Main Street Capital Corporation (MSCC) is a principal investment firm. MSCC's principal investment objective is to maximize its portfolio's total return by generating current income from the Company's debt investments and capital appreciation from its equity and equity related investments, including warrants, convertible securities and other rights to acquire equity securities in a portfolio company. It is primarily focused on providing customized debt and equity financing to lower middle market (LMM) companies and debt capital to middle market (Middle Market) companies. It invests primarily in secured debt investments, equity investments, warrants and other securities of LMM companies and in secured debt investments of Middle Market companies. Its investment portfolio includes its investments in LMM portfolio companies, investments in Middle Market portfolio companies and Other Portfolio investments, among others. MSC Adviser I, LLC is the External Investment Manager.