The Fund seeks to track the investment results of the ICE 0-3 Month US Treasury Securities Index, which measures the performance of public obligations of the U.S. Treasury that have a remaining maturity of less than or equal to three months. As of February 28, 2022, there were 40 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 three months as of the rebalance date and $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 securities 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.