iShares Treasury Floating Rate Bond ETF seeks to track the investment results of the Bloomberg U.S. Treasury Floating Rate Index is composed of U.S. Treasury floating rate bonds. The fund will invest at least 80% of its assets in the component securities of the underlying index and will invest at least 90% of its assets in U.S. Treasury securities that BFA believes will help the fund track the underlying index. The underlying index is a market capitalization-weighted index that measures the performance of floating rate public obligations of the U.S. Treasury.