Armour Residential REIT, Inc. is a U.S. mortgage REIT that invests primarily in Agency mortgage-backed securities backed by residential home loans. The company uses leverage and repurchase financing to build a securities portfolio and employs derivatives such as interest rate swaps, basis swaps, swaptions and futures to manage funding and duration risk. Its results are driven by net interest spread, prepayment behavior and changes in interest rates rather than by property ownership or rental income. Armour is externally managed by ARMOUR Capital Management LP, which runs day-to-day operations under a long-term management agreement.