Main Street Capital Fixed Income Presentation Deck

Investment Portfolio - By Type of Investment (¹) Other Portfolio (2) Equity, 2.6%, $111.2m Total Investment Portfolio $4.2 billion Equity, 27.8%, $1.2b Debt Investments, 69.6%, $2.9b (1) Fair value as of June 30, 2023 (2) Other portfolio investments, as described in MAIN's SEC filings Main Street Capital Corporation NYSE: MAIN MAIN ST CAPITAL CORPORATION Total Debt Investments $2.9 billion First Lien Debt, 99.2%, $2.9b Junior Debt, 0.8%, $24.3m mainstcapital.com Page 5

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