Main Street Capital Corporation to pay supplemental dividend in June

In addition to the regular monthly dividends for the third quarter of 2026, the Board of Directors declared a supplemental cash dividend of $0.30 per share payable in June 2026. 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, 2026.

Supplemental Cash Dividend Payable in June 2026
Declared	Ex-Dividend Date	Record Date	Payment Date	Amount Per Share
5/4/2026	6/22/2026	6/22/2026	6/29/2026	$0.30