Iran Re-Closes Strait of Hormuz, Threatening Oil Spike Over 15%

(Bloomberg) — Global oil markets were thrown into turmoil after shipping sources reported that Iran’s navy has re-closed the Strait of Hormuz to all commercial traffic, a move that unravels a week-old diplomatic agreement and threatens to send crude prices surging more than 15 percent. The action effectively reinstates a naval blockade that had crippled nearly 25 percent of the world’s seaborne oil trade for months, pushing Brent crude futures back toward the $100 per barrel mark.

“A load-bearing assumption in energy until February 28... was the United States will never allow anyone to restrict commercial flow through the Strait of Hormuz,” Bob McNally, founder of the Rapidan Energy Group, told TIME during the initial blockade. “This is without precedent.”

The closure immediately prices back in the severe “war premium” that had just vanished from the market. Only days ago, the reopening of the strait caused Brent crude to plunge 14.2% to $82.70 a barrel. The waterway is the conduit for approximately 20.9 million barrels of oil per day, and its closure effectively removes a massive volume of supply that has no viable near-term alternative route.

At stake is the fragile global economy, which is now staring down the barrel of a renewed energy shock just as it began to price in a peace dividend. The move jeopardizes the ceasefire that began on April 7, reignites inflationary pressures, and raises the specter of a wider conflict that could drive the world economy toward a significant slowdown.

Fragile Ceasefire Collapses

The announcement represents a stunning and abrupt reversal of the diplomatic progress made just last week. A deal brokered in Muscat, Oman, had seen the strait reopen to commercial traffic, with both Washington and Tehran signaling a desire to de-escalate after the “Energy Shock of 2026” began with military strikes in late February. That agreement now appears to be in tatters, and the multinational naval task force that was to ensure safe passage is once again on high alert.

The impact will be felt most acutely in Asia, the destination for over 80 percent of the oil transiting Hormuz. Nations like Japan and South Korea, which are almost entirely dependent on these shipments, will face immediate supply disruption. The ripple effects will quickly spread to Europe and the United States, as higher global crude prices translate to more expensive gasoline, jet fuel, and manufacturing costs, complicating the inflation fight for central banks. The path forward depends on whether this closure is a temporary negotiating tactic or a definitive return to hostilities.

This article is for informational purposes only and does not constitute investment advice.