How oil and a 2002 yield high undid Wall Street's record week

The S&P 500 closed above 7,800 for the first time on Tuesday, finishing at 7,818.93. By Thursday's close it was back down at 7,765.36. A record set and handed back inside 48 hours is the shape of Wall Street's week — and what took it back was not the equity market at all. It was the bond market, and behind the bond market, oil.

That is the thread running through all five of the morning notes we published this week, and it is worth saying plainly because the index levels on their own hide it. The S&P 500 is roughly where it started. Underneath, the market changed its mind twice.

Our own sentiment readings tracked the turn in real time: Mixed on Monday and Tuesday, Cautious by Wednesday, Risk-off on Thursday — the only such reading of the week — and back to Cautious this morning. The pivot was Wednesday, and it had a timestamp.

How the week unfolded

Monday belonged to dealmaking. We led on PTC, the industrial software group, indicated some 35% higher before the bell after France's Schneider Electric agreed to buy it for $22.6bn in cash — $205 a share, a 42.3% premium to the previous close, and the largest deal Schneider has ever done. The index finish was solid: the S&P 500 rose 0.66% to 7,773.95, the Dow added 0.18% to 51,267.90 and the Nasdaq Composite gained 1.05% to a record 27,477.31.

We also flagged Monday's one scheduled data point, September's ISM services survey, with consensus near 55.1. It landed at 54.9 — a shade light, and on the headline a non-event. The number that mattered was buried in the sub-indices: the prices-paid component jumped to 74.0, its highest since July 2022. For a UK reader, that gauge is the closest thing the American service sector has to a monthly inflation thermometer, and it was the first sign this week that the oil story was feeding through into costs.

Tuesday extended the rally and produced the week's high-water mark. Alongside a fresh healthcare deal — Option Care Health up more than 20% premarket on reports McKesson and Clayton, Dubilier & Rice were in advanced talks at above $5bn — the S&P 500 rose 0.58% to 7,818.93 and the Nasdaq Composite 0.45% to 27,599.79, both records. The Dow closed up 0.49% at 51,521.28. Helpfully for equities, Brent fell 2.3% to $97.99 a barrel on reports that Saudi-backed Yemeni forces had retaken the Red Sea port of Mokha.

Wednesday is where it turned, and we had said in that morning's note what to watch: a $39bn auction of 10-year Treasury notes, part of a $119bn slate of government debt sales that week, and the minutes of the Federal Reserve's September meeting at 2pm New York time. Both landed. The auction itself went well — yields eased on decent demand — but the minutes showed a committee openly split.

This is the part that needs spelling out for a British audience, because it inverts the assumption most readers carry. The Fed is raising rates, not cutting them. Under new chair Kevin Warsh it lifted its benchmark a quarter point to 3.75%–4.00% on 16 September, the first increase since 2023, and the September minutes revealed genuine disagreement about how much further it has to go to contain oil-driven inflation. Markets took that badly. The Dow fell 341.41 points, or 0.66%, to 51,179.87; the S&P 500 slipped 0.22% to 7,801.77 and the Nasdaq Composite 0.22% to 27,538.69. The small-cap Russell 2000, the most rate-sensitive corner of the US market, dropped 1.31% to 2,793.36 — the tell that this was a borrowing-costs story, not a tech story.

Thursday was the week's worst session and the one we marked risk-off. Crude's advance pushed the 10-year Treasury yield to 5.31% and later 5.36%, its highest since 2002 — and then a second, unrelated shock hit the AI complex. OpenAI's annualised revenue run-rate was restated to roughly $50bn, against the $68bn figure that had circulated in late September. The Nasdaq Composite fell 1.25% to 27,193.34 and the S&P 500 0.47% to 7,765.36. The Dow, with far less AI exposure, actually finished up 0.1% at 51,231.64 — a 1.35-percentage-point gap between the two indices in a single session, which is a reasonable measure of how concentrated the damage was.

Friday is still trading as we publish. It is just past 1pm in New York and the closing bell is three hours away, so what follows is a snapshot and not a result. As of early afternoon the S&P 500 was around 7,808, up roughly 0.55%, the Dow near 51,607 and the Nasdaq Composite about 27,343, with tech clawing back part of Thursday's fall as oil eased and the 10-year yield came off its highs. Where any of it finishes, we do not yet know.

One Friday number is already fixed, and it is not encouraging. The University of Michigan's preliminary October consumer sentiment reading, which we flagged this morning with a forecast near 47.6, came in at 46.3 — a five-month low, with the survey's assessment of current conditions at an all-time low and year-ahead inflation expectations ticking up to 4.7%.

The names that moved it

Delta Air Lines is the one to dwell on, because it closed the week's loop. We named it on Monday and again on Thursday as the week's scheduled earnings event, and when it reported on Friday morning it turned the week's macro story into a line in a profit-and-loss account. Delta posted record September-quarter revenue and adjusted earnings of $1.72 a share, just under the $1.75 expected — but cut full-year adjusted guidance to $5.10–$5.60 a share from the $6.50–$7.50 it gave in July. The entire revision was fuel: third-quarter fuel expense rose 62% year-on-year to $4.1bn, more than $500m above budget. Shares fell about 4% premarket. That is the clearest illustration available of why a crude price matters to an equity portfolio. You can follow the name on Delta Air Lines.

Oracle took the sharpest single hit, closing Thursday down 5.48% at $135.69 on the OpenAI restatement, given how much of its forward revenue is tied to its cloud agreement with the company. Nvidia — the name we mentioned in more of this week's notes than any other — led on Monday and Tuesday and then fell close to 3% on Thursday, a fair summary of the week in miniature. Broadcom slipped more than 4% in the same session, even as it was reported to be arranging over $50bn of financing for its custom-silicon partnership with OpenAI. Our Oracle page carries the detail.

Away from AI, PTC was the week's largest corporate event in cash terms at $22.6bn, and Constellation Brands supplied a useful reminder about American earnings conventions: it beat on both revenue and earnings for its fiscal second quarter and still fell nearly 5%, because its fiscal 2027 guidance of $11.20–$11.90 a share came in lighter than hoped. In US reporting season the forward guidance routinely matters more than the quarter just delivered — a distinction that catches out British investors used to less forward-looking statements. You can screen the week's movers on our screener.

What to watch next week

• Tuesday 13 October — third-quarter earnings season opens properly, with JPMorgan Chase, Goldman Sachs, Wells Fargo and Citigroup all reporting. After a week in which the Russell 2000 flagged rate stress, bank commentary on borrowing costs will carry more than usual.
• Wednesday 14 October — US consumer price index for September. Given the ISM prices-paid reading of 74.0 and crude above $100, this is the week's main event.
• Friday 23 October — the University of Michigan's final October sentiment reading, revising today's 46.3.
• 27–28 October — the Federal Open Market Committee's next policy decision, the first since September's rate rise and the divided minutes published this week.

Also worth noting: the US federal government shutdown ran through this entire week, which has delayed or suspended some official statistical releases. Where a government data point is missing in the days ahead, that is the reason.