1,200

				14,402	14,402

Chandler Signs Holdings, LLC(10)	Sign Manufacturer
		12% Secured Debt (Maturity — July 4, 2021)	4,500	4,461	4,500
		Class A Units (1,500,000 units)(8)		1,500	3,240

				5,961	7,740

Condit Exhibits, LLC	Tradeshow Exhibits / Custom Displays Provider
		Member Units (3,936 units)(8)		100	1,840

Congruent Credit Opportunities Funds(12)(13)	Investment Partnership
		LP Interests (Congruent Credit Opportunities Fund II, LP) (Fully diluted 19.8%)(8)		5,730	1,518
		LP Interests (Congruent Credit Opportunities Fund III, LP) (Fully diluted 17.4%)(8)		15,754	16,181

				21,484	17,699

Daseke, Inc.	Specialty Transportation Provider
		12% Current / 2.5% PIK Secured Debt (Maturity — July 31, 2018)(19)	21,799	21,632	21,799
		Common Stock (19,467 shares)		5,213	24,063

				26,845	45,862

Dos Rios Partners(12)(13)	Investment Partnership
		LP Interests (Dos Rios Partners, LP) (Fully diluted 20.2%)		5,996	4,925
		LP Interests (Dos Rios Partners — A, LP) (Fully diluted 6.4%)		1,904	1,444

				7,900	6,369

Dos Rios Stone Products LLC(10)	Limestone and Sandstone Dimension Cut Stone Mining Quarries
		Class A Units (2,000,000 units)(8)		2,000	2,070

East Teak Fine Hardwoods, Inc.	Distributor of Hardwood Products
		Common Stock (6,250 shares)(8)		480	860

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


East West Copolymer & Rubber, LLC	Manufacturer of Synthetic Rubbers
		12% Current / 2% PIK Secured Debt (Maturity — October 17, 2019)(19)	9,699	9,591	8,630
		Warrants (2,510,790 equivalent units; Expiration — October 15, 2024; Strike price — $0.01 per unit)		50	—

				9,641	8,630

EIG Fund Investments(12)(13)	Investment Partnership
		LP Interests (EIG Global Private Debt fund-A, L.P.) (Fully diluted 11.1%)(8)		2,804	2,804

EIG Traverse Co-Investment, L.P.(12)(13)	Investment Partnership
		LP Interests (Fully diluted 22.2%)(8)		9,805	9,905

Freeport Financial Funds(12)(13)	Investment Partnership
		LP Interests (Freeport Financial SBIC Fund LP) (Fully diluted 9.3%)(8)		5,974	5,620
		LP Interests (Freeport First Lien Loan Fund III LP) (Fully diluted 6.0%)(8)		4,763	4,763

				10,737	10,383

Gault Financial, LLC (RMB Capital, LLC)	Purchases and Manages Collection of Healthcare and other Business Receivables
		10% Current Secured Debt (Maturity — January 1, 2019)	13,046	13,046	11,079
		Warrants (29,025 equivalent units; Expiration — February 9, 2022; Strike price — $0.01 per unit)		400	—

				13,446	11,079

Glowpoint, Inc.	Provider of Cloud Managed Video Collaboration Services
		12% Secured Debt (Maturity — October 18, 2018)	9,000	8,949	3,997
		Common Stock (7,711,517 shares)(24)		3,958	2,080

				12,907	6,077

Guerdon Modular Holdings, Inc.	Multi-Family and Commercial Modular Construction Company
		9% Current / 4% PIK Secured Debt (Maturity — August 13, 2019)(19)	10,708	10,594	10,594
		Preferred Stock (404,998 shares)		1,140	1,140
		Common Stock (212,033 shares)		2,983	80

				14,717	11,814

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Hawk Ridge Systems, LLC(13)	Value-Added Reseller of Engineering Design and Manufacturing Solutions
		10% Secured Debt (Maturity — December 2, 2021)	10,000	9,901	9,901
		Preferred Member Units (226 units)(8)		2,850	2,850
		Preferred Member Units (HRS Services, ULC) (226 units)		150	150

				12,901	12,901

Houston Plating and Coatings, LLC	Provider of Plating and Industrial Coating Services
		Member Units (265,756 units)		1,429	4,000

I-45 SLF LLC(12)(13)	Investment Partnership
		Member units (Fully diluted 20.0%; 24.4% profits interest)(8)		14,200	14,586

Indianhead Pipeline Services, LLC	Provider of Pipeline Support Services
		12% Secured Debt (Maturity — February 6, 2017)	5,100	5,079	5,079
		Preferred Member Units (33,819 units; 8% cumulative)(8)(19)		2,339	2,677
		Warrants (31,928 equivalent units; Expiration — August 6, 2022; Strike price — $0.001 per unit)		459	—
		Member Units (14,732 units)		1	—

				7,878	7,756

KBK Industries, LLC	Manufacturer of Specialty Oilfield and Industrial Products
		10% Secured Debt (Maturity — September 28, 2017)	1,250	1,250	1,250
		12.5% Secured Debt (Maturity — September 28, 2017)	5,900	5,889	5,889
		Member Units (250 units)		341	2,780

				7,480	9,919

L.F. Manufacturing Holdings, LLC(10)	Manufacturer of Fiberglass Products
		Member Units (2,179,001 units)		2,019	1,380

OnAsset Intelligence, Inc.	Provider of Transportation Monitoring / Tracking Products and Services
		12% PIK Secured Debt (Maturity — December 31, 2015)(17)(19)	4,519	4,519	4,519
		Preferred Stock (912 shares)		1,981	—
		Warrants (5,333 equivalent shares; Expiration — April 18, 2021; Strike price — $0.01 per share)		1,919	—

				8,419	4,519

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


OPI International Ltd.(13)	Provider of Man Camp and Industrial Storage Services
		10% Unsecured Debt (Maturity — April 8, 2018)	473	473	473
		Common Stock (20,766,317 shares)		1,371	1,600

				1,844	2,073

PCI Holding Company, Inc.	Manufacturer of Industrial Gas Generating Systems
		12% Secured Debt (Maturity — March 31, 2019)	13,000	12,898	13,000
		Preferred Stock (1,500,000 shares; 20% cumulative)(8)(19)		3,379	5,370

				16,277	18,370

Rocaceia, LLC (Quality Lease and Rental Holdings, LLC)	Provider of Rigsite Accommodation Unit Rentals and Related Services
		12% Secured Debt (Maturity — January 8, 2018)(14)(15)	30,785	30,281	250
		Preferred Member Units (250 units)		2,500	—

				32,781	250

Tin Roof Acquisition Company	Casual Restaurant Group
		12% Secured Debt (Maturity — November 13, 2018)	13,511	13,385	13,385
		Class C Preferred Stock (Fully diluted 10.0%; 10% cumulative)(8)(19)		2,738	2,738

				16,123	16,123

UniTek Global Services, Inc.(11)	Provider of Outsourced Infrastructure Services
		LIBOR Plus 7.50% (Floor 1.00%), Current Coupon 8.50%, Secured Debt (Maturity — January 13, 2019)(9)	5,021	5,010	5,021
		LIBOR Plus 8.50% (Floor 1.00%), Current Coupon 9.50%, Secured Debt (Maturity — January 13, 2019)(9)	824	824	824
		15% PIK Unsecured Debt (Maturity — July 13, 2019)(19)	745	745	745
		Preferred Stock (4,935,377 shares; 13.5% cumulative)(8)(19)		5,814	6,410
		Common Stock (705,054 shares)		—	3,010

				12,393	16,010

Universal Wellhead Services Holdings, LLC(10)	Provider of Wellhead Equipment, Designs, and Personnel to the Oil & Gas Industry
		Preferred Member Units (UWS Investments, LLC) (716,949 units)		717	720
		Member Units (UWS Investments, LLC) (4,000,000 units)		4,000	610

				4,717	1,330

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)		Cost(4)		Fair Value(18)


Valley Healthcare Group, LLC	Provider of Durable Medical Equipment
		LIBOR Plus 12.50% (Floor 0.50%), Current Coupon 13.12%, Secured Debt (Maturity — December 29, 2020)(9)	12,956		12,844		12,844
		Preferred Member Units (Valley Healthcare Holding, LLC) (1,600 units)			1,600		1,600

					14,444		14,444

Volusion, LLC	Provider of Online Software-as-a-Service eCommerce Solutions
		11.5% Secured Debt (Maturity — January 26, 2020)	17,500		15,298		15,298
		Preferred Member Units (4,876,670 units)			14,000		14,000
		Warrants (1,831,355 equivalent units; Expiration — January 26, 2025; Strike price — $0.01 per unit)			2,576		2,576

					31,874		31,874

Subtotal Affiliate Investments (18.8% of total investments at fair value)				$	394,699	$	375,948

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)	Principal(4)		Cost(4)		Fair Value(18)


Non-Control/Non-Affiliate Investments(7)

Adams Publishing Group, LLC(10)	Local Newspaper Operator
		LIBOR Plus 7.00% (Floor 1.00%), Current Coupon 8.00%, Secured Debt (Maturity — November 3, 2020)(9)	$	7,662	$	7,544	$	7,662

Ahead, LLC(10)	IT Infrastructure Value Added Reseller
		LIBOR Plus 6.50%, Current Coupon 7.50%, Secured Debt (Maturity — November 2, 2020)		14,250		13,906		14,303

Allflex Holdings III Inc.(11)	Manufacturer of Livestock Identification Products
		LIBOR Plus 7.00% (Floor 1.00%), Current Coupon 8.00%, Secured Debt (Maturity — July 19, 2021)(9)		14,795		14,706		14,809

American Scaffold Holdings, Inc.(10)	Marine Scaffolding Service Provider
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 7.50%, Secured Debt (Maturity — March 31, 2022)(9)		7,359		7,258		7,323

American Seafoods Group, LLC(11)	Catcher and Processor of Alaskan Pollock
		LIBOR Plus 5.00% (Floor 1.00%), Current Coupon 6.00%, Secured Debt (Maturity — August 19, 2021)(9)		9,634		9,624		9,634

American Teleconferencing Services, Ltd.(11)	Provider of Audio Conferencing and Video Collaboration Solutions
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 7.50%, Secured Debt (Maturity — December 8, 2021)(9)		11,163		10,345		10,933
		LIBOR Plus 9.50% (Floor 1.00%), Current Coupon 10.50%, Secured Debt (Maturity — June 6, 2022)(9)		3,714		3,569		3,569

						13,914		14,502

Anchor Hocking, LLC(11)	Household Products Manufacturer
		LIBOR Plus 9.00% (Floor 1.00%), Current Coupon 10.00%, Secured Debt (Maturity — June 4, 2018)(9)		2,277		2,277		2,231
		Member Units (440,620 units)				4,928		3,305

						7,205		5,536

AP Gaming I, LLC(10)	Developer, Manufacturer, and Operator of Gaming Machines
		LIBOR Plus 8.25% (Floor 1.00%), Current Coupon 9.25%, Secured Debt (Maturity — December 20, 2020)(9)		7,209		7,099		7,194

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Apex Linen Service, Inc.	Industrial Launderers
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.00%, Secured Debt (Maturity — October 30, 2022)(9)	2,400	2,400	2,400
		13% Secured Debt (Maturity — October 30, 2022)	14,416	14,337	14,337

				16,737	16,737

Applied Products, Inc.(10)	Adhesives Distributor
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 7.50%, Secured Debt (Maturity — September 30, 2019)(9)	3,527	3,499	3,518

Arcus Hunting LLC.(10)	Manufacturer of Bowhunting and Archery Products and Accessories
		LIBOR Plus 7.00% (Floor 1.00%), Current Coupon 8.00%, Secured Debt (Maturity — November 13, 2019)(9)	13,947	13,796	13,947

Artel, LLC(11)	Provider of Secure Satellite Network and IT Solutions
		LIBOR Plus 7.00% (Floor 1.25%), Current Coupon 8.25%, Secured Debt (Maturity — November 27, 2017)(9)	7,050	6,920	6,592

ATI Investment Sub, Inc.(11)	Manufacturer of Solar Tracking Systems
		LIBOR Plus 7.25% (Floor 1.00%), Current Coupon 8.25%, Secured Debt (Maturity — June 22, 2021)(9)	9,500	9,322	9,476

ATS Workholding, Inc.(10)	Manufacturer of Machine Cutting Tools and Accessories
		LIBOR Plus 9.50% (Floor 1.00%), Current Coupon 10.50%, Secured Debt (Maturity — March 10, 2019)(9)	6,173	6,146	5,924

ATX Networks Corp.(11)(13)(21)	Provider of Radio Frequency Management Equipment
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.00%, Secured Debt (Maturity — June 11, 2021)(9)	11,790	11,604	11,584

Berry Aviation, Inc.(10)	Airline Charter Service Operator
		13.75% Secured Debt (Maturity — January 30, 2020)	5,627	5,588	5,627
		Common Stock (553 shares)		400	820

				5,988	6,447

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Bluestem Brands, Inc.(11)	Multi-Channel Retailer of General Merchandise
		LIBOR Plus 7.50% (Floor 1.00%), Current Coupon 8.50%, Secured Debt (Maturity — November 6, 2020)(9)	12,880	12,635	11,227

Brainworks Software, LLC(10)	Advertising Sales and Newspaper Circulation Software
		Prime Plus 9.25% (Floor 3.25%), Current Coupon 13.00%, Secured Debt (Maturity — July 22, 2019)(9)	6,733	6,684	6,733

Brightwood Capital Fund Investments(12)(13)	Investment Partnership
		LP Interests (Brightwood Capital Fund III, LP) (Fully diluted 1.6%)(8)		12,000	11,094
		LP Interests (Brightwood Capital Fund IV, LP) (Fully diluted 0.9%)		500	500

				12,500	11,594

Brundage-Bone Concrete Pumping, Inc.(11)	Construction Services Provider
		10.375% Secured Debt (Maturity — September 1, 2021)	3,000	2,985	3,240

California Pizza Kitchen, Inc.(11)	Casual Restaurant Group
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.00%, Secured Debt (Maturity — August 23, 2022)(9)	4,988	4,940	4,976

Cenveo Corporation(11)	Provider of Commercial Printing, Envelopes, Labels, and Printed Office Products
		6% Secured Debt (Maturity — August 1, 2019)	13,130	11,097	11,719

CDHA Management, LLC(10)	Dental Services
		LIBOR Plus 7.25% (Floor 1.00%), Current Coupon 8.25%, Secured Debt (Maturity — December 5, 2021)(9)	4,491	4,415	4,415

Charlotte Russe, Inc(11)	Fast-Fashion Retailer to Young Women
		LIBOR Plus 5.50% (Floor 1.25%), Current Coupon 6.75%, Secured Debt (Maturity — May 22, 2019)(9)	14,346	14,141	8,724

Clarius BIGS, LLC(10)	Prints & Advertising Film Financing
		15% PIK Secured Debt (Maturity — January 5, 2015)(14)(17)	2,928	2,928	88

Compact Power Equipment, Inc.	Equipment / Tool Rental
		12% Secured Debt (Maturity — October 1, 2017)	4,100	4,095	4,100
		Series A Preferred Stock (4,298,435 shares)		1,079	4,180

				5,174	8,280

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Compuware Corporation(11)	Provider of Software and Supporting Services
		LIBOR Plus 5.25% (Floor 1.00%), Current Coupon 6.25%, Secured Debt (Maturity — December 15, 2019)(9)	8,345	8,187	8,398

Construction Supply Investments, LLC(10)	Distribution Platform of Specialty Construction Materials to Professional Concrete and Masonry Contractors
		LIBOR Plus 9.50% (Floor 1.00%), Current Coupon 10.50%, Secured Debt (Maturity — June 30, 2023)(9)	8,500	8,416	8,416
		Member Units (20,000 units)		2,000	2,000

				10,416	10,416

ContextMedia Health, LLC(11)	Provider of Healthcare Media Content
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 7.50%, Secured Debt (Maturity — December 23, 2021)(9)	8,000	7,201	7,320

Covenant Surgical Partners, Inc.(11)	Ambulatory Surgical Centers
		8.75% Secured Debt (Maturity — August 1, 2019)	800	800	772

CRGT Inc.(11)	Provider of Custom Software Development
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 7.50%, Secured Debt (Maturity — December 19, 2020)(9)	6,366	6,286	6,382

CST Industries Inc.(11)	Storage Tank Manufacturer
		LIBOR Plus 6.25% (Floor 1.50%), Current Coupon 7.75%, Secured Debt (Maturity — May 22, 2017)(9)	9,102	9,084	9,102

Darr Equipment LP(10)	Heavy Equipment Dealer
		12% Current / 2% PIK Secured Debt (Maturity — April 15, 2020)(19)	21,130	20,697	20,748
		Warrants (915,734 equivalent units; Expiration — April 15, 2024; Strike price — $1.50 per unit)		474	10

				21,171	20,758

Digital River, Inc.(11)	Provider of Outsourced e-Commerce Solutions and Services
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 7.50%, Secured Debt (Maturity — February 12, 2021)(9)	15,184	15,086	15,317

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Digital Room LLC(11)	Pure-Play e-Commerce Print Business
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.00%, Secured Debt (Maturity — November 21, 2022)(9)	7,625	7,475	7,549

Drilling Info Holdings, Inc.	Information Services for the Oil and Gas Industry
		Common Stock (3,788,865 shares)		1,335	10,410

ECP-PF Holdings Group, Inc.(10)	Fitness Club Operator
		LIBOR Plus 9.00% (Floor 1.00%), Current Coupon 10.00%, Secured Debt (Maturity — November 26, 2019)(9)	5,625	5,589	5,625

EnCap Energy Fund Investments(12)(13)	Investment Partnership
		LP Interests (EnCap Energy Capital Fund VIII, L.P.) (Fully diluted 0.1%)(8)		3,877	1,955
		LP Interests (EnCap Energy Capital Fund VIII Co-Investors, L.P.) (Fully diluted 0.4%)		2,200	1,225
		LP Interests (EnCap Energy Capital Fund IX, L.P.) (Fully diluted 0.1%)(8)		3,957	3,680
		LP Interests (Encap Energy Capital Fund X, L.P.)(Fully diluted 0.1%)		3,039	3,039
		LP Interests (EnCap Flatrock Midstream Fund II, L.P.)(Fully diluted 0.8%)(8)		9,116	10,452
		LP Interests (EnCap Flatrock Midstream Fund III, L.P.)(Fully diluted 0.2%)(8)		2,513	2,461

				24,702	22,812

Evergreen Skills Lux S.á r.l. (d/b/a Skillsoft)(11)(13)	Technology-based Performance Support Solutions
		LIBOR Plus 8.25% (Floor 1.00%), Current Coupon 9.25%, Secured Debt (Maturity — April 28, 2022)(9)	7,000	6,857	5,274

Flavors Holdings Inc.(11)	Global Provider of Flavoring and Sweetening Products and Solutions
		LIBOR Plus 5.75% (Floor 1.00%), Current Coupon 6.75%, Secured Debt (Maturity — April 3, 2020)(9)	12,483	12,082	10,174

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


GI KBS Merger Sub LLC(11)	Outsourced Janitorial Services to Retail/Grocery Customers
		LIBOR Plus 5.00% (Floor 1.00%), Current Coupon 6.00%, Secured Debt (Maturity — October 29, 2021)(9)	3,900	3,851	3,842
		LIBOR Plus 8.50% (Floor 1.00%), Current Coupon 9.50%, Secured Debt (Maturity — April 29, 2022)(9)	800	787	760

				4,638	4,602

Grace Hill, LLC(10)	Online Training Tools for the Multi-Family Housing Industry
		Prime Plus 5.25% (Floor 1.00%), Current Coupon 9.00%, Secured Debt (Maturity — August 15, 2019)(9)	634	623	634
		LIBOR Plus 6.25% (Floor 1.00%), Current Coupon 7.25%, Secured Debt (Maturity — August 15, 2019)(9)	11,552	11,472	11,552

				12,095	12,186

Great Circle Family Foods, LLC(10)	Quick Service Restaurant Franchise
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.00%, Secured Debt (Maturity — October 28, 2019)(9)	7,648	7,598	7,648

Grupo Hima San Pablo, Inc.(11)	Tertiary Care Hospitals
		LIBOR Plus 7.00% (Floor 1.50%), Current Coupon 8.50%, Secured Debt (Maturity — January 31, 2018)(9)	4,813	4,787	3,734
		13.75% Secured Debt (Maturity — July 31, 2018)	2,000	1,962	1,205

				6,749	4,939

GST Autoleather, Inc.(11)	Automotive Leather Manufacturer
		LIBOR Plus 5.50% (Floor 1.00%), Current Coupon 6.50%, Secured Debt (Maturity — July 10, 2020)(9)	13,317	13,215	13,017

Guitar Center, Inc.(11)	Musical Instruments Retailer
		6.5% Secured Debt (Maturity — April 15, 2019)	14,625	13,890	13,272

Hojeij Branded Foods, LLC(10)	Multi-Airport, Multi-Concept Restaurant Operator
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 7.50%, Secured Debt (Maturity — July 27, 2021)(9)	5,432	5,390	5,432

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Hoover Group, Inc.(10)(13)	Provider of Storage Tanks and Related Products to the Energy and Petrochemical Markets
		LIBOR Plus 7.25% (Floor 1.00%), Current Coupon 8.25%, Secured Debt (Maturity — January 28, 2021)(9)	8,546	7,963	7,963

Horizon Global Corporation(11)(13)	Auto Parts Manufacturer
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.00%, Secured Debt (Maturity — June 30, 2021)(9)	9,375	9,249	9,551

Hostway Corporation(11)	Managed Services and Hosting Provider
		LIBOR Plus 6.75% (Floor 1.25%), Current Coupon 8.00%, Secured Debt (Maturity — December 13, 2019)(9)	10,577	10,515	10,028

Hunter Defense Technologies, Inc.(11)	Provider of Military and Commercial Shelters and Systems
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.00%, Secured Debt (Maturity — August 5, 2019)(9)	9,606	9,120	8,933

Hygea Holdings, Corp.(10)	Provider of Physician Services
		LIBOR Plus 9.25%, Current Coupon 10.17%, Secured Debt (Maturity — February 24, 2019)	7,875	7,381	7,615
		Warrants (5,990,452 equivalent shares; Expiration — February 24, 2023; Strike price — $0.01 per share)		369	1,530

				7,750	9,145

iEnergizer Limited(11)(13)(21)	Provider of Business Outsourcing Solutions
		LIBOR Plus 6.00% (Floor 1.25%), Current Coupon 7.25%, Secured Debt (Maturity — May 1, 2019)(9)	9,918	9,467	9,621

Indivior Finance LLC(11)(13)	Specialty Pharmaceutical Company Treating Opioid Dependence
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.00%, Secured Debt (Maturity — December 19, 2019)(9)	6,750	6,455	6,809

Industrial Container Services, LLC(10)	Steel Drum Reconditioner
		LIBOR Plus 5.75% (Floor 1.00%), Current Coupon 6.75%, Secured Debt (Maturity — December 31, 2018)(9)	8,949	8,932	8,949

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Industrial Services Acquisition, LLC(10)	Industrial Cleaning Services
		11.25% Current / 0.75% PIK Unsecured Debt (Maturity — December 17, 2022)(19)	4,519	4,433	4,433
		Member Units (Industrial Services Investments, LLC) (900,000 units)		900	900

				5,333	5,333

Infinity Acquisition Finance Corp.(11)	Application Software for Capital Markets
		7.25% Unsecured Debt (Maturity — August 1, 2022)	5,700	5,366	4,802

Inn of the Mountain Gods Resort and Casino(11)	Hotel & Casino Owner & Operator
		9.25% Secured Debt (Maturity — November 30, 2020)	6,249	5,924	5,687

Intertain Group Limited(11)(13)(21)	Business-to-Consumer Online Gaming Operator
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 7.50%, Secured Debt (Maturity — April 8, 2022)(9)	4,426	4,364	4,465

iPayment, Inc.(11)	Provider of Merchant Acquisition
		LIBOR Plus 5.25% (Floor 1.50%), Current Coupon 6.75%, Secured Debt (Maturity — May 8, 2017)(9)	14,918	14,907	14,395

iQor US Inc.(11)	Business Process Outsourcing Services Provider
		LIBOR Plus 5.00% (Floor 1.00%), Current Coupon 6.00%, Secured Debt (Maturity — April 1, 2021)(9)	9,812	9,671	9,413

irth Solutions, LLC	Provider of Damage Prevention Information Technology Services
		Member Units (27,893 units)		1,441	1,790

