Main Street Investor Presentation

MAIN Corporate Structure - Internally Managed "Internally managed" structure means no external management fees or expenses are paid, providing operating leverage to MAIN'S business; MAIN targets total operating and administrative costs at or less than 2% of assets Main Street Capital Corporation (BDC/RIC) Assets: $1,969 million Line of Credit: $315 million ($740.0 million facility)(¹) Notes: $510 million(2) MAINST CAPITAL CORPORATION Main Street Mezzanine Fund, LP (2002 vintage SBIC) Assets: SBIC Debt: Main Street Capital II, LP (2006 vintage SBIC) $214 million $140 million outstanding Assets: $82 million Main Street Capital III, LP (2016 vintage SBIC) Assets: $281 million SBIC Debt: $175 million outstanding (1) As of June 30, 2020, MAIN's credit facility had $740.0 million in total commitments. MAIN's credit facility includes an accordion feature which could increase total commitments up to $800.0 million (2) $325.0 million of 5.20% Notes due May 2024 and $185.0 million of 4.50% Notes due December 2022. In July 2020, MAIN issued an additional $125.0 million aggregate principal amount of the 5.20% Notes, resulting in an outstanding principal balance of $450.0 million for the 5.20% Notes. Main Street Capital Corporation NYSE: MAIN mainstcapital.com Page 15

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