Apollo Investment Corporation is business development company and operates as a closed-end management investment company. The company invests in middle market companies. It provides direct equity capital, mezzanine and senior secured loans, and subordinated debt and loans. It also seeks to invest in PIPES transactions. The company may also invest in public companies that are thinly traded and may acquire investments in the secondary market. It prefers to invest in warrants, makes equity co-investments, and may also invest in cash equivalents, U.S. government securities, high-quality debt investments that mature in one year or less, high-yield bonds, distressed debt, non-U.S. investments, or securities of public companies that are not thinly traded. The company typically invests in building materials, business services, cable television, chemicals, consumer products, direct marketing, distribution, energy and utilities, financial services, healthcare, manufacturing, media, publishing, retail and transportation. It primarily invests between $20 million and $250 million in its portfolio companies. The company seeks to make investments with stated maturities of five to ten years.