Jackmont Hospitality, Inc.(10)	Franchisee of Casual Dining Restaurants
		LIBOR Plus 4.25% (Floor 1.00%), Current Coupon 5.25% / 2.50% PIK, Current Coupon Plus PIK 7.75%, Secured Debt (Maturity — May 26, 2021)(9)(19)	4,445	4,429	4,445

Joerns Healthcare, LLC(11)	Manufacturer and Distributor of Health Care Equipment & Supplies
		LIBOR Plus 5.00% (Floor 1.00%), Current Coupon 6.00%, Secured Debt (Maturity — May 9, 2020)(9)	14,655	14,560	13,776

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


JSS Holdings, Inc.(11)	Aircraft Maintenance Program Provider
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 7.50%, Secured Debt (Maturity — August 31, 2021)(9)	12,829	12,562	12,765

Kendra Scott, LLC(11)	Jewelry Retail Stores
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.00%, Secured Debt (Maturity — July 17, 2020)(9)	5,578	5,536	5,550

Keypoint Government Solutions, Inc.(11)	Provider of Pre-Employment Screening Services
		LIBOR Plus 6.50% (Floor 1.25%), Current Coupon 7.75%, Secured Debt (Maturity — November 13, 2017)(9)	5,459	5,443	5,431

LaMi Products, LLC(10)	General Merchandise Distribution
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 7.50%, Secured Debt (Maturity — September 16, 2020)(9)	10,735	10,658	10,735

Larchmont Resources, LLC(11)	Oil & Gas Exploration & Production
		LIBOR Plus 9.00% (Floor 1.00%), Current Coupon 10.00%, PIK Secured Debt (Maturity — August 7, 2020)(9)(19)	2,260	2,260	2,209
		Member Units (Larchmont Intermediate Holdco, LLC) (2,828 units)		353	1,193

				2,613	3,402

LKCM Headwater Investments I, L.P.(12)(13)	Investment Partnership
		LP Interests (Fully diluted 2.3%)		2,500	3,627

Logix Acquisition Company, LLC(10)	Competitive Local Exchange Carrier
		LIBOR Plus 8.28% (Floor 1.00%), Current Coupon 9.28%, Secured Debt (Maturity — June 24, 2021)(9)(22)	8,593	8,457	8,593

Looking Glass Investments, LLC(12)(13)	Specialty Consumer Finance
		9% Unsecured Debt (Maturity — June 30, 2020)	188	188	188
		Member Units (2.5 units)		125	125
		Member Units (LGI Predictive Analytics LLC) (190,712 units)(8)		160	160

				473	473

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Messenger, LLC(10)	Supplier of Specialty Stationery and Related Products to the Funeral Industry
		LIBOR Plus 7.25% (Floor 1.00%), Current Coupon 8.25%, Secured Debt (Maturity — September 9, 2020)(9)	14,403	14,326	14,403

Minute Key, Inc.	Operator of Automated Key Duplication Kiosks
		10% Current / 2% PIK Secured Debt (Maturity — September 19, 2019)(19)	15,700	15,404	15,404
		Warrants (1,437,409 equivalent shares; Expiration — May 20, 2025; Strike price — $0.01 per share)		280	470

				15,684	15,874

Mood Media Corporation(11)(13)	Provider of Electronic Equipment
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.00%, Secured Debt (Maturity — May 1, 2019)(9)	14,805	14,645	14,312

New Media Holdings II LLC(11)(13)	Local Newspaper Operator
		LIBOR Plus 6.25% (Floor 1.00%), Current Coupon 7.25%, Secured Debt (Maturity — June 4, 2020)(9)	14,888	14,632	14,813

North American Lifting Holdings, Inc.(11)	Crane Service Provider
		LIBOR Plus 4.50% (Floor 1.00%), Current Coupon 5.50%, Secured Debt (Maturity — November 27, 2020)(9)	3,865	3,235	3,375

North Atlantic Trading Company, Inc.(11)	Marketer/Distributor of Tobacco Products
		LIBOR Plus 6.50% (Floor 1.25%), Current Coupon 7.75%, Secured Debt (Maturity — January 13, 2020)(9)	9,396	9,343	9,337

Novitex Intermediate, LLC(11)	Provider of Document Management Services
		LIBOR Plus 6.75% (Floor 1.25%), Current Coupon 8.00%, Secured Debt (Maturity — July 7, 2020)(9)	9,335	9,175	8,985

NTM Acquisition Corp.(11)	Provider of B2B Travel Information Content
		LIBOR Plus 6.25% (Floor 1.00%), Current Coupon 7.25%, Secured Debt (Maturity — June 7, 2022)(9)	4,144	4,085	4,128

Ospemifene Royalty Sub LLC (QuatRx)(10)	Estrogen-Deficiency Drug Manufacturer and Distributor
		11.5% Secured Debt (Maturity — November 15, 2026)(14)	5,071	5,071	2,088

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Pardus Oil and Gas, LLC(11)	Oil & Gas Exploration & Production
		13% PIK Secured Debt (Maturity — November 12, 2021)(19)	1,869	1,869	1,869
		5% PIK Secured Debt (Maturity — May 13, 2022)(19)	992	992	562
		Member Units (2,472 units)		2,472	970

				5,333	3,401

Paris Presents Incorporated(11)	Branded Cosmetic and Bath Accessories
		LIBOR Plus 8.75% (Floor 1.00%), Current Coupon 9.75%, Secured Debt (Maturity — December 31, 2021)(9)	2,000	1,969	1,960

Parq Holdings Limited Partnership(11)(13)(21)	Hotel & Casino Operator
		LIBOR Plus 7.50% (Floor 1.00%), Current Coupon 8.50%, Secured Debt (Maturity — December 17, 2020)(9)	7,500	7,394	7,388

Permian Holdco 2, Inc.(11)	Storage Tank Manufacturer
		14% PIK Unsecured Debt (Maturity — October 15, 2021)(19)	198	198	198
		Preferred Stock (Permian Holdco 1, Inc.) (154,558 units)		799	799
		Common Stock (Permian Holdco 1, Inc.) (154,558 units)		—	—

				997	997

Pernix Therapeutics Holdings, Inc.(10)	Pharmaceutical Royalty
		12% Secured Debt (Maturity — August 1, 2020)	3,447	3,447	3,326

Pet Holdings ULC(11)(13)(21)	Retailer of Pet Products and Supplies to Consumers
		LIBOR Plus 5.50% (Floor 1.00%), Current Coupon 6.50%, Secured Debt (Maturity — July 5, 2022)(9)	2,494	2,470	2,503

Pike Corporation(11)	Construction and Maintenance Services for Electric Transmission and Distribution Infrastructure
		LIBOR Plus 8.50% (Floor 1.00%), Current Coupon 9.50%, Secured Debt (Maturity — June 22, 2022)(9)	14,000	13,720	14,082

Point.360(10)	Fully Integrated Provider of Digital Media Services
		Warrants (65,463 equivalent shares; Expiration — July 7, 2020; Strike price — $0.75 per share)		69	—
		Common Stock (163,658 shares)		273	63

				342	63

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Polycom, Inc.(11)	Provider of Audio and Video Communication Solutions
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 7.50%, Secured Debt (Maturity — September 27, 2023)(9)	12,089	11,617	12,194

PPC/SHIFT LLC(10)	Provider of Digital Solutions to Automotive Industry
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.00%, Secured Debt (Maturity — June 6, 2022)(9)	7,000	6,852	6,852

Prowler Acquisition Corp.(11)	Specialty Distributor to the Energy Sector
		LIBOR Plus 4.50% (Floor 1.00%), Current Coupon 5.50%, Secured Debt (Maturity — January 28, 2020)(9)	9,519	7,904	7,044

PT Network, LLC(10)	Provider of Outpatient Physical Therapy and Sports Medicine Services
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 7.50%, Secured Debt (Maturity — November 30, 2021)(9)	16,225	15,979	15,979

QBS Parent, Inc.(11)	Provider of Software and Services to the Oil & Gas Industry
		LIBOR Plus 4.75% (Floor 1.00%), Current Coupon 5.75%, Secured Debt (Maturity — August 7, 2021)(9)	11,274	11,201	11,161

Raley's(11)	Family-Owned Supermarket Chain
		LIBOR Plus 6.25% (Floor 1.00%), Current Coupon 7.25%, Secured Debt (Maturity — May 18, 2022)(9)	4,195	4,125	4,242

Redbox Automated Retail, LLC(11)	Operator of Home Media Entertainment Kiosks
		LIBOR Plus 7.50% (Floor 1.00%), Current Coupon 8.50%, Secured Debt (Maturity — September 27, 2021)(9)	15,000	14,581	14,629

Renaissance Learning, Inc.(11)	Technology-based K-12 Learning Solutions
		LIBOR Plus 7.00% (Floor 1.00%), Current Coupon 8.00%, Secured Debt (Maturity — April 11, 2022)(9)	3,000	2,978	2,987

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


RGL Reservoir Operations Inc.(11)(13)(21)	Oil & Gas Equipment and Services
		LIBOR Plus 5.00% (Floor 1.00%), Current Coupon 6.00%, Secured Debt (Maturity — August 13, 2021)(9)	3,910	3,826	880

RM Bidder, LLC(10)	Scripted and Unscripted TV and Digital Programming Provider
		Warrants (327,532 equivalent units; Expiration — October 20, 2025; Strike price — $14.28 per unit)		425	300
		Member Units (2,779 units)		46	44

				471	344

SAExploration, Inc.(10)(13)(21)	Geophysical Services Provider
		Common Stock (50 shares)		65	3

SAFETY Investment Holdings, LLC	Provider of Intelligent Driver Record Monitoring Software and Services
		Member Units (2,000,000 units)		2,000	2,000

Salient Partners L.P.(11)	Provider of Asset Management Services
		LIBOR Plus 8.50% (Floor 1.00%), Current Coupon 9.50%, Secured Debt (Maturity — June 9, 2021)(9)	10,812	10,538	10,352

School Specialty, Inc.(11)	Distributor of Education Supplies and Furniture
		LIBOR Plus 8.50% (Floor 1.00%), Current Coupon 9.50%, Secured Debt (Maturity — June 11, 2019)(9)	5,712	5,632	5,784

Sigma Electric Manufacturing Corporation(10)(13)	Manufacturer and Distributor of Electrical Fittings and Parts
		LIBOR Plus 7.25% (Floor 1.00%), Current Coupon 8.25%, Secured Debt (Maturity — October 13, 2021)(9)	12,500	12,200	12,200

Sorenson Communications, Inc.(11)	Manufacturer of Communication Products for Hearing Impaired
		LIBOR Plus 5.75% (Floor 2.25%), Current Coupon 8.00%, Secured Debt (Maturity — April 30, 2020)(9)	13,371	13,283	13,271

Strike, LLC(11)	Pipeline Construction and Maintenance Services
		LIBOR Plus 8.00% (Floor 1.00%), Current Coupon 9.00%, Secured Debt (Maturity — November 30, 2022)(9)	10,000	9,666	9,864

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Subsea Global Solutions, LLC(10)	Underwater Maintenance and Repair Services
		LIBOR Plus 6.00% (Floor 1.50%), Current Coupon 7.50%, Secured Debt (Maturity — March 17, 2020)(9)	5,629	5,588	5,624

Synagro Infrastructure Company, Inc(11)	Waste Management Services
		LIBOR Plus 5.25% (Floor 1.00%), Current Coupon 6.25%, Secured Debt (Maturity — August 22, 2020)(9)	4,714	4,659	4,136

Targus International, LLC(11)	Distributor of Protective Cases for Mobile Devices
		15% PIK Secured Debt (Maturity — December 31, 2019)(19)	1,140	1,140	1,140
		Common Stock (Targus Cayman HoldCo Limited) (249,614 shares)(13)		2,555	2,260

				3,695	3,400

TE Holdings, LLC(11)	Oil & Gas Exploration & Production
		Member Units (97,048 units)		970	728

TeleGuam Holdings, LLC(11)	Cable and Telecom Services Provider
		LIBOR Plus 4.00% (Floor 1.25%), Current Coupon 5.25%, Secured Debt (Maturity — December 10, 2018)(9)	7,622	7,613	7,546
		LIBOR Plus 7.50% (Floor 1.25%), Current Coupon 8.75%, Secured Debt (Maturity — June 10, 2019)(9)	10,500	10,442	10,290

				18,055	17,836

The Topps Company, Inc.(11)	Trading Cards & Confectionary
		LIBOR Plus 6.00% (Floor 1.25%), Current Coupon 7.25%, Secured Debt (Maturity — October 2, 2020)(9)	2,218	2,208	2,226

TMC Merger Sub Corp.(11)	Refractory & Maintenance Services Provider
		LIBOR Plus 6.25% (Floor 1.00%), Current Coupon 7.25%, Secured Debt (Maturity — October 31, 2022)(9)(23)	12,500	12,376	12,438

TOMS Shoes, LLC(11)	Global Designer, Distributor, and Retailer of Casual Footwear
		LIBOR Plus 5.50% (Floor 1.00%), Current Coupon 6.50%, Secured Debt (Maturity — October 30, 2020)(9)	4,913	4,567	3,635

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Travel Leaders Group, LLC(11)	Travel Agency Network Provider
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.00%, Secured Debt (Maturity — December 7, 2020)(9)	10,994	10,936	10,975

Truck Bodies and Equipment International, Inc.(10)	Manufacturer of Dump Truck Bodies and Dump Trailers
		LIBOR Plus 7.50% (Floor 1.00%), Current Coupon 8.50%, Secured Debt (Maturity — March 31, 2021)(9)	15,750	15,602	15,602

TVG-I-E CMN ACQUISITION, LLC(10)	Organic Lead Generation for Online Postsecondary Schools
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.00%, Secured Debt (Maturity — November 3, 2021)(9)	6,459	6,334	6,334

Tweddle Group, Inc.(11)	Provider of Technical Information Services to Automotive OEMs
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.00%, Secured Debt (Maturity — October 21, 2022)(9)	8,462	8,295	8,419

UniRush, LLC	Provider of Prepaid Debit Card Solutions
		12% Secured Debt (Maturity — February 1, 2019)	12,000	10,981	12,000
		Warrants (444,725 equivalent units; Expiration — February 2, 2026; Strike price — $10.27 per unit)		1,250	1,250

				12,231	13,250

US Joiner Holding Company(11)	Marine Interior Design and Installation
		LIBOR Plus 6.00% (Floor 1.00%), Current Coupon 7.00%, Secured Debt (Maturity — April 16, 2020)(9)	11,514	11,435	11,456

U.S. TelePacific Corp.(10)	Provider of Communications and Managed Services
		LIBOR Plus 8.50% (Floor 1.00%), Current Coupon 9.50%, Secured Debt (Maturity — February 24, 2021)(9)	7,500	7,377	7,377

VCVH Holding Corp. (Verisk)(11)	Healthcare Technology Services Focused on Revenue Maximization
		LIBOR Plus 9.25% (Floor 1.00%), Current Coupon 10.25%, Secured Debt (Maturity — June 1, 2024)(9)	1,500	1,464	1,488

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)


Virtex Enterprises, LP(10)	Specialty, Full-Service Provider of Complex Electronic Manufacturing Services
		12% Secured Debt (Maturity — December 27, 2018)	1,667	1,559	1,559
		Preferred Class A Units (14 units; 5% cumulative)(8)		333	612
		Warrants (11 equivalent units; Expiration — December 27, 2023; Strike price — $0.001 per unit)		186	220

				2,078	2,391

Wellnext, LLC(10)	Manufacturer of Supplements and Vitamins
		LIBOR Plus 9.00% (Floor 0.50%), Current Coupon 9.85%, Secured Debt (Maturity — May 23, 2021)(9)	10,058	9,968	10,058

Western Dental Services, Inc.(11)	Dental Care Services
		LIBOR Plus 6.50% (Floor 1.00%), Current Coupon 7.50%, Secured Debt (Maturity — November 1, 2018)(9)	4,904	4,902	4,885

Wilton Brands LLC(11)	Specialty Housewares Retailer
		LIBOR Plus 7.25% (Floor 1.25%), Current Coupon 8.50%, Secured Debt (Maturity — August 30, 2018)(9)	1,153	1,147	1,093

Worley Claims Services, LLC(10)	Insurance Adjustment Management and Services Provider
		LIBOR Plus 8.00% (Floor 1.00%), Current Coupon 9.00%, Secured Debt (Maturity — October 31, 2020)(9)	6,386	6,342	6,386

YP Holdings LLC(11)	Online and Offline Advertising Operator
		LIBOR Plus 11.00% (Floor 1.25%), Current Coupon 12.25%, Secured Debt (Maturity — June 4, 2018)(9)	11,428	10,969	11,398

Consolidated Schedule of Investments
December 31, 2016
(dollars in thousands) — (Continued)

(1): All investments are Lower Middle Market portfolio investments, unless otherwise noted. See Note B for a description of Lower Middle Market portfolio investments. All of the Company's investments, unless otherwise noted, are encumbered either as security for the Company's Credit Agreement or in support of the SBA-guaranteed debentures issued by the Funds.
(2): Debt investments are income producing, unless otherwise noted. Equity and warrants are non-income producing, unless otherwise noted.
(3): See Note C for a summary of geographic location of portfolio companies.
(4): Principal is net of repayments. Cost is net of repayments and accumulated unearned income.
(5): Control investments are defined by the Investment Company Act of 1940, as amended ("1940 Act") as investments in which more than 25% of the voting securities are owned or where the ability to nominate greater than 50% of the board representation is maintained.
(6): Affiliate investments are defined by the 1940 Act as investments in which between 5% and 25% of the voting securities are owned and the investments are not classified as Control investments.
(7): Non-Control/Non-Affiliate investments are defined by the 1940 Act as investments that are neither Control investments nor Affiliate investments.
(8): Income producing through dividends or distributions.
(9): Index based floating interest rate is subject to contractual minimum interest rate. A majority of the variable rate loans in the Company's investment portfolio bear interest at a rate that may be determined by reference to either LIBOR or an alternate Base Rate (commonly based on the Federal Funds Rate or the Prime Rate), which typically resets semi-annually, quarterly, or monthly at the borrower's option. The borrower may also elect to have multiple interest reset periods for each loan. For each such loan, the Company has provided the weighted average annual stated interest rate in effect at December 31, 2016. As noted in this schedule, 64% (based on the par amount of the loans) of the loans contain LIBOR floors which range between 0.50% and 2.25%, with a weighted-average LIBOR floor of approximately 1.04%.
(10): Private Loan portfolio investment. See Note B for a description of Private Loan portfolio investments.
(11): Middle Market portfolio investment. See Note B for a description of Middle Market portfolio investments.
(12): Other Portfolio investment. See Note B for a description of Other Portfolio investments.
(13): Investment is not a qualifying asset as defined under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70% of total assets at the time of acquisition of any additional non-qualifying assets.
(14): Non-accrual and non-income producing investment.
(15): Portfolio company is in a bankruptcy process and, as such, the maturity date of our debt investments in this portfolio company will not be finally determined until such process is complete. As noted in footnote (14), our debt investments in this portfolio company are on non-accrual status.
(16): External Investment Manager. Investment is not encumbered as security for the Company's Credit Agreement or in support of the SBA-guaranteed debentures issued by the Funds.
(17): Maturity date is under on-going negotiations with the portfolio company and other lenders, if applicable.
(18): Investment value was determined using significant unobservable inputs, unless otherwise noted.
(19): PIK interest income and cumulative dividend income represent income not paid currently in cash.
(20): All portfolio company headquarters are based in the United States, unless otherwise noted.
(21): Portfolio company headquarters are located outside of the United States.
(22): The Company has entered into an intercreditor agreement that entitles the Company to the "last out" tranche of the first lien secured loans, whereby the "first out" tranche will receive priority as to the "last out" tranche with respect to payments of principal, interest, and any

Consolidated Schedule of Investments
December 31, 2016
(dollars in thousands) — (Continued)

MSCC was formebd in March 2007 to operate as an internally managed business development company ("BDC") under the Investment Company Act of 1940, as amended (the "1940 Act"). MSCC wholly owns several investment funds, including Main Street Mezzanine Fund, LP ("MSMF"), Main Street Capital II, LP ("MSC II") and Main Street Capital III, LP ("MSC III" and, collectively with MSMF and MSC II, the "Funds"), and each of their general partners. The Funds are each licensed as a Small Business Investment Company ("SBIC") by the United States Small Business Administration ("SBA"). Because MSCC is internally managed, all of the executive officers and other employees are employed by MSCC. Therefore, MSCC does not pay any external investment advisory fees, but instead directly incurs the operating costs associated with employing investment and portfolio management professionals.

MSC Adviser I, LLC (the "External Investment Manager") was formed in November 2013 as a wholly owned subsidiary of MSCC to provide investment management and other services to parties other than MSCC and its subsidiaries or their portfolio companies ("External Parties") and receive fee income for such services. MSCC has been granted no-action relief by the Securities and Exchange Commission ("SEC") to allow the External Investment Manager to register as a registered investment adviser under the Investment Advisers Act of 1940, as amended. Since the External Investment Manager conducts all of its investment management activities for External Parties, it is accounted for as a portfolio investment of MSCC and is not included as a consolidated subsidiary of MSCC in MSCC's consolidated financial statements.

Main Street's consolidated financial statements are prepared in accordance with generally accepted accounting principles in the United States of America ("U.S. GAAP"). The Company is an investment company following accounting and reporting guidance in Financial Accounting Standards Board ("FASB")

Accounting Standards Codification ("ASC") 946, Financial Services — Investment Companies ("ASC 946"). For each of the periods presented herein, Main Street's consolidated financial statements include the accounts of MSCC and its consolidated subsidiaries. The Investment Portfolio, as used herein, refers to all of Main Street's investments in LMM portfolio companies, investments in Middle Market portfolio companies, Private Loan portfolio investments, Other Portfolio investments and the investment in the External Investment Manager (see Note C — Fair Value Hierarchy for Investments and Debentures — Portfolio Composition — Investment Portfolio Composition for additional discussion of Main Street's Investment Portfolio and definitions for the terms Private Loan and Other Portfolio). Main Street's results of operations and cash flows for the years ended December 31, 2017, 2016 and 2015 and financial position as of December 31, 2017 and 2016, are presented on a consolidated basis. The effects of all intercompany transactions between Main Street and its consolidated subsidiaries have been eliminated in consolidation.

Under regulations pursuant to Article 6 of Regulation S-X applicable to BDCs and ASC 946, Main Street is precluded from consolidating other entities in which Main Street has equity investments, including those in which it has a controlling interest, unless the other entity is another investment company. An exception to this general principle in ASC 946 occurs if Main Street holds a controlling interest in an operating company that provides all or substantially all of its services directly to Main Street or to its portfolio companies. Accordingly, as noted above, MSCC's consolidated financial statements include the financial position and operating results for the Funds and the Taxable Subsidiaries. Main Street has determined that all of its portfolio investments do not qualify for this exception, including the investment in the External Investment Manager. Therefore, Main Street's Investment Portfolio is carried on the consolidated balance sheet at fair value, as discussed further in Note B, with any adjustments to fair value recognized as "Net Change in Unrealized Appreciation (Depreciation)" on the consolidated statements of operations until the investment is realized, usually upon exit, resulting in any gain or loss being recognized as a "Net Realized Gain (Loss)."

Main Street classifies its Investment Portfolio in accordance with the requirements of the 1940 Act. Under the 1940 Act, (a) "Control Investments" are defined as investments in which Main Street owns more than 25% of the voting securities or has rights to maintain greater than 50% of the board representation, (b) "Affiliate Investments" are defined as investments in which Main Street owns between 5% and 25% of the voting securities and does not have rights to maintain greater than 50% of the board representation, and (c) "Non-Control/Non-Affiliate Investments" are defined as investments that are neither Control Investments nor Affiliate Investments.

Main Street accounts for its Investment Portfolio at fair value. As a result, Main Street follows the provisions of ASC 820, Fair Value Measurements and Disclosures ("ASC 820"). ASC 820 defines fair value, establishes a framework for measuring fair value, establishes a fair value hierarchy based on the quality of inputs used to measure fair value and enhances disclosure requirements for fair value measurements. ASC 820 requires Main Street to assume that the portfolio investment is to be sold in the principal market to independent market participants, which may be a hypothetical market. Market participants are defined as buyers and sellers in the principal market that are independent, knowledgeable and willing and able to transact.

