Fidelity Municipal Income Fund (FHIGX) is an open-end mutual fund managed by Fidelity Investments that seeks a high level of current income exempt from federal income tax by investing primarily in investment-grade municipal securities. The fund normally invests at least 80% of its assets in municipal bonds and notes whose interest is exempt from federal income tax, including general obligation bonds, revenue bonds, and pre-refunded municipal securities; it allocates assets across various market sectors such as transportation, healthcare, education, utilities, housing, and water/sewer systems, as well as across different maturities; it may invest more than 25% of total assets in municipal securities financing similar types of projects and potentially allocate up to 20% to below-investment-grade securities or other debt obligations. Shares are offered to retail and institutional investors seeking tax-advantaged fixed income exposure in the U.S. national long-term municipal bond category. The fund, which commenced operations on December 1, 1977, is part of Fidelity Salem Street Trust and managed from Fidelity's headquarters at 245 Summer Street, Boston, Massachusetts. In recent periods, the fund has navigated municipal bond market volatility amid tariff concerns and interest rate changes, as highlighted in its Q2 2025 commentary, while maintaining its core strategy without reported mergers, acquisitions, partnerships, or significant structural changes within the last 1-2 years; portfolio management remains team-led, with key managers including Cormac Cullen overseeing related municipal strategies.