The Bloomberg Barclays U.S. Aggregate Bond Index measures the performance of Investment Grade securities and is selected by a Market Value process. Currently, 4 ETFs track the Bloomberg Barclays U.S. Aggregate Bond Index with more than $58.65 B in ETP assets with an average expense ratio of 0.16%. The largest ETF is iShares Core U.S. Aggregate Bond ETF (AGG) by iShares with $52.37 B in assets.