Main Street's portfolio strategy calls for it to invest primarily in illiquid debt and equity securities issued by privately held, LMM companies and more liquid debt securities issued by Middle Market companies that are generally larger in size than the LMM companies. Main Street categorizes some of its investments in

LMM companies and Middle Market companies as Private Loan portfolio investments, which are primarily debt securities in privately held companies which have been originated through strategic relationships with other investment funds on a collaborative basis, and are often referred to in the debt markets as "club deals." Private Loan investments are typically similar in size, structure, terms and conditions to investments Main Street holds in its LMM portfolio and Middle Market portfolio. Main Street's portfolio also includes Other Portfolio investments which primarily consist of investments that are not consistent with the typical profiles for its LMM portfolio investments, Middle Market portfolio investments or Private Loan portfolio investments, including investments which may be managed by third parties. Main Street's portfolio investments may be subject to restrictions on resale.

LMM investments and Other Portfolio investments generally have no established trading market while Middle Market securities generally have established markets that are not active. Private Loan investments may include investments which have no established trading market or have established markets that are not active. Main Street determines in good faith the fair value of its Investment Portfolio pursuant to a valuation policy in accordance with ASC 820 and a valuation process approved by its Board of Directors and in accordance with the 1940 Act. Main Street's valuation policies and processes are intended to provide a consistent basis for determining the fair value of Main Street's Investment Portfolio.

For LMM portfolio investments, Main Street generally reviews external events, including private mergers, sales and acquisitions involving comparable companies, and includes these events in the valuation process by using an enterprise value waterfall methodology ("Waterfall") for its LMM equity investments and an income approach using a yield-to-maturity model ("Yield-to-Maturity") for its LMM debt investments. For Middle Market portfolio investments, Main Street primarily uses quoted prices in the valuation process. Main Street determines the appropriateness of the use of third-party broker quotes, if any, in determining fair value based on its understanding of the level of actual transactions used by the broker to develop the quote and whether the quote was an indicative price or binding offer, the depth and consistency of broker quotes and the correlation of changes in broker quotes with underlying performance of the portfolio company and other market indices. For Middle Market and Private Loan portfolio investments in debt securities for which it has determined that third-party quotes or other independent pricing are not available or appropriate, Main Street generally estimates the fair value based on the assumptions that it believes hypothetical market participants would use to value the investment in a current hypothetical sale using the Yield-to-Maturity valuation method. For its Other Portfolio equity investments, Main Street generally calculates the fair value of the investment primarily based on the net asset value ("NAV") of the fund and adjusts the fair value for other factors that would affect the fair value of the investment. All of the valuation approaches for Main Street's portfolio investments estimate the value of the investment as if Main Street were to sell, or exit, the investment as of the measurement date.

These valuation approaches consider the value associated with Main Street's ability to control the capital structure of the portfolio company, as well as the timing of a potential exit. For valuation purposes, "control" portfolio investments are composed of debt and equity securities in companies for which Main Street has a controlling interest in the equity ownership of the portfolio company or the ability to nominate a majority of the portfolio company's board of directors. For valuation purposes, "non-control" portfolio investments are generally composed of debt and equity securities in companies for which Main Street does not have a controlling interest in the equity ownership of the portfolio company or the ability to nominate a majority of the portfolio company's board of directors.

Under the Waterfall valuation method, Main Street estimates the enterprise value of a portfolio company using a combination of market and income approaches or other appropriate valuation methods, such as considering recent transactions in the equity securities of the portfolio company or third-party valuations of the portfolio company, and then performs a waterfall calculation by allocating the enterprise value over the

portfolio company's securities in order of their preference relative to one another. The enterprise value is the fair value at which an enterprise could be sold in a transaction between two willing parties, other than through a forced or liquidation sale. Typically, private companies are bought and sold based on multiples of earnings before interest, taxes, depreciation and amortization ("EBITDA"), cash flows, net income, revenues, or in limited cases, book value. There is no single methodology for estimating enterprise value. For any one portfolio company, enterprise value is generally described as a range of values from which a single estimate of enterprise value is derived. In estimating the enterprise value of a portfolio company, Main Street analyzes various factors including the portfolio company's historical and projected financial results. Due to SEC deadlines for Main Street's quarterly and annual financial reporting, the operating results of a portfolio company used in the current period valuation are generally the results from the period ended three months prior to such valuation date and may include unaudited, projected, budgeted or pro forma financial information and may require adjustments for non-recurring items or to normalize the operating results that may require significant judgment in its determination. In addition, projecting future financial results requires significant judgment regarding future growth assumptions. In evaluating the operating results, Main Street also analyzes the impact of exposure to litigation, loss of customers or other contingencies. After determining the appropriate enterprise value, Main Street allocates the enterprise value to investments in order of the legal priority of the various components of the portfolio company's capital structure. In applying the Waterfall valuation method, Main Street assumes the loans are paid off at the principal amount in a change in control transaction and are not assumed by the buyer, which Main Street believes is consistent with its past transaction history and standard industry practices.

Under the Yield-to-Maturity valuation method, Main Street also uses the income approach to determine the fair value of debt securities based on projections of the discounted future free cash flows that the debt security will likely generate, including analyzing the discounted cash flows of interest and principal amounts for the debt security, as set forth in the associated loan agreements, as well as the financial position and credit risk of the portfolio company. Main Street's estimate of the expected repayment date of its debt securities is generally the maturity date of the instrument, as Main Street generally intends to hold its loans and debt securities to maturity. The Yield-to-Maturity analysis also considers changes in leverage levels, credit quality, portfolio company performance and other factors. Main Street will generally use the value determined by the Yield-to-Maturity analysis as the fair value for that security; however, because of Main Street's general intent to hold its loans to maturity, the fair value will not exceed the principal amount of the debt security valued using the Yield-to-Maturity valuation method. A change in the assumptions that Main Street uses to estimate the fair value of its debt securities using the Yield-to-Maturity valuation method could have a material impact on the determination of fair value. If there is deterioration in credit quality or if a debt security is in workout status, Main Street may consider other factors in determining the fair value of the debt security, including the value attributable to the debt security from the enterprise value of the portfolio company or the proceeds that would most likely be received in a liquidation analysis.

Under the NAV valuation method, for an investment in an investment fund that does not have a readily determinable fair value, Main Street measures the fair value of the investment predominately based on the NAV of the investment fund as of the measurement date and adjusts the investment's fair value for factors known to Main Street that would affect that fund's NAV, including, but not limited to, fair values for individual investments held by the fund if Main Street holds the same investment or for a publicly traded investment. In addition, in determining the fair value of the investment, Main Street considers whether adjustments to the NAV are necessary in certain circumstances, based on the analysis of any restrictions on redemption of Main Street's investment as of the measurement date, recent actual sales or redemptions of interests in the investment fund, and expected future cash flows available to equity holders, including the rate of return on those cash flows compared to an implied market return on equity required by market

participants, or other uncertainties surrounding Main Street's ability to realize the full NAV of its interests in the investment fund.

Pursuant to its internal valuation process and the requirements under the 1940 Act, Main Street performs valuation procedures on each of its portfolio investments quarterly. In addition to its internal valuation process, in arriving at estimates of fair value for its investments in its LMM portfolio companies, Main Street, among other things, consults with a nationally recognized independent financial advisory services firm. The nationally recognized independent financial advisory services firm analyzes and provides observations, recommendations and an assurance certification regarding the Company's determinations of the fair value of its LMM portfolio company investments. The nationally recognized independent financial advisory services firm is generally consulted relative to Main Street's investments in each LMM portfolio company at least once every calendar year, and for Main Street's investments in new LMM portfolio companies, at least once in the twelve-month period subsequent to the initial investment. In certain instances, Main Street may determine that it is not cost-effective, and as a result is not in its stockholders' best interest, to consult with the nationally recognized independent financial advisory services firm on its investments in one or more LMM portfolio companies. Such instances include, but are not limited to, situations where the fair value of Main Street's investment in a LMM portfolio company is determined to be insignificant relative to the total Investment Portfolio. Main Street consulted with and received an assurance certification from its independent financial advisory services firm in arriving at Main Street's determination of fair value on its investments in a total of 53 LMM portfolio companies for the year ended December 31, 2017, representing approximately 91% of the total LMM portfolio at fair value as of December 31, 2017, and on a total of 62 LMM portfolio companies for the year ended December 31, 2016, representing approximately 93% of the total LMM portfolio at fair value as of December 31, 2016. Excluding its investments in new LMM portfolio companies which have not been in the Investment Portfolio for at least twelve months subsequent to the initial investment as of December 31, 2017 and 2016, as applicable, and its investments in the LMM portfolio companies that were not reviewed because their equity is publicly traded, which represented one LMM portfolio company as of December 31, 2016, or they hold real estate for which a third-party appraisal is obtained on at least an annual basis, the percentage of the LMM portfolio reviewed and certified by its independent financial advisory services firm for the years ended December 31, 2017 and 2016 was 97% and 98% of the total LMM portfolio at fair value as of December 31, 2017 and 2016, respectively.

For valuation purposes, all of Main Street's Middle Market portfolio investments are non-control investments. To the extent sufficient observable inputs are available to determine fair value, Main Street uses observable inputs to determine the fair value of these investments through obtaining third-party quotes or other independent pricing. For Middle Market portfolio investments for which it has determined that third-party quotes or other independent pricing are not available or appropriate, Main Street generally estimates the fair value based on the assumptions that it believes hypothetical market participants would use to value such Middle Market debt investments in a current hypothetical sale using the Yield-to-Maturity valuation method and such Middle Market equity investments in a current hypothetical sale using the Waterfall valuation method. Because the vast majority of the Middle Market portfolio investments are typically valued using third-party quotes or other independent pricing services (including 95% and 94% of the Middle Market portfolio investments as of December 31, 2017 and 2016, respectively), Main Street does not generally consult with any financial advisory services firms in connection with determining the fair value of its Middle Market investments.

For valuation purposes, all of Main Street's Private Loan portfolio investments are non-control investments. For Private Loan portfolio investments for which it has determined that third-party quotes or other independent pricing are not available or appropriate, Main Street generally estimates the fair value based on the assumptions that it believes hypothetical market participants would use to value such Private Loan debt

investments in a current hypothetical sale using the Yield-to-Maturity valuation method and such Private Loan equity investments in a current hypothetical sale using the Waterfall valuation method.

In addition to its internal valuation process, in arriving at estimates of fair value for its investments in its Private Loan portfolio companies, Main Street, among other things, consults with a nationally recognized independent financial advisory services firm. The nationally recognized independent financial advisory services firm analyzes and provides observations and recommendations and an assurance certification regarding the Company's determinations of the fair value of its Private Loan portfolio company investments. The nationally recognized independent financial advisory services firm is generally consulted relative to Main Street's investments in each Private Loan portfolio company at least once every calendar year, and for Main Street's investments in new Private Loan portfolio companies, at least once in the twelve-month period subsequent to the initial investment. In certain instances, Main Street may determine that it is not cost-effective, and as a result is not in its stockholders' best interest, to consult with the nationally recognized independent financial advisory services firm on its investments in one or more Private Loan portfolio companies. Such instances include, but are not limited to, situations where the fair value of Main Street's investment in a Private Loan portfolio company is determined to be insignificant relative to the total Investment Portfolio. Main Street consulted with and received an assurance certification from its independent financial advisory services firm in arriving at its determination of fair value on its investments in a total of 26 Private Loan portfolio companies for the year ended December 31, 2017, representing approximately 57% of the total Private Loan portfolio at fair value as of December 31, 2017, and on a total of 26 Private Loan portfolio companies for the year ended December 31, 2016, representing approximately 68% of the total Private Loan portfolio at fair value as of December 31, 2016. Excluding its investments in new Private Loan portfolio companies which have not been in the Investment Portfolio for at least twelve months subsequent to the initial investment decision as of December 31, 2017 and 2016, as applicable, and its investments in its Private Loan portfolio companies that were not reviewed because the investment is valued based upon third-party quotes or other independent pricing, the percentage of the Private Loan portfolio reviewed and certified by its independent financial advisory services firm for the years ended December 31, 2017 and 2016 was 94% and 97% of the total Private Loan portfolio at fair value as of December 31, 2017 and 2016, respectively.

For valuation purposes, all of Main Street's Other Portfolio investments are non-control investments. Main Street's Other Portfolio investments comprised 4.8% and 5.0% of Main Street's Investment Portfolio at fair value as of December 31, 2017 and 2016, respectively. Similar to the LMM investment portfolio, market quotations for Other Portfolio equity investments are generally not readily available. For its Other Portfolio equity investments, Main Street generally determines the fair value of its investments using the NAV valuation method. For its Other Portfolio debt investments for which it has determined that third-party quotes or other independent pricing are not available or appropriate, Main Street generally estimates the fair value based on the assumptions that it believes hypothetical market participants would use to value such Other Portfolio debt investments in a current hypothetical sale using the Yield-to-Maturity valuation method. For its Other Portfolio debt investments for which third-party quotes or other independent pricing are available and appropriate, Main Street determines the fair value of these investments through obtaining third-party quotes or other independent pricing to the extent that these inputs are available and appropriate to determine fair value.

For valuation purposes, Main Street's investment in the External Investment Manager is a control investment. Market quotations are not readily available for this investment, and as a result, Main Street determines the fair value of the External Investment Manager using the Waterfall valuation method under the market approach. In estimating the enterprise value, Main Street analyzes various factors, including the entity's historical and projected financial results, as well as its size, marketability and performance relative to the population of market comparables. This valuation approach estimates the value of the investment as if Main Street were to sell, or exit, the investment. In addition, Main Street considers its ability to control the

capital structure of the company, as well as the timing of a potential exit, in connection with determining the fair value of the External Investment Manager.

Due to the inherent uncertainty in the valuation process, Main Street's determination of fair value for its Investment Portfolio may differ materially from the values that would have been determined had a ready market for the securities existed. In addition, changes in the market environment, portfolio company performance and other events that may occur over the lives of the investments may cause the gains or losses ultimately realized on these investments to be materially different than the valuations currently assigned. Main Street determines the fair value of each individual investment and records changes in fair value as unrealized appreciation or depreciation.

Main Street uses an internally developed portfolio investment rating system in connection with its investment oversight, portfolio management and analysis and investment valuation procedures for its LMM portfolio companies. This system takes into account both quantitative and qualitative factors of the LMM portfolio company and the investments held therein.

The Board of Directors of Main Street has the final responsibility for overseeing, reviewing and approving, in good faith, Main Street's determination of the fair value for its Investment Portfolio, as well as its valuation procedures, consistent with 1940 Act requirements. Main Street believes its Investment Portfolio as of December 31, 2017 and 2016 approximates fair value as of those dates based on the markets in which Main Street operates and other conditions in existence on those reporting dates.

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the period. Actual results may differ from these estimates under different conditions or assumptions. Additionally, as explained in Note B.1., the consolidated financial statements include investments in the Investment Portfolio whose values have been estimated by Main Street with the oversight, review and approval by Main Street's Board of Directors in the absence of readily ascertainable market values. Because of the inherent uncertainty of the Investment Portfolio valuations, those estimated values may differ materially from the values that would have been determined had a ready market for the securities existed.

Cash and cash equivalents consist of cash and highly liquid investments with an original maturity of three months or less at the date of purchase. Cash and cash equivalents are carried at cost, which approximates fair value.

At December 31, 2017, cash balances totaling $47.9 million exceeded Federal Deposit Insurance Corporation insurance protection levels, subjecting the Company to risk related to the uninsured balance. All of the Company's cash deposits are held at large established high credit quality financial institutions and management believes that the risk of loss associated with any uninsured balances is remote.

Main Street records interest and dividend income on the accrual basis to the extent amounts are expected to be collected. Dividend income is recorded as dividends are declared by the portfolio company or at the point an obligation exists for the portfolio company to make a distribution. In accordance with Main Street's valuation policies, Main Street evaluates accrued interest and dividend income periodically for collectability.

When a loan or debt security becomes 90 days or more past due, and if Main Street otherwise does not expect the debtor to be able to service all of its debt or other obligations, Main Street will generally place the loan or debt security on non-accrual status and cease recognizing interest income on that loan or debt security until the borrower has demonstrated the ability and intent to pay contractual amounts due. If a loan or debt security's status significantly improves regarding the debtor's ability to service the debt or other obligations, or if a loan or debt security is sold or written off, Main Street removes it from non-accrual status.

As of December 31, 2017, Main Street's total Investment Portfolio had five investments on non-accrual status, which comprised approximately 0.2% of its fair value and 2.3% of its cost. As of December 31, 2016, Main Street's total Investment Portfolio had four investments on non-accrual status, which comprised approximately 0.6% of its fair value and 3.0% of its cost.

Main Street holds certain debt and preferred equity instruments in its Investment Portfolio that contain payment-in-kind ("PIK") interest and cumulative dividend provisions. The PIK interest, computed at the contractual rate specified in each debt agreement, is periodically added to the principal balance of the debt and is recorded as interest income. Thus, the actual collection of this interest may be deferred until the time of debt principal repayment. Cumulative dividends are recorded as dividend income, and any dividends in arrears are added to the balance of the preferred equity investment. The actual collection of these dividends in arrears may be deferred until such time as the preferred equity is redeemed or sold. To maintain RIC tax treatment (as discussed in Note B.9. below), these non-cash sources of income may need to be paid out to stockholders in the form of distributions, even though Main Street may not have collected the PIK interest and cumulative dividends in cash. Main Street stops accruing PIK interest and cumulative dividends and writes off any accrued and uncollected interest and dividends in arrears when it determines that such PIK interest and dividends in arrears are no longer collectible. For the years ended December 31, 2017, 2016 and 2015, (i) approximately 2.4%, 3.6% and 2.2%, respectively, of Main Street's total investment income was attributable to PIK interest income not paid currently in cash and (ii) approximately 1.6%, 1.2% and 1.0%, respectively, of Main Street's total investment income was attributable to cumulative dividend income not paid currently in cash.

Main Street may periodically provide services, including structuring and advisory services, to its portfolio companies or other third parties. For services that are separately identifiable and evidence exists to substantiate fair value, fee income is recognized as earned, which is generally when the investment or other applicable transaction closes. Fees received in connection with debt financing transactions for services that do not meet these criteria are treated as debt origination fees and are deferred and accreted into income over the life of the financing.

A presentation of the investment income Main Street received from its Investment Portfolio in each of the periods presented is as follows:

Deferred financing costs include commitment fees and other costs related to Main Street's multi-year revolving credit facility (the "Credit Facility", as discussed further in Note F) and its notes (as discussed further in Note G), as well as the commitment fees and leverage fees (approximately 3.4% of the total commitment and draw amounts, as applicable) on the SBIC debentures (as discussed further in Note E) which are not accounted for under the fair value option under ASC 825 (as discussed further in Note B.11.). Deferred financing costs in connection with the Credit Facility are capitalized as an asset. Deferred financing costs in connection with all other debt arrangements not using the fair value option are a direct deduction from the related debt liability.

The Company's equity offering costs are charged against the proceeds from equity offerings when the proceeds are received.

7. Unearned Income — Debt Origination Fees and Original Issue Discount and Discounts/Premiums to Par Value

Main Street capitalizes debt origination fees received in connection with financings and reflects such fees as unearned income netted against the applicable debt investments. The unearned income from the fees is accreted into income based on the effective interest method over the life of the financing.

In connection with its portfolio debt investments, Main Street sometimes receives nominal cost warrants or warrants with an exercise price below the fair value of the underlying equity (together, "nominal cost equity") that are valued as part of the negotiation process with the particular portfolio company. When Main Street receives nominal cost equity, Main Street allocates its cost basis in its investment between its debt security and its nominal cost equity at the time of origination based on amounts negotiated with the particular portfolio company. The allocated amounts are based upon the fair value of the nominal cost equity, which is then used to determine the allocation of cost to the debt security. Any discount recorded on a debt investment resulting from this allocation is reflected as unearned income, which is netted against the applicable debt investment, and accreted into interest income based on the effective interest method over the life of the debt investment. The actual collection of this interest is deferred until the time of debt principal repayment.

Main Street may also purchase debt securities at a discount or at a premium to the par value of the debt security. In the case of a purchase at a discount, Main Street records the investment at the par value of the debt security net of the discount, and the discount is accreted into interest income based on the effective interest method over the life of the debt investment. In the case of a purchase at a premium, Main Street records the investment at the par value of the debt security plus the premium, and the premium is amortized as a reduction to interest income based on the effective interest method over the life of the debt investment.

To maintain RIC tax treatment (as discussed in Note B.9. below), these non-cash sources of income may need to be paid out to stockholders in the form of distributions, even though Main Street may not have collected the interest income. For the years ended December 31, 2017, 2016 and 2015, approximately 3.6%, 3.1% and 2.6%, respectively, of Main Street's total investment income was attributable to interest income from the accretion of discounts associated with debt investments, net of any premium reduction.

Main Street accounts for its share-based compensation plans using the fair value method, as prescribed by ASC 718, Compensation — Stock Compensation. Accordingly, for restricted stock awards, Main Street measures the grant date fair value based upon the market price of its common stock on the date of the grant

and amortizes the fair value of the awards as share-based compensation expense over the requisite service period, which is generally the vesting term.

Effective January 1, 2016, Main Street elected early adoption of Accounting Standards Update ("ASU") 2016-09, Compensation — Stock Compensation: Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09," as discussed further below in Note B.13.). ASU 2016-09 requires that all excess tax benefits and tax deficiencies (including tax benefits of dividends on share-based payment awards) should be recognized as income tax expense or benefit in the income statement and no longer delay recognition of a tax benefit until the tax benefit is realized through a reduction to taxes payable. The tax effects of exercised or vested awards should be treated as discrete items in the reporting period in which they occur. Additionally, ASU 2016-09 allows an entity to make an entity-wide accounting policy election to either estimate the number of awards that are expected to vest, net of forfeitures, (current GAAP) or account for forfeitures when they occur. Amendments related to the timing of when excess tax benefits are recognized, minimum statutory withholding requirements, forfeitures and intrinsic value should be applied using a modified retrospective transition method by means of a cumulative-effect adjustment to equity as of the beginning of the period in which the guidance is adopted. As such, Main Street recorded a $1.8 million adjustment to "Net Unrealized Appreciation, Net of Income Taxes" on the consolidated balance sheet to capture the cumulative tax effect as of January 1, 2016. Main Street has elected to account for forfeitures as they occur and this change had no impact on its consolidated financial statements. The additional amendments (cash flows classification, minimum statutory tax withholding requirements and classification of awards as either a liability or equity) did not have an effect on Main Street's consolidated financial statements.

MSCC has elected to be treated for U.S. federal income tax purposes as a RIC. MSCC's taxable income includes the taxable income generated by MSCC and certain of its subsidiaries, including the Funds, which are treated as disregarded entities for tax purposes. As a RIC, MSCC generally will not pay corporate-level U.S. federal income taxes on any net ordinary taxable income or capital gains that MSCC distributes to its stockholders. MSCC must generally distribute at least 90% of its "investment company taxable income" (which is generally its net ordinary taxable income and realized net short-term capital gains in excess of realized net long-term capital losses) and 90% of its tax-exempt income to maintain its RIC status (pass-through tax treatment for amounts distributed). As part of maintaining RIC status, undistributed taxable income (subject to a 4% non-deductible U.S. federal excise tax) pertaining to a given fiscal year may be distributed up to 12 months subsequent to the end of that fiscal year, provided such dividends are declared on or prior to the later of (i) the filing of the U.S. federal income tax return for the applicable fiscal year or (ii) the fifteenth day of the ninth month following the close of the year in which such taxable income was generated.

The Taxable Subsidiaries primarily hold certain portfolio investments for Main Street. The Taxable Subsidiaries permit Main Street to hold equity investments in portfolio companies which are "pass-through" entities for tax purposes and to continue to comply with the "source-of-income" requirements contained in the RIC tax provisions of the Code. The Taxable Subsidiaries are consolidated with Main Street for U.S. GAAP financial reporting purposes, and the portfolio investments held by the Taxable Subsidiaries are included in Main Street's consolidated financial statements as portfolio investments and recorded at fair value. The Taxable Subsidiaries are not consolidated with MSCC for income tax purposes and may generate income tax expense, or benefit, and tax assets and liabilities, as a result of their ownership of certain portfolio investments. The taxable income, or loss, of the Taxable Subsidiaries may differ from its book income, or loss, due to temporary book and tax timing differences and permanent differences. The Taxable Subsidiaries are each taxed at their normal corporate tax rates based on their taxable income. The income tax expense, or benefit, if any, and the related tax assets and liabilities, of the Taxable Subsidiaries are reflected in Main Street's consolidated financial statements.

In December 2017, the "Tax Cuts and Jobs Act" legislation was enacted. The Tax Cuts and Jobs Act includes significant changes to the U.S. corporate tax system, including a U.S. federal corporate income tax rate reduction from 35% to 21% and other changes. ASC 740, Income Taxes, requires the effects of changes in tax rates and laws on deferred tax balances to be recognized in the period in which the legislation was enacted. As such, we have accounted for the tax effects as a result of the enactment of the Tax Cuts and Jobs Act as of December 31, 2017.

