BlackRock MuniAssets Fund, Inc. is a fixed income mutual fund launched by BlackRock, Inc. and managed by BlackRock Advisors, LLC that invests in fixed income markets. The fund aims to provide current income exempt from federal income taxes by investing in a portfolio of medium-to-lower grade or unrated municipal obligations. It was formerly known as MuniAssets Fund, Inc. and was formed on June 25, 1993 in the United States.