US sells 30-year bonds; tail 0.4bps

• Tail: 0.4bps (prev. -0.3bps, six-auction average -0.2bps)
• High Yield: 5.216% (prev. 5.058%, six-auction average 4.937%); WI: 5.212%.
• B/C: 2.39x (prev. 2.44x, six-auction average 2.43x)
• Dealer: 11.6% (prev. 10.1%, six-auction average 10.6%)
• Direct: 21.6% (prev. 12.2%, six-auction average 22.5%)
• Indirect: 66.8% (prev. 77.7%, six-auction average 67.0%)

A 0.4bp tail at the long bond sits in the grey zone: worse than the recent stop-through run but small enough that past episodes of this size have faded from the curve within the session rather than setting a trend. The composition matters more than the headline tail. Indirects came in well below the prior auction and only around the recent average, which is the softer read, while the elevated direct takedown flatters the domestic demand line; dealers were left with slightly more than usual but not a bailout. Historically, weak long-end auctions driven by indirect softness have tended to pressure the belly-to-long-end spread and steepen the curve into the following sessions, particularly when the concession was already cheap going in, as the high yield stepping up against prior averages suggests here. The distinction worth drawing is between a one-off concession-clearing tail and the start of a sponsorship problem at the long end, which only shows up across a sequence of auctions. The follow-ons are the post-auction performance of the 30-year sector into the close, dealer positioning into the next refunding cycle, and whether the subsequent coupon supply repeats the pattern.