Nuveen Select Maturities Municipal Fund (NYSE: NIM) is a closed-end fixed income mutual fund that seeks current income exempt from regular federal income tax, consistent with capital preservation, and secondarily aims to enhance portfolio value relative to the municipal bond market. The fund primarily invests at least 80% of its managed assets in investment-grade municipal securities exempt from federal income taxes, including those rated Baa/BBB or better or deemed comparable if unrated; it may allocate up to 20% to below-investment-grade municipal securities (with up to 10% below B-/B3), employs a laddered maturity approach targeting an intermediate duration profile, and utilizes inverse floating rate municipal securities (tender option bonds) for up to 10% effective leverage. Launched on September 18, 1992, and domiciled in the United States with headquarters at 333 West Wacker Drive, Chicago, Illinois, the fund is managed by Nuveen Fund Advisors, LLC and Nuveen Asset Management, LLC, subsidiaries of Nuveen Investments, Inc., and benchmarks performance against the S&P Intermediate Municipal Bond Index and S&P National Municipal Bond Index. The fund focuses on U.S. municipal securities issued by state and local governments, serving investors seeking tax-exempt income through a diversified portfolio constructed via fundamental analysis and bottom-up security selection. Recent developments at Nuveen, the fund's sponsor, include the June 2025 acquisition of Brooklyn Investment Group and its technology platform to expand direct indexing and tax-advantaged multi-asset solutions following a 2023 partnership and minority stake investment; a September 2025 majority stake acquisition in Ally Energy Solutions by Nuveen's Climate Inclusion Fund II to advance commercial and industrial energy decarbonization; and a proposed September 2025 merger plan approved by trustees to consolidate Nuveen Quality Municipal Fund (NOM), Nuveen New Jersey Quality Municipal Fund (NXJ), and Nuveen Pennsylvania Quality Municipal Income Fund (NQP) into Nuveen High Income Municipal Bond Fund (NMZ), pending shareholder approval, to enhance liquidity and scale.