Main Street Investor Presentation

LMM Portfolio Attributes Reflect Investment Strategy MAINST CAPITAL CORPORATION High yielding secured debt investments coupled with significant equity participation = Attractive risk-adjusted returns Weighted-Average Effective Yield=11.6% Average Fully Diluted Equity Ownership=41% Security Position on Debt Capital as a Percentage of Cost Fully Diluted Equity Ownership% 1st Lien 98% 2nd Lien/ Other 50.0% and greater 2% 28% 34% 38% 1.0% - 24.9% 25.0% - 49.9% Main Street Capital Corporation NYSE: MAIN mainstcapital.com Page 20

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