Main Street Capital Investor Day Presentation Deck

5 Year Strategic Overview - Shareholder Dividends Goal is to provide meaningful annual growth of MAIN's Monthly Dividends Supplemental Dividends provide the opportunity for additional shareholder returns MAIN plans to retain future realized gains for reinvestment Main Street Capital Corporation ● Long-term plan includes growth of Monthly Dividends and variable quarterly Supplemental Dividends based upon actual DNII per share ● MAIN ST ● CAPITAL CORPORATION ● Goal to provide higher growth rates for Monthly Dividends in forward five years We expect to recommend that our Board declare future Supplemental Dividends only to the extent Distributable Net Investment Income (DNII) significantly exceeds monthly dividends paid in future quarters Supplement Dividends will be variable based upon actual DNII growth and results, with goal to provide additional current return to MAIN shareholders Current performance and near-term expectations should result in meaningful recurring supplemental dividends for the next few quarters Supplemental Dividends, if any, will be at a discount to actual excess earnings (DNII in excess of monthly dividends) Any Supplement Dividends will also be in arrears on a quarterly basis, providing additional flexibility Current and long-term plan is to retain capital from realized gains on our equity investments for future reinvestment purposes (as opposed to paying these realized gains out as supplemental dividends) as another tool to maintain conservative leverage NYSE: MAIN mainstcapital.com

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