Main Street Capital Investor Day Presentation Deck

Non-Listed BDC Performance - 5 Year NM ADS NM HPSCL NM ORIC 5 Year Ending March 31, 2023 - Annualized Return (¹) NM BSPC NM ORTI NM 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 6.49% MSIF NYSE: MAIN 7.34% ORCC II FS E&P -6.50% 4.98% FBSP MAIN ST CAPITAL CORPORATION NexPoint PF R&A -4.88% -6.61% mainstcapital.com

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