Main Street Capital Investor Day Presentation Deck

LMM Portfolio by Industry (as a Percentage of Cost)(¹) ■ 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% (1) As of March 31, 2023 Main Street Capital Corporation Professional Services, 7% ■Tobacco, 7% ■ Computers & Peripherals, 5% ■IT Services, 4% ■Leisure Equipment & Products, 4% ■ Software, 4% ■ Energy Equipment & Services, 3% ■Internet Software & Services, 3% Food Products, 3% ■ Internet & Catalog Retail, 2% ■Health Care Equipment & Supplies, 2% ■Household Durables, 1% Building Products, 1% NYSE: MAIN MAINST CAPITAL CORPORATION mainstcapital.com

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