Main Street Capital Investor Presentation Deck

Total Portfolio by Industry (as a Percentage of Cost)(1) ■ Internet Software & Services, 8% Commercial Services & Supplies, 7% ■ Distributors, 5% ■ Professional Services, 5% ■Leisure Equipment & Products, 5% ■Specialty Retail, 3% ■ Tobacco, 3% ■ Media, 2% ■ Computers & Peripherals, 2% ■ Software, 2% ■ Communications Equipment, 2% ■Auto Components, 2% ■ Electronic Equipment, Instruments & Components, 2% ■Health Care Equipment & Supplies, 1% ■Chemicals, 1% ■Hotels, Restaurants & Leisure, 1% Machinery, 7% Construction & Engineering, 6% ■Health Care Providers & Services, 5% ■Diversified Consumer Services, 5% ■IT Services, 4% ■ Energy Equipment & Services, 3% ■Containers & Packaging, 3% ■Aerospace & Defense, 2% Building Products, 2% ■Textiles, Apparel & Luxury Goods, 2% ■ Diversified Telecommunication Services, 2% ■Food Products, 2% ■Diversified Financial Services, 1% ■Intemet & Catalog Retail, 1% ■Food & Staples Retailing, 1% ■Other, 3% MAIN ST NYSE: MAIN CAPITAL CORPORATION (1) Excluding MAIN's Other Portfolio investments, the External Investment Manager and short-term portfolio investments, each as described in MAIN's filings with the SEC, which in aggregate represent approximately 4% of the total portfolio Main Street Capital Corporation mainstcapital.com Page 21

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