For decades, the Strait of Hormuz was described as the place where the global economy was most exposed, and the description always carried an implicit “if.” If Iran ever closed it. If tankers ever stopped moving. If the pipelines around it were ever tested at scale. In 2026 the “if” ran out. On February 28, the United States and Israel launched strikes on Iran, and within hours the Islamic Revolutionary Guard Corps was warning ships by radio that nothing would be allowed through. As of this writing, October 16, 2026, the UK Maritime Trade Operations centre has logged at least a dozen attacks on merchant ships in the past seven days, a container ship has sunk in the strait, and Washington and Tehran are each insisting that they, not the other, control the waterway.
The Geography, the Numbers, and the Old Consensus
The strait sits at the mouth of the Persian Gulf, connecting it to the Gulf of Oman and the Arabian Sea. Iran holds the northern shore; Oman’s Musandam Peninsula and the United Arab Emirates hold the southern one. At its narrowest the channel is about 21 nautical miles across, roughly 24 statute miles, and the water deep enough for the largest crude carriers is narrower still. Ships move through a traffic separation scheme of inbound and outbound lanes, each about two miles wide, with a buffer between them.
The volumes are what make the geography matter. According to the US Energy Information Administration, oil flows through the strait averaged 20 million barrels per day in 2024, about 20 percent of global petroleum liquids consumption and more than a quarter of all seaborne oil trade. Roughly one-fifth of global liquefied natural gas trade also passed through in 2024, nearly all of it from Qatar. The customers are concentrated in Asia: 84 percent of the crude and condensate and 83 percent of the LNG that transited the strait in 2024 went to Asian markets, and China, India, Japan, and South Korea together took 69 percent of the crude and condensate. Saudi Arabia was the largest single source at 38 percent of Hormuz crude.
Those are the figures from the last normal year. The EIA’s August 2026 Short-Term Energy Outlook put flows at 21.6 million barrels per day in late 2025 and at 4.9 million barrels per day in the second quarter of 2026.
The strait has been a theater of conflict before, which is partly why so many planners believed they understood the risk. During the Iran-Iraq War of the 1980s, in the period known as the Tanker War, both sides attacked shipping in the Gulf. Iran laid mines and struck vessels with missiles and small boats; the United States reflagged Kuwaiti tankers, escorted them, and in 1988 fought a direct naval engagement with Iranian forces. In 2019, after the US withdrawal from the 2015 nuclear agreement, Iran seized the British-flagged tanker Stena Impero, and seizures and harassment continued into 2023. The lesson most analysts drew was that Iran’s threat was partly a bluff: credible enough to move prices, too costly for Tehran to ever fully execute. That was the consensus on February 27, 2026.
Seven and a Half Months of Closure
The strikes began on February 28 under what the US called Operation Epic Fury, and Iran’s Supreme Leader, Ali Khamenei, was killed. Ship tracking showed traffic through the strait falling by about 70 percent almost immediately, and by March 1 and 2 some trackers recorded no transits at all. Iran formally declared the strait closed on March 4, and on March 5 protection and indemnity insurers withdrew cover for the zone. Brent crude went above 100 dollars a barrel on March 8 for the first time in four years.
What followed was a sequence of partial reopenings and renewed closures that never resolved into either outcome. A temporary US-Iran ceasefire was agreed on April 8, but talks in Islamabad failed on April 12, and the US announced a naval blockade of Iranian ports starting April 13. Analysts at the Swedish bank SEB described the strait on April 14 as essentially fully closed: Iran was blocking non-Iranian oil, and the US blockade was stopping Iranian oil. On April 18 Iran declared the strait closed again in response to the blockade and fired on two Indian-flagged ships. On April 21 the International Maritime Organization reported roughly 20,000 mariners and 2,000 ships stranded inside the Gulf. Brent futures briefly touched about 126 dollars a barrel on April 30, their highest level in four years.
On May 4 US Central Command launched Operation Project Freedom, an escort mission for merchant vessels; the White House paused it the next day citing progress in talks. Iran set up a “Persian Gulf Strait Authority” on May 5 to regulate transit on its own terms. By early June, Kpler still counted about 412 ships trapped or waiting in the Gulf and described the trickle of US-guided transits as a triage system rather than a functioning trade corridor.
On June 17 the US and Iranian presidents signed the Islamabad Memorandum, meant to end the war and lift both blockades. Brent was around 71 dollars on July 1. The arrangement collapsed on July 8 after Iran struck several commercial ships; the IRGC Navy declared the strait closed again on July 12, and the US reinstated its blockade on July 14. Through August the strait stayed, in SEB’s words on August 10, “essentially closed,” even as Brent traded in the mid-80s on hopes of a deal. On August 25 US officials said the Navy had cleared mines from the traffic separation scheme, after underwater drones identified more than 100 suspected mines.
