The investment seeks to track as closely as possible, before fees and expenses, the total return of the Bloomberg Barclays US Aggregate Bond Index. The fund will invest at least 90% of its net assets in securities included in the index. The index is a broad-based benchmark measuring the performance of the U.S. investment grade, taxable bond market, including U.S. Treasuries, government-related and corporate bonds, mortgage pass-through securities, commercial mortgage-backed securities, and asset-backed securities that are publicly available for sale in the United States.