Managed by Massachusetts Financial Services Company, the MFS High Income Municipal Trust operates as a closed-end mutual fund focused on fixed-income investments. Its portfolio predominantly comprises municipal bonds and general obligations issued by local entities, with holdings spanning various sectors such as multi-family housing, healthcare, retirement facilities, and investor-owned utilities. The fund's performance is benchmarked against the Barclays Municipal Bond Index. Established in the United States on February 17, 1989, it was previously known as Colonial High Income Municipal Trust.