The investment seeks to provide investment results that closely correspond, before fees and expenses, to the performance of the FTSE Goldman Sachs US Broad Bond Market Index. The fund seeks to achieve its investment objective by investing at least 80% of its assets (exclusive of collateral held from securities lending) in securities included in its underlying index. The index is a rules-based index that is designed to measure the performance of investment grade, U.S. dollar (?USD?)-denominated bonds issued in the United States that meet certain liquidity and fundamental screening criteria.