The investment seeks to track the performance of the Bloomberg Barclays US Aggregate Total Return Index. To pursue its goal, the fund normally invests substantially all, but at least 80%, of its assets in bonds comprising the Bloomberg Barclays US Aggregate Total Return Index and TBA transactions representing bonds included in the index. The Bloomberg Barclays US Aggregate Total Return Index is designed to measure the investment grade, U.S. dollar-denominated, fixed-rate taxable bond market. It is non-diversified.