Apollo Investment Corporation functions as an externally managed, non-diversified, closed-end investment firm, designated as a business development company (BDC) under the Investment Company Act of 1940. The firm specializes in private equity opportunities, targeting leveraged buyouts, corporate acquisitions, recapitalizations, growth capital, refinancing, and privately-held middle-market enterprises. Its financing solutions are comprehensive, encompassing direct equity, mezzanine capital, various secured loan structures (such as first lien, stretch senior, unitranche, second lien, and senior secured), along with unsecured and subordinated debt.