US sells USD 8bln of 30-year TIPS; stop-through 1.8bps

• Tail: -1.8bps (prev. -1.7bps, six-auction average 0.3bps)
• High Yield: 2.973% (prev. 2.473%, six-auction average 2.292%); WI: 2.991%.
• B/C: 2.82x (prev. 2.75x, six-auction average 2.58x)
• Dealer: 2.2% (prev. 2.5%, six-auction average 5.7%)
• Direct: 13.4% (prev. 19.2%, six-auction average 18.7%)
• Indirect: 84.4% (prev. 78.3%, six-auction average 75.6%)

A stop-through on a 30-year TIPS sale, particularly with a tail of this size relative to its recent average, is a clean-demand print by the standards of long-end inflation-linked auctions, where thin liquidity and dealer balance-sheet costs more often produce concessions than stop-throughs. The composition here is the tell: indirect takedown well above the recent average with dealer awards near historical lows is the signature of end-user sponsorship rather than dealer warehousing, the configuration that has historically held up best into the after-market. The counterpart is that domestic direct bidding ran light, so the print leans heavily on foreign and institutional real-money appetite, the cohort that has tended to be the swing buyer at the long end of the linker curve. The yield stepping up from the prior auction reflects the broader rise in real rates over the interval rather than anything auction-specific. Worth noting is that strong TIPS receptions have not reliably translated into direction for nominals; the cleaner read-through is into breakevens, where sustained real-yield demand against steady inflation expectations compresses the inflation premium. Follow-ons are the subsequent long-end nominal supply and whether dealer awards stay compressed across the auction cycle.