Main Street Capital Investor Presentation Deck

Diversified Private Loan & Middle Market Investments (as a Percentage of Cost) Invested Capital by Transaction Type LBO/MBO 57% Acquisition 15% 5% Recapitalization/ Refinancing 23% Growth Capital Invested Capital by Geography (¹) 30% NYSE: MAIN 17% 9% MAIN ST CAPITAL CORPORATION 15% 29% (1) Based upon portfolio company headquarters and excluding any MAIN investments headquartered outside the U.S., which in aggregate represent approximately 4% of the combined Private Loan and Middle Market portfolios Main Street Capital Corporation mainstcapital.com Page 32

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