Credit led, equities followed, the index arrived last — and the rally stopped five basis points short of the mark

The ten-year Treasury closed the week at 5.00%, nine basis points lower Friday to Friday, after touching 4.96% on Thursday — the largest one-day rally since August 2024 — and giving four back on Friday. That low sits 35 basis points below the 5 October high of 5.31%. Research note 03 set 40 as the historical marker for an episode ending; by the note's own rule the trend is not yet over, by five basis points. The two-year fell five on the week to 4.69%, the thirty-year ten to 5.33%, and swaps fell further than Treasuries — the ten-year SOFR par 4.71% to 4.60% — so the ten-year swap spread, which had reached a one-year high of −33 on Thursday as the flight went into cash Treasuries, closed back near −40. Breakevens did nothing: the ten-year CPI swap 2.456% to 2.452% with Brent at $114. The whole move, again, was real yield.

The week's story is a sequence, and every leg of it is dated on this site's tape. First the single names: on the SEC file, which names the reference entity, the AI-capex chain repriced for three months before anyone noticed — Oracle five-year protection 37 basis points in June 2025 to 314 on Thursday, Broadcom 31 to 156, Nvidia 43 to 116, Meta 73 to 119, AMD 53 to 110 and now written half the time on the high-yield coupon, CoreWeave on the 500 coupon from its first print with an implied spread above 1,100. The month's widening table, among names with six or more priced prints in each window, is Oracle, Broadcom, Meta, Alphabet, Intel, Amazon, Nvidia and nothing else. Then equities: the chain's stocks fell two to eight percent on Wednesday and the VIX went from 16.7 to 19.0. Then, last, the index: CDX IG 61.2 to 62.8 through Thursday, iTraxx Crossover 296 to 312, EM 163 to 171, Main 63 to 66 — 90th-percentile weekly moves — and wider again on Friday, with market reports putting the US index at its highest since March and global corporate spreads at their widest since May 2025. The index moved last and least, because the repricing happened name by name underneath it.

Rates and credit decoupled in the process. The 60-day correlation of CDX IG with the ten-year went from +0.56 on 18 September to 0.05 on Thursday, its lowest since March. For the books this site follows that is the first time since March that the two legs of a Part C replication have moved against each other: the five-year replication yield lost 16 basis points on Thursday to 5.41%. The insurer-shaped flow did not chase — long receivers 52 a day against 66 the week before, insurer-shaped IG prints 180 against 226. One thing did move: with the 10y10y forward touching 5.00%, the outright hurdle buyer printed eleven times on Thursday, seven of them below 5.05%, against three of sixty-four in the prior seven sessions. Small, at $0.6bn, but it answers last week's question — the programme follows the forward down through 5.05% rather than waiting for it to come back.

Why the names first? Because of what sits under the tier. The collateral behind the leveraged end of the chain is a three-to-five-year asset whose manufacturer sets the pace of its obsolescence, with no residual-value history, no independent secondary market, and value only while it is energised, cooled and networked in a building the borrower often does not own — plus a backstop from the party that sells it, which is the form of support aircraft finance learned to discount in the 1990s when manufacturers' residual guarantees were called all at once. A GPU is not an aircraft: no maintenance reserve keeps it at a deliverable condition, nothing flies it away from a bankrupt lessee, and there is no cycle of data behind any residual curve anyone has written. Lenders have been pricing it with the parameters of a mature asset class, which is what subprime did with prime's. The protection market worked that out name by name; Research note 04, in preparation, takes the collateral apart from the standpoint of someone who built the residual-value models for the mature class.

Two things about the credit side are worth stating plainly. The repricing crossed a regulatory boundary: CDX and iTraxx are swaps and report to the CFTC's public file; single-name CDS are security-based swaps and report to the SEC's. Watching only the first, credit did little until Thursday; watching only the second, a sector repriced over a quarter. Neither file alone shows the move. And the mechanism the market now names is supply — one hyperscaler said this week it is looking at raising hundreds of billions against $825bn of spending agreements — and the natural buyer of that paper is the life insurance balance sheet, which already holds at least $1.2bn of Oracle at NAIC 2, about $3bn of hyperscaler bonds and $3.9bn of data-centre securitisations across the eight statutory books parsed here, and which the lowest-rated tier of the chain said this week it intends to borrow from. The chain's funding is arriving at the insurers from above and below in the same month; the Q3 statements due 15 November will show whether anyone said yes.

Oil belongs in the same frame rather than a separate one. Brent at its highest since May moved neither breakevens nor the long end; the few WTI swaps on the commodities tape two to three years out printed at $71–78 against a $100 front, a backwardation that prices a supply shock, not a regime. Where oil did show was in the single names — Pemex the biggest non-chain widener of the quarter, Transocean and American Airlines migrating to the high-yield coupon alongside a consumer cohort.

Rates volatility, meanwhile, never left: 3m10y 97 to 104 on the week, 1y10y steady at 104, and ten-year realised vol at 109 basis points caught implied for the first time since 2 October. Liquidity is good until it isn't, as a Barron's columnist of long memory used to say; this week the tape showed the order in which it stops — at the bottom of the capital stack first, in the names before the index, and in the Treasury market last of all, which bought everything anyone sold.