The war just hit commercial shipping. Two oil tankers — one Saudi, one South Korean — were struck by projectiles overnight in the Strait of Hormuz. Brent spiked above $95 before settling near $91. The 10-year Treasury yield hit its highest level since January 2025. The S&P fell 0.7% to about 7,632 — its lowest since August 4. The Dow dropped 418 points. The Nasdaq fell 1%. Bond yields surged worldwide in a global sell-off driven by the same calculation in every market: $95 oil flows straight into inflation, and inflation flows straight into rate hikes. ISM manufacturing came in at 54.6 — still expanding, but the prices index stuck at 71.1 tells you input costs aren't coming down. Apple opened up nearly 3% on John Ternus's first day as CEO, then reversed and closed down 1.8% as the afternoon bond sell-off swallowed the morning's enthusiasm. Palo Alto Networks fell 5.7%. Dell slid 4.3% ahead of earnings. September has arrived. It's the worst month of the year for stocks. And it opened with oil tankers on fire.
Broad selloff, bond-driven. The S&P fell 0.7% to about 7,632 — its lowest close since August 4. The Dow dropped 418 points, or 0.8%, to about 52,768. The Nasdaq pulled back 1% to roughly 26,107. Energy was the only sector to gain meaningfully, rising about 1% on the oil spike. Tech fell 1.2%. Materials dropped 1.3%. Communication services lost 0.7%. Eight of eleven sectors closed red. The global bond sell-off was the session's backdrop — Treasury yields, European bunds, and Asian government bonds all rose simultaneously as $95 oil repriced inflation expectations worldwide.
| The Numbers I Circled | At the close, September 1 · Day change |
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| S&P 500 | 7,632 | −0.7% |
| Dow | 52,768 | −0.8% |
| Brent Oil | $91.07 | +0.6% |
| S&P 500 Sectors | Day change |
|
| Energy | | +1.0% |
| Health Care | | +0.4% |
| Consumer Staples | | +0.3% |
| Utilities | | 0.0% |
| Financials | | −0.1% |
| Real Estate | | −0.1% |
| Industrials | | −0.6% |
| Comm. Services | | −0.7% |
| Consumer Disc. | | −1.0% |
| Info. Technology | | −1.2% |
| Materials | | −1.3% |
| | Notable Gainers | Day change |
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The tanker attacks were the overnight catalyst. Two oil tankers were hit by projectiles Monday night while transiting the Strait of Hormuz — one Saudi-owned, one South Korean. The attacks came hours after Trump warned the U.S. would destroy an Iranian bridge or power plant each time Tehran attacks a ship in the Strait. Brent crude spiked above $95 per barrel before settling near $91. The intraday spike tells you the market's worst fear — disruption of the 20% of global oil that transits the Strait — is now being tested in real time. The settlement near $91, well off the $95 high, tells you the market still expects containment. Both readings matter.
The ISM manufacturing report came in mixed. The headline at 54.6 was down 1 point from July and below the 55.3 consensus — the expansion is slowing. But the prices index held at 71.1 — input costs aren't falling. Employment edged down 1.6 points to 51.2. The combination — slowing growth, sticky prices — is the economic setup Warsh warned about Friday. If growth slows but prices stay high, the Fed has no good options: cutting helps growth but feeds inflation, hiking fights inflation but risks a recession.
Apple told the whole session's story in one stock. Ternus's first day as CEO opened with a nearly 3% rally — the market approving the transition. By the close, Apple was down 1.8%. The afternoon bond sell-off erased the morning's enthusiasm. When yields surge, even good news can't hold. Palo Alto Networks fell 5.7%. Dell slid 4.3% ahead of its after-hours earnings report. SpaceX dropped 4.1%. Amazon lost 2.1%. Goldman Sachs fell 1.9%. Duolingo jumped 6% on an analyst upgrade. Chevron gained 1.8% and Exxon rose 0.9% — the only winners were the stocks that pump oil.
