BlackRock Taxable Municipal Bond Trust is a closedended 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 taxable municipal securities which include Build America Bonds The fund also invests in taxexempt securities US treasury securities obligations of the US government its agencies and instrumentalities and corporate bonds It was formerly known as BlackRock Build America Bond Trust BlackRock Taxable Municipal Bond Trust was formed on August 27 2010 and is domiciled in the United States