Main Street Investor Presentation

MAINST MAIN Co-Founders and Executive Management Team Dwayne Hyzak; CPA CEO David Magdol President and CIO Vince Foster; CPA & JD Executive Chairman Jesse Morris; CPA COO and Executive Vice President Brent Smith; CPA CFO and Treasurer Jason Beauvais; JD SVP, GC, CCO) and Secretary CAPITAL CORPORATION Co-founded MAIN; Joined Main Street group in 2002; affiliated with Main Street group since 1999 Director of acquisitions/integration with Quanta Services (NYSE: PWR) Manager with a Big 5 Accounting Firm's audit and transaction services groups Co-founded MAIN; Joined Main Street group in 2002 Vice President in Lazard Freres Investment Banking Division Vice President of McMullen Group (John J. McMullen's Family Office) • Co-founded MAIN and MAIN predecessor funds (1997) " • Co-founded Quanta Services (NYSE: PWR) Partner in charge of a Big 5 Accounting Firm's Corporate Finance/Mergers and Acquisitions practice for the Southwest United States • Joined MAIN in 2019 Previously Executive Vice President with Quanta Services (NYSE: PWR) Prior experience with a Big 5 Accounting Firm and a publicly-traded foodservice distribution company • Joined MAIN in 2014 Previously CFO with a publicly-traded oilfield services company Prior experience with a Big 5 Accounting Firm and a publicly-traded financial consulting firm ■ Joined MAIN in 2008 Previously attorney for Occidental Petroleum Corporation (NYSE: OXY) and associate in the corporate and securities section at Baker Botts LLP (1) Member of MAIN Executive Committee (2) Member of MAIN Investment Committee (3) Chief Investment Officer (4) Chief Operating Officer (5) Chief Compliance Officer Main Street Capital Corporation NYSE: MAIN mainstcapital.com Page 16

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