The Iran Truce Expired, Oil Hit $90, and the 30-Year Yield Hit a Decades High. Stocks Slid to Start Retail Week.

The war came back, and the market flinched. Stocks fell Monday after a US-Iran memorandum of understanding expired, oil jumped to $90, and President Trump said he doesn’t see the war ending anytime soon — reviving the inflation fears that have shadowed the rally all summer. The 30-year Treasury yield climbed to its highest level in decades, and the major averages pulled back from last week’s records: the S&P fell 0.52% to 7,745, the Dow dropped 273 points, and the Nasdaq slipped 0.32%. It was a risk-off open to a pivotal week — the July Fed minutes land Wednesday, and the retail giants (Home Depot, Target, Walmart) report the first corporate read on a consumer that just posted its weakest retail sales in nine months.

Here’s what mattered:

🛢️ The truce expired — oil to $90, war fears back

The geopolitical thaw reversed hard:

• The MoU lapsed: a US-Iran memorandum of understanding expired Monday, and President Trump said he doesn’t see the war ending anytime soon — dimming the de-escalation hopes that had pulled oil off its highs.
• Brent hit $90 a barrel; WTI climbed too, extending the energy premium that’s been the market’s main inflation worry.
• An offensive threat: a senior Iranian official told Reuters the country may shift to an offensive posture if diplomacy fails — explicitly threatening to escalate in the Strait of Hormuz, the chokepoint for ~20% of global oil.
• The signal: the expiring truce is the clearest sign yet that the summer’s on-again-off-again war is tilting back toward conflict — right as the market had started pricing peace.

📈 The 30-year yield hits a decades high — the bond-market warning

The rates move was the day’s most striking signal:

• Long end sold off: the 30-year Treasury yield climbed to its highest level in decades as the oil spike revived inflation fears.
• The verdict: it’s the bond market pricing the summer’s central tension — a Fed that may be forced to stay restrictive (or hike) even as growth softens — the stagflation shadow, in the long end.
• Orderly, not a rout: the pressure hit rate-sensitive corners hardest, but the damage stayed contained.
• Stakes raised: with the Fed in the run-up to Jackson Hole, the yield move raises the bar for Wednesday’s minutes and Warsh’s keynote the following week.

📉 The tape — a broad but contained pullback

Stocks eased from records without breaking:

• The indexes: S&P -0.52% → 7,745.06 (-40.70) — still near Thursday’s record close of 7,798.99 · Dow -0.51% → 53,459.78 (-272.63) · Nasdaq -0.32% → 26,644.91 (-84.25).
• Energy was the lone winner, rising with crude; L3Harris fell 4.6% after CEO Christopher Kubasik stepped down.
• Buffett vote: Alphabet dipped 0.5% even as Berkshire Hathaway disclosed it increased its stake in the Google parent — a notable show of confidence.
• Context: the indexes remain higher across August (the Dow on track for a fifth straight positive month), and last week the S&P cleared 7,800 for the first time before Friday’s pullback.

📊 Monday Snapshot

• S&P 500: -0.52% → 7,745.06 (-41 pts) · Dow: -0.51% → 53,459.78 (-273 pts) · Nasdaq: -0.32% → 26,644.91
• Geopolitics: US-Iran MoU expired · Trump: doesn’t see war ending soon · Brent hit $90
• Rates: 30-year Treasury yield at its highest in decades (oil-driven inflation fears)
• Movers: Iran signals possible “offensive” shift / Hormuz escalation · L3Harris -4.6% (CEO exit) · Alphabet -0.5% (Berkshire ups stake) · energy the day’s winner

📅 On deck — retail and the minutes

All times GMT, scheduled:

• TODAY (Tue Aug 18): building permits · housing starts · Home Depot earnings (pre-open) · Reddit joins the S&P 500
• WED (Aug 19) ⚡: FOMC MINUTES (July meeting, 18:00 GMT) · Target, Lowe’s earnings
• THU (Aug 20): jobless claims · Walmart earnings (pre-open) · Alibaba, Deere, Ross
• FRI (Aug 21): global flash PMIs · Philly Fed · existing home sales
• Ahead: Jackson Hole Aug 27–29 — Warsh’s first keynote as Chair.

🧠 Bottom line

The retail-and-minutes week that was supposed to be a quiet runway into Jackson Hole opened with the one variable no calendar can schedule: the war. An expired truce, oil at $90, and Trump signaling no end in sight brought the energy-inflation threat roaring back — and the 30-year yield’s climb to a decades high is the bond market saying it takes that threat seriously. After a week where cooling inflation pushed the S&P to a record 7,798.99, Monday was a pointed reminder that the summer’s central risk hasn’t gone anywhere.

That sets a tense stage for the week’s real tests. Wednesday’s minutes reveal how hawkish the Fed was in July — and now that hawkishness meets an oil price back at $90, not the falling crude of a month ago. Then the retail giants report into a consumer that just posted its weakest sales in nine months. If oil keeps climbing, the disinflation story that carried stocks to records is in genuine trouble, and Warsh walks into Jackson Hole with the hardest possible hand: sticky, energy-driven inflation on one side, a labor market shedding jobs on the other. Monday reopened the question the rally thought it had answered.

The truce expired, oil hit $90, and the long bond flashed a warning. The war is back — just as the Fed’s biggest week of the summer begins.