FX.co ★ U.S. 4-Week T‑Bill Auction Yield Edges Up to 3.620%

The yield on the latest U.S. 4-week Treasury bill auction inched higher, with the rate settling at 3.620%, up slightly from the previous 3.615%. The updated figure, as of 26 March 2026, signals a marginal uptick in very short-term government borrowing costs.

While the move is minimal in absolute terms, slight changes in the 4-week bill yield are closely watched by money market participants and short-term investors, as they can reflect subtle shifts in expectations for Federal Reserve policy and immediate liquidity conditions. The near-stable outcome suggests that market sentiment around the ultra-short end of the curve remains steady, with only a modest repricing of short-term rates since the prior auction.