September brought the first real recovery, and the clearest demonstration of what it depends on. The US military opened and escorted a route along Oman’s coast, and Gulf exporters began using it in volume. The IEA put total oil flows through the strait at 10.9 million barrels per day in September. Saudi exports reached about 6 million barrels per day that month, up from 3.4 million in August. Kpler’s Matt Smith read the ramp-up partly as necessity, because the Saudi bypass pipeline had just been knocked out, and partly as “a greater confidence in using the Strait of Hormuz.” That confidence did not survive October.
What the Market Did
Futures, physical cargoes, refined products, gas, and insurance all moved differently, which is why the closure has hurt some economies far more than the Brent chart alone suggests. Crude futures swung in a wide band: above 100 dollars on March 8, the 126 dollar intraday high on April 30, about 71 on July 1, 84.64 on August 10, nearly 110 after the East-West pipeline shut in mid-September, and 101.20 on October 5. Brent closed at 105.69 dollars on October 13 and touched 110 on October 16, its first visit to that level since May.
Refined products have been tighter than crude. The IEA reported in early September that US diesel and gasoil were trading above 200 dollars a barrel, 94 percent above pre-war levels, and this week it warned that the global diesel shortage could last well into 2027. Middle Eastern refined product shipments averaged 1.9 million barrels per day in September against 4.7 million before the war, because the Gulf’s export refineries have no pipeline around the strait.
Gas followed its own path. QatarEnergy declared force majeure on March 4. The EIA reported that no laden LNG vessel was known to have crossed the strait between March 1 and April 24, taking more than 10 billion cubic feet per day, about 20 percent of global LNG supply, offline. By the week ending April 24 the East Asian JKM benchmark was up 51 percent from its pre-closure level at 16.02 dollars per million British thermal units, and Europe’s TTF was up 35 percent at 14.80 dollars. Qatar’s force majeure has been extended repeatedly, most recently in late September, when Bloomberg and The National put spot LNG prices in Europe and Asia at their highest since late 2022.
Insurance is where the closure shows up most directly in a shipowner’s decision. Before the war, war-risk cover for a Gulf transit ran around 0.25 percent of hull value, according to Marsh’s Marcus Baker. By July the range was 3 to 10 percent, meaning a 100 million dollar tanker was paying between 3 million and 10 million dollars for a single voyage rather than roughly 250,000. Escorts have not solved it: in June, ships sailing under US naval escort were still buying war-risk cover at about 4 percent of hull value for a seven-day policy.
How the Importers Coped
Every major Asian importer lost most of its Hormuz supply at once. Kpler data showed China’s imports through the strait falling from 4.45 million barrels per day before the war to about 222,000 in April, and India’s from 2.8 million in February to about 247,000. What differed was the cushion each country had built.
China had the deepest. Analysts at Columbia University’s Center on Global Energy Policy estimated that China’s stockpiles could cover three to four months of demand, and that 45 to 50 percent of its crude imports depended on Hormuz. Beijing halted new fuel export contracts on March 5 and largely drew on inventories rather than bid for expensive replacement cargoes. By June, Chinese customs data showed crude imports down 40 percent year on year at about 7 million barrels per day, and refinery utilization had dropped below 60 percent.
India had the thinnest. Industry estimates put its buffer at about 30 days. New Delhi kept refineries running and bought wherever it could: Russian crude rose to 47 percent of Indian imports in March from around 20 percent in February, helped by a US waiver issued on March 5 permitting purchases of sanctioned Russian oil. Total Indian imports still fell more than 14 percent from pre-war levels. The government cut excise duty on petrol and diesel on March 27, then allowed the first retail price increases in more than four years in May. Consumer inflation reached 5.54 percent in September, and on October 7 the Reserve Bank of India raised its policy rate for the first time since February 2023.
Japan, which took more than 90 percent of its crude from the Middle East before the war, leaned on reserves. Prime Minister Sanae Takaichi announced a unilateral release of 80 million barrels, and the drawdown began on March 16, days before the IEA’s coordinated release; a second round in May took the total to about 90 million barrels. Its imports of Saudi crude were still down 41.2 percent year on year across April through July.
South Korea took a different route and, on the evidence so far, a more successful one. Instead of large releases, the government ran a swap system, lending crude to refiners and taking replacement barrels when their delayed cargoes arrived; about 26 million barrels moved through it between March and June. Seoul rerouted roughly 50 million barrels around the strait in April and May, including through Saudi Arabia’s Red Sea port of Yanbu, expanded shipments through Fujairah, and secured Saudi agreement to prioritize 200 million barrels for Korean buyers from June through year-end. Trade, Industry and Energy Minister Kim Jung-kwan pressed Saudi and UAE officials in March to help Korean companies secure crude through Yanbu and Fujairah.
Europe’s exposure ran through gas and products rather than crude. Slovenia became the first EU country to ration fuel on March 23, Germany announced two months of fuel tax cuts on April 13, and the EU’s energy commissioner, Dan Jørgensen, said in the spring that member states had already incurred more than 30 billion euros in extra fossil fuel import costs.
