Main Street Capital Corporation is an internally managed business development company that provides customized long-term debt and equity financing solutions to lower middle-market companies with annual revenues between $10 million and $150 million, as well as debt capital to private companies owned by or acquired by private equity funds. The company generates revenue through interest income on secured first-lien loans (typically yielding 10–14% annually), equity appreciation from warrant exercises and direct equity sales, and management and incentive fees from its external investment manager affiliate that advises third-party funds. The company differentiates itself through its focused strategy on the underserved lower middle market, experienced in-house management team, responsive decision-making, and ability to provide integrated "one-stop" financing solutions combining senior debt, subordinated debt, equity, and warrants in single transactions.