Main Street Capital Investor Day Presentation Deck

BDCs Dividend Public for > 2 Years (3) Main Street Capital Corporation Monroe Capital Corporation New Mountain Finance Corporation Oaktree Specialty Lending Corporation OFS Capital Corporation Owl Rock Capital Corp MAIN Maintains a Significant Operating Cost Advantage (cont.) BDC Manager Costs Relative to Total Economic Benefit Generated (dollars in thousands) Pennant Park Floating Rate Capital Ltd. Pennant Park Investment Corporation Prospect Capital Corporation Portman Ridge Finance Corporation Saratoga Investment Corp. Stellus Capital Investment Corporation Solar Capital Ltd. Blackrock TCP Capital Corp. Triple Point Venture Growth BDC Corp. TPG Specialty Lending, Inc. WhiteHorse Finance, Inc. Management Structure Internal External External External External External External External External Internal External External External External External External External Net Increase in Net Assets (ie. Net Income) 899,533 56,381 519,520 $ 478,629 72,097 2,179,221 123,288 189,545 1,974,517 33,675 152,439 120,887 216,249 271,996 160,115 771,541 165,604 5 Year Total(¹)(2) NYSE: MAIN Add back: Compensation and Mgmt Fees $ 151,060 59,968 333,817 233,249 53,218 883,929 87,466 112,593 1,043,658 41,475 81,911 86,796 198,757 220,281 98,635 328,835 108,608 Gross Economic Benefit Before Management Costs $ MAIN ST 1,050,593 116,349 853,337 711,878 125,315 3,063,150 210,754 302,138 3,018,175 75,150 234,351 207,683 415,006 492,277 258,750 1,100,376 274,212 CAPITAL CORPORATION % Economic Profits Paid to Management 14.4% 51.5% 39.1% 32.8% 42.5% 28.9% 41.5% 37.3% 34.6% 55.2% 35.0% 41.8% 47.9% 44.7% 38.1% 29.9% 39.6% (1) Source: Public company filings (2) Amounts represent the total for the most recent five prior trailing twelve month periods through December 31, 2022 for each respective company; for each applicable BDC not > 5 years past IPO, the first full fiscal year-end post-IPO was used as the starting point for this analysis as follows: BCSF - 2019 and ORCC - 2020 (3) BDC Peer Group includes dividend paying BDCs that have been publicly-traded for at least two years and have total assets greater than $500 million based on individual SEC Filings as of December 31, 2022, with the exception of NEWT, which is excluded due to the non-traditional nature of their business plan and operations compared to most BDCs and their change away from BDC election Main Street Capital Corporation mainstcapital.com

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