Main Street Capital Investor Presentation Deck

Executive Summary Unique focus on under-served Lower Middle Market Inefficient asset class with less competition Unique market opportunity with attractive risk-adjusted returns Generally first lien, senior secured debt investments plus meaningful equity participation ● ● ● ● Invest in complementary interest-bearing Private Loan and Middle Market debt investments • Lower risk / more liquid asset class Opportunity for consistent investment activity Generally first lien, senior secured debt investments Growing Asset Management Business drives additional investment income Efficient internally managed operating structure drives greater shareholder returns Alignment of interests between management and our shareholders Maintains an industry leading operating cost structure Favorable operating cost comparison to other yield oriented investment options ● ● ● ● Attractive, recurring monthly dividend yield and historical net asset value per share growth Periodic increases in monthly dividends Increase in net asset value per share creates opportunity for stock price appreciation Additional dividend income through periodic supplemental dividends Strong liquidity and stable capitalization for sustainable growth Highly invested management team with successful track record Niche investment strategy with lower correlation to broader debt / equity markets Main Street Capital Corporation ● MAIN ST ● CAPITAL CORPORATION NYSE: MAIN mainstcapital.com Page 47

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