Main Street Capital Corporation Series A Senior Notes Offering

Main Street Capital Corporation entered into a Master Note Purchase Agreement on April 8, 2026, for the issuance of $150,000,000 in aggregate principal amount of 6.93% Series A Senior Notes due April 15, 2031. These notes bear a fixed interest rate of 6.93% per year and mature on April 15, 2031. Interest is payable semiannually. The notes are redeemable at Main Street's option under certain conditions, and mandatory prepayment is required upon specific change in control events. The proceeds will be used for repaying outstanding indebtedness, making investments, purchasing marketable securities, and for general corporate purposes. The agreement includes customary covenants and events of default. The notes were offered in reliance on Section 4(a)(2) of the Securities Act of 1933, meaning they are not registered with the SEC.