MFS High Income Municipal Trust operates as a diversified, closed-end management investment company. The trust principally invests in municipal bonds and local general obligations. Its portfolio includes investments in various sectors, such as multifamily, hospitals, care retirement, and investor-owned utilities. Columbia Management Advisors, Inc. manages the operations of the trust. The trust was formerly known as Colonial High Income Municipal Trust and changed its name to MFS High Income Municipal Trust in 2007. MFS High Income Municipal Trust was founded in 1989 and is based in Boston, Massachusetts.