 AGNC Investment Corp. NASDAQ: AGNC is a mortgage real estate investment trust REIT, which means it buys or originates mortgages and mortgage-backed securities and earns income from the interest on the investments. AGNC, in particular, is an agency mortgage REIT, which means it invests in mortgages backed by federal government agencies. As such, there is lower credit risk compared to non-agency mortgage REITs. 