10. Net Realized Gains or Losses and Net Change in Unrealized Appreciation or Depreciation

Realized gains or losses are measured by the difference between the net proceeds from the sale or redemption of an investment or a financial instrument and the cost basis of the investment or financial instrument, without regard to unrealized appreciation or depreciation previously recognized, and includes investments written-off during the period net of recoveries and realized gains or losses from in-kind redemptions. Net change in unrealized appreciation or depreciation reflects the net change in the fair value of the Investment Portfolio and financial instruments and the reclassification of any prior period unrealized appreciation or depreciation on exited investments and financial instruments to realized gains or losses.

Fair value estimates are made at discrete points in time based on relevant information. These estimates may be subjective in nature and involve uncertainties and matters of significant judgment and, therefore, cannot be determined with precision. Main Street believes that the carrying amounts of its financial instruments, consisting of cash and cash equivalents, receivables, payables and other liabilities approximate the fair values of such items due to the short-term nature of these instruments.

As part of Main Street's acquisition of the majority of the equity interests of MSC II in January 2010 (the "MSC II Acquisition"), Main Street elected the fair value option under ASC 825, Financial Instruments ("ASC 825"), relating to accounting for debt obligations at their fair value, for the MSC II SBIC debentures

acquired as part of the acquisition accounting related to the MSC II Acquisition and values those obligations as discussed further in Note C. In order to provide for a more consistent basis of presentation, Main Street has continued to elect the fair value option for SBIC debentures issued by MSC II subsequent to the MSC II Acquisition. When the fair value option is elected for a given SBIC debenture, the deferred loan costs associated with the debenture are fully expensed in the current period to "Net Change in Unrealized Appreciation (Depreciation) — SBIC debentures" as part of the fair value adjustment. Interest incurred in connection with SBIC debentures which are valued at fair value is included in interest expense.

Basic and diluted per share calculations are computed utilizing the weighted-average number of shares of common stock outstanding for the period. In accordance with ASC 260, Earnings Per Share, the unvested shares of restricted stock awarded pursuant to Main Street's equity compensation plans are participating securities and, therefore, are included in the basic earnings per share calculation. As a result, for all periods presented, there is no difference between diluted earnings per share and basic earnings per share amounts.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 supersedes the revenue recognition requirements under ASC 605, Revenue Recognition, and most industry-specific guidance throughout the Industry Topics of the ASC. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Under the new guidance, an entity is required to perform the following five steps: (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. The new guidance will significantly enhance comparability of revenue recognition practices across entities, industries, jurisdictions and capital markets. Additionally, the guidance requires improved disclosures as to the nature, amount, timing and uncertainty of revenue that is recognized. In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net), which clarified the implementation guidance on principal versus agent considerations. In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, which clarified the implementation guidance regarding performance obligations and licensing arrangements. In May 2016, the FASB issued ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606) — Narrow-Scope Improvements and Practical Expedients, which clarified guidance on assessing collectability, presenting sales tax, measuring noncash consideration, and certain transition matters. In December 2016, the FASB issued ASU No. 2016-20, Revenue from Contracts with Customers (Topic 606) — Technical Corrections and Improvements, which provided disclosure relief, and clarified the scope and application of the new revenue standard and related cost guidance. The new guidance will be effective for the annual reporting period beginning after December 15, 2017, including interim periods within that reporting period. Early adoption would be permitted for annual reporting periods beginning after December 15, 2016. Main Street expects to identify similar performance obligations under ASC 606 as compared with deliverables and separate units of account previously identified. As a result, Main Street expects timing of its revenue recognition to remain the same.

In April 2015, the FASB issued ASU 2015-03, Interest — Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs, which requires debt financing costs related to a recognized debt liability to be presented on the balance sheet as a direct deduction from the related debt liability, similar to the presentation of debt discounts. Additionally in August 2015, the FASB issued

ASU 2015-15, Interest — Imputation of Interest: Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements, which provides further clarification on the same topic and states that the SEC would not object to the deferral and presentation of debt issuance costs as an asset and subsequent amortization of the deferred costs over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. Main Street adopted the guidance for debt arrangements that are not line-of-credit arrangements as of June 30, 2017. Comparative financial statements of prior interim and annual periods have been adjusted to apply the new method retrospectively. As a result of the adoption, Main Street reclassified $7.9 million of deferred financing costs assets to a direct deduction from the related debt liability on the consolidated balance sheet as of December 31, 2016. The adoption of this guidance had no impact on net assets, the consolidated statements of operations or the consolidated statements of cash flows.

In May 2015, the FASB issued ASU 2015-07, Fair Value Measurements — Disclosures for Certain Entities that Calculate Net Asset Value per Share. This amendment updates guidance intended to eliminate the diversity in practice surrounding how investments measured at net asset value under the practical expedient with future redemption dates have been categorized in the fair value hierarchy. Under the updated guidance, investments for which fair value is measured at net asset value per share using the practical expedient should no longer be categorized in the fair value hierarchy, while investments for which fair value is measured at net asset value per share but the practical expedient is not applied should continue to be categorized in the fair value hierarchy. The updated guidance requires retrospective adoption for all periods presented and is effective for interim and annual reporting periods beginning after December 15, 2015, with early adoption permitted. Main Street adopted this standard during the three months ended March 31, 2016. There was no impact of the adoption of this new accounting standard on Main Street's consolidated financial statements as none of its investments are measured through the use of the practical expedient.

In February 2016, the FASB issued ASU 2016-02, Leases, which requires lessees to recognize on the balance sheet a right-of-use asset, representing its right to use the underlying asset for the lease term, and a lease liability for all leases with terms greater than 12 months. The guidance also requires qualitative and quantitative disclosures designed to assess the amount, timing, and uncertainty of cash flows arising from leases. The standard requires the use of a modified retrospective transition approach, which includes a number of optional practical expedients that entities may elect to apply. The new guidance is effective for annual periods beginning after December 15, 2018, and interim periods therein. Early application is permitted. While Main Street continues to assess the effect of adoption, Main Street currently believes the most significant change relates to the recognition of a new right-of-use asset and lease liability on its consolidated balance sheet for its office space operating lease. Main Street currently has one operating lease for office space and does not expect a significant change in the leasing activity between now and adoption. See further discussion of the operating lease obligation in Note M.

In March 2016, the FASB issued ASU 2016-09, which is intended to simplify several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The new guidance is effective for annual periods beginning after December 15, 2016, and interim periods therein. Early application is permitted. Main Street elected to early adopt this standard during the three months ended March 31, 2016. See further discussion of the impact of the adoption of this standard in Note B.8.

this new accounting standard on Main Street's consolidated financial statements is not expected to be material.

From time to time, new accounting pronouncements are issued by the FASB or other standards setting bodies that are adopted by Main Street as of the specified effective date. Main Street believes that the impact of recently issued standards and any that are not yet effective will not have a material impact on its consolidated financial statements upon adoption.

NOTE C — FAIR VALUE HIERARCHY FOR INVESTMENTS AND DEBENTURES — PORTFOLIO COMPOSITION

ASC 820 defines fair value, establishes a framework for measuring fair value, establishes a fair value hierarchy based on the quality of inputs used to measure fair value, and enhances disclosure requirements for fair value measurements. Main Street accounts for its investments at fair value.

In accordance with ASC 820, Main Street has categorized its investments based on the priority of the inputs to the valuation technique into a three-level fair value hierarchy. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical investments (Level 1) and the lowest priority to unobservable inputs (Level 3).

Investments recorded on Main Street's balance sheet are categorized based on the inputs to the valuation techniques as follows:

As required by ASC 820, when the inputs used to measure fair value fall within different levels of the hierarchy, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement in its entirety. For example, a Level 3 fair value measurement may include inputs that are observable (Levels 1 and 2) and unobservable (Level 3). Therefore, unrealized appreciation and depreciation related to such investments categorized within the Level 3 tables below may

include changes in fair value that are attributable to both observable inputs (Levels 1 and 2) and unobservable inputs (Level 3). Main Street conducts reviews of fair value hierarchy classifications on a quarterly basis. During the classification process, Main Street may determine that it is appropriate to transfer investments between fair value hierarchy Levels. These transfers occur when Main Street has concluded that it is appropriate for the classification of an individual asset to be changed due to a change in the factors used to determine the selection of the Level. Any such changes are deemed to be effective during the quarter in which the transfer occurs.

As of December 31, 2017, all of Main Street's LMM portfolio investments consisted of illiquid securities issued by private companies. As a result, as of December 31, 2017, the fair value determination for all of Main Street's LMM portfolio investments primarily consisted of unobservable inputs. As a result, all of Main Street's LMM portfolio investments were categorized as Level 3 as of December 31, 2017. As of December 31, 2016, all of Main Street's LMM portfolio investments except for the equity investment in one portfolio company consisted of illiquid securities issued by private companies. The investment which was the exception was in a company with publicly traded equity. As a result, the fair value determination for the LMM portfolio investments primarily consisted of unobservable inputs. The fair value determination for the publicly traded equity security consisted of observable inputs in non-active markets for which sufficient observable inputs were available to determine the fair value. As a result, all of Main Street's LMM portfolio investments were categorized as Level 3 as of December 31, 2016, except for the one publicly traded equity security which was categorized as Level 2.

As of December 31, 2017 and 2016, Main Street's Middle Market portfolio investments consisted primarily of investments in secured and unsecured debt investments and independently rated debt investments. The fair value determination for these investments consisted of a combination of observable inputs in non-active markets for which sufficient observable inputs were not available to determine the fair value of these investments and unobservable inputs. As a result, all of Main Street's Middle Market portfolio investments were categorized as Level 3 as of December 31, 2017 and 2016.

As of December 31, 2017 and 2016, Main Street's Private Loan portfolio investments primarily consisted of investments in interest-bearing secured debt investments. The fair value determination for these investments consisted of a combination of observable inputs in non-active markets for which sufficient observable inputs were not available to determine the fair value of these investments and unobservable inputs. As a result, all of Main Street's Private Loan portfolio investments were categorized as Level 3 as of December 31, 2017 and 2016.

As of December 31, 2017 and 2016, Main Street's Other Portfolio investments consisted of illiquid securities issued by private companies. The fair value determination for these investments primarily consisted of unobservable inputs. As a result, all of Main Street's Other Portfolio investments were categorized as Level 3 as of December 31, 2017 and 2016.

The fair value determination of each portfolio investment categorized as Level 3 required one or more of the following unobservable inputs:

The significant unobservable inputs used in the fair value measurement of Main Street's LMM equity securities, which are generally valued through an average of the discounted cash flow technique and the market comparable/enterprise value technique (unless one of these approaches is determined to not be appropriate), are (i) EBITDA multiples and (ii) the weighted-average cost of capital ("WACC"). Significant increases (decreases) in EBITDA multiple inputs in isolation would result in a significantly higher (lower) fair value measurement. On the contrary, significant increases (decreases) in WACC inputs in isolation would result in a significantly lower (higher) fair value measurement. The significant unobservable inputs used in the fair value measurement of Main Street's LMM, Middle Market, Private Loan and Other Portfolio debt securities are (i) risk adjusted discount rates used in the Yield-to-Maturity valuation technique (described in Note B.1. — Valuation of the Investment Portfolio) and (ii) the percentage of expected principal recovery. Significant increases (decreases) in any of these discount rates in isolation would result in a significantly lower (higher) fair value measurement. Significant increases (decreases) in any of these expected principal recovery percentages in isolation would result in a significantly higher (lower) fair value measurement. However, due to the nature of certain investments, fair value measurements may be based on other criteria, such as third-party appraisals of collateral and fair values as determined by independent third parties, which are not presented in the tables below.

The following tables provide a summary of the significant unobservable inputs used to fair value Main Street's Level 3 portfolio investments as of December 31, 2017 and 2016:

The following tables provide a summary of changes in fair value of Main Street's Level 3 portfolio investments for the years ended December 31, 2017 and 2016 (amounts in thousands):

As of December 31, 2017 and 2016, the fair value determination for the SBIC debentures recorded at fair value primarily consisted of unobservable inputs. As a result, the SBIC debentures which are recorded at fair value were categorized as Level 3. Main Street determines the fair value of these instruments primarily using a Yield-to-Maturity approach that analyzes the discounted cash flows of interest and principal for each SBIC debenture recorded at fair value based on estimated market interest rates for debt instruments of similar structure, terms, and maturity. Main Street's estimate of the expected repayment date of principal for each SBIC debenture recorded at fair value is the legal maturity date of the instrument. The significant unobservable inputs used in the fair value measurement of Main Street's SBIC debentures recorded at fair value are the estimated market interest rates used to fair value each debenture using the yield valuation technique described above. Significant increases (decreases) in the estimated market interest rates in isolation would result in a significantly lower (higher) fair value measurement.

The following tables provide a summary of the significant unobservable inputs used to fair value Main Street's Level 3 SBIC debentures as of December 31, 2017 and 2016 (amounts in thousands):

The following tables provide a summary of changes for the Level 3 SBIC debentures recorded at fair value for the years ended December 31, 2017 and 2016 (amounts in thousands):

At December 31, 2017 and 2016, Main Street's investments and SBIC debentures at fair value were categorized as follows in the fair value hierarchy for ASC 820 purposes:

Main Street's LMM portfolio investments primarily consist of secured debt, equity warrants and direct equity investments in privately held, LMM companies based in the United States. Main Street's LMM portfolio companies generally have annual revenues between $10 million and $150 million, and its LMM investments generally range in size from $5 million to $50 million. The LMM debt investments are typically secured by either a first or second priority lien on the assets of the portfolio company, generally bear interest at fixed rates, and generally have a term of between five and seven years from the original investment date. In most LMM portfolio investments, Main Street receives nominally priced equity warrants and/or makes direct equity investments in connection with a debt investment.

Main Street's Middle Market portfolio investments primarily consist of direct investments in or secondary purchases of interest-bearing debt securities in privately held companies based in the United States that are generally larger in size than the companies included in Main Street's LMM portfolio. Main Street's Middle Market portfolio companies generally have annual revenues between $150 million and $1.5 billion, and its Middle Market investments generally range in size from $3 million to $20 million. Main Street's Middle Market portfolio debt investments are generally secured by either a first or second priority lien on the assets of the portfolio company and typically have a term of between three and seven years from the original investment date.

Main Street's private loan ("Private Loan") portfolio investments are primarily debt securities in privately held companies which have been originated through strategic relationships with other investment funds on a collaborative basis, and are often referred to in the debt markets as "club deals." Private Loan investments are typically similar in size, structure, terms and conditions to investments Main Street holds in its LMM portfolio and Middle Market portfolio. Main Street's Private Loan portfolio debt investments are generally secured by either a first or second priority lien on the assets of the portfolio company and typically have a term of between three and seven years from the original investment date.

Main Street's other portfolio ("Other Portfolio") investments primarily consist of investments which are not consistent with the typical profiles for LMM, Middle Market and Private Loan portfolio investments, including investments which may be managed by third parties. In the Other Portfolio, Main Street may incur indirect fees and expenses in connection with investments managed by third parties, such as investments in other investment companies or private funds. For Other Portfolio investments, Main Street generally receives distributions related to the assets held by the portfolio company. Those assets are typically expected to be liquidated over a five to ten year period.

Main Street's external asset management business is conducted through its External Investment Manager. The External Investment Manager earns management fees based on the assets of the funds under management and may earn incentive fees, or a carried interest, based on the performance of the funds managed. Main Street entered into an agreement with the External Investment Manager to share employees in connection with its asset management business generally, and specifically for its relationship with HMS Income Fund, Inc. ("HMS Income"). Through this agreement, Main Street shares employees with the External Investment Manager, including their related infrastructure, business relationships, management expertise and capital raising capabilities. Main Street allocates the related expenses to the External Investment Manager pursuant to the sharing agreement. Main Street's total expenses for the years ended December 31, 2017, 2016 and 2015 are net of expenses allocated to the External Investment Manager of $6.4 million, $5.1 million and $4.3 million, respectively.

Investment income, consisting of interest, dividends and fees, can fluctuate dramatically due to various factors, including the level of new investment activity, repayments of debt investments or sales of equity interests. Investment income in any given year could also be highly concentrated among several portfolio companies. For the years ended December 31, 2017, 2016 and 2015, Main Street did not record investment income from any single portfolio company in excess of 10% of total investment income.

The following tables provide a summary of Main Street's investments in the LMM, Middle Market and Private Loan portfolios as of December 31, 2017 and 2016 (this information excludes the Other Portfolio investments and the External Investment Manager which are discussed further below):

As of December 31, 2017, Main Street had Other Portfolio investments in eleven companies, collectively totaling approximately $104.6 million in fair value and approximately $109.4 million in cost basis and which comprised approximately 4.8% of Main Street's Investment Portfolio at fair value. As of December 31, 2016, Main Street had Other Portfolio investments in ten companies, collectively totaling approximately $100.3 million in fair value and approximately $107.1 million in cost basis and which comprised approximately 5.0% of Main Street's Investment Portfolio at fair value.

As discussed further in Note A.1., Main Street holds an investment in the External Investment Manager, a wholly owned subsidiary that is treated as a portfolio investment. As of December 31, 2017, there was no cost basis in this investment and the investment had a fair value of approximately $41.8 million, which comprised approximately 1.9% of Main Street's Investment Portfolio at fair value. As of December 31, 2016, there was no cost basis in this investment and the investment had a fair value of approximately $30.6 million, which comprised approximately 1.5% of Main Street's Investment Portfolio at fair value.

Market portfolio investments and Private Loan portfolio investments, as of December 31, 2017 and 2016 (this information excludes the Other Portfolio investments and the External Investment Manager).

The following tables summarize the composition of Main Street's total combined LMM portfolio investments, Middle Market portfolio investments and Private Loan portfolio investments by geographic region of the United States and other countries at cost and fair value as a percentage of the total combined LMM portfolio investments, Middle Market portfolio investments and Private Loan portfolio investments, as of December 31, 2017 and 2016 (this information excludes the Other Portfolio investments and the External Investment Manager). The geographic composition is determined by the location of the corporate headquarters of the portfolio company.

Main Street's LMM portfolio investments, Middle Market portfolio investments and Private Loan portfolio investments are in companies conducting business in a variety of industries. The following tables summarize the composition of Main Street's total combined LMM portfolio investments, Middle Market portfolio investments and Private Loan portfolio investments by industry at cost and fair value as of

December 31, 2017 and 2016 (this information excludes the Other Portfolio investments and the External Investment Manager).

Cost:

Energy Equipment & Services	6.9%	7.5%
Construction & Engineering	6.4%	5.3%
Hotels, Restaurants & Leisure	6.2%	6.5%
Specialty Retail	5.3%	4.4%
Machinery	5.2%	5.6%
Commercial Services & Supplies	4.5%	5.0%
Media	4.4%	5.7%
Diversified Telecommunication Services	4.1%	3.3%
IT Services	3.9%	3.9%
Professional Services	3.7%	1.4%
Electronic Equipment, Instruments & Components	3.4%	4.5%
Internet Software & Services	3.4%	3.6%
Aerospace & Defense	3.3%	0.9%
Leisure Equipment & Products	3.0%	0.9%
Health Care Providers & Services	2.9%	3.0%
Computers & Peripherals	2.8%	2.2%
Software	2.5%	2.6%
Communications Equipment	2.3%	2.3%
Health Care Equipment & Supplies	2.0%	2.3%
Distributors	1.9%	1.1%
Food Products	1.9%	2.6%
Building Products	1.9%	2.1%
Auto Components	1.9%	3.0%
Construction Materials	1.7%	0.7%
Diversified Consumer Services	1.6%	2.8%
Diversified Financial Services	1.6%	2.3%
Oil, Gas & Consumable Fuels	1.6%	1.2%
Internet & Catalog Retail	1.3%	0.7%
Road & Rail	1.0%	1.5%
Real Estate Management & Development	1.0%	0.7%
Air Freight & Logistics	0.9%	1.0%
Consumer Finance	0.7%	1.5%
Other(1)	4.8%	7.9%

	100.0%	100.0%

Fair Value:

Machinery	6.4%	6.7%
Construction & Engineering	6.3%	5.6%
Energy Equipment & Services	6.2%	5.8%
Hotels, Restaurants & Leisure	5.9%	6.5%
Diversified Consumer Services	5.9%	5.5%
Specialty Retail	5.3%	4.6%
Commercial Services & Supplies	4.1%	5.0%
IT Services	4.0%	3.7%
Media	3.8%	5.2%
Professional Services	3.5%	1.3%
Diversified Telecommunication Services	3.4%	2.5%
Internet Software & Services	3.2%	3.5%
Aerospace & Defense	3.1%	0.8%
Computers & Peripherals	3.0%	2.3%
Leisure Equipment & Products	2.9%	0.9%
Electronic Equipment, Instruments & Components	2.8%	3.9%
Health Care Providers & Services	2.8%	2.9%
Software	2.5%	2.6%
Communications Equipment	2.2%	2.3%
Health Care Equipment & Supplies	2.1%	2.4%
Construction Materials	1.9%	1.0%
Distributors	1.8%	1.1%
Food Products	1.8%	2.4%
Building Products	1.8%	1.9%
Diversified Financial Services	1.6%	2.3%
Auto Components	1.6%	2.9%
Oil, Gas & Consumable Fuels	1.5%	1.1%
Real Estate Management & Development	1.1%	0.7%
Internet & Catalog Retail	1.1%	0.6%
Air Freight & Logistics	1.0%	1.1%
Road & Rail	1.0%	2.5%
Consumer Finance	0.6%	1.3%
Other(1)	3.8%	7.1%

	100.0%	100.0%

At December 31, 2017 and 2016, Main Street had no portfolio investment that was greater than 10% of the Investment Portfolio at fair value.

In accordance with Rules 3-09 and 4-08(g) of Regulation S-X, Main Street must determine which of its unconsolidated controlled portfolio companies, if any, are considered "significant subsidiaries." In evaluating these unconsolidated controlled portfolio companies, there are three tests utilized to determine if any of Main Street's Control Investments (as defined in Note A, including those unconsolidated portfolio companies defined as Control Investments in which Main Street does not own greater than 50% of the voting securities) are considered significant subsidiaries: the investment test, the asset test and the income test. Rule 3-09 of Regulation S-X, as interpreted by the SEC, requires Main Street to include separate audited financial statements of an unconsolidated majority-owned subsidiary (Control Investments in which Main Street owns greater than 50% of the voting securities) in an annual report if any of the three tests exceed 20% of Main Street's total investments at fair value, total assets or total income, respectively. Rule 4-08(g) of Regulation S-X requires summarized financial information of a Control Investment in an annual report if any of the three tests exceeds 10% of Main Street's annual total amounts and Rule 10-01(b)(1) of Regulation S-X requires summarized financial information in a quarterly report if any of the three tests exceeds 20% of Main Street's year-to-date total amounts.

As of December 31, 2017 and 2016, Main Street had no single investment that represented greater than 10% of its total Investment Portfolio at fair value and no single investment whose total assets represented greater than 10% of its total assets. After performing the income test for the years ended December 31, 2017 and 2016, Main Street determined that its income from one of its Control Investments individually generated more than 10% of its total income, primarily due to the unrealized appreciation that was recognized on the investment. As such, CBT Nuggets, LLC, an unconsolidated portfolio company that was a Control Investment, but for which Main Street was not the majority owner and did not have rights to maintain greater than 50% of the board representation, was considered a significant subsidiary at the 10% level as of December 31, 2017 and 2016. Additionally, after performing the income test for the year ended December 31, 2015, excluding investments which were fully exited after December 31, 2015, CBT Nuggets, LLC and the wholly owned External Investment Manager were each considered significant subsidiaries at the 10% income level (see further discussion and summarized financial information of the External Investment Manager in Note D).

The following table shows the summarized financial information for CBT Nuggets, LLC:

As discussed further in Note A.1., the External Investment Manager provides investment management and other services to External Parties. The External Investment Manager is accounted for as a portfolio investment of MSCC since the External Investment Manager conducts all of its investment management activities for External Parties.

