Main Street Capital Investor Presentation Deck

Private Loan & Middle Market Portfolios by Industry (as a Percentage of Cost) ■ Internet Software & Services, 13% Health Care Providers & Services, 7% ■ Leisure Equipment & Products, 5% ■ Diversified Consumer Services, 5% ■Specialty Retail, 4% ■ Energy Equipment & Services, 3% ■IT Services, 3% ■ Building Products, 3% ■ Media, 2% ■ Food & Staples Retailing, 2% ■ Pharmaceuticals, 2% ■ Textiles, Apparel & Luxury Goods, 1% Main Street Capital Corporation ■ Commercial Services & Supplies, 12% ■ Distributors, 6% ■ Construction & Engineering, 5% ■ Aerospace & Defense, 5% ■Machinery, 4% MAIN ST NYSE: MAIN CAPITAL CORPORATION ■Communications Equipment, 3% ■ Diversified Telecommunication Services, 3% ■Professional Services, 3% ■Chemicals, 2% ■ Diversified Financial Services, 2% ■ Electrical Equipment, 1% ■ Other, 4% mainstcapital.com Page 31

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