Main Street Capital Investor Day Presentation Deck

Non-Listed BDC Performance - 1 Year 4.17% ADS 6.09% HPSCL 8.63% ORIC 1 Year Ending March 31, 2023 - Annualized Return (¹) NM BSPC NM ORTI 5.32% BRPC NM OSC Source: The IPA / Stanger Monitor Report - as of March 31, 2023 (1) Calculated as: (Ending NAV + Cash Distributions) / (Beginning NAV) - compounded quarterly (2) NM Not in existence for full period Main Street Capital Corporation 7.72% MSIF NYSE: MAIN 8.00% ORCC II 11.22% FS E&P 5.33% FBSP MAIN ST CAPITAL CORPORATION NexPoint PF R&A -9.08% -17.78% mainstcapital.com

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