The Fund seeks to track the investment results of the Bloomberg U.S. Universal 10+ Year Index (the Underlying Index), which measures the performance of U.S. dollar-denominated taxable bonds that are rated either investment-grade or high yield (as determined by Bloomberg Index Services Limited (the Index Provider or Bloomberg)) with remaining maturities greater than ten years. The Underlying Index includes U.S. Treasury bonds, government-related bonds (i.e., U.S. and non-U.S. agencies, sovereign, quasi-sovereign, supranational and local authority debt), investment-grade and high yield U.S. corporate bonds, Eurodollar bonds (i.e., U.S. dollar-denominated bonds issued by foreign issuers outside the U.S.), bonds registered with the SEC or exempt from registration at the time of issuance, or offered pursuant to Rule 144A under the Securities Act of 1933, as amended (the 1933 Act) with or without registration rights (Rule 144A Bonds) and emerging market bonds.