As of March 31, 2015, SPDR Series Trust - SPDR Nuveen S&P VRDO Municipal Bond ETF has gone out of business. SPDR Series Trust - SPDR Nuveen S&P VRDO Municipal Bond ETF is an exchange traded fund launched by State Street Global Advisors, Inc. The fund is co-managed by SSgA Funds Management, Inc. and Nuveen Asset Management, LLC. It invests in the fixed-income markets of the United States. The fund invests in tax-exempt investment grade municipal variable rate demand obligations issued by U.S. states and territories or local governments or agencies that are rated A-3 or higher by S&P or Fitch and which have maturities greater than or equal to one month. It seeks to replicate the performance of the S&P National AMT-Free Municipal VRDO Index, by using representative sampling technique. The fund was formerly known as SPDR Series Trust - SPDR S&P VRDO Municipal Bond ETF. SPDR Series Trust - SPDR Nuveen S&P VRDO Municipal Bond ETF was formed on September 23, 2009 and is domiciled in the United States.