Guggenheim Build America Bonds Managed Duration Trust is a closed ended fixed income mutual fund launched by Guggenheim Partners, LLC. The fund is co-managed 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. Guggenheim Build America Bonds Managed Duration Trust was formed on October 26, 2010 and is domiciled in United States.