Fund Description: The SPDR Nuveen Bloomberg Barclays High Yield Municipal Bond ETF , formerly SPDR Nuveen S&P High Yield Municipal Bond ETF is an exchange-traded index fund or Index ETF that is a separate investment portfolio of the SPDR Series Trust, an open-end management investment company. INVESTMENT OBJECTIVE: The SPDR Nuveen Bloomberg Barclays High Yield Municipal Bond ETF seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of the Bloomberg Barclays Municipal Yield Index and to provide income that is exempt from federal income taxes, formerly S&P Municipal Yield Index. INDEX DESCRIPTION: The Bloomberg Barclays Municipal Yield Index is market value-weighted and designed to measure the performance of U.S. dollar-denominated high-yield municipal bonds issued by U.S. states, the District of Columbia, U.S. territories and local governments or agencies. The Index includes fully tax-exempt investment grade, non-investment grade (junk) and non-rated bonds. The Index consists of bonds that are constituents of the Bloomberg Barclays Municipal High Yield Bond Index and Bloomberg Barclays U.S. Municipal Bond Index as follows: (i) 70% of the Index is represented by the constituents of the Bloomberg Barclays Municipal High Yield Bond Index, the constituents of which are non-rated or rated no higher than Ba1 or BB+ by Standard & Poor's or Fitch Inc. (ii) 20% of the Index is represented by the constituents of the Bloomberg Barclays U.S. Municipal Bond Index that are rated Baa3, Baa2, or Baa1 by Moody's or BBB-, BBB, or BBB+ by S&P or Fitch; and (iii) 10% of the Index is represented by the constituents of the Bloomberg Barclays U.S. Municipal Bond Index that are rated A3, A2, or A1 by Moody's or A-, A, or A+ by S&P or Fitch. FUND STRATEGY: In seeking to track the performance of the Index the Fund employs a sampling strategy, which means that the Fund is not required to purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The quantity of holdings in the Fund will be based on a number of factors, including asset size of the Fund. It is generally expected that the Fund will hold less than the total number of securities in the Index, but reserves the right to hold as many securities as it believes necessary to achieve the Fund’s investment objective. Under normal market conditions, the Fund generally invests substantially all, but at least 80%, of its total assets in the securities comprising the Index or in securities that have been determined to have economic characteristics that are substantially identical to the economic characteristics of the securities that comprise the Index. Additionally, the Fund intends to invest, under normal circumstances, at least 80% of its net assets in investments the income of which is exempt from regular federal income tax. In addition, the Fund may invest in debt securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds. FUND MANAGEMENT: SSgA Funds Management, Inc. serves as the investment adviser to the Fund.