BlackRock MuniVest Fund, Inc. is a closed ended fixed income mutual fund launched by BlackRock, Inc. It is co-managed by BlackRock Advisors, LLC and BlackRock Investment Management LLC. The fund invests in fixed income markets. It invests in a portfolio of long-term, investment grade municipal obligations. BlackRock MuniVest Fund, Inc. was formed in 1988 and is domiciled in United States.