Main Street Investor Presentation

MAINST CAPITAL CORPORATION MAIN Regulatory Framework Highly regulated structure provides significant advantages and protections to our shareholders, including investment transparency, tax efficiency and beneficial leverage Operates as a Business Development Company Regulated by Securities and Exchange Commission - 1940 Act Publicly-traded, private investment company Regulated Investment Company (RIC) tax structure Eliminates corporate level income tax " • . Efficient tax structure providing high yield to investors Passes through capital gains to investors Small Business Investment Company (SBIC) subsidiaries Regulated by the U.S. Small Business Administration (SBA) Access to low cost, fixed rate, long-term leverage • Total SBIC debenture regulatory financing capacity of $350.0 million • " Total outstanding leverage of $314.8 million through two wholly owned SBIC Funds MAIN is a previous SBIC of the Year Award recipient Main Street Capital Corporation NYSE: MAIN mainstcapital.com Page 14

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