The Fund seeks to track the investment results of the ICE Short US Treasury Securities Index (the Underlying Index), which measures the performance of public obligations of the U.S. Treasury that have a remaining maturity of less than or equal to one year. Under normal circumstances, the Fund will seek to maintain a weighted average maturity of less than one year. Weighted average maturity is the U.S. dollar weighted average of the remaining term to maturity of the underlying securities in the Funds portfolio. As of February 29, 2024, there were 103 components in the Underlying Index. The Underlying Index is market value-weighted based on amounts outstanding of issuances consisting of publicly issued U.S. Treasury securities that have a remaining term to final maturity of less than or equal to one year as of the rebalance date and dollar 1 billion or more of outstanding face value, excluding amounts held by the Federal Reserve System Open Market Account. In addition, the securities in the Underlying Index must have a fixed coupon schedule and be denominated in U.S. dollars. Excluded from the Underlying Index are inflation-linked debt and zero-coupon bonds that have been stripped from coupon-paying bonds (e.g., Separate Trading of Registered Interest and Principal of Securities). However, the amounts outstanding of qualifying coupon securities in the Underlying Index are not reduced by any individual components of such securities (i.e., coupon or principal) that have been stripped after inclusion in the Underlying Index. The Underlying Index is rebalanced on the last calendar day of each month.