Why Is the Strait of Hormuz Crisis Moving Markets?

The US and Iran have been at war since February 2026, and the recurring closure of the Strait of Hormuz — the narrow channel between Iran and Oman that normally carries roughly a fifth of the world's oil — has made it the largest single oil-supply disruption on record. The scale is not rhetorical: at the war's peak, nearly all shipping traffic through the Strait stopped, and multiple countries outside the immediate region, including the Philippines, declared national energy emergencies.

Oil prices have moved with the fighting rather than settling into a new range. Brent crude surged past $114.00 a barrel in March 2026 as Iran struck Gulf energy infrastructure, including Qatar's Ras Laffan LNG facility, and peaked at $118.35 on March 31. An April ceasefire brought prices back down — Brent traded at $71.57 on July 1 — but the ceasefire collapsed in early-to-mid July, fighting resumed, and Brent climbed back to nearly $97 by July 24 as US and Iranian forces exchanged strikes and Iran again restricted the Strait.

The conflict crossed from an economic story into a human one on July 18, 2026, when Iranian ballistic missiles struck Muwaffaq Salti Air Base in Jordan, which hosts US troops and aircraft. Two US service members were killed and a third was initially reported missing — the war's first confirmed American combat deaths — and the US military launched a fresh, multi-hour wave of strikes on Iranian military, air-defense, and coastal targets in response. Nightly US strikes on Iran continued for an extended stretch afterward as the two sides settled into a grinding exchange rather than a quick resolution.

Where things stand — updated August 11, 2026

• August 11: A US military helicopter fired on the rudder of the Panama-flagged cargo vessel Vela Nova in the Gulf of Oman after its crew ignored warnings — the third vessel US forces have disabled since Washington reimposed its naval blockade of Iranian ports on July 14. The missile strike caused a fire that was extinguished; all 17 crew were accounted for. The blockade is now being enforced with live fire against commercial shipping, not just patrols.
• August 11: An adviser to Iran's Supreme Leader, Mokhber, said