Main Street Capital Announces Increase in Monthly Dividends to $0.135

Main Street Capital Corporation

announced today that its Board of Directors declared monthly dividends of $0.135 per share for each of October, November and December 2011. These monthly dividends, which will be payable pursuant to the table below, equal a total of $0.405 per share for the fourth quarter of 2011. The fourth quarter 2011 dividends represent an 8.0% increase from the dividends declared for the fourth quarter of 2010 and a 3.8% increase compared to the third quarter of 2011. The dividends per share for the fourth quarter of 2011 equate to an approximate annualized yield of 9.0% based on Main Street's current share price. Including the dividends declared for the fourth quarter of 2011, Main Street will have paid $6.32 per share in cumulative dividends since its October 2007 initial public offering.