Main Street Announces Follow-On Investments

Invests an Additional $21.1 Million in Three Existing Lower Middle Market Portfolio Companies

HOUSTON, March 3, 2026 /PRNewswire/ — Main Street Capital Corporation (NYSE: MAIN) („Main Street“) is pleased to announce that it recently completed follow-on investments in three existing lower middle market portfolio companies, Nello Industries Investco, LLC („NELLO“), RFG AcquireCo, LLC („Revolution“) and Gamber-Johnson Holdings, LLC („Gamber-Johnson“), to support strategic acquisitions.

NELLO is a manufacturer of engineered steel poles and structures for the electric utility and wireless telecommunications end markets, with products including tapered steel poles, transmission poles, lattice towers and guyed towers. Founded in 2002 and headquartered in South Bend, Indiana, NELLO’s customer base consists of top EPC companies and leading electric utility and telecommunications companies. Main Street originally invested in NELLO in June 2024, partnering with the company’s existing equity owners and management team to facilitate a management led buyout. This follow-on investment was made to support a strategic acquisition that broadens the company’s ability to manufacture products for the electric utility substation and commercial markets. Main Street made the follow-on investment alongside its co-investor, MSC Income Fund, Inc. (NYSE: MSIF) („MSIF“), with Main Street’s investment consisting of an additional $9.2 million first lien, senior secured term loan and representing its fourth follow-on investment in NELLO since the initial partnership in 2024.