Main Street Investor Presentation

Monthly Dividends Per Share - Sustainable Growth Recurring monthly dividend has never been decreased and has shown meaningful (86%) growth since IPO Based upon the current annualized monthly Trailing Twelve Months Monthly Dividends Per Share $2.50 $2.25 MAINST CAPITAL CORPORATION dividends for the fourth $2.00 quarter of 2020, the annual effective yield on MAIN'S $1.75 stock is 7.9% (1) MAIN has also paid $4.040 in supplemental dividends $1.50 Cumulative dividends paid or declared, including supplemental dividends, from October 2007 IPO (at $15.00 per share) through Q4 2020 equal $29.600 per share(2) $1.25 $1.00 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Monthly Dividends (2) (1) As of August 5, 2020; based upon the closing market price of $31.05 per share and the annualized most recently declared monthly dividends (2) Based upon dividends which have been paid or declared as of August 5, 2020 Main Street Capital Corporation NYSE: MAIN mainstcapital.com Page 17

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