Iran sees record seven-week halt in crude exports through Strait of Hormuz

Iran’s crude oil exports through the Strait of Hormuz have effectively ground to a halt for seven consecutive weeks, the longest such disruption on record. The cause: a US naval blockade reinstated on July 14 that has turned one of the world’s most critical energy chokepoints into a parking lot for stranded tankers.

The numbers tell a brutal story. Iranian crude loadings collapsed to between 220,000 and 255,000 barrels per day in August, down from roughly 740,000 bpd in July. For context, Iran was pushing nearly 2 million bpd through the strait as recently as March. That’s an 87% drop in five months.

Tens of millions of barrels with nowhere to go

As of late August, 29 Iranian tankers were sitting inside the Strait of Hormuz holding approximately 36.11 million barrels of crude oil.

West of the blockade line, the situation isn’t much better. An additional 41.7 million barrels of Iranian crude sit in floating storage, effectively warehoused on the open water. Combined, that’s nearly 78 million barrels of oil trapped in maritime limbo, representing billions of dollars in stalled revenue for Tehran.

The blockade traces back to the broader US-Iran conflict that escalated in late February. After a brief suspension in mid-June that allowed a short-lived recovery in export volumes, renewed hostilities prompted Washington to reinstate the naval cordon in July. The result has been the most effective disruption of Iranian oil exports in modern history, surpassing even the tightest periods under previous sanctions regimes.

China feels the squeeze

China, by far Iran’s largest crude customer, can now only draw from existing floating storage reserves positioned across Asia. No new shipments are getting through to replenish those stocks.

Kpler analyst Homayoun Falakshahi has flagged the cascading economic consequences for Iran. With foreign-currency earnings cratering alongside exports, Tehran faces mounting pressure to finance government operations through monetary expansion, a path that leads directly to accelerating inflation.

The blockade’s effectiveness stands out precisely because it’s physical rather than financial. Previous US sanctions relied on threatening secondary penalties against banks and shipping companies that facilitated Iranian oil trade, with shadow fleets, ship-to-ship transfers, and opaque ownership structures enabling significant volumes to slip through. A naval blockade at the strait itself eliminates most of those workarounds.

Global oil markets on alert

The Strait of Hormuz handles roughly a fifth of the world’s daily oil consumption under normal conditions. The removal of nearly 2 million bpd of supply from global markets has created upward pressure on crude prices.

The broader risk extends beyond oil pricing. Any military escalation in or around the strait could disrupt non-Iranian shipping as well, threatening the roughly 20 million barrels per day of total crude and petroleum products that transit the waterway. Insurance premiums for vessels transiting the region have already climbed, adding friction costs throughout the supply chain.

Disclosure: This article was edited by Editorial Team. For more information on how we create and review content, see our Editorial Policy.