Then there is the collective response. In March, IEA members agreed to make 400 million barrels available from strategic reserves, the largest coordinated release in the agency’s history; the US share was 172 million barrels drawn over 120 days. By October 16 about 330 million barrels had actually been released, and the IEA’s Governing Board agreed this week to accelerate the remaining roughly 100 million, including more than 20 million barrels of diesel.
The Bypasses That Were Supposed to Save Us
Before the war, the standard reassurance was that Saudi Arabia and the UAE could route a few million barrels a day around the strait by pipeline. That turned out to be true, and nowhere near enough.
Saudi Aramco’s East-West pipeline runs about 1,200 kilometers from Abqaiq to Yanbu on the Red Sea. Its nameplate capacity is 7 million barrels per day, though Aramco said on March 10 that about 5 million could be made available for export with the rest feeding domestic refineries. Kpler data showed flows averaging 770,000 barrels per day in January and February and rising to 2.9 million by late March. The UAE’s Abu Dhabi Crude Oil Pipeline runs 380 kilometers from Habshan to Fujairah on the Gulf of Oman, with a capacity of about 1.5 million barrels per day. Iraq’s Kirkuk-Ceyhan line to Turkey is rated at 1.6 million barrels per day but was carrying about 200,000 in March, and Iraq’s southern fields have no meaningful inland link to it. Kuwait and Qatar have no bypass at all. Add it up and the three pipelines, fully used, could carry something under half of what the strait normally does, and they were not fully used.
They were also targets. Iranian drones hit Fujairah’s loading operations in March. Iran struck the East-West line in April, cutting throughput by an estimated 700,000 barrels per day. On September 10 drones launched from Iraq hit the pipeline again, and Saudi Arabia shut the whole system the next day as a precaution; industry sources told Reuters it restarted at low volumes in the week of September 21, though Riyadh did not confirm it. The Red Sea exit from Yanbu, meanwhile, runs past Houthi-controlled Yemen, and Houthi attacks on Saudi energy infrastructure were adding to the disruption by early October.
The LNG bypass does not exist. Qatar’s Ras Laffan complex has no alternative outlet, which is why the largest exporter of LNG has been under force majeure since the first week of the war, why the Asian buyers who take more than 80 percent of Qatari gas have been in the spot market all year, and why Europe is heading into winter with less term supply than it contracted for.
Where Things Stand on October 16
The month began with the strait looking more open than at any point since February. Kpler’s provisional data showed outflows of 19.5 to 22.5 million barrels per day on September 27 through 29, and on October 8 nearly 20.8 million barrels passed through, both above the pre-war average. Then Iran changed tactics. An Iranian official told Reuters that Tehran had adopted “different offensive tactics” about ten days before October 14, with the US midterm elections on November 3 among the targets of the pressure. The IRGC said it would pursue any ship that did not coordinate with its Persian Gulf Strait Authority, deployed new naval units east of the strait to track traffic, and warned ships not to switch off their transponders.
The IMO counted eleven tankers attacked in the week ending October 4, the most since the war began, and UKMTO recorded 15 attacks between October 6 and 14. The Singapore-flagged container ship GFS Pride was struck on October 13 and sank; Iran said it hit a mine, the US said it was an IRGC projectile. UKMTO’s count for the week ending October 16 is at least 12 attacks, and it says most attacked vessels refuse to report, so the true figure is higher.
Flows have collapsed again in response. Kpler put oil through the strait at 2.9 million barrels on October 11, the lowest day of the month, and the seven-day average to October 13 at 11.6 million barrels per day, about 68 percent of its pre-war baseline. UKMTO describes traffic as roughly 70 percent below pre-war levels, with most of the ships still moving being dry bulk carriers rather than tankers. CENTCOM says 400 ships and 100 million barrels moved through in the same week, and its commander, Admiral Brad Cooper, insisted on October 16 that “the Strait of Hormuz is controlled by the United States and our regional partners, not Iran,” attributing the attacks to IRGC “desperation.” Both statements can be true at once: oil is moving, under escort, through a shooting gallery. Lloyd’s List’s editor in chief, Richard Meade, put it to CNBC this way: “This is not a sustainable new normal.”
Diplomatically, nothing has moved since July. Iran’s parliament speaker, Mohammad Bagher Ghalibaf, said on October 4 that the strait would stay closed until the US met seven Iranian conditions. The US blockade of Iranian ports remains in force; Iran has not loaded any crude for export since late August.
So the bottleneck has been tested, and the results are in. The pipelines helped and were bombed. The strategic reserves bought time and are now well into their drawdown. The escorts moved oil and did not bring down insurance. The importers with the deepest stockpiles and the most diversified routes came through better than those without. What the crisis has not produced is an answer to the question the old consensus never had to confront: what happens when the country beside the strait decides that the cost of closing it is worth paying. Back in April, the US ambassador to the United Nations, Mike Waltz, told the Security Council that the strait “is not Iran’s hostage.” Seven and a half months in, it reads as an aspiration rather than a description of events.