During May 2012, Main Street entered into an investment sub-advisory agreement with HMS Adviser, LP ("HMS Adviser"), which is the investment advisor to HMS Income, a non-listed BDC, to provide certain investment advisory services to HMS Adviser. In December 2013, after obtaining required no-action relief from the SEC to allow it to own a registered investment adviser, Main Street assigned the sub-advisory agreement to the External Investment Manager since the fees received from such arrangement could otherwise have negative consequences on MSCC's ability to meet the source-of-income requirement necessary for it to maintain its RIC tax treatment. Under the investment sub-advisory agreement, the External Investment Manager is entitled to 50% of the base management fee and the incentive fees earned by HMS Adviser under its advisory agreement with HMS Income. The External Investment Manager has conditionally agreed to waive a limited amount of the incentive fees otherwise earned. During the years ended December 31, 2017, 2016 and 2015, the External Investment Manager earned $10.9 million, $9.5 million and $7.8 million, respectively, of management fees (net of fees waived, if any) under the sub-advisory agreement with HMS Adviser.

The investment in the External Investment Manager is accounted for using fair value accounting, with the fair value determined by Main Street and approved, in good faith, by Main Street's Board of Directors. Main Street determines the fair value of the External Investment Manager using the Waterfall valuation method under the market approach (see further discussion in Note B.1.). Any change in fair value of the investment in the External Investment Manager is recognized on Main Street's consolidated statements of operations in "Net Change in Unrealized Appreciation (Depreciation) — Portfolio investments."

The External Investment Manager is an indirect wholly owned subsidiary of MSCC owned through a Taxable Subsidiary and is a disregarded entity for tax purposes. The External Investment Manager has entered into a tax sharing agreement with its Taxable Subsidiary owner. Since the External Investment Manager is accounted for as a portfolio investment of MSCC and is not included as a consolidated subsidiary of MSCC in MSCC's consolidated financial statements, and as a result of the tax sharing agreement with its Taxable Subsidiary owner, for financial reporting purposes the External Investment Manager is treated as if it is taxed at normal corporate tax rates based on its taxable income and, as a result of its activities, may generate income tax expense or benefit. Main Street owns the External Investment Manager through the Taxable Subsidiary to allow MSCC to continue to comply with the "source-of-income" requirements contained in the RIC tax provisions of the Code. The taxable income, or loss, of the External Investment Manager may differ from its book income, or loss, due to temporary book and tax timing differences and permanent differences. As a result of the above described financial reporting and tax treatment, the External Investment Manager provides for any income tax expense, or benefit, and any tax assets or liabilities in its separate financial statements.

Main Street shares employees with the External Investment Manager and allocates costs related to such shared employees to the External Investment Manager generally based on a combination of the direct time spent, new investment origination activity and assets under management, depending on the nature of the expense. For the years ended December 31, 2017, 2016 and 2015, Main Street allocated $6.4 million, $5.1 million and $4.3 million of total expenses, respectively, to the External Investment Manager. The total contribution of the External Investment Manager to Main Street's net investment income consists of the combination of the expenses allocated to the External Investment Manager and the dividend income received from the External Investment Manager. For the years ended December 31, 2017, 2016 and 2015, the total

contribution to Main Street's net investment income was $9.4 million, $7.9 million and $6.5 million, respectively.

Summarized financial information from the separate financial statements of the External Investment Manager as of December 31, 2017 and 2016 and for the years ended December 31, 2017, 2016 and 2015 is as follows:

Due to each of the Funds' status as a licensed SBIC, Main Street has the ability to issue, through the Funds, debentures guaranteed by the SBA up to a maximum amount of $350.0 million through its three existing SBIC licenses. SBIC debentures payable were $295.8 million and $240.0 million at December 31, 2017 and 2016, respectively. SBIC debentures provide for interest to be paid semiannually, with principal due at the applicable 10-year maturity date of each debenture. During the year ended December 31, 2017, Main Street issued $81.0 million of SBIC debentures and opportunistically prepaid $25.2 million of existing SBIC debentures as part of an effort to manage the maturity dates of the oldest SBIC debentures, leaving $54.2 million of additional capacity under Main Street's SBIC licenses. As a result of this prepayment, Main Street recognized a realized loss of $5.2 million due to the previously recognized gain recorded as a result of recording the MSC II debentures at fair value on the date of the acquisition of the majority interests of MSC II. The effect of the realized loss is offset by the reversal of all previously recognized unrealized depreciation due to fair value adjustments since the date of the acquisition. Main Street expects to issue new SBIC debentures under the SBIC program in the future in an amount up to the regulatory maximum amount

of $350.0 million for affiliated SBIC funds. The weighted-average annual interest rate on the SBIC debentures was 3.6% and 4.1% as of December 31, 2017 and 2016, respectively. The first principal maturity due under the existing SBIC debentures is in 2019, and the weighted-average remaining duration as of December 31, 2017 was approximately 5.8 years. For the years ended December 31, 2017, 2016 and 2015, Main Street recognized interest expense attributable to the SBIC debentures of $10.5 million, $10.0 million and $9.9 million, respectively. Main Street has incurred upfront leverage and other miscellaneous fees of approximately 3.4% of the debenture principal amount. In accordance with SBA regulations, the Funds are precluded from incurring additional non-SBIC debt without the prior approval of the SBA.

As of December 31, 2017, the recorded value of the SBIC debentures was $288.5 million which consisted of (i) $48.6 million recorded at fair value, or $1.4 million less than the $50.0 million par value of the SBIC debentures issued in MSC II, (ii) $149.8 million par value of SBIC debentures outstanding held in MSMF, with a recorded value of $147.5 million that was net of unamortized debt issuance costs of $2.3 million and (iii) $96.0 million par value of SBIC debentures held in MSC III with a recorded value of $92.4 million that was net of unamortized debt issuance costs of $3.6 million. As of December 31, 2017, if Main Street had adopted the fair value option under ASC 825 for all of its SBIC debentures, Main Street estimates the fair value of its SBIC debentures would be approximately $266.3 million, or $29.5 million less than the $295.8 million face value of the SBIC debentures.

The maturity dates and fixed interest rates for Main Street's SBIC Debentures as of December 31, 2017 and 2016 are summarized in the following table:

Maturity Date

9/1/2017	6.43	%	—	15,000,000
3/1/2018	6.38	%	—	10,200,000
9/1/2019	4.95	%	20,000,000	20,000,000
3/1/2020	4.51	%	10,000,000	10,000,000
9/1/2020	3.50	%	35,000,000	35,000,000
9/1/2020	3.93	%	10,000,000	10,000,000
3/1/2021	4.37	%	10,000,000	10,000,000
3/1/2021	4.60	%	20,000,000	20,000,000
9/1/2021	3.39	%	10,000,000	10,000,000
9/1/2022	2.53	%	5,000,000	5,000,000
3/1/2023	3.16	%	16,000,000	16,000,000
3/1/2024	3.95	%	8,000,000	8,000,000
3/1/2024	3.95	%	12,000,000	12,000,000
3/1/2024	3.95	%	11,400,000	11,400,000
3/1/2024	3.95	%	7,600,000	7,600,000
3/1/2024	3.55	%	24,800,000	24,800,000
3/1/2027	3.52	%	40,400,000	15,000,000
9/1/2027	3.19	%	34,600,000	—
3/1/2028(1)	2.02	%	21,000,000	—

Ending Balance			295,800,000	240,000,000

Main Street maintains the Credit Facility to provide additional liquidity to support its investment and operational activities. The Credit Facility was amended in September 2017 to increase total commitments to $585.0 million from a diversified group of fifteen lenders. The Credit Facility matures in September 2021 and contains an accordion feature which allows Main Street to increase the total commitments under the facility to up to $750.0 million from new and existing lenders on the same terms and conditions as the existing commitments.

Borrowings under the Credit Facility bear interest, subject to Main Street's election, on a per annum basis at a rate equal to the applicable LIBOR rate (1.56% as of December 31, 2017) plus (i) 1.875% (or the applicable base rate (Prime Rate of 4.50% as of December 31, 2017) plus 0.875%) as long as Main Street maintains an investment grade rating and meets certain agreed upon excess collateral and maximum leverage requirements, (ii) 2.0% (or the applicable base rate plus 1.0%) if Main Street maintains an investment grade rating but does not meet certain excess collateral and maximum leverage requirements or (iii) 2.25% (or the applicable base rate plus 1.25%) if Main Street does not maintain an investment grade rating. Main Street pays unused commitment fees of 0.25% per annum on the unused lender commitments under the Credit Facility. The Credit Facility is secured by a first lien on the assets of MSCC and its subsidiaries, excluding the equity ownership or assets of the Funds and the External Investment Manager. The Credit Facility contains certain affirmative and negative covenants, including but not limited to: (i) maintaining a minimum availability of at least 10% of the borrowing base, (ii) maintaining an interest coverage ratio of at least 2.0 to 1.0, (iii) maintaining an asset coverage ratio of at least 1.5 to 1.0 and (iv) maintaining a minimum tangible net worth. The Credit Facility is provided on a revolving basis through its final maturity date in September 2021, and contains two, one-year extension options which could extend the final maturity by up to two years, subject to certain conditions, including lender approval.

At December 31, 2017, Main Street had $64.0 million in borrowings outstanding under the Credit Facility. As of December 31, 2017, if Main Street had adopted the fair value option under ASC 825 for its Credit Facility, Main Street estimates its fair value would approximate its recorded value. Main Street recognized interest expense related to the Credit Facility, including unused commitment fees and amortization of deferred issuance costs, of $10.6 million, $9.2 million and $7.7 million, respectively, for the years ended December 31, 2017, 2016 and 2015. As of December 31, 2017, the interest rate on the Credit Facility was 3.2%. The average interest rate for the year ended December 31, 2017 was 3.0%. Main Street was in compliance with all financial covenants of the Credit Facility.

In April 2013, Main Street issued $92.0 million, including the underwriters full exercise of their option to purchase additional principal amounts to cover over-allotments, in aggregate principal amount of 6.125% Notes due 2023 (the "6.125% Notes"). The 6.125% Notes are unsecured obligations and rank pari passu with Main Street's current and future unsecured indebtedness; senior to any of its future indebtedness that expressly provides it is subordinated to the 6.125% Notes; effectively subordinated to all of its existing and future secured indebtedness, to the extent of the value of the assets securing such indebtedness, including borrowings under its Credit Facility; and structurally subordinated to all existing and future indebtedness and other obligations of any of its subsidiaries, including without limitation, the indebtedness of the Funds. The 6.125% Notes mature on April 1, 2023, and may be redeemed in whole or in part at any time or from time to time at Main Street's option on or after April 1, 2018. The 6.125% Notes bear interest at a rate of 6.125% per year payable quarterly on January 1, April 1, July 1 and October 1 of each year. The total net proceeds to Main Street from the 6.125% Notes, after underwriting discounts and estimated offering expenses payable,

were approximately $89.0 million. Main Street has listed the 6.125% Notes on the New York Stock Exchange under the trading symbol "MSCA." Main Street may from time to time repurchase the 6.125% Notes in accordance with the 1940 Act and the rules promulgated thereunder. As of December 31, 2017, the outstanding balance of the 6.125% Notes was $90.7 million and the recorded value of $89.1 million was net of unamortized debt issuance costs of $1.6 million. As of December 31, 2017, if Main Street had adopted the fair value option under ASC 825 for the 6.125% Notes, Main Street estimates the fair value would be approximately $91.6 million. Main Street recognized interest expense related to the 6.125% Notes, including amortization of unamortized deferred issuance costs, of $5.9 million for each of the years ended December 31, 2017, 2016 and 2015.

The indenture governing the 6.125% Notes (the "6.125% Notes Indenture") contains certain covenants, including covenants requiring Main Street's compliance with (regardless of whether Main Street is subject to) the asset coverage requirements set forth in Section 18(a)(1)(A) as modified by Section 61(a)(1) of the 1940 Act, as well as covenants requiring Main Street to provide financial information to the holders of the 6.125% Notes and the Trustee if Main Street ceases to be subject to the reporting requirements of the Securities Exchange Act of 1934. These covenants are subject to limitations and exceptions that are described in the 6.125% Notes Indenture. As of December 31, 2017, Main Street was in compliance with these covenants.

In November 2014, Main Street issued $175.0 million in aggregate principal amount of 4.50% unsecured notes due 2019 (the "4.50% Notes due 2019") at an issue price of 99.53%. The 4.50% Notes due 2019 are unsecured obligations and rank pari passu with Main Street's current and future unsecured indebtedness; senior to any of its future indebtedness that expressly provides it is subordinated to the 4.50% Notes due 2019; effectively subordinated to all of its existing and future secured indebtedness, to the extent of the value of the assets securing such indebtedness, including borrowings under its Credit Facility; and structurally subordinated to all existing and future indebtedness and other obligations of any of its subsidiaries, including without limitation, the indebtedness of the Funds. The 4.50% Notes due 2019 mature on December 1, 2019, and may be redeemed in whole or in part at any time at Main Street's option subject to certain make-whole provisions. The 4.50% Notes due 2019 bear interest at a rate of 4.50% per year payable semiannually on June 1 and December 1 of each year. The total net proceeds from the 4.50% Notes due 2019, resulting from the issue price and after underwriting discounts and estimated offering expenses payable, were approximately $171.2 million. Main Street may from time to time repurchase the 4.50% Notes due 2019 in accordance with the 1940 Act and the rules promulgated thereunder. As of December 31, 2017, the outstanding balance of the 4.50% Notes due 2019 was $175.0 million and the recorded value of $173.6 million was net of unamortized debt issuance costs of $1.4 million. As of December 31, 2017, if Main Street had adopted the fair value option under ASC 825 for the 4.50% Notes due 2019, Main Street estimates its fair value would be approximately $177.0 million. Main Street recognized interest expense related to the 4.50% Notes due 2019, including amortization of unamortized deferred issuance costs, of $8.6 million for each of the years ended December 31, 2017, 2016 and 2015.

The indenture governing the 4.50% Notes due 2019 (the "4.50% Notes due 2019 Indenture") contains certain covenants, including covenants requiring Main Street's compliance with (regardless of whether Main Street is subject to) the asset coverage requirements set forth in Section 18(a)(1)(A) as modified by Section 61(a)(1) of the 1940 Act, as well as covenants requiring Main Street to provide financial information to the holders of the 4.50% Notes due 2019 and the Trustee if Main Street ceases to be subject to the reporting requirements of the Securities Exchange Act of 1934. These covenants are subject to limitations and exceptions that are described in the 4.50% Notes due 2019 Indenture. As of December 31, 2017, Main Street was in compliance with these covenants.

In November 2017, Main Street issued $185.0 million in aggregate principal amount of 4.50% unsecured notes due 2022 (the "4.50% Notes due 2022") at an issue price of 99.16%. The 4.50% Notes due 2022 are unsecured obligations and rank pari passu with Main Street's current and future unsecured indebtedness; senior to any of its future indebtedness that expressly provides it is subordinated to the 4.50% Notes due 2022; effectively subordinated to all of its existing and future secured indebtedness, to the extent of the value of the assets securing such indebtedness, including borrowings under its Credit Facility; and structurally subordinated to all existing and future indebtedness and other obligations of any of its subsidiaries, including without limitation, the indebtedness of the Funds. The 4.50% Notes due 2022 mature on December 1, 2022, and may be redeemed in whole or in part at any time at Main Street's option subject to certain make-whole provisions. The 4.50% Notes due 2022 bear interest at a rate of 4.50% per year payable semiannually on June 1 and December 1 of each year. The total net proceeds from the 4.50% Notes due 2022, resulting from the issue price and after underwriting discounts and estimated offering expenses payable, were approximately $182.2 million. Main Street may from time to time repurchase the 4.50% Notes due 2022 in accordance with the 1940 Act and the rules promulgated thereunder. As of December 31, 2017, the outstanding balance of the 4.50% Notes due 2022 was $185.0 million and the recorded value of $182.0 million was net of unamortized debt issuance costs of $3.0 million. As of December 31, 2017, if Main Street had adopted the fair value option under ASC 825 for the 4.50% Notes due 2022, Main Street estimates its fair value would be approximately $186.6 million. Main Street recognized interest expense related to the 4.50% Notes due 2022, including amortization of unamortized deferred issuance costs, of $0.9 million for the year ended December 31, 2017.

The indenture governing the 4.50% Notes due 2022 (the "4.50% Notes due 2022 Indenture") contains certain covenants, including covenants requiring Main Street's compliance with (regardless of whether Main Street is subject to) the asset coverage requirements set forth in Section 18(a)(1)(A) as modified by Section 61(a)(1) of the 1940 Act, as well as covenants requiring Main Street to provide financial information to the holders of the 4.50% Notes due 2022 and the Trustee if Main Street ceases to be subject to the reporting requirements of the Securities Exchange Act of 1934. These covenants are subject to limitations and exceptions that are described in the 4.50% Notes due 2022 Indenture. As of December 31, 2017, Main Street was in compliance with these covenants.

	Twelve Months Ended December 31,

Per Share Data:	2017			2016			2015			2014			2013
NAV at the beginning of the period	$	22.10		$	21.24		$	20.85		$	19.89		$	18.59
Net investment income(1)		2.39			2.23			2.18			2.20			2.06
Net realized gain(1)(2)		0.19			0.56			(0.43	)		0.53			0.07
Net change in net unrealized appreciation (depreciation)(1)(2)		0.86			(0.14	)		0.20			(0.27	)		0.52
Income tax benefit (provision)(1)(2)		(0.43	)		0.02			0.18			(0.15	)		—

Net increase in net assets resulting from operations(1)		3.01			2.67			2.13			2.31			2.65
Dividends paid from net investment income		(2.47	)		(1.99	)		(2.49	)		(2.17	)		(2.29	)
Distributions from capital gains		(0.32	)		(0.74	)		(0.16	)		(0.38	)		(0.37	)

Total dividends paid		(2.79	)		(2.73	)		(2.65	)		(2.55	)		(2.66	)
Impact of the net change in monthly dividends declared prior to the end of the period and paid in the subsequent period		(0.01	)		(0.01	)		(0.01	)		(0.01	)		(0.02	)
Accretive effect of stock offerings (issuing shares above NAV per share)		1.07			0.76			0.74			1.07			1.13
Accretive effect of DRIP issuance (issuing shares above NAV per share)		0.06			0.08			0.12			0.12			0.13
Other(3)		0.09			0.09			0.06			0.02			0.07

NAV at the end of the period	$	23.53		$	22.10		$	21.24		$	20.85		$	19.89



Market value at the end of the period	$	39.73		$	36.77		$	29.08		$	29.24		$	32.69
Shares outstanding at the end of the period		58,660,680			54,354,857			50,413,744			45,079,150			39,852,604

(1): Total expenses are the sum of operating expenses and net income tax provision/benefit. Net income tax provision/benefit includes the accrual of net deferred tax provision/benefit relating to the net unrealized appreciation/depreciation on portfolio investments held in Taxable Subsidiaries and due to the change in the loss carryforwards, which are non-cash in nature and may vary significantly from period to period. Main Street is required to include net deferred tax provision/benefit in calculating its total expenses even though these net deferred taxes are not currently payable/receivable.
(2): Unless otherwise noted, operating expenses include interest, compensation, general and administrative and share-based compensation expenses, net of expenses allocated to the External Investment Manager.
(3): Total investment return is based on the purchase of stock at the current market price on the first day and a sale at the current market price on the last day of each period reported on the table and assumes reinvestment of dividends at prices obtained by Main Street's dividend reinvestment plan during the period. The return does not reflect any sales load that may be paid by an investor.
(4): Total return is based on change in net asset value was calculated using the sum of ending net asset value plus dividends to stockholders and other non-operating changes during the period, as divided by the beginning net asset value. Non-operating changes include any items that affect net asset value other than the net increase in net assets resulting from operations, such as the effects of stock offerings, shares issued under the DRIP and equity incentive plans and other miscellaneous items.

During 2017, Main Street paid supplemental dividends of $0.275 per share in each of June and December 2017, regular monthly dividends of $0.185 per share for each month of January through September 2017, regular monthly dividends of $0.190 per share for each month of October through December 2017, with such dividends totaling $157.6 million, or $2.785 per share. The 2017 regular monthly dividends, which total $125.9 million, or $2.235 per share, represent a 2.8% increase from the regular monthly dividends paid per share for the year ended 2016. For tax purposes, the 2017 dividends, which included the effects of accrued dividends, total $2.79 per share and were comprised of (i) ordinary income totaling approximately $2.218 per share, (ii) long term capital gain totaling approximately $0.490 per share, and (iii) qualified dividend income totaling approximately $0.082 per share. As of December 31, 2017, Main Street estimates that it has generated undistributed taxable income of approximately $53.5 million, or $0.91 per share, that will be carried forward toward distributions to be paid in 2018. For the years ended December 31, 2016 and

2015, Main Street paid total dividends of approximately $141.6 million, or $2.725 per share, and $130.0 million, or $2.650 per share, respectively.

Ordinary dividend distributions from a RIC do not qualify for the 20% maximum tax rate (plus a 3.8% Medicare surtax, if applicable) on dividend income from domestic corporations and qualified foreign corporations, except to the extent that the RIC received the income in the form of qualifying dividends from domestic corporations and qualified foreign corporations. The tax attributes for distributions will generally include both ordinary income and capital gains, but may also include qualified dividends or return of capital. The tax character of distributions paid for the years ended December 31, 2017, 2016 and 2015 was as follows:

Listed below is a reconciliation of "Net increase in net assets resulting from operations" to taxable income and to total distributions declared to common stockholders for the years ended December 31, 2017, 2016 and 2015.

	Year Ended December 31,

	2017			2016			2015
	(estimated, dollars in thousands)
Net increase in net assets resulting from operations	$	170,622		$	138,899		$	104,437
Book tax difference from share-based compensation expense		(867	)		1,619			1,006
Net change in net unrealized (appreciation) depreciation		(48,757	)		7,519			(9,992	)
Income tax provision (benefit)		24,471			(1,227	)		(8,687	)
Pre-tax book loss not consolidated for tax purposes		2,357			15,742			32,323
Book income and tax income differences, including debt origination, structuring fees, dividends, realized gains (losses) and changes in estimates		10,844			(7,300	)		3,397

Estimated taxable income(1)		158,670			155,252			122,484
Taxable income earned in prior year and carried forward for distribution in current year		42,362			29,683			38,638
Taxable income earned prior to period end and carried forward for distribution next period		(53,503	)		(52,410	)		(38,757	)
Dividend payable as of period end and paid in the following period		11,146			10,048			9,074

Total distributions accrued or paid to common stockholders	$	158,675		$	142,573		$	131,439

The income tax expense, or benefit, and the related tax assets and liabilities generated by the Taxable Subsidiaries, if any, are reflected in Main Street's consolidated statement of operations. Main Street's

provision for income taxes was comprised of the following for the years ended December 31, 2017, 2016 and 2015 (amounts in thousands):

As of December 31, 2017, the cost of investments for U.S. federal income tax purposes was $2,002.1 million, with such investments having a gross unrealized appreciation of $329.4 million and gross unrealized depreciation of $154.3 million.

The net deferred tax liability at December 31, 2017 was $10.6 million compared to a net deferred tax asset of $9.1 million at December 31, 2016, primarily related to loss carryforwards, timing differences in net unrealized appreciation or depreciation and other temporary book-tax differences relating to portfolio investments held by the Taxable Subsidiaries. In addition, during the three months ended March 31, 2016, Main Street recorded a one-time $1.8 million increase to deferred tax assets for previously unrecognized excess tax benefits associated with share-based compensation due to the early adoption of the new accounting standard ASU 2016-09 (See further discussion in Note B.8.). The net deferred tax liability as of December 31, 2017 equal to $10.6 million reflects a reduction of $2.8 million resulting from the decrease in the U.S. federal corporate income tax rate from 35% to 21% as enacted by the Tax Cuts and Jobs Act (See further discussion in Note B.9.). For the year ended December 31, 2017, for U.S. federal income tax purposes, the Taxable Subsidiaries utilized capital loss carryforwards totaling approximately $9.1 million. At December 31, 2017, for U.S. federal income tax purposes, the Taxable Subsidiaries had a capital loss carryforward of $4.6 million which, if unused, will expire in taxable year 2021. At December 31, 2017, for U.S. federal income tax purposes, the Taxable Subsidiaries had a net operating loss carryforward which, if unused, will expire in various taxable years from 2029 through 2037. The timing and manner in which Main Street will utilize any loss carryforwards in any year, or in total, may be limited in the future under the provisions of the Code.

Management believes that the realization of the deferred tax assets is more likely than not based on expectations as to future taxable income and scheduled reversals of temporary differences. Accordingly, Main Street did not record a valuation allowance related to its deferred tax assets at December 31, 2017 and 2016.

