US sells 3-month bills at a high rate of 3.75%, B/C 2.61x; sells 6-month bills at a high rate of 3.855%, B/C 2.98x

Weekly three- and six-month bill auctions are the most routine supply in the US rates calendar and rarely reprice anything on their own; their value is cumulative, as a running read on front-end demand and on where the market is clearing paper against the policy path. The high rates here sit where bills have traded under a higher-for-longer front end, and bid-to-covers in this range are typical rather than stretched; dealers and money funds absorb this supply mechanically, so the metric that matters is tail versus when-issued and any persistent slippage in indirect participation, neither of which the headline alone discloses. The spread between the two tenors embeds the market's pricing of the near-term policy path, and shifts in that slope have historically told more about rate expectations than the absolute levels do. The distinction worth drawing is between bills and coupons: bill auctions clear on collateral and cash-management demand, whereas coupon supply tests duration appetite, so softness at one does not automatically transmit to the other. Worth watching is whether successive auctions show weakening cover or consistent tails, which in past episodes has preceded cheapening of bills against OIS as issuance needs rose. As a data point this is housekeeping, not signal.