Main Street Capital Corporation declared a supplemental cash dividend of $0.30 per share payable in June 2024. This supplemental cash dividend, which will be payable as set forth in the table below, will be paid out of Main Street's undistributed taxable income (taxable income in excess of dividends paid) as of March 31, 2024. The dividend will be payable from June 27, 2024 with record date of June21, 2024 and ex-dividend date of June 21, 2024.