Annual report [Section 13 and 15(d), not S-K Item 405]

FINANCIAL HIGHLIGHTS

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FINANCIAL HIGHLIGHTS
12 Months Ended
Dec. 31, 2024
Investment Company [Abstract]  
FINANCIAL HIGHLIGHTS FINANCIAL HIGHLIGHTS
The following is a schedule of financial highlights of Main Street for the years ended December 31, 2024, 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016 and 2015:
Year Ended December 31,
Per Share Data: 2024 2023 2022 2021 2020
NAV as of the beginning of the period $ 29.20  $ 26.86  $ 25.29  $ 22.35  $ 23.91 
Net investment income (1) 4.09  4.14  3.29  2.65  2.10 
Net realized gain (loss) (1)(2) 0.53  (1.47) (0.07) 0.66  (1.77)
Net unrealized appreciation (depreciation) (1)(2) 1.59  2.84  0.33  1.97  (0.09)
Income tax benefit (provision) (1)(2) (0.36) (0.28) (0.31) (0.48) 0.21 
Net increase in net assets resulting from operations (1) 5.85  5.23  3.24  4.80  0.45 
Dividends paid from net investment income (4.11) (3.70) (2.95) (2.58) (2.46)
Dividends paid (4.11) (3.70) (2.95) (2.58) (2.46)
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) — 
Accretive effect of stock offerings (issuing shares above NAV per share) 0.51  0.67  1.17  0.58  0.41 
Accretive effect of DRIP issuance (issuing shares above NAV per share) 0.15  0.10  0.09  0.09  0.08 
Other (3) 0.06  0.05  0.03  0.06  (0.04)
NAV as of the end of the period $ 31.65  $ 29.20  $ 26.86  $ 25.29  $ 22.35 
Market value as of the end of the period $ 58.58  $ 43.23  $ 36.95  $ 44.86  $ 32.26 
Shares outstanding as of the end of the period 88,400,391 84,833,002 78,506,816 70,737,021 67,762,032
Year Ended December 31,
Per Share Data: 2019 2018 2017 2016 2015
NAV as of the beginning of the period $ 24.09  $ 23.53  $ 22.10  $ 21.24  $ 20.85 
Net investment income (1) 2.50  2.60  2.39  2.23  2.18 
Net realized gain (loss) (1)(2) (0.33) (0.03) 0.19  0.56  (0.43)
Net unrealized appreciation (depreciation) (1)(2) (0.09) 0.32  0.86  (0.14) 0.20 
Income tax benefit (provision) (1)(2) (0.02) (0.09) (0.43) 0.02  0.18 
Net increase in net assets resulting from operations (1) 2.06  2.80  3.01  2.67  2.13 
Dividends paid from net investment income (2.91) (2.69) (2.47) (1.99) (2.49)
Distributions from capital gains —  (0.16) (0.32) (0.74) (0.16)
Dividends paid (2.91) (2.85) (2.79) (2.73) (2.65)
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) (0.01)
Accretive effect of stock offerings (issuing shares above NAV per share) 0.55  0.47  1.07  0.76  0.74 
Accretive effect of DRIP issuance (issuing shares above NAV per share) 0.12  0.09  0.06  0.08  0.12 
Other (3) 0.01  0.06  0.09  0.09  0.06 
NAV as of the end of the period $ 23.91  $ 24.09  $ 23.53  $ 22.10  $ 21.24 
Market value as of the end of the period $ 43.11  $ 33.81  $ 39.73  $ 36.77  $ 29.08 
Shares outstanding as of the end of the period 64,252,937 61,264,861 58,660,680 54,354,857 50,413,744
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(1)Based on weighted-average number of common shares outstanding for the period.
(2)Net realized gains or losses, net unrealized appreciation or depreciation, and income tax provision or benefit can fluctuate significantly from period to period.
(3)Includes the impact of the different share amounts as a result of calculating certain per share data based on the weighted-average basic shares outstanding during the period and certain per share data based on the shares outstanding as of a period end or transaction date.
Year Ended December 31,
2024 2023 2022 2021 2020
(dollars in thousands)
NAV as of the end of the period $ 2,797,838 $ 2,477,399 $ 2,108,586 $ 1,788,846 $ 1,514,767
Average NAV $ 2,612,483 $ 2,276,932 $ 1,923,134 $ 1,626,585 $ 1,436,291
Average outstanding debt $ 2,128,092 $ 1,951,923 $ 1,882,462 $ 1,417,831 $ 1,152,108
Ratio of total expenses, including income tax expense, to average NAV (1) 8.29  % 8.08  % 8.05  % 8.56  % 4.95  %
Ratio of operating expenses to average NAV (2) 7.12  % 7.09  % 6.84  % 6.54  % 5.89  %
Ratio of operating expenses, excluding interest expense, to average NAV (2) 2.39  % 2.58  % 2.77  % 2.92  % 2.44  %
Ratio of net investment income to average NAV 13.59  % 14.89  % 12.76  % 11.23  % 9.60  %
Portfolio turnover ratio 22.33  % 19.24  % 16.79  % 29.81  % 18.00  %
Total investment return (3) 47.24  % 28.23  % (11.18) % 48.24  % (19.11) %
Total return based on change in NAV (4) 20.51  % 20.32  % 13.51  % 21.84  % 1.91  %
Year Ended December 31,
2019 2018 2017 2016 2015
(dollars in thousands)
NAV as of the end of the period $ 1,536,390 $ 1,476,049 $ 1,380,368 $ 1,201,481 $ 1,070,894
Average NAV $ 1,517,615 $ 1,441,163 $ 1,287,639 $ 1,118,567 $ 1,053,313
Average outstanding debt $ 1,055,800 $ 947,694 $ 843,993 $ 801,048 $ 759,396
Ratio of total expenses, including income tax expense, to average NAV (1) 5.75  % 5.75  % 7.37  % 5.48  % 4.63  %
Ratio of operating expenses to average NAV (2) 5.67  % 5.32  % 5.47  % 5.59  % 5.45  %
Ratio of operating expenses, excluding interest expense, to average NAV (2) 2.36  % 2.30  % 2.63  % 2.58  % 2.41  %
Ratio of net investment income to average NAV 10.37  % 10.87  % 10.51  % 10.35  % 10.15  %
Portfolio turnover ratio 18.86  % 29.13  % 38.18  % 24.63  % 25.37  %
Total investment return (3) 36.86  % (8.25) % 16.02  % 37.36  % 8.49  %
Total return based on change in NAV (4) 8.78  % 12.19  % 14.20  % 12.97  % 11.11  %
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(1)Total expenses are the sum of operating expenses and net income tax provision or benefit. Net income tax provision or benefit includes the accrual of net deferred tax provision or benefit relating to the net unrealized appreciation or 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 or benefit in calculating its total expenses even though these net deferred taxes are not currently payable or 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 of $23.1 million, $22.1 million, $13.0 million, $10.3 million, $7.4 million, $6.7 million, $6.8 million, $6.4 million, $5.1 million and $4.3 million for the years ended December 31, 2024, 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016 and 2015, respectively.
(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 based on change in NAV was calculated using the sum of ending NAV plus dividends to stockholders and other non-operating changes during the period, divided by the beginning NAV. Non-operating changes include any items that affect NAV 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.