Apollo Investment Corp. is a business development company that invests in middle market companies with revenues of $50 million - $2 billion located in the US. Sectors of interest include aviation, building materials, business services, cable television, chemicals, consumer products, direct marketing, distribution, energy or utilities, financial services, healthcare, manufacturing, media , oil & gas, publishing, retail, and transportation. The fund provides financing primarily in various forms of debt including secured, unsecured and mezzanine debt and to a lesser extent, equity with an investment size ranging from $20 to $250 million. It also makes investments in public companies.