FX.co ★ U.S. 4-Week Bill Auction Yield Edges Up to 4.000%, Marking Modest Rise in Short-Term Funding Costs

The yield on the U.S. 4-week Treasury bill inched higher at the latest auction, reaching 4.000% compared with 3.980% at the previous sale, according to data updated on 15 October 2026.

The small uptick underscores a slight increase in short-term borrowing costs for the U.S. government, while still keeping front-end rates close to recent levels. The move may reflect ongoing market sensitivity to expectations for Federal Reserve policy and near-term liquidity conditions, with investors continuing to closely watch short-dated auctions as a barometer of immediate demand for safe, dollar-denominated assets.