CYS Investments, Inc. is a specialty finance company. The Company invests in agency residential mortgage-backed security (Agency RMBS) collateralized by fixed rate single-family residential mortgage loans; adjustable-rate mortgages (ARMs), which have coupon rates that reset monthly, or hybrid ARMs, which have a coupon rate that is fixed for an initial period (approximately three, five, seven or 10 years). In addition, the Company permits investments in collateralized mortgage obligations (CMOs) issued by a Government agency or Government-sponsored entity that are collateralized by Agency RMBS, although it has not invested in any CMOs. In addition to Agency RMBS, the Company invests in the United States Treasuries. The Company also invests in debt securities issued by the United States Department of the Treasury or a Government-sponsored entity that is not backed by collateral.