The objective of the SPDR Barclays US Aggregate Bond UCITS ETF is to track the performance of the investment grade, US dollardenominated, fixed-rate taxable bond market. It aims to do this by tracking the Barclays US Aggregate Index as closely as possible. The Barclays US Aggregate Bond Index is a broad-based benchmark that measures the investment grade, US dollar-denominated, fixed-rate taxable bond market. This includes Treasuries, government-related and corporate securities, mortgage-backed securities, asset-backed securities and collateralised mortgagebacked securities.