US Crude Stocks Depleted as Hormuz Shock Unwinds, SPR Left Thinner
American crude oil inventories fell for the fourth consecutive week in mid-May as Gulf supply disruptions from the de facto closure of the Strait of Hormuz overwhelmed a steadily depleted US Strategic Petroleum Reserve, pushing stocks 7% below seasonal norms even as markets began pricing in an eventual reopening.1,3
The American Petroleum Institute estimated a draw of 9.1 million barrels for the week ending May 15 (2026-05-15), nearly triple the 3.4 million barrel consensus, according to API data. The Energy Information Administration's separate weekly report showed a 4.6 million barrel draw for the week of May 11 (2026-05-11), bringing total crude stocks to 428.3 million barrels, 7% below the five-year average for that time of year.3,2
The scale of the supply shock behind those draws was significant. Military action on February 28, 2026 effectively closed the Strait of Hormuz. EIA analysts assessed in mid-May that Iraq, Saudi Arabia, Kuwait, the UAE, Qatar, and Bahrain collectively shut in 10.5 million barrels per day of crude production in April. The Persian Gulf normally channels around 20 million barrels per day to global markets.6,1
Global strategic stockpiles absorbed the initial shock at what the International Energy Agency described as a record pace. Governments and industry had released a combined 164 million barrels of strategic and commercial reserves as of May 8 (2026-05-08), and the IEA warned that rapidly shrinking buffers could trigger further price instability if disruptions persisted.5
US emergency reserves depleted alongside commercial stocks. The SPR was drawn down by 10 million barrels over the period, registering a 6.6% annual decline, according to data reviewed on May 20 (2026-05-20). Each week of further drawdown narrows the reserve's capacity to absorb the next supply shock.1
Prices peaked at $120 a barrel in March as the Hormuz closure rippled through physical markets, then began a volatile descent. ICE Brent crude front-month closed at $109.26 a barrel on Friday, May 15 (2026-05-15), as China offered no signals it would pressure Iran to normalise tanker traffic. By Wednesday, May 20 (2026-05-20), WTI crude front-month fell more than 5% to $98.61 after US President Trump said talks with Iran were in their "final stages."5,1
The subsequent repricing has been pronounced. WTI crude front-month was trading at $71.37 a barrel on Thursday, June 25 (2026-06-25), while ICE Brent crude front-month stood at $74.58, both reflecting a market that has moved well past the acute crisis premium from spring.
Yet low prices do not reset inventories. US crude stocks were already 7% below seasonal norms when mid-May data was reported, and restoring that buffer requires sustained elevated imports even with tanker traffic normalised. Woodmac analysts noted in late May (2026-05-20) that the fleet of empty tankers dispatched earlier had begun loading cargo and returning to US terminals, suggesting the physical pipeline was beginning to reconstitute itself.4
The pace of Gulf producer restarts determines how fast that process completes. EIA assessed that 10.5 million barrels per day remained shut in across six major producers through April, but actual restart timelines hinge on wellhead integrity, infrastructure condition, and the diplomatic terms of any resolution — parameters that remained opaque in mid-May and have not been publicly quantified since.6
Gasoline inventories fell a further 700,000 barrels in the same reporting period as crude, and product demand showed no sign of retreating despite elevated pump prices, adding another layer to the restocking problem heading into the peak US summer driving season.2