CYS Investments, Inc., a specialty finance company, invests in residential mortgage pass-through securities in the United States. It also focuses on investing in residential mortgage-backed securities that are issued and the principal and interest of which are guaranteed by a federally chartered corporation (Agency RMBS); debt securities issued by the United States Department of Treasury or a government sponsored entity; and collateralized mortgage obligations issued by a government agency or government-sponsored entity that are collateralized by Agency RMBS. The company has elected to be taxed as a real estate investment trust. As a result, it would not be subject to corporate income tax on that portion of its net income that is distributed to shareholders. The company was formerly known as Cypress Sharpridge Investments, Inc. and changed its name to CYS Investments, Inc. in September 2011. CYS Investments, Inc. was founded in 2006 and is based in Waltham, Massachusetts.