The following table sets forth the significant components of net deferred tax assets and liabilities as of December 31, 2017 and 2016 (amounts in thousands):

In November 2015, Main Street commenced a program with certain selling agents through which it can sell shares of its common stock by means of at-the-market offerings from time to time (the "ATM Program"). During the year ended December 31, 2017, Main Street sold 3,944,972 shares of its common stock at a weighted-average price of $38.72 per share and raised $152.8 million of gross proceeds under the ATM Program. Net proceeds were $150.9 million after commissions to the selling agents on shares sold and offering costs. As of December 31, 2017, 1,911,356 shares remained available for sale under the ATM Program.

During the year ended December 31, 2016, Main Street sold 3,324,646 shares of its common stock at a weighted-average price of $34.17 per share and raised $113.6 million of gross proceeds under the ATM Program. Net proceeds were $112.0 million after commissions to the selling agents on shares sold and offering costs. As of December 31, 2016, sales transactions representing 42,413 shares had not settled and are not included in shares issued and outstanding on the face of the consolidated balance sheet, but are included in the weighted-average shares outstanding in the consolidated statement of operations and in the shares used to calculate net asset value per share.

During November and December 2015, Main Street sold 140,568 shares of its common stock at a weighted-average price of $31.98 per share and raised $4.5 million of gross proceeds under the ATM Program. Net proceeds were $4.3 million after commissions to the selling agents on shares sold and offering costs.

During March 2015, Main Street completed a follow-on public equity offering of 4,370,000 shares of common stock, including the underwriters' full exercise of their option to purchase 570,000 additional shares, resulting in total net proceeds, including exercise of the underwriters' option to purchase additional shares and after deducting underwriting discounts and estimated offering expenses payable by Main Street, of approximately $127.8 million.

Main Street's DRIP provides for the reinvestment of dividends on behalf of its stockholders, unless a stockholder has elected to receive dividends in cash. As a result, if Main Street declares a cash dividend, the company's stockholders who have not "opted out" of the DRIP by the dividend record date will have their cash dividend automatically reinvested into additional shares of MSCC common stock. The share requirements of the DRIP may be satisfied through the issuance of shares of common stock or through open market purchases of common stock. Newly issued shares will be valued based upon the final closing price of MSCC's common stock on the valuation date determined for each dividend by Main Street's Board of Directors. Shares purchased in the open market to satisfy the DRIP requirements will be valued based upon the average price of the applicable shares purchased, before any associated brokerage or other costs. Main Street's DRIP is administered by its transfer agent on behalf of Main Street's record holders and participating brokerage firms. Brokerage firms and other financial intermediaries may decide not to participate in Main Street's DRIP but may provide a similar dividend reinvestment plan for their clients.

For the year ended December 31, 2017, $9.2 million of the total $157.6 million in dividends paid to stockholders represented DRIP participation. During this period, the DRIP participation requirements were satisfied with the issuance of 234,513 newly issued shares. For the year ended December 31, 2016, $14.1 million of the total $141.6 million in dividends paid to stockholders represented DRIP participation. During this period, the DRIP participation requirements were satisfied with the issuance of 434,631 newly issued shares. For the year ended December 31, 2015, $19.4 million of the total $130.0 million in dividends paid to stockholders represented DRIP participation. During this period, the DRIP participation requirements were satisfied with the issuance of 636,079 newly issued shares and with the purchase of 3,131 shares of common stock in the open market. The shares disclosed above relate only to Main Street's DRIP and exclude any activity related to broker-managed dividend reinvestment plans.

Main Street accounts for its share-based compensation plans using the fair value method, as prescribed by ASC 718, Compensation — Stock Compensation. Accordingly, for restricted stock awards, Main Street measured the grant date fair value based upon the market price of its common stock on the date of the grant and amortizes the fair value of the awards as share-based compensation expense over the requisite service period, which is generally the vesting term.

Main Street's Board of Directors approves the issuance of shares of restricted stock to Main Street employees pursuant to the Main Street Capital Corporation 2015 Equity and Incentive Plan (the "Equity and Incentive Plan"). These shares generally vest over a three-year period from the grant date. The fair value is expensed over the service period, starting on the grant date. The following table summarizes the restricted stock issuances approved by Main Street's Board of Directors under the Equity and Incentive Plan, net of shares forfeited, if any, and the remaining shares of restricted stock available for issuance as of December 31, 2017.

As of December 31, 2017, the following table summarizes the restricted stock issued to Main Street's non-employee directors and the remaining shares of restricted stock available for issuance pursuant to the Main Street Capital Corporation 2015 Non-Employee Director Restricted Stock Plan. These shares are granted upon appointment or election to the board and vest on the day immediately preceding the annual meeting of stockholders following the respective grant date and are expensed over such service period.

For the years ended December 31, 2017, 2016 and 2015, Main Street recognized total share-based compensation expense of $10.0 million, $8.3 million and $6.3 million, respectively, related to the restricted stock issued to Main Street employees and independent directors. As of December 31, 2017, there was $10.8 million of total unrecognized compensation expense related to Main Street's non-vested restricted shares. This compensation expense is expected to be recognized over a remaining weighted-average period of approximately 1.7 years as of December 31, 2017.

As of December 31, 2017, Main Street had the following outstanding commitments (in thousands):

	Amount

Investments with equity capital commitments that have not yet funded:
Congruent Credit Opportunities Funds
Congruent Credit Opportunities Fund II, LP	$	8,488
Congruent Credit Opportunities Fund III, LP		12,131

	$	20,619
Encap Energy Fund Investments
EnCap Energy Capital Fund VIII, L.P.	$	377
EnCap Energy Capital Fund IX, L.P.		591
EnCap Energy Capital Fund X, L.P.		3,856
EnCap Flatrock Midstream Fund II, L.P.		7,117
EnCap Flatrock Midstream Fund III, L.P.		4,042

	$	15,983
Brightwood Capital Fund Investments
Brightwood Capital Fund III, LP	$	3,000
Brightwood Capital Fund IV, LP		4,000

	$	7,000
Freeport Fund Investments
Freeport First Lien Loan Fund III LP	$	3,942
Freeport Financial SBIC Fund LP		1,375

	$	5,317
EIG Fund Investments	$	3,980
Harris Preston Fund Investments
HPEP 3, L.P.	$	4,057
LKCM Headwater Investments I, L.P.	$	2,500
Copper Trail Energy Fund I, LP	$	2,500
Dos Rios Partners
Dos Rios Partners, LP	$	1,594
Dos Rios Partners — A, LP		506

	$	2,100
I-45 SLF LLC	$	800
Access Media Holdings, LLC	$	302

Total equity commitments	$	65,158
Investments with commitments to fund revolving loans that have not been fully drawn or term loans with additional commitments not yet funded:
Resolute Industrial, LLC	$	5,750
NNE Partners, LLC		5,542
PT Network, LLC		3,947
Hojeij Branded Foods, LLC		3,422
CDHA Management, LLC		2,343
Wireless Vision Holdings, LLC		2,068
Boccella Precast Products LLC		2,000
Arcus Hunting LLC		1,951
Barfly Ventures, LLC		1,838
Felix Investments Holdings II		1,667
Hawk Ridge Systems, LLC		1,600
Meisler Operating LLC		1,600
Market Force Information, LLC		1,600
Aethon United BR LP		1,563
IDX Broker, LLC		1,500
Lamb Ventures, LLC		1,500
GST Autoleather, Inc.		1,437
Messenger, LLC		1,417
TGP Holdings III LLC		1,255
Gamber-Johnson Holdings, LLC		1,200
NuStep, LLC		1,200
Subsea Global Solutions, LLC		1,114
CTVSH, PLLC		800
Mystic Logistics Holdings, LLC		800
KBK Industries, LLC		625
NRI Clinical Research, LLC		600
PPC/SHIFT LLC		500
UniTek Global Services, Inc.		483
ATS Workholding, LLC		461
Grace Hill, LLC		444
Clad-Rex Steel, LLC		400
Gulf Publishing Holdings, LLC		320
OnAsset Intelligence, Inc.		225
Jensen Jewelers of Idaho, LLC		200
BigName Commerce, LLC		101
Permian Holdco 2, Inc.		39

Total loan commitments	$	53,512

Total commitments	$	118,670

Main Street will fund its unfunded commitments from the same sources it uses to fund its investment commitments that are funded at the time they are made (which are typically through existing cash and cash equivalents and borrowings under the Credit Facility). Main Street follows a process to manage its liquidity and ensure that it has available capital to fund its unfunded commitments as necessary. The Company had total unrealized depreciation of $0.1 million on the outstanding unfunded commitments as of December 31, 2017.

Main Street has an operating lease for office space. Total rent expense incurred by Main Street for the years ended December 2017, 2016 and 2015 was $0.7 million, $0.6 million and $0.5 million, respectively.

The following table shows future minimum payments under Main Street's operating lease as of December 31, 2017:

Main Street may, from time to time, be involved in litigation arising out of its operations in the normal course of business or otherwise. Furthermore, third parties may try to impose liability on Main Street in connection with the activities of its portfolio companies. While the outcome of any current legal proceedings cannot at this time be predicted with certainty, Main Street does not expect any current matters will materially affect its financial condition or results of operations; however, there can be no assurance whether any pending legal proceedings will have a material adverse effect on Main Street's financial condition or results of operations in any future reporting period.

As discussed further in Note D, the External Investment Manager is treated as a wholly owned portfolio company of MSCC and is included as part of Main Street's Investment Portfolio. At December 31, 2017, Main Street had a receivable of approximately $2.9 million due from the External Investment Manager which included (i) approximately $2.0 million related primarily to operating expenses incurred by MSCC or its subsidiaries as required to support the External Investment Manager's business and amounts due from the External Investment Manager to Main Street under a tax sharing agreement (see further discussion in Note D) and (ii) approximately $0.9 million of dividends declared but not paid by the External Investment Manager.

In November 2015, Main Street's Board of Directors approved and adopted the Main Street Capital Corporation Deferred Compensation Plan (the "2015 Deferred Compensation Plan"). The 2015 Deferred Compensation Plan became effective on January 1, 2016 and replaced the Deferred Compensation Plan for Non-Employee Directors previously adopted by the Board of Directors in June 2013 (the "2013 Deferred Compensation Plan"). Under the 2015 Deferred Compensation Plan, non-employee directors and certain key employees may defer receipt of some or all of their cash compensation and directors' fees, subject to certain limitations. Individuals participating in the 2015 Deferred Compensation Plan receive distributions of their respective balances based on predetermined payout schedules or other events as defined by the plan and are also able to direct investments made on their behalf among investment alternatives permitted from time to time under the plan, including phantom Main Street stock units. As of December 31, 2017, $4.0 million of compensation and directors' fees had been deferred under the 2015 Deferred Compensation Plan (including amounts previously deferred under the 2013 Deferred Compensation Plan). Of this amount, $2.5 million was deferred into phantom Main Street stock units, representing 74,487 shares of Main Street's common stock. Including phantom stock units issued through dividend reinvestment, the phantom stock units outstanding as of December 31, 2017 represented 89,040 shares of Main Street's common stock. Any amounts deferred under the plan represented by phantom Main Street stock units will not be issued or included as outstanding on the consolidated statements of changes in net assets until such shares are actually distributed to the

participant in accordance with the plan, but are included in operating expenses and weighted-average shares outstanding in Main Street's consolidated statements of operations as earned.

During January 2018, Main Street made a new portfolio investment to facilitate the minority recapitalization of Brewer Crane, LLC ("Brewer"), a leading Southern California full-service crane rental service provider. Main Street, along with a co-investor, partnered with Brewer's founder and Chief Executive Officer to facilitate the transaction, with Main Street funding $14.2 million in a combination of first-lien, senior secured term debt and a direct equity investment. Headquartered in Lakeside, California, and founded in 1997, Brewer provides crane rental services to San Diego County and the surrounding Southern California area, offering mobile cranes, tower cranes, skilled operators, construction hoists, hauling, rigging, storage, service and repairs, and miscellaneous equipment rental.

In February 2018, Main Street fully exited its debt and equity investments in SoftTouch Medical Holdings, LLC ("SoftTouch"), a leading provider of home medical equipment and services, serving pediatric patients across the states of Georgia and Alabama. SoftTouch provides a broad array of medical equipment and services to chronically ill youth through its diverse product offerings, including respiratory therapy, enteral feeding, phototherapy, ventilators, amongst others. Main Street realized a gain of approximately $5.2 million on the exit of its equity investment in SoftTouch.

In February 2018, Main Street made a new portfolio investment to facilitate the management led buyout of DMS Holdco, LLC. ("DMS"), a leading provider of omni-channel direct marketing services. Main Street, along with a co-investor, partnered with the DMS' management team to facilitate the transaction, with Main Street funding $27.2 million in a combination of first-lien, senior secured term debt and a direct equity investment. Headquartered in Portland, Oregon, and founded in 1982, DMS develops and executes end-to-end, omni-channel direct marketing services including strategy, creative design, direct mail production/fulfillment, and digital marketing to various end markets including the FinTech, banking, telecom and technology industries.

During February 2018, Main Street declared regular monthly dividends of $0.190 per share for each of April, May and June 2018. These regular monthly dividends equal a total of $0.570 per share for the second quarter of 2018. The second quarter 2018 regular monthly dividends represent a 2.7% increase from the dividends declared for the second quarter of 2017. Including the dividends declared for the second quarter of 2018, Main Street will have paid $22.530 per share in cumulative dividends since its October 2007 initial public offering.

We have audited in accordance with the standards of the Public Company Accounting Oversight Board (United States) ("PCAOB") the consolidated financial statements of Main Street Capital Corporation, and subsidiaries, (the "Company") referred to in our report dated February 23, 2018, which is included in the annual report on Form 10-K. Our audits of the consolidated financial statements also included the audit of the financial statement schedule listed in the index appearing under Item 15(2). In our opinion, this financial statement schedule, when considered in relation to the consolidated financial statements as a whole, presents fairly, in all material respects, the information set forth therein.

This financial statement schedule is the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial statement schedule based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

MAIN STREET CAPITAL CORPORATION

Consolidated Schedule of Investments in and Advances to Affiliates
December 31, 2017
(dollars in thousands)

Company	Investment(1)	Amount of Realized Gain/(Loss)			Amount of Unrealized Gain/(Loss)			Amount of Interest, Fees or Dividends Credited to Income(2)		December 31, 2016 Fair Value		Gross Additions(3)		Gross Reductions(4)		December 31, 2017 Fair Value

*Majority-owned investments*

2717 MH, L.P.	LP Interests	$	—		$	—		$	—	$	—	$	536	$	—	$	536

Café Brazil, LLC	Member Units		—			(1,140	)		179		6,040		—		1,140		4,900

Clad-Rex Steel, LLC	LIBOR Plus 9.50% (Floor 1.00)		—			112			1,542		14,337		143		1,200		13,280
	Member Units		—			2,220			520		7,280		2,220		—		9,500
	10% Secured Debt		—			12			119		1,190		12		19		1,183
	Member Units		—			70			—		210		70		—		280

CMS Minerals Investments	Preferred Member Units		1,405			(1,578	)		96		3,682		—		3,682		—
	Member Units		—			(600	)		212		3,381		—		989		2,392

Gamber-Johnson Holdings, LLC	LIBOR Plus 11.00% (Floor 1.00%)		—			187			2,988		23,846		235		681		23,400
	Member Units		—			4,450			592		18,920		4,450		—		23,370

GRT Rubber Technologies LLC	LIBOR Plus 9.00% (Floor 1.00%)		—			(34	)		1,314		13,274		34		1,705		11,603
	Member Units		—			1,660			746		20,310		1,660		—		21,970

Harborside Holdings, LLC	Member Units		—			3,194			—		—		9,400		—		9,400

Hydratec, Inc.	Common Stock		—			(640	)		1,631		15,640		—		640		15,000

IDX Broker, LLC	11.5% Secured Debt		—			88			1,316		10,950		5,500		1,200		15,250
	Preferred Member Units		—			4,274			136		7,040		4,620		—		11,660

Jensen Jewelers of Idaho, LLC	Prime Plus 6.75% (Floor 2.00%)		—			(20	)		451		4,055		520		620		3,955
	Member Units		—			640			207		4,460		640		—		5,100

Lamb Ventures, LLC	11% Secured Debt		—			52			994		7,657		2,850		565		9,942
	Preferred Equity		—			—			—		400		—		—		400
	Member Units		—			800			40		5,990		800		—		6,790
	9.5% Secured Debt		—			4			65		1,170		432		1,170		432
	Member Units		—			(820	)		845		1,340		—		820		520

Lighting Unlimited, LLC	8% Secured Debt		—			—			29		1,514		—		1,514		—
	Preferred Equity		(434	)		24			—		410		24		434		—
	Warrants		(54	)		54			—		—		54		54		—
	Member Units		(100	)		100			—		—		100		100		—

Mid-Columbia Lumber	10% Secured Debt		—			—			176		1,750		593		953		1,390
Products, LLC	12% Secured Debt		—			—			477		3,900		—		37		3,863
	Member Units		—			(1,500	)		6		2,480		595		1,500		1,575
	9.5% Secured Debt		—			—			78		836		—		45		791
	Member Units		—			150			72		600		690		—		1,290

MSC Adviser I, LLC	Member Units		—			11,151			3,032		30,617		11,151		—		41,768

Mystic Logistics Holdings, LLC	12% Secured Debt		—			(124	)		1,073		9,176		52		1,532		7,696
	Common Stock		—			1,040			—		5,780		1,040		—		6,820

NRP Jones, LLC	12% Secured Debt		—			—			4,117		13,915		7,821		15,360		6,376
	Warrants		—			687			—		130		687		817		—
	Member Units		—			2,023			18		410		2,840		—		3,250

PPL RVs, Inc.	LIBOR Plus 7.00% (Floor 0.50%)		—			128			1,473		17,826		174		1,900		16,100
	Common Stock		—			660			80		11,780		660		—		12,440

Principle Environmental, LLC	13% Secured Debt		—			131			998		7,438		39		—		7,477
(d/b.a TruHorizon	Preferred Member Units		(63	)		6,183			—		5,370		6,183		63		11,490
Environmental Solutions)	Warrants		—			380			—		270		380		—		650

Quality Lease Service, LLC	Zero Coupon Secured Debt		—			(391	)		273		7,068		273		391		6,950
	Member Units		—			—			—		3,188		1,750		—		4,938

The MPI Group, LLC	9% Secured Debt		—			(513	)		268		2,922		1		513		2,410
	Series A Preferred Units		—			—			—		—		—		—		—
	Warrants		—			—			—		—		—		—		—
	Member Units		—			90			92		2,300		89		—		2,389

Uvalco Supply, LLC	9% Secured Debt		—			—			54		872		—		524		348
	Member Units		69			(496	)		235		4,640		—		760		3,880

Company	Investment(1)

Vision Interests, Inc.	13% Secured Debt	—		—		382		2,814	—	17	2,797
	Series A Preferred Stock	—		—		—		3,000	—	—	3,000
	Common Stock	—		—		—		—	—	—	—

Ziegler's NYPD, LLC	6.5% Secured Debt	—		—		68		994	2	—	996
	12% Secured Debt	—		—		37		300	—	—	300
	14% Secured Debt	—		—		390		2,750	—	—	2,750
	Warrants	—		(240	)	—		240	—	240	—
	Preferred Member Units	—		(880	)	—		4,100	—	880	3,220

*Other controlled investments*

Access Media Holdings, LLC	5% Current/5% PIK Secured Debt	—		(3,714	)	2,379		19,700	1,164	3,714	17,150
	Preferred Member Units	—		(1,908	)	—		240	1,668	1,908	—
	Member Units	—		—		—		—	—	—	—

Ameritech College Operations, LLC	13% Secured Debt	—		—		96		1,003	—	1,003	—
	13% Secured Debt	—		—		285		3,025	—	3,025	—
	Preferred Member Units	(3,321	)	—		198		2,291	3,900	6,191	—

ASC Interests, LLC	11% Secured Debt	—		(16	)	232		2,100	11	316	1,795
	Member Units	—		(1,150	)	(12	)	2,680	—	1,150	1,530

ATS Workholding, LLC	5% Secured Debt	—		—		36		—	3,249	—	3,249
	Preferred Member Units	—		—		—		—	3,726	—	3,726

Bond-Coat, Inc.	12% Secured Debt	—		(40	)	1,450		11,596	40	40	11,596
	Common Stock	—		2,710		—		6,660	2,710	—	9,370

CBT Nuggets, LLC	Member Units	—		34,080		9,439		55,480	34,080	—	89,560

Charps, LLC	12% Secured Debt	—		—		2,371		—	19,025	800	18,225
	Preferred Member Units	—		250		—		—	650	—	650

Copper Trail Energy Fund I, LP	LP Interests	—		—		—		—	2,500	—	2,500

Datacom, LLC	8% Secured Debt	—		—		101		900	945	270	1,575
	5.25% Current / 5.25% PIK Secured Debt	—		(599	)	1,296		11,049	660	599	11,110
	Class A Preferred Member Units	—		(638	)	—		1,368	—	638	730
	Class B Preferred Member Units	—		(1,529	)	—		1,529	—	1,529	—

Garreco, LLC	LIBOR Plus 10.00% (Floor 1.00%)	—		—		702		5,219	991	767	5,443
	Member Units	—		790		—		1,150	790	—	1,940

Gulf Manufacturing, LLC	9% PIK Secured Debt	—		—		51		777	—	777	—
	Member Units	—		1,290		437		8,770	1,290	—	10,060

Gulf Publishing Holdings, LLC	LIBOR Plus 9.50% (Floor 1.00%)	—		—		5		—	80	—	80
	12.5% Secured Debt	—		—		1,557		9,911	2,792	—	12,703
	Member Units	—		1,159		40		3,124	1,716	—	4,840

Harrison Hydra-Gen, Ltd.	Common Stock	—		460		—		3,120	460	—	3,580

Hawthorne Customs and Dispatch	Member Units	(159	)	309		—		280	309	589	—
Services, LLC	Member Units	632		(825	)	127		2,040	—	2,040	—

HW Temps LLC	LIBOR Plus 11.00% (Floor 1.00%)	—		—		1,430		10,500	18	600	9,918
	Preferred Member Units	—		—		140		3,940	—	—	3,940

Indianapolis Aviation Partners, LLC	15% Secured Debt	—		—		292		3,100	—	3,100	—
	Warrants	2,384		(1,520	)	—		2,649	—	2,649	—

KBK Industries, LLC	10% Secured Debt	—		3		100		1,250	100	975	375
	12.5% Secured Debt	—		33		788		5,889	11	—	5,900
	Member Units	—		1,197		183		2,780	1,640	—	4,420

Marine Shelters Holdings, LLC	12% PIK Secured Debt	—		(2,551	)	—		9,387	—	9,387	—
	Preferred Member Units	(100	)	—		—		—	100	100	—

Market Force Information, LLC	LIBOR Plus 11.00% (Floor 1.00%)	—		—		1,541		—	23,815	672	23,143
	Member Units	—		—		—		—	14,700	—	14,700

MH Corbin Holding LLC	13% Secured Debt	—		—		2,030		13,197	29	700	12,526
	Preferred Member Units	—		—		140		6,000	—	—	6,000

NAPCO Precast, LLC	LIBOR Plus 8.50%	—		36		917		—	11,475	—	11,475
	Prime Plus 2.00% (Floor 7.00%)	—		(20	)	122		2,713	20	2,733	—
	18% Secured Debt	—		(30	)	327		3,952	30	3,982	—
	Member Units	—		750		393		10,920	750	—	11,670

NRI Clinical Research, LLC	LIBOR Plus 6.50% (Floor 1.50%)	—		—		36		200	200	—	400
	14% Secured Debt	—		(33	)	650		4,261	33	429	3,865
	Warrants	—		(180	)	—		680	—	180	500
	Member Units	—		38		—		2,462	360	322	2,500

NuStep, LLC	12% Secured Debt	—		—		2,646		—	20,420	—	20,420
	Preferred Member Units	—		—		—		—	10,200	—	10,200

OMi Holdings, Inc.	Common Stock	—		1,030		1,081		13,080	1,030	—	14,110

Company	Investment(1)	Amount of Realized Gain/(Loss)			Amount of Unrealized Gain/(Loss)			Amount of Interest, Fee or Dividends Credited to Income(2)		December 31, 2016 Fair Value		Gross Additions(3)		Gross Reductions(4)		December 31, 2017 Fair Value

*Affiliate Investments*

AFG Capital Group, LLC	Warrants	$	—		$	840		$	—	$	670	$	190	$	—	$	860
	Member Units		—			190			34		2,750		840		—		3,590

Barfly Ventures, LLC	12% Secured Debt		—			176			1,005		5,827		2,888		—		8,715
	Options		—			430			—		490		430		—		920
	Warrants		—			240			—		280		240		—		520

