FX.co ★ U.S. 4-Week Bill Auction Yield Edges Up to 3.63% on May 28, 2026

The yield on the U.S. 4-week Treasury bill inched higher at the latest auction, with the rate settling at 3.630%, up from the previous 3.610%. The updated figure, released on May 28, 2026, signals a modest uptick in short-term funding costs for the U.S. government.

While the move is small, the gradual rise from the prior auction highlights ongoing sensitivity in the very short end of the yield curve, an area closely watched by money market participants and liquidity-focused investors. With the 4-week bill serving as a key reference for cash management and short-term investment strategies, even slight shifts in the auction stop rate can influence demand dynamics and portfolio positioning in Treasury markets.