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). These include, but are not limited to, non-agency residential and commercial MBS, with the goal of achieving strong total returns. It also strategically seeks out securities classified as below investment grade. To build its portfolio, the fund utilizes a fundamental, bottom-up analytical approach. This rigorous process assesses the credit performance of the underlying mortgage loan portfolios, the structural characteristics of the MBS (such as payment priority, credit enhancement, and default patterns of the underlying loans), and the financial strength of the mortgage loan servicers. Its performance is benchmarked against the Barclays Capital U.S. Aggregate Bond Index. Formerly recognized as the Nuveen Mortgage Opportunity Term Fund, this fund was established on September 10, 2009, and maintains its domicile in the United States.