Pioneer Municipal High Income Fund, Inc.

Pioneer Municipal High Income Fund Inc (the Fund) is a diversified, closed-end management investment company. The investment objective of the Fund is to seek a high level of current income exempt from regular federal income taxes. The Fund may, as a secondary objective, also seek capital appreciation to the extent that it is consistent with its primary investment objective. Under normal market conditions, the Fund may invest at least 80% of its assets in debt securities and other obligations issued by or on behalf of states, territories and possessions of the United States and the District of Columbia and their political subdivisions, agencies and instrumentalities, the interest on which is exempt from regular federal income tax. It invests in various sectors, including health, development, tobacco, education, water, transportation, utilities, and power. Amundi Asset Management US, Inc. serves as the Fund’s investment adviser.