Apollo Residential Mortgage, Inc. is a holding company, which conducts its business primarily through ARM Operating, LLC and its other operating subsidiaries. The Company is a residential real estate finance company that invests in residential mortgage assets in the United States. The Company invests in residential mortgage-backed securities (RMBS) that are issued or guaranteed as to principal and/or interest by a federally chartered corporation, such as Fannie Mae (Freddie Mac), or an agency of us the United Sates Government, such as Ginnie Mae (collectively, the Agencies, with RMBS being issued or guaranteed by the Agencies being referred to as Agency RMBS), whose underlying collateral includes fixed rate mortgages, adjustable rate mortgages (ARMs) and interest-only and inverse interest-only securities (collectively, Agency Derivatives). The Company also invests in RMBS that are not issued or guaranteed by the United Sates government Agency (non-Agency RMBS).