The Nuveen Mortgage and Income Fund functions as a closed-end mutual fund concentrating on fixed-income assets, originally founded by Nuveen Investments, Inc. Its oversight is a collaborative effort between Nuveen Fund Advisors LLC, Nuveen Asset Management, LLC, and Wellington Management Company LLP. The fund directs its investments towards the United States' fixed income markets, primarily targeting undervalued mortgage-backed securities (MBS).