Guggenheim Taxable Municipal Bond Investment Grade Debt Trust is a closed ended fixed income mutual fund launched by Guggenheim Partners LLC The fund is comanaged by Guggenheim Funds Investment Advisors LLC and Guggenheim Partners Investment Management LLC It invests in fixed income markets of the United States The fund primarily invests in a diversified portfolio of taxable municipal securities known as Build America Bonds It was formerly known as Guggenheim Taxable Municipal Managed Duration Trust Guggenheim Taxable Municipal Bond Investment Grade Debt Trust was formed on October 26 2010 and is domiciled in United States