Main Street Capital Investor Day Presentation Deck

Middle Market Returns 8.1% 5.0% FY 2017 4.6% 1.3% FY 2018 LTM Total Returns (1), (2) vs. Indices 1.2% 8.3% FY 2019 ■MAIN Middle Market 1.7% FY 2020 -0.7% 8.4% (1) Total return includes interest, fee, and dividend income plus realized and unrealized gains and losses (2) Represents Middle Market investments sourced by Main Street's Private Credit group and allocated to MAIN's investment portfolio Main Street Capital Corporation NYSE: MAIN CS Leveraged Loan Index - B Ratings 5.1% FY 2021 MAIN ST CAPITAL CORPORATION 1.2% 0.0% FY 2022 mainstcapital.com

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