Main Street Capital Investor Day Presentation Deck

Diversified LMM Portfolio (as a Percentage of Cost)(¹) Invested Capital by Transaction Type LBO/MBO Acquisition 27% 6% 3% Recapitalization/ Refinancing (1) As of March 31, 2023 (2) Based upon portfolio company headquarters Main Street Capital Corporation 64% Growth Capital Invested Capital by Geography (2) NYSE: MAIN 28% 22% 26% MAIN ST CAPITAL CORPORATION 14% 10% mainstcapital.com

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