Crude prices jumped more than 5% after the U.S. revoked sanction waivers on Iranian oil, a move that followed attacks on commercial ships in the Strait of Hormuz. The reinstated sanctions lifted Treasury yields and pushed equities lower.
Oil surged after the U.S. government revoked its sanction waivers on Iranian oil, a reversal triggered by attacks on commercial ships. Brent crude futures climbed more than 5.1% to $75.65 per barrel, while WTI futures rose 5% to $71.99. Prices sat well below wartime highs but above prewar levels.
Treasury revokes the Iran waivers
The Office of Foreign Assets Control, part of the Treasury Department, announced it was revoking the wind down in Iran oil sanctions that had been issued as part of the peace agreement. The document phases out authorizations for the production, delivery, and sale of Iranian crude oil, petrochemical products, and petroleum products that were granted on June 21, 2026.
The reinstatement came after commercial ship attacks in the Strait of Hormuz, a critical chokepoint in the global energy trade and a key sticking point in U.S.-Iran negotiations. The two sides had been advancing a comprehensive agreement covering nuclear limits and sanctions relief, but the risk of retaliatory escalation could stall those talks at any time.
Markets price in the disruption
The strait carries one-fifth of the world's oil trade volume alongside large liquefied natural gas shipments, so any disruption to shipping transmits quickly to global energy markets. The world's largest shipping industry association said transit through the strait may decline after the latest incidents, though some shipowners will still risk the passage.
Inflation worries returned as well, with the 10-year Treasury yield rising above the critical 4.5% level. Because higher energy costs feed directly into consumer prices, the move rekindled fears of renewed inflation. Equities reacted in kind: the Nasdaq sank deeper into the red, while the S&P 500 and the Dow came under pressure.
For Iran, oil exports remain its economic lifeline under the sanctions regime, with crude sales to China serving as the core source of fiscal revenue. Should peace talks collapse and sanctions tighten again, compounded by disruptions to shipping in the strait, the Iranian economy would face a double blow.
Sources: Barron's, TradingKey
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