MSCC(MAIN) - 2024 Q1 - Quarterly Results

Exhibit 99.1 NEWS RELEASE Contacts: Main Street Capital Corporation Dwayne L. Hyzak, CEO, dhyzak@mainstcapital.com Jesse E. Morris, CFO and COO, jmorris@mainstcapital.com 713-350-6000 • Net investment income of $89.8 million (or $1.05 per share) • Distributable net investment income of $94.4 million (or $1.11 per share) (1) • Total investment income of $131.6 million • An industry leading position in cost efficiency, with a ratio of total non-interest operating expenses as a percentage of quarterly average ...