Main Street Capital Corporation Declares Regular Monthly Cash Dividends for Each of April, May and June 2024, Payable from April 15, 2024, May 15, 2024 and June 14, 2024, Respectively

Main Street Capital Corporation is a principal investment company primarily focused on providing customized debt and equity financing to lower middle market (LMM) companies and debt capital to middle market (Middle Market) companies. Its portfolio investments are typically made to support management buyouts, recapitalizations, growth financings, refinancings and acquisitions of companies that operate in a variety of industry sectors. The Company invests primarily in secured debt investments, equity investments, warrants and other securities of LMM companies based in the United States and in secured debt investments of Middle Market companies generally headquartered in the United States. It owns several investment funds, including Main Street Mezzanine Fund, LP and Main Street Capital III, LP, (collectively the Funds), and each of their general partners. The Funds are each licensed as a Small Business Investment Company (SBIC) by the United States Small Business Administration (SBA).