Main Street Capital Investor Day Presentation Deck

Non-Listed BDC Performance - 3 Year NM ADS NM HPSCL NM ORIC 3 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 6.51% MSIF NYSE: MAIN 10.35% ORCC II FS E&P -9.29% 5.44% MAIN ST CAPITAL CORPORATION 10.01% 5.39% FBSP NexPoint PF R&A mainstcapital.com

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