Main Street Investor Presentation

MAINST CAPITAL CORPORATION Private Loan Investment Strategy Private Loan portfolio investments are primarily debt investments in privately held companies which have been originated through strategic relationships with other investment funds on a collaborative basis, and are often referred to in the debt markets as "club deals" Investment Objectives Access proprietary investments with attractive risk-adjusted return characteristics ⚫ Generate cash yield to support MAIN monthly dividend Investment Characteristics • Investments in companies that are consistent with the size of companies in our LMM and Middle Market portfolios Proprietary investments originated through strategic relationships with other investment funds on a collaborative basis • Current Private Loan portfolio companies have weighted-average EBITDA of approximately $51.8 million(1) Investments in secured debt investments First lien, senior secured debt investments Floating rate debt investments 8% -12% targeted gross yields • Weighted-average effective yield (2) of 8.7% (3) Net returns positively impacted by lower overhead requirements and modest use of leverage Floating rate debt investments provide matching with MAIN's floating rate credit facility (1) This calculation excludes four Private Loan portfolio companies as EBITDA is not a meaningful metric for these portfolio companies (2) Weighted-average effective yield includes amortization of deferred debt origination fees and accretion of original issue discount, but excludes fees payable upon repayment of the debt instruments and any debt investments on non-accrual status (3) Weighted-average effective yield is calculated using the applicable floating interest rate as of June 30, 2020 Main Street Capital Corporation NYSE: MAIN mainstcapital.com Page 11

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