The investment seeks to track the investment results of the Bloomberg Barclays U.S. Universal 1-5 Year Index, which measures the performance of U.S. dollar-denominated taxable bonds that are rated either investment-grade or high yield with remaining effective maturities between one and five years. The fund invests at least 90% of its assets in the component securities of the index and in investments that have economic characteristics that are substantially identical to the component securities and may invest up to 10% of its assets in certain futures, options and swap contracts, cash and cash equivalents, as well as in securities not included in the index.