Main Street Investor Presentation

Total Portfolio by Industry (as a Percentage of Cost) (1) MAINST CAPITAL CORPORATION Machinery, 8% Aerospace & Defense, 5% ■ Professional Services, 5% Construction & Engineering, 5% ■ Media, 4% ■Diversified Telecommunication Services, 4% ■ Hotels, Restaurants & Leisure, 4% Electronic Equipment, Instruments & Components, 3% ■ Oil, Gas & Consumable Fuels, 3% Food Products, 3% ■ Diversified Financial Services, 2% Computers & Peripherals, 1% ■ Diversified Consumer Services, 1% ■Food & Staples Retailing, 1% Intemet & Catalog Retail, 1% ■Commercial Services & Supplies, 5% Energy Equipment & Services, 5% ■ Health Care Providers & Services, 5% Intemet Software & Services, 4% IT Services, 4% ■Leisure Equipment & Products, 4% ■Software, 4% ■Communications Equipment, 3% Specialty Retail, 3% Distributors, 3% ■Containers & Packaging, 2% ■Trading Companies & Distributors, 1% ■Transportation Infrastructure, 1% Chemicals, 1% Other, 5% (1) Excluding MAIN's Other Portfolio investments and the External Investment Manager, as described in MAIN's public filings, which represent approximately 5% of the total portfolio Main Street Capital Corporation NYSE: MAIN mainstcapital.com Page 20

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