SPDR SERIES TRUST PORTFOLIO AGGREGATE BOND ETF

The SPDR® Bloomberg Barclays Aggregate Bond ETF seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of the Bloomberg Barclays U.S. Aggregate Index. The Bloomberg Barclays U.S. Aggregate Index provides a measure of the performance of the U.S. dollar denominated investment grade bond market, which includes investment grade (must be Baa3/BBB- or higher using the middle rating of Moody's Investor Service, Inc., Standard & Poor's, and Fitch Inc.) government bonds, investment grade corporate bonds, mortgage pass through securities, commercial mortgage backed securities and asset backed securities that are publicly for sale in the United States. The securities in the U.S.