US Treasury auction sees largest yield tail since May amid weak foreign demand

The U.S. Treasury auction recorded its largest yield tail since May, signaling weak foreign demand for government debt. The tail—the gap between the auction's awarded yield and pre-auction market levels—widened as overseas buyers pulled back, a development that may reflect broader concerns about U.S. debt sustainability. The weak showing matters because Treasury yields anchor borrowing costs across markets, including crypto, where risk assets often react to shifts in dollar liquidity and rate expectations. Watch upcoming auctions and foreign participation data for confirmation of whether this is a one-off soft patch or the start of a sustained demand problem.