Strait of Hormuz remains mostly closed despite truce, causing refinery losses

On August 16, three ships crossed the Strait of Hormuz. Before February, dozens made the run every day; the waterway alone carried about one-fifth of the world's crude before the war.

Washington and Tehran agreed a truce and trade terms through intermediaries, yet the pipe stays shut six months on. President Trump insists the strait is open and that no talks with Iran are underway, but US News and World Report noted on August 18 that the ships tell a different story. The truce stopped the shooting between states without reopening the waterway either side actually needs.

The counts since tell a strait running at a trickle: twelve crossings on August 17, ten on August 18, according to MarineTraffic data cited by The Financial Express in August 2026. Weekly traffic is down roughly nineteen percent after fresh attacks on tankers, and the daily count fell from a post-war high of nineteen on August 11 to three by August 16, according to Moneycontrol on august 19.

Crude exports from Saudi Arabia, Iraq, the UAE, Kuwait, Oman, Qatar and Bahrain combined ran near two-point-nine-five million barrels per day in early August, against roughly twenty million barrels per day of Gulf export capacity before the war, Oil & Gas Middle East reported, citing export tracking for the week of August 3. Refiners are not waiting for the politicians.

The actors want incompatible things. Iran's objective, per its own statements catalogued by the Institute for the Study of War, is to secure recognition of its control over Hormuz and to wear down American willingness to keep fighting, according to ISW Iran Update on august 21. Keeping traffic thin serves that aim even under a ceasefire; every insurer that pulls cover does Tehran's blockade work for free.

Washington wants the strait declared open more than it wants it used, because the optics of an open chokepoint are worth something in negotiations even when hull owners disagree.

The Gulf producers, above all Saudi Arabia and the UAE, want their export terminals earning again and have begun routing what they can through pipelines to Omani waters that bypass the strait entirely. The Financial Express reported in August 2026 that this shift explains why Bab el-Mandeb and Omani terminals recorded far heavier traffic than Hormuz itself last week. Shipowners want war-risk premiums they can survive. Refiners just want crude.

The trigger this month was the renewed attacks. On August 8 the UAE accused Iran of hitting a tanker owned by the Abu Dhabi National Oil Company with a missile as it tried to pass through the strait, according to Al Jazeera on august 20. After that, insurers repriced and captains slowed down; the UK Maritime Trade Operations centre logged only nine oil tankers passing in both directions over seventy-two hours earlier in the month, UKMTO data via Ajel English showed on August 11.

But the slow pressure underneath predates any single hull being hit. Since the war began in late February, Asia's refineries have lost access to the medium-sour grades most of them were designed around, forcing light sweet crude to a record share of the region's crude diet and cutting into diesel and jet output, Reuters reported on April 24. The truce did not fix that; it merely paused the worsening.

From 1984 to 1988, Iraq and Iran attacked each other's tankers in the same waters in what became the Tanker War, and traffic kept flowing anyway, because the United States reflagged Kuwaiti hulls and escorted convoys under Operation Earnest Will. Insurance stayed expensive but available. Neither side managed to starve world markets. The lesson of that decade was that a convoy regime can hold a chokepoint open if a great power will put warships next to merchantmen.

A changing risk calculus

The counter-example is recent. In September 2019, a drone-and-missile strike knocked out half of Saudi Aramco's output at Abqaiq in a single night, and the price spike lasted weeks, not months, because spare capacity and strategic stocks covered the loss. This time there is no quick cover: the strait itself is contested, not one processing plant, and the disruption has already run for six months. What is different in 2026 is duration.

Inventories that absorbed a two-week shock cannot absorb a two-quarter one, and the International Energy Agency reported Atlantic Basin refining margins at all-time highs in July as diesel, jet fuel and gasoline cracks surged on depleted product stocks, according to IEA Oil Market Report on august 12. The 1980s model needs an escort fleet and a political decision; nobody has made either yet.

The supply scramble

First, refiners bid for whatever crude can still reach them, so Atlantic-basin grades command a premium while Gulf barrels rot at anchorage.

Plants configured for medium sour crude yield less diesel when forced onto lighter grades, and diesel is exactly what the world is short. Bloomberg via Yahoo Finance noted on August 18 that the American diesel crack spread, the margin a refiner earns turning crude into diesel, settled above one hundred dollars a barrel for the first time on record this week.

That cost lands at the pump and in freight rates everywhere diesel moves trucks, harvests and ships.

Who pays? Motorists and airlines pay first, then industrial users of distillate, then the Asian economies that import most of their crude, with India most exposed since roughly half its energy passes the strait, according to Moneycontrol on august 19. Who profits? Refiners with flexible configurations and access to Atlantic crude are printing margins, and tanker owners whose vessels can clear war-risk cover earn multiples of peacetime rates on the few transits that happen.

The producers losing export revenue, Saudi Arabia chief among them, are also the ones funding the security response. The party paying for the blockade funds both the problem and the attempted solution.

The next confirmation

The observable sequence if this read holds. Transit counts stay in single digits or low teens through September, diesel cracks stay elevated above historical norms even if crude prices stall, and Asian refiners announce further run cuts rather than chase unaffordable Gulf cargoes. Watch the insurance market more than the negotiations; when Lloyd's war-risk committees reprice Hormuz cover downward for consecutive weeks, the reopening is real. If talks produce a verified escort or de-mining regime, transits should jump within days, because owners have been queuing to move cargo the whole time.

What breaks the read is simple. A durable settlement that reopens the strait, floods Asia with medium-sour crude again, and collapses those hundred-dollar diesel margins within a quarter. The opposite of my claim would be that the truce genuinely restored flows. The tracker data says otherwise this week.

Six months of a closed strait have taught the market that ceasefires are documents and blockades are facts, and the machines that turn crude into diesel answer to facts.