What The Market Is Pricing In
When tankers get hit in the Strait of Hormuz, the market prices it differently than a military base being struck. Military strikes are state-on-state — they have rules, they can be calibrated, they can be de-escalated through diplomatic channels. Hitting commercial ships is different. It threatens the supply chain that moves 20% of the world's oil. When commercial shipping is at risk, insurance premiums spike, shipping companies reroute, and the cost of moving oil rises even if the oil itself isn't destroyed. That cost gets passed through to gasoline, to jet fuel, to every product that moves by truck or ship. On Wall Street they call this supply-chain repricing — the market marks up the cost of everything that moves through the disrupted corridor.
That's why the global bond sell-off happened today. It wasn't just U.S. Treasuries — European bunds, Japanese government bonds, and emerging market debt all sold off simultaneously. When every bond market in the world sells off on the same day, the signal isn't about one country's central bank. It's about a shared input that changes every economy's inflation outlook at once. In this case, the input is oil. The 10-year Treasury yield hit its highest level since January 2025. That's not the Fed tightening. That's the bond market tightening for the Fed — pricing in higher inflation and a higher probability that Warsh's "discipline" becomes a September hike.
Two tankers were struck in the Strait and the 10-year yield hit its highest since January 2025, and the market is telling you that the war has crossed a line — from military installations to commercial shipping — and that line changes the inflation math for every central bank on earth, because disrupted shipping through the world's most important oil chokepoint isn't a one-day price spike, it's a structural repricing of energy costs that flows into every CPI print for the next six months. The S&P fell to its lowest since August 4 — erasing three weeks of gains. The entire rally from 7,632 to 7,800 and back happened between the start and end of August. Now September starts with the index back where August began, oil at $91 and touching $95, yields at 2025 highs, and the ISM telling you growth is slowing while prices aren't.
In September 2019, drones struck Saudi Aramco's Abqaiq processing facility, temporarily knocking out 5.7 million barrels a day of production — roughly 5% of global supply. Oil spiked 15% overnight. The S&P fell less than 1% and recovered within two weeks because the damage was repaired quickly. The lesson: one-off strikes are priced and forgotten. Repeated disruptions are structural. Today's question is whether the tanker attacks are a one-off — or the start of a pattern that reprices oil for the rest of the year.
Three things I'm watching this week:
01 — Does the Strait stay open for commercial traffic?
The tanker attacks test whether the Strait of Hormuz remains a functioning shipping corridor or becomes a war zone. If more ships are hit this week, insurance premiums spike, shipping reroutes accelerate, and Brent pushes toward $100. If the attacks stop — either because the U.S. deters them or because Iran signals restraint — Brent settles back below $88 and the bond sell-off reverses. The shipping insurance market is the canary in the coal mine: watch Lloyd's of London war-risk premiums for Hormuz transit.
02 — Dell earnings tonight, then CrowdStrike Thursday
Dell reports after today's close. The PC and server maker is a read on both AI infrastructure demand (server sales) and consumer spending (PC sales). CrowdStrike reports Thursday. After Palo Alto's 5.7% drop today, cybersecurity sentiment is fragile. If Dell and CrowdStrike both beat, tech stabilizes despite the oil and yield headwinds. If either disappoints, the Nasdaq's 1% decline deepens.
03 — Friday's August jobs report: September 5
The most important data point before the September 17 FOMC meeting. Warsh's "discipline" framework is data-dependent. A strong jobs report with wage growth above 4% confirms the economy is hot enough to hike. A weak report — especially if the unemployment rate ticks above 4% — gives the Fed cover to hold despite oil. The market is pricing roughly 60% odds of a hike. Friday's jobs number either confirms that pricing or challenges it.
September opened with tankers on fire, oil at $95, and the 10-year yield at a 20-month high. The S&P is back where it started August. The market built a thesis — AI carries the growth, sanctions bring oil down, the Fed holds — and the Strait of Hormuz just blew through it. The jobs report Friday and CPI on September 10 determine whether Warsh hikes. The Strait determines whether it matters.
That's it for today. See you tomorrow after the close.
— Tom Hartley
Today In Perspective · Published daily, Monday–Friday, after the close
This newsletter is for informational purposes only and does not constitute investment advice. The author is not a registered investment advisor. Past performance does not guarantee future results. Consult a qualified financial professional before making investment decisions.
