Main Street Capital Investor Presentation Deck

LMM Portfolio by Industry (as a Percentage of Cost) ■Machinery, 11% Construction & Engineering, 7% ■Containers & Packaging, 5% Diversified Consumer Services, 4% ■ Distributors, 4% ■Auto Components, 4% Electronic Equipment, Instruments & Components, 3% Textiles, Apparel & Luxury Goods, 3% ■Specialty Retail, 3% ■Health Care Providers & Services, 2% ■ Media, 2% Hotels, Restaurants & Leisure, 2% ■Household Products, 1% ■ Other, 3% Main Street Capital Corporation ■ Professional Services, 7% ■ Tobacco, 7% ■ Computers & Peripherals, 5% ■IT Services, 4% ■ Leisure Equipment & Products, 4% ■ Software, 4% ■Household Durables, 1% ■ Building Products, 1% MAIN ST ■ Energy Equipment & Services, 3% ■Internet Software & Services, 3% ■Food Products, 3% ■ Internet & Catalog Retail, 2% ■Health Care Equipment & Supplies, 2% NYSE: MAIN CAPITAL CORPORATION mainstcapital.com Page 25

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