BBB Tank Services, LLC	LIBOR Plus 8.00% (Floor 1.00%)		—			—			84		797		861		880		778
	15% Secured Debt		—			—			623		3,991		—		115		3,876
	Member Units		—			(300	)		—		800		—		300		500

Boccella Precast Products LLC	LIBOR Plus 10.0% (Floor 1.00%)		—			170			1,203		—		16,400		—		16,400
	Member Units		—			1,280			37		—		3,440		—		3,440

Boss Industries, LLC	Preferred Member Units		—			1,476			193		2,800		1,667		537		3,930

Bridge Capital Solutions Corporation	13% Secured Debt		—			—			1,262		5,610		274		—		5,884
	Warrants		—			151			—		3,370		150		—		3,520
	13% Secured Debt		—			(2	)		133		1,000		2		2		1,000
	Preferred Member Units		—			—			100		1,000		—		—		1,000

Buca C, LLC	LIBOR Plus 7.25% (Floor 1.00%)		—			(167	)		1,891		22,671		56		2,534		20,193
	Preferred Member Units		—			(728	)		240		4,660		240		728		4,172

CAI Software LLC	12% Secured Debt		—			—			456		3,683		800		400		4,083
	Member Units		—			750			87		2,480		750		—		3,230

Chandler Signs Holdings, LLC	12% Secured Debt		—			(7	)		555		4,500		7		7		4,500
	Class A Units		—			(590	)		13		3,240		—		590		2,650

Condit Exhibits, LLC	Member Units		—			110			41		1,840		110		—		1,950

Congruent Credit Opportunities	LP Interests (Fund II)		—			(3	)		2		1,518		—		3		1,515
Funds	LP Interests (Fund III)		—			336			1,555		16,181		2,451		—		18,632

Daseke, Inc.	12% Current / 2.5% PIK Secured Debt		—			(167	)		676		21,799		255		22,054		—
	Common Stock		22,859			(18,849	)		—		24,063		—		24,063		—

Dos Rios Partners	LP Interests (Dos Rios Partners, LP)		—			2,240			—		4,925		2,240		—		7,165
	LP Interests (Dos Rios Partners — A, LP)		—			445			—		1,444		445		—		1,889

Dos Rios Stone Products LLC	Class A Units		—			(280	)		23		2,070		—		280		1,790

East Teak Fine Hardwoods, Inc.	Common Stock		—			(230	)		66		860		—		230		630

East West Copolymer &	12% Current/2% PIK Secured Debt		(3,626	)		961			—		8,630		961		9,591		—
Rubber, LLC	Warrants		(50	)		50			—		—		50		50		—

EIG Fund Investments	LP Interests (EIG Global Private Debt fund-A, L.P.)		71			(48	)		90		2,804		1,160		2,909		1,055
	LP Interests (EIG Traverse Co-Investment, L.P.)		—			(100	)		1,534		9,905		—		9,905		—

Freeport Financial Fund Investments	LP Interests (Freeport Financial SBIC Fund LP)		—			(6	)		408		5,620		—		6		5,614
	LP Interests (Freeport First Lien Loan Fund III LP)		—			(52	)		688		4,763		3,795		52		8,506

Gault Financial, LLC (RMB	10.5% Current Secured Debt		—			1,016			1,302		11,079		1,016		563		11,532
Capital, LLC)	Warrants		—			—			—		—		—		—		—

Glowpoint, Inc.	12% Secured Debt		(6,450	)		4,951			685		3,997		5,003		9,000		—
	Common Stock		(3,974	)		1,878			—		2,080		1,878		3,958		—

Guerdon Modular Holdings, Inc.	13% Secured Debt		—			—			1,450		10,594		38		—		10,632
	Preferred Stock		—			(1,140	)		—		1,140		—		1,140		—
	Common Stock		—			(80	)		—		80		—		80		—

Hawk Ridge Systems, LLC	11% Secured Debt		—			125			1,229		9,901		4,899		500		14,300
	Preferred Member Units		—			950			320		2,850		950		—		3,800
	Preferred Member Units		—			50			6		150		50		—		200

Houston Plating and Coatings, LLC	8% Unsecured Convertible Debt		—			200			165		—		3,200		—		3,200
	Member Units		—			1,390			5		4,000		2,140		—		6,140

HPEP 3, L.P.	LP Interests		—			—			—		—		1,343		400		943

I-45 SLF LLC	Member Units		—			255			2,881		14,586		2,255		—		16,841

Indianhead Pipeline Services, LLC	12% Secured Debt		—			—			947		5,079		562		5,641		—
	Preferred Member Units		—			(338	)		514		2,677		514		3,191		—
	Warrants		134			459			—		—		459		459		—
	Member Units		272			1			—		—		1		1		—

L.F. Manufacturing Holdings, LLC	Member Units		—			620			—		1,380		620		—		2,000

Meisler Operating LLC	LIBOR Plus 8.50% (Floor 1.00%)		—			—			1,249		—		16,633		—		16,633
	Member Units		—			190			—		—		3,390		—		3,390

Company	Investment(1)	Amount of Realized Gain/(Loss)			Amount of Unrealized Gain/(Loss)			Amount of Interest, Fee or Dividends Credited to Income(2)		December 31, 2016 Fair Value		Gross Additions(3)		Gross Reductions(4)		December 31, 2017 Fair Value

OnAsset Intelligence, Inc.	12% PIK Secured Debt		(29	)		—			576		4,519		575		—		5,094
	10% PIK Secured Debt		—			—			3		—		48		—		48
	Preferred Stock		—			—			—		—		—		—		—
	Warrants		—			—			—		—		—		—		—

OPI International Ltd.	10% Unsecured Debt		(86	)		(473	)		16		473		—		473		—
	Common Stock		—			(1,600	)		—		1,600		—		1,600		—

PCI Holding Company, Inc.	12% Secured Debt		—			(102	)		1,922		13,000		345		752		12,593
	Preferred Stock		—			(5,028	)		548		5,370		548		5,028		890
	Preferred Stock		—			870			—		—		2,610		—		2,610

Rocaceia, LLC (Quality Lease and	12% Secured Debt		—			—			—		250		—		—		250
Rental Holdings, LLC)	Preferred Member Units		—			—			—		—		—		—		—

Tin Roof Acquisition Company	12% Secured Debt		—			—			1,656		13,385		66		729		12,722
	Class C Preferred Stock		—			—			288		2,738		289		—		3,027

UniTek Global Services, Inc.	LIBOR Plus 8.50% (Floor 1.00%)		—			(5	)		722		5,021		3,519		5		8,535
	LIBOR Plus 7.50% (Floor 1.00%)		—			—			9		824		3		690		137
	15% PIK Unsecured Debt		—			—			129		745		120		—		865
	Preferred Stock		—			(637	)		1,547		6,410		1,547		637		7,320
	Preferred Stock		—			(8	)		339		—		2,858		8		2,850
	Common Stock		—			(520	)		—		3,010		—		520		2,490

Universal Wellhead Services	Preferred Member Units		—			109			—		720		110		—		830
Holdings, LLC	Member Units		—			1,300			—		610		1,300		—		1,910

Valley Healthcare Group, LLC	LIBOR Plus 12.50% (Floor 0.50%)		—			—			1,728		12,844		31		1,190		11,685
	Preferred Member Units		—			—			—		1,600		—		—		1,600

Volusion, LLC	11.5% Secured Debt		—			—			2,659		15,298		668		766		15,200
	Preferred Member Units		—			—			—		14,000		—		—		14,000
	Warrants		—			(496	)		—		2,576		—		496		2,080

Other
Amounts related to investments transferred to or from other 1940 Act classification during the period			(1,077	)		(3,582	)		1,615		24,321		—		—		—

		$	8,044		$	(11,329	)	$	37,509	$	375,948	$	100,290	$	113,063	$	338,854



Total Non-Control/Non-Affiliate investments		$	7,879		$	(9,751	)	$	105,470



Total Portfolio Investments		$	16,182		$	42,545		$	205,741

This schedule should be read in conjunction with Main Street's consolidated financial statements, including the consolidated schedule of investments and notes to the consolidated financial statements.

(1): The principal amount, the ownership detail for equity investments and if the investment is income producing is included in the consolidated schedule of investments.
(2): Represents the total amount of interest, fees and dividends credited to income for the portion of the period for which an investment was included in Control or Affiliate categories, respectively. For investments transferred between Control and Affiliate categories during the period, any income or investment balances related to the time period it was in the category other than the one shown at period end is included in "Amounts from investments transferred from other 1940 Act classifications during the period."
(3): Gross additions include increases in the cost basis of investments resulting from new portfolio investments, follow-on investments and accrued PIK interest, and the exchange of one or more existing securities for one or more new securities. Gross additions also include net increases in unrealized appreciation or net decreases in net unrealized depreciation as well as the movement of an existing portfolio company into this category and out of a different category.
(4): Gross reductions include decreases in the cost basis of investments resulting from principal repayments or sales and the exchange of one or more existing securities for one or more new securities. Gross reductions also include net increases in net unrealized depreciation or net decreases in unrealized appreciation as well as the movement of an existing portfolio company out of this category and into a different category.

MAIN STREET CAPITAL CORPORATION

Consolidated Schedule of Investments In and Advances to Affiliates
December 31, 2016
(dollars in thousands)

Company	Investment(1)	Amount of Realized Gain/(Loss)		Amount of Unrealized Gain/(Loss)			Amount of Interest, Fees or Dividends Credited to Income(2)			December 31, 2015 Fair Value		Gross Additions(3)		Gross Reductions(4)		December 31, 2016 Fair Value

Control Investments

*Majority-owned investments*

Café Brazil, LLC	Member Units	$	—	$	(1,290	)	$	429		$	7,330	$	—	$	1,290	$	6,040

Clad-Rex Steel, LLC	LIBOR Plus 9.50%		—		—			5			—		396		—		396
	LIBOR Plus 9.50%		—		—			192			—		13,941		—		13,941
	Member Units		—		—			—			—		7,280		—		7,280
	10% Secured Debt		—		—			4			—		1,190		—		1,190
	Member Units		—		—			—			—		210		—		210

CMS Minerals Investments	Member Units		—		(448	)		178			—		4,083		702		3,381
	Preferred Member Units		—		(2,369	)		1,239			6,914		—		3,232		3,682

Gamber-Johnson Holdings, LLC	LIBOR Plus 11.00% (Floor 1.00%)		—		—			1,551			—		23,846		—		23,846
	Member Units		—		4,076			404			—		18,920		—		18,920

GRT Rubber Technologies LLC	LIBOR Plus 9.00% (Floor 1.00%)		—		86			1,465			15,988		134		2,848		13,274
	Member Units		—		4,730			949			15,580		4,730		—		20,310

Hydratec, Inc.	Common Stock		—		690			1,631			14,950		690		—		15,640

IDX Broker, LLC	12.5% Secured Debt		—		(23	)		1,460			11,350		23		423		10,950
	Member Units		—		600			136			6,440		600		—		7,040

Jensen Jewelers of Idaho, LLC	Prime Plus 6.75% (Floor 2.00%)		—		32			475			4,055		500		500		4,055
	Member Units		—		(290	)		209			4,750		—		290		4,460

Lamb Ventures, LLC	LIBOR Plus 5.75%		—		—			7			—		351		351		—
	11% Secured Debt		—		—			869			7,962		—		305		7,657
	Preferred Equity		—		—			—			328		72		—		400
	Member Units		—		1,300			90			4,690		1,300		—		5,990
	9.5% Secured Debt		—		—			86			919		300		49		1,170
	Member Units		—		100			362			1,240		100		—		1,340

Lighting Unlimited, LLC	8% Secured Debt		—		—			123			1,514		—		—		1,514
	Preferred Equity		—		(20	)		—			430		—		20		410
	Warrants		—		(40	)		—			40		—		40		—
	Member Units		—		(350	)		(81	)		350		—		350		—

Mid-Columbia Lumber	10% Secured Debt		—		—			178			1,750		—		—		1,750
Products, LLC	12% Secured Debt		—		—			476			3,900		—		—		3,900
	Member Units		—		(666	)		5			2,580		566		666		2,480
	9.5% Secured Debt		—		—			83			881		—		45		836
	Member Units		—		50			23			550		50		—		600

MSC Adviser I, LLC	Member Units		—		3,345			2,829			27,272		3,345		—		30,617

Mystic Logistics Holdings, LLC	12% Secured Debt		—		(42	)		1,184			9,448		42		314		9,176
	Common Stock		—		(190	)		—			5,970		—		190		5,780

NRP Jones, LLC	6% Current / 6% PIK Secured Debt		—		—			1,921			12,948		967		—		13,915
	Warrants		—		(320	)		—			450		—		320		130
	Member Units		—		(1,070	)		—			1,480		—		1,070		410

PPL RVs, Inc.	11.1% Secured Debt		—		—			913			9,710		—		9,710		—
	LIBOR Plus 7.00% (Floor 0.50%)		—		—			234			—		17,826		—		17,826
	Common Stock		—		2,010			261			9,770		2,010		—		11,780

Principle Environmental, LLC	12% Secured Debt		—		(21	)		516			4,060		21		21		4,060
	12% Current / 2% PIK Secured Debt		—		(1	)		473			3,310		69		1		3,378
	Preferred Member Units		—		(690	)		—			6,060		—		690		5,370
	Warrants		—		(40	)		—			310		—		40		270

Quality Lease Service, LLC	8% PIK Secured Debt		—		—			530			6,538		530		—		7,068
	Member Units		—		—			—			2,638		550		—		3,188

Southern RV, LLC	13% Secured Debt		—		(104	)		157			11,400		104		11,504		—
	Member Units		13,918		(13,420	)		957			15,100		—		15,100		—
	13% Secured Debt		—		(720	)		45			3,250		30		3,280		—
	Member Units		440		(30	)		—			1,200		—		1,200		—

Company	Investment(1)

The MPI Group, LLC	9% Secured Debt	—	—		269		2,921	1	—	2,922
	Series A Preferred Units	—	(690	)	—		690	—	690	—
	Warrants	—	—		—		—	—	—	—
	Member Units	—	70		129		2,230	70	—	2,300

Travis Acquisition LLC	12% Secured Debt	—	(43	)	340		3,513	43	3,556	—
	Member Units	17,862	(7,380	)	2,812		14,480	—	14,480	—

Uvalco Supply, LLC	9% Secured Debt	—	—		97		1,314	—	442	872
	Member Units	—	(820	)	120		5,460	—	820	4,640

Vision Interests, Inc.	13% Secured Debt	—	—		412		3,052	19	257	2,814
	Series A Preferred Stock	—	(550	)	—		3,550	—	550	3,000
	Common Stock	—	(210	)	—		210	—	210	—

Ziegler's NYPD, LLC	6.5% Secured Debt	—	—		68		992	2	—	994
	12% Secured Debt	—	—		46		500	—	200	300
	14% Secured Debt	—	—		391		2,750	—	—	2,750
	Warrants	—	190		—		50	190	—	240
	Preferred Member Units	—	700		—		3,400	700	—	4,100

*Other controlled investments*

Access Media Holdings, LLC	5.00% Current / 5.00% PIK Secured Debt	—	(1,790	)	2,270		20,380	1,110	1,790	19,700
	Preferred Member Units	—	(3,841	)	—		2,000	2,081	3,841	240
	Member Units	—	—		—		—	—	—	—

Ameritech College Operations, LLC	10% Secured Debt	—	—		52		514	—	—	514
	13% Secured Debt	—	—		315		3,025	—	—	3,025
	13% Secured Debt	—	—		51		489	—	—	489
	Preferred Member Units	—	—		(5	)	2,291	—	—	2,291

ASC Interests, LLC	11% Secured Debt	—	(14	)	271		2,500	14	414	2,100
	Member Units	—	450		95		2,230	450	—	2,680

Bond-Coat, Inc.	12% Secured Debt	—	(35	)	1,450		11,596	35	35	11,596
	Common Stock	—	(2,480	)	—		9,140	—	2,480	6,660

CBT Nuggets, LLC	Member Units	—	13,360		7,425		42,120	13,360	—	55,480

Datacom, LLC	8% Secured Debt	—	—		53		—	900	—	900
	5.25% Current / 5.25% PIK Secured Debt	—	(450	)	1,193		10,970	529	450	11,049
	Class A Preferred Member Units	—	188		—		1,181	187	—	1,368
	Class B Preferred Member Units	—	(3,550	)	—		5,079	—	3,550	1,529

Garreco, LLC	14% Secured Debt	—	—		838		5,739	30	550	5,219
	Member Units	—	(120	)	—		1,270	—	120	1,150

Gulf Manufacturing, LLC	9% PIK Secured Debt	—	—		71		777	—	—	777
	Member Units	—	(5,000	)	51		13,770	—	5,000	8,770

Gulf Publishing Holdings, LLC	12.5% Secured Debt	—	—		969		—	9,911	—	9,911
	Member Units	—	—		62		—	3,124	—	3,124

Harrison Hydra-Gen, Ltd.	9% Secured Debt	—	—		9		5,010	—	5,010	—
	Preferred Stock	—	—		2		1,361	2	1,363	—
	Common Stock	—	520		69		2,600	520	—	3,120

Hawthorne Customs and Dispatch	Member Units	—	(180	)	—		460	—	180	280
Services, LLC	Member Units	—	(180	)	188		2,220	—	180	2,040

HW Temps LLC	LIBOR Plus 13% (Floor 1.00%)	—	—		1,172		9,884	816	200	10,500
	Preferred Member Units	—	(2	)	389		3,942	—	2	3,940

Indianapolis Aviation Partners, LLC	15% Secured Debt	—	(5	)	636		3,100	5	5	3,100
	Warrants	—	109		—		2,540	109	—	2,649

Marine Shelters Holdings, LLC	12% PIK Secured Debt	—	(430	)	895		8,870	947	430	9,387
	Preferred Member Units	—	(4,881	)	—		4,881	—	4,881	—

MH Corbin Holding LLC	10% Secured Debt	—	—		1,409		13,869	28	700	13,197
	Preferred Member Units	—	—		140		6,000	—	—	6,000

NAPCO Precast, LLC	Prime Plus 2.00% (Floor 7.00%)	—	19		283		4,005	—	1,292	2,713
	18% Secured Debt	—	28		794		4,924	—	972	3,952
	Member Units	—	2,330		687		8,590	2,330	—	10,920

NRI Clinical Research, LLC	LIBOR Plus 6.50% (Floor 1.50%)	—	—		8		—	200	—	200
	14% Secured Debt	—	33		683		4,539	78	356	4,261
	Warrants	—	340		—		340	340	—	680
	Member Units	—	1,120		—		1,342	1,120	—	2,462

OMi Holdings, Inc.	Common Stock	—	(560	)	480		13,640	—	560	13,080

Pegasus Research Group, LLC	Member Units	—	1,780		243		6,840	1,780	—	8,620

Company	Investment(1)	Amount of Realized Gain/(Loss)		Amount of Unrealized Gain/(Loss)			Amount of Interest, Fee or Dividends Credited to Income(2)			December 31, 2015 Fair Value		Gross Additions(3)		Gross Reductions(4)		December 31, 2016 Fair Value

*Affiliate Investments*

AFG Capital Group, LLC	11% Secured Debt	$	—	$	(179	)	$	1,313		$	12,790	$	349	$	13,139	$	—
	Warrants		—		180			—			490		180		—		670
	Member Units		—		730			40			2,020		730		—		2,750

Barfly Ventures, LLC	12% Secured Debt		—		(33	)		1,053			4,042		1,818		33		5,827
	Options		—		93			—			—		490		—		490
	Warrants		—		(193	)		—			473		—		193		280

BBB Tank Services, LLC	LIBOR Plus 9.50% (Floor 1.00%)		—		—			22			—		797		—		797
	15% Secured Debt		—		—			439			—		3,991		—		3,991
	Member Units		—		—			—			—		800		—		800

Boss Industries, LLC	Preferred Member Units		—		34			264			2,586		214		—		2,800

Bridge Capital Solutions Corporation	13% Secured Debt		—		—			1,293			6,890		5,720		7,000		5,610
	Warrants		—		138			—			1,300		2,070		—		3,370
	13% Secured Debt		—		9			73			—		1,000		—		1,000
	Preferred Member Units		—		—			44			—		1,000		—		1,000

Buca C, LLC	LIBOR Plus 7.25% (Floor 1.00%)		—		167			2,087			25,299		531		3,159		22,671
	Preferred Member Units		—		723			226			3,711		949		—		4,660

CAI Software LLC	12% Secured Debt		—		(13	)		507			4,661		14		992		3,683
	Member Units		—		1,480			102			1,000		1,480		—		2,480

CapFusion, LLC	13% Secured Debt		—		—			1,547			—		13,202		—		13,202
	Warrants		—		—			—			—		1,200		—		1,200

Chandler Signs Holdings, LLC	12% Secured Debt		—		39			595			—		4,500		—		4,500
	Class A Units		—		1,740			149			—		3,240		—		3,240

Condit Exhibits, LLC	Member Units		—		830			175			1,010		830		—		1,840

Congruent Credit Opportunities	LP Interests (Fund II)		—		(434	)		400			2,834		—		1,316		1,518
Funds	LP Interests (Fund III)		—		423			1,115			12,024		4,157		—		16,181

Daseke, Inc.	12% Current / 2.5% PIK Secured Debt		—		(84	)		3,252			21,253		629		83		21,799
	Common Stock		—		1,403			—			22,660		1,403		—		24,063

Dos Rios Partners	LP Interests (Dos Rios Partners, LP)		—		2			—			2,031		2,894		—		4,925
	LP Interests (Dos Rios Partners — A, LP)		—		(122	)		—			648		918		122		1,444

Dos Rios Stone Products LLC	Class A Units		—		70			57			—		2,070		—		2,070

East Teak Fine Hardwoods, Inc.	Common Stock		—		—			41			860		—		—		860

East West Copolymer &	12% Current / 2% PIK Secured Debt		—		(961	)		1,302			9,463		127		960		8,630
Rubber, LLC	Warrants		—		(50	)		—			50		—		50		—

EIG Fund Investments	LP Interests		—		—			243			718		2,086		—		2,804

EIG Traverse Co-Investment, L.P.	LP Interests		—		100			1,175			4,755		5,150		—		9,905

Freeport Financial Fund Investments	LP Interests (Freeport Financial SBIC Fund LP)		—		(425	)		398			6,045		—		425		5,620
	LP Interests (Freeport First Lien Loan Fund III LP)		—		—			478			2,077		2,686		—		4,763

Gault Financial, LLC (RMB	10% Secured Debt		—		—			1,532			10,930		149		—		11,079
Capital, LLC)	Warrants		—		—			—			—		—		—		—

Glowpoint, Inc.	8% Secured Debt		—		—			21			397		1		398		—
	12% Secured Debt		—		(4,951	)		1,125			8,929		22		4,954		3,997
	Common Stock		—		(1,760	)		—			3,840		—		1,760		2,080

Guerdon Modular Holdings, Inc.	9% Current / 4% PIK Secured Debt		—		—			1,463			10,280		1,274		960		10,594
	Preferred Stock		—		—			—			—		1,140		—		1,140
	Common Stock		—		(1,910	)		—			1,990		—		1,910		80

Hawk Ridge Systems, LLC	10% Secured Debt		—		—			184			—		9,901		—		9,901
	Preferred Member Units		—		—			28			—		2,850		—		2,850
	Preferred Member Units		—		—			—			—		150		—		150

Houston Plating and Coatings, LLC	Member Units		—		(4,873	)		(22	)		8,440		433		4,873		4,000

I-45 SLF LLC	Member Units		—		386			1,964			7,200		7,386		—		14,586

Indianhead Pipeline Services, LLC	12% Secured Debt		—		—			1,548			5,853		126		900		5,079
	Preferred Member Units		—		338			37			2,302		375		—		2,677
	Warrants		—		—			—			—		—		—		—
	Member Units		—		—			—			—		—		—		—

KBK Industries, LLC	10% Secured Debt		—		—			51			—		1,550		300		1,250
	12.5% Secured Debt		—		(25	)		763			5,900		14		25		5,889
	Member Units		—		(900	)		(8	)		3,680		—		900		2,780

L.F. Manufacturing Holdings, LLC	Member Units		—		(105	)		—			1,485		—		105		1,380

Company	Investment(1)	Amount of Realized Gain/(Loss)			Amount of Unrealized Gain/(Loss)			Amount of Interest, Fee or Dividends Credited to Income(2)			December 31, 2015 Fair Value			Gross Additions(3)		Gross Reductions(4)		December 31, 2016 Fair Value

MPS Denver, LLC	Member Units		(1,254	)		—			—			1,130			124		1,254		—

OnAsset Intelligence, Inc.	12% PIK Secured Debt		—			—			512			4,006			513		—		4,519
	Preferred Stock		—			(1,380	)		—			1,380			—		1,380		—
	Warrants		—			—			—			—			—		—		—

OPI International Ltd.	10% Unsecured Debt		—			—			48			473			—		—		473
	Common Stock		—			(1,600	)		—			3,200			—		1,600		1,600

PCI Holding Company, Inc.	12% Secured Debt		—			102			1,354			—			13,000		—		13,000
	Preferred Stock		—			(134	)		617			4,887			617		134		5,370

Radial Drilling Services Inc.	12% Secured Debt		(1,433	)		2,441			20			1,500			2,461		3,961		—
	Warrants		(760	)		758			—			—			758		758		—

Rocaceia, LLC (Quality Lease and	12% Secured Debt		—			—			—			250			—		—		250
Rental Holdings, LLC)	Preferred Member Units		(2	)		—			—			—			—		—		—

Samba Holdings, Inc.	12.5% Secured Debt		—			(110	)		1,100			24,662			110		24,772		—
	Common Stock		28,707			(28,133	)		—			30,220			—		30,220		—

Tin Roof Acquisition Company	12% Secured Debt		—			—			1,735			13,807			62		484		13,385
	Class C Preferred Stock		—			—			262			2,477			261		—		2,738

UniTek Global Services, Inc.	LIBOR Plus 7.50% (Floor 1.00%)		—			25			254			2,812			2,209		—		5,021
	LIBOR Plus 8.50% (Floor 1.00%)		—			6			108			1,255			16		447		824
	15% PIK Unsecured Debt		—			3			113			638			107		—		745
	Preferred Stock		—			(8	)		878			5,540			878		8		6,410
	Common Stock		—			3,010			—			—			3,010		—		3,010

Universal Wellhead Services	Member Units		—			(3,390	)		—			—			4,000		3,390		610
Holdings, LLC	Preferred Member Units		(91	)		1,003			—			3,000			1,811		4,091		720

Valley Healthcare Group, LLC	LIBOR Plus 12.50% (Floor 0.50%)		—			—			1,519			10,297			2,647		100		12,844
	Preferred Member Units		—			—			—			—			1,600		—		1,600

Volusion, LLC	11.5% Secured Debt		—			—			2,451			16,199			—		901		15,298
	Preferred Member Units		—			—			—			14,000			—		—		14,000
	Warrants		—			—			—			1,400			1,176		—		2,576

Other
Amounts related to investments transferred to or from other 1940 Act classification during the period			—			—			(345	)		(15,530	)		—		—		—

		$	25,167		$	(35,540	)	$	37,702		$	350,519		$	127,956	$	118,057	$	375,948



Total Non-Control/Non-Affiliate investments		$	(26,317	)	$	39,909		$	88,242



Total Portfolio Investments		$	31,070		$	(8,305	)	$	178,165

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

(a) Evaluation of Disclosure Controls and Procedures. As of the end of the period covered by this annual report on Form 10-K, our Chief Executive Officer, Chief Financial Officer, Chief Compliance Officer and Chief Accounting Officer conducted an evaluation of our disclosure controls and procedures (as defined in Rules 13a-15(e) of the Securities Exchange Act of 1934). Based upon this evaluation, our Chief Executive Officer, Chief Financial Officer, Chief Compliance Officer and Chief Accounting Officer concluded that our disclosure controls and procedures are effective to allow timely decisions regarding required disclosure of any material information relating to us that is required to be disclosed by us in the reports we file or submit under the Securities Exchange Act of 1934.

(b) Management's Report on Internal Control Over Financial Reporting. The management of Main Street Capital Corporation and its subsidiaries (the Company) is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rules 13a-15(f). Under the supervision and with the participation of management, including the Chief Executive Officer and Chief Financial Officer, the Company conducted an evaluation of the effectiveness of the Company's internal control over financial reporting based on the criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Based on the Company's evaluation under the framework in Internal Control — Integrated Framework, management concluded that the Company's internal control over financial reporting was effective as of December 31, 2017. Grant Thornton, LLP, the Company's independent registered public accounting firm, has issued an attestation report on the effectiveness of the Company's internal control over financial reporting as of December 31, 2017, as stated in its report which is included herein.

(c) Attestation Report of the Registered Public Accounting Firm. Our independent registered public accounting firm, Grant Thornton LLP, has issued an attestation report on the effectiveness of our internal control over financial reporting, which is set forth above under the heading "Reports of Independent Registered Public Accounting Firm" in Item 8.

(d) Changes in Internal Control over Financial Reporting. There have been no changes in our internal control over financial reporting (as defined in Rule 13a-15(f) of the Securities Exchange Act of 1934) that occurred during our most recently completed fiscal quarter, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

The information required by this Item will be contained in the definitive proxy statement relating to our 2017 annual meeting of stockholders (the "Proxy Statement") under the headings "Election of Directors," "Corporate Governance," "Executive Officers" and "Section 16(a) Beneficial Ownership Reporting Compliance," to be filed with the Securities and Exchange Commission on or prior to April 30, 2018, and is incorporated herein by reference.

We have adopted a code of business conduct and ethics that applies to directors, officers and employees of Main Street. This code of ethics is published on our Web site at www.mainstcapital.com. We intend to disclose any substantive amendments to, or waivers from, this code of conduct within four business days of the waiver or amendment through a Web site posting.

The information required by this Item will be contained in the Proxy Statement under the headings "Compensation of Executive Officers," "Compensation of Directors," "Compensation Discussion and Analysis," "Compensation Committee Interlocks and Insider Participation" and "Compensation Committee Report," to be filed with the Securities and Exchange Commission on or prior to April 30, 2018, and is incorporated herein by reference.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

The following table provides information regarding our equity compensation plans as of December 31, 2017:

The other information required by this Item will be contained in the Proxy Statement under the heading "Security Ownership of Certain Beneficial Owners and Management," to be filed with the Securities and Exchange Commission on or prior to April 30, 2018, and is incorporated herein by reference.

Item 13. Certain Relationships and Related Transactions, and Director Independence

The information required by this Item will be contained in the Proxy Statement under the headings "Certain Relationships and Related Party Transactions" and "Corporate Governance," to be filed with the Securities and Exchange Commission on or prior to April 30, 2018, and is incorporated herein by reference.

The information required by this Item will be contained in the Proxy Statement under the heading "Ratification of Appointment of Independent Registered Public Accounting Firm for Year Ending December 31, 2018," to be filed with the Securities and Exchange Commission on or prior to April 30, 2018, and is incorporated herein by reference.

The following documents are filed or incorporated by reference as part of this Annual Report:

The following exhibits are filed as part of this report or hereby incorporated by reference to exhibits previously filed with the SEC:

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.


(Mark One)
þ		ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
		For the fiscal year ended December 31, 2017
OR
o		TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
		For the transition period from to


Maryland (State or other jurisdiction of incorporation or organization)		41-2230745 (I.R.S. Employer Identification No.)
1300 Post Oak Boulevard, 8th Floor Houston, TX (Address of principal executive offices)		77056 (Zip Code)


Large accelerated filer þ		Accelerated filer o		Non-accelerated filer o (do not check if smaller reporting company)		Smaller reporting company o Emerging growth company o

		(10.0)%			(5.0)%			0.0%			5.0%			10.0%

Corresponding net return to common stockholder(2)			(19.0)%			(10.8)%			(2.6)%			5.6%			13.8%

	Prior to Sale Below NAV		Following Sale Below NAV

*Reduction to NAV*
Total Shares Outstanding		1,000,000		1,040,000		4.0%
NAV per share	$	10.00	$	9.98		(0.2)%
*Dilution to Existing Stockholder*
Shares Held by Stockholder A		10,000		10,000	(1)	0.0%
Percentage Held by Stockholder A		1.00%		0.96%		(3.8)%
Total Interest of Stockholder A in NAV	$	100,000	$	99,808		(0.2)%

		Page

PART I
Item 1.	Business	1
Item 1A.	Risk Factors	22
Item 1B.	Unresolved Staff Comments	46
Item 2.	Properties	46
Item 3.	Legal Proceedings	46
Item 4.	Mine Safety Disclosures	46
PART II
Item 5.	Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	47
Item 6.	Selected Financial Data	53
Item 7.	Management's Discussion and Analysis of Financial Condition and Results of Operations	55
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	80
Item 8.	Consolidated Financial Statements and Supplementary Data	81
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	202
Item 9A.	Controls and Procedures	202
Item 9B.	Other Information	202
PART III
Item 10.	Directors, Executive Officers and Corporate Governance	203
Item 11.	Executive Compensation	203
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	203
Item 13.	Certain Relationships and Related Transactions, and Director Independence	204
Item 14.	Principal Accountant Fees and Services	204
PART IV
Item 15.	Exhibits and Financial Statement Schedules	205
Signatures		209

	High		Low

Fiscal year 2017
Fourth quarter	$	41.55	$	39.71
Third quarter	$	40.40	$	38.13
Second quarter	$	40.39	$	37.80
First quarter	$	38.27	$	35.39
Fiscal year 2016
Fourth quarter	$	37.36	$	32.23
Third quarter	$	34.59	$	32.61
Second quarter	$	32.90	$	30.52
First quarter	$	31.46	$	26.35

Date Declared	Amount(1)

Fiscal year 2014
Total	$	2.545	(5),(6)



Fiscal year 2013
Total	$	2.660	(6),(7)



Fiscal year 2012
Total	$	1.710	(7),(8)



Fiscal year 2011
Total	$	1.560	(8)



Fiscal year 2010
Total	$	1.500	(9)



Fiscal year 2009
Total	$	1.500	(10),(11)



Fiscal year 2008
Total	$	1.425	(11)



Fiscal year 2007
Total	$	0.330	(12)



Cumulative dividends declared or paid	$	22.530

Payment Dates

2/15/2017	59.15	%	78.09	%
From 3/15/2017 to 6/14/2017	78.09	%	78.09	%
6/26/2017	70.00	%	70.00	%
From 7/14/2017 to 8/15/2017	0.00	%	100.00	%
9/15/2017	12.23	%	58.01	%
From 10/16/2017 to 1/12/2018	70.00	%	70.00	%

	As of December 31, 2017

	LMM(a)		Middle Market		Private Loan
	(dollars in millions)
Number of portfolio companies		70		62		54
Fair value	$	948.2	$	609.3	$	467.5
Cost	$	776.5	$	629.7	$	489.2
% of portfolio at cost — debt		67.1%		97.3%		93.6%
% of portfolio at cost — equity		32.9%		2.7%		6.4%
% of debt investments at cost secured by first priority lien		98.1%		90.5%		94.5%
Weighted-average annual effective yield(b)		12.0%		9.0%		9.2%
Average EBITDA(c)	$	4.4	$	78.3	$	39.6

Cost:

First lien debt	79.0%	76.1%
Equity	15.3%	14.5%
Second lien debt	4.5%	7.7%
Equity warrants	0.7%	1.1%
Other	0.5%	0.6%

	100.0%	100.0%

Fair Value:

First lien debt	70.5%	68.7%
Equity	24.4%	22.6%
Second lien debt	4.1%	7.2%
Equity warrants	0.6%	0.9%
Other	0.4%	0.6%

	100.0%	100.0%

	As of December 31, 2017				As of December 31, 2016

Investment Rating	Investments at Fair Value		Percentage of Total Portfolio		Investments at Fair Value		Percentage of Total Portfolio
	(dollars in thousands)
1	$	276,401		29.1%	$	253,420		28.4%
2	$	251,114		26.5%		258,085		28.9%
3	$	342,881		36.2%		294,807		33.0%
4	$	65,737		6.9%		75,433		8.5%
5	$	12,063		1.3%		10,847		1.2%

Total	$	948,196		100.0%	$	892,592		100.0%

	Twelve Months Ended December 31, 2017

	LMM(a)			Middle Market			Private Loan			Other(b)			Total
	(dollars in millions)
Accounting reversals of net unrealized (appreciation) depreciation recognized in prior periods due to net realized (gains)/(income) losses recognized during the current period	$	(11.1	)	$	5.6		$	(3.1	)	$	(8.1	)	$	(16.7	)
Net change in unrealized appreciation (depreciation) relating to portfolio investments		50.6			(9.6	)		(3.1	)		21.4			59.3

Total net change in unrealized appreciation (depreciation) relating to portfolio investments	$	39.5		$	(4.0	)	$	(6.2	)	$	13.3		$	42.6



Unrealized appreciation relating to SBIC debentures(c)														6.2

Total net change in unrealized appreciation													$	48.8

	Twelve Months Ended December 31, 2016

	LMM(a)			Middle Market		Private Loan			Other(b)			Total
	(dollars in millions)
Accounting reversals of net unrealized (appreciation) depreciation recognized in prior periods due to net realized (gains)/losses recognized during period	$	(53.1	)	$	25.7	$	9.5		$	(3.5	)	$	(21.4	)
Net change in unrealized appreciation (depreciation) relating to portfolio investments		8.2			8.4		(4.0	)		0.5			13.1

Total net change in unrealized appreciation (depreciation) relating to portfolio investments	$	(44.9	)	$	34.1	$	5.5		$	(3.0	)	$	(8.3	)

Net change in unrealized appreciation relating to marketable securities													1.7
Unrealized depreciation relating to SBIC debentures(c)													(0.9	)

Total net change in unrealized appreciation (depreciation)												$	(7.5	)

Basis Point Change	Increase (Decrease) in Interest Income			(Increase) Decrease in Interest Expense			Increase (Decrease) in Net Investment Income			Increase (Decrease) in Net Investment Income per Share

	(dollars in thousands)
(50)	$	(5,679	)	$	320		$	(5,359	)	$	(0.09	)
(25)		(2,870	)		160			(2,710	)		(0.05	)
25		2,877			(160	)		2,717			0.05
50		5,753			(320	)		5,433			0.09
100		11,565			(640	)		10,925			0.19
200		23,205			(1,280	)		21,925			0.37
300		34,844			(1,920	)		32,924			0.56
400		46,483			(2,560	)		43,923			0.75

	2018		2019		2020		2021		2022		Thereafter		Total

SBIC debentures	$	—	$	20,000	$	55,000	$	40,000	$	5,000	$	175,800	$	295,800
Interest due on SBIC debentures		10,678		10,907		9,717		7,164		6,152		18,669		63,287
6.125% Notes		—		—		—		—		—		90,655		90,655
Interest due on 6.125% Notes		5,553		5,553		5,553		5,553		5,553		1,386		29,151
4.50% Notes due 2019		—		175,000		—		—		—		—		175,000
Interest due on 4.50% Notes due 2019		7,875		7,875		—		—		—		—		15,750
4.50% Notes due 2022		—		—		—		—		185,000		—		185,000
Interest due on 4.50% Notes due 2022		8,533		8,325		8,325		8,325		8,325		—		41,833
Operating Lease Obligation(1)		346		749		763		777		791		4,239		7,665

Total	$	32,985	$	228,409	$	79,358	$	61,819	$	210,821	$	290,749	$	904,141


Reports of Independent Registered Public Accounting Firm		82
Consolidated Balance Sheets as of December 31, 2017 and 2016		84
Consolidated Statements of Operations for the Years Ended December 31, 2017, 2016, and 2015		85
Consolidated Statements of Changes in Net Assets for the Years Ended December 31, 2017, 2016, and 2015		86
Consolidated Statements of Cash Flows for the Years Ended December 31, 2017, 2016, and 2015		87
Consolidated Schedules of Investments as of December 31, 2017 and 2016		88
Notes to Consolidated Financial Statements		146

Portfolio Company(1)(20)	Business Description	Type of Investment(2)(3)	Cost(4)		Fair Value(8)


Zilliant Incorporated	Price Optimization and Margin Management Solutions
		Preferred Stock (186,777 shares)		154		260
		Warrants (952,500 equivalent shares; Expiration — June 15, 2022; Strike price — $0.001 per share)		1,071		1,190

				1,225		1,450

Subtotal Non-Control/Non-Affiliate Investments (51.4% of total investments at fair value)			$	1,037,510	$	1,026,676

Total Portfolio Investments, December 31, 2016			$	1,871,883	$	1,996,906

Type of Investment	Fair Value as of December 31, 2017 (in thousands)		Valuation Technique	Significant Unobservable Inputs	Range(3)

Equity investments	$	653,008	Discounted cash flow	WACC	11.1% - 23.2%	13.7%	14.0%
			Market comparable / Enterprise Value	EBITDA multiple(1)	4.3x - 8.5x(2)	7.3x	6.0x
Debt investments	$	858,816	Discounted cash flow	Risk adjusted discount factor	6.7% - 16.1%(2)	11.2%	11.0%
				Expected principal recovery percentage	2.9% - 100.0%	99.8%	100.0%
Debt investments	$	659,481	Market approach	Third-party quote	11.0 - 106.0

Total Level 3 investments	$	2,171,305

Type of Investment	Fair Value as of December 31, 2016 (in thousands)		Valuation Technique	Significant Unobservable Inputs	Range(3)

Equity investments	$	567,003	Discounted cash flow	Weighted-average cost of capital	10.4% - 23.1%	13.0%	13.7%
			Market comparable / Enterprise Value	EBITDA multiple(1)	4.5x - 8.5x(2)	7.1x	6.0x
Debt investments	$	808,895	Discounted cash flow	Risk adjusted discount factor	7.4% - 15.9%(2)	11.8%	11.6%
				Expected principal recovery percentage	3.0% - 100.0%	99.7%	100.0%
Debt investments	$	618,928	Market approach	Third-party quote	22.5 - 108.0

Total Level 3 investments	$	1,994,826

Type of Investment	Fair Value as of December 31, 2016		Transfers Into Level 3 Hierarchy		Redemptions/ Repayments			New Investments		Net Changes from Unrealized to Realized			Net Unrealized Appreciation (Depreciation)			Other(1)			Fair Value as of December 31, 2017

Debt	$	1,427,823	$	—	$	(753,240	)	$	848,014	$	25,146		$	(19,664	)	$	(9,782	)	$	1,518,297
Equity		549,453		—		(44,773	)		74,227		(25,596	)		77,583			10,599			641,493
Equity Warrant		17,550		—		(4,697	)		331		(549	)		(303	)		(817	)		11,515

	$	1,994,826	$	—	$	(802,710	)	$	922,572	$	(999	)	$	57,616		$	—		$	2,171,305

Type of Investment	Fair Value as of December 31, 2015		Transfers Into Level 3 Hierarchy		Redemptions/ Repayments			New Investments		Net Changes from Unrealized to Realized			Net Unrealized Appreciation (Depreciation)		Other(1)			Fair Value as of December 31, 2016

Debt	$	1,265,544	$	—	$	(431,871	)	$	555,490	$	44,515		$	1,295	$	(7,150	)	$	1,427,823
Equity		519,966		—		(15,799	)		86,037		(60,544	)		12,643		7,150			549,453
Equity Warrant		10,646		—		(1,011	)		5,928		1,011			976		—			17,550

	$	1,796,156	$	—	$	(448,681	)	$	647,455	$	(15,018	)	$	14,914	$	—		$	1,994,826

Type of Instrument		Fair Value as of December 31, 2017			Valuation Technique		Significant Unobservable Inputs		Range		Weighted Average

SBIC debentures		$	48,608		Discounted cash flow		Estimated market interest rates		4.9% - 5.5%			5.1	%

Type of Instrument		Fair Value as of December 31, 2016			Valuation Technique		Significant Unobservable Inputs		Range		Weighted Average

SBIC debentures		$	74,803		Discounted cash flow		Estimated market interest rates		3.4% - 5.3%			4.2	%

Type of Instrument	Fair Value as of December 31, 2016		Repayments			Net Realized Loss		New SBIC Debentures		Net Unrealized (Appreciation) Depreciation			Fair Value as of December 31, 2017

SBIC debentures at fair value	$	74,803	$	(25,200	)	$	5,217	$	—	$	(6,212	)	$	48,608

			Fair Value Measurements

			(in thousands)
At December 31, 2017	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
LMM portfolio investments	$	948,196	$	—	$	—	$	948,196
Middle Market portfolio investments		609,256		—		—		609,256
Private Loan portfolio investments		467,475		—		—		467,475
Other Portfolio investments		104,610		—		—		104,610
External Investment Manager		41,768		—		—		41,768

Total portfolio investments		2,171,305		—		—		2,171,305
Marketable securities and idle funds investments		—		—		—		—

Total investments	$	2,171,305	$	—	$	—	$	2,171,305



SBIC debentures at fair value	$	48,608	$	—	$	—	$	48,608

			Fair Value Measurements

			(in thousands)
At December 31, 2016	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
LMM portfolio investments	$	892,592	$	—	$	2,080	$	890,512
Middle Market portfolio investments		630,578		—		—		630,578
Private Loan portfolio investments		342,867		—		—		342,867
Other Portfolio investments		100,252		—		—		100,252
External Investment Manager		30,617		—		—		30,617

Total portfolio investments		1,996,906		—		2,080		1,994,826
Marketable securities and idle funds investments		—		—		—		—

Total investments	$	1,996,906	$	—	$	2,080	$	1,994,826



SBIC debentures at fair value	$	74,803	$	—	$	—	$	74,803

Cost:

Southwest	26.1%	29.7%
Midwest	22.3%	23.0%
West	20.7%	16.1%
Northeast	15.2%	14.8%
Southeast	12.8%	13.1%
Canada	1.9%	1.7%
Other Non-United States	1.0%	1.6%

	100.0%	100.0%

Fair Value:

Southwest	26.8%	31.0%
West	23.7%	18.3%
Midwest	20.3%	21.2%
Northeast	14.6%	13.9%
Southeast	11.9%	12.7%
Canada	1.8%	1.4%
Other Non-United States	0.9%	1.5%

	100.0%	100.0%

	Years Ended December 31,

	2017			2016
Deferred tax assets:
Net operating loss carryforwards	$	28,422		$	38,880
Capital loss carryforwards		1,011			5,175
Other		893			—

Total deferred tax assets		30,326			44,055

Deferred tax liabilities:
Net unrealized appreciation of portfolio investments		(31,711	)		(21,807	)
Net basis differences in portfolio investments		(9,168	)		(13,112	)
Other		—			(11	)

Total deferred tax liabilities		(40,879	)		(34,930	)

Total deferred tax asset (liabilities), net	$	(10,553	)	$	9,125


Restricted stock authorized under the plan	3,000,000
Less net restricted stock granted during:
Year ended December 31, 2015	(900	)
Year ended December 31, 2016	(260,514	)
Year ended December 31, 2017	(223,812	)

Restricted stock available for issuance as of December 31, 2017	2,514,774


Restricted stock authorized under the plan	300,000
Less net restricted stock granted during:
Year ended December 31, 2015	(6,806	)
Year ended December 31, 2016	(6,748	)
Year ended December 31, 2017	(5,948	)

Restricted stock available for issuance as of December 31, 2017	280,498

For the Years Ended December 31,	Amount

2018		346
2019		749
2020		763
2021		777
2022		791
Thereafter		4,239

Total	$	7,665

	2017

	(dollars in thousands, except per share amounts)
	Qtr. 1		Qtr. 2		Qtr. 3		Qtr. 4
Total investment income	$	47,889	$	50,271	$	51,786	$	55,795
Net investment income	$	31,166	$	32,693	$	34,029	$	37,483
Net increase in net assets resulting from operations	$	31,450	$	42,829	$	34,899	$	61,444
Net investment income per share-basic and diluted	$	0.57	$	0.58	$	0.60	$	0.64
Net increase in net assets resulting from operations per share-basic and diluted	$	0.57	$	0.76	$	0.61	$	1.05

Company	Investment(1)	Amount of Realized Gain/(Loss)		Amount of Unrealized Gain/(Loss)			Amount of Interest, Fees or Dividends Credited to Income(2)			December 31, 2016 Fair Value			Gross Additions(3)		Gross Reductions(4)		December 31, 2017 Fair Value

Pegasus Research Group, LLC	Member Units		—		1,690			157			8,620			1,690		—		10,310

River Aggregates, LLC	Zero Coupon Secured Debt		—		—			80			627			80		—		707
	Member Units		—		10			—			4,600			10		—		4,610
	Member Units		—		50			—			2,510			49		—		2,559

SoftTouch Medical Holdings LLC	LIBOR Plus 9.00% (Floor 1.00%)		—		(15	)		748			7,140			15		15		7,140
	Member Units		—		920			969			9,170			919		—		10,089

Other
Amounts related to investments transferred to or from other 1940 Act classification during the period			—		—			(219	)		(9,919	)		—		—		—

		$	259	$	63,625		$	62,762		$	594,282		$	239,770	$	93,265	$	750,706