BlackRock MuniVest Fund, Inc. is a closed-ended fixed income mutual fund launched by BlackRock, Inc. It is managed by BlackRock Advisors, LLC. The fund invests in the fixed income markets of the United States. It primarily invests in investment grade, long term municipal obligations that are exempt from federal income taxes. The fund seeks to invest in securities with maturities of more than ten years. BlackRock MuniVest Fund, Inc. was formed on September 29, 1988 and is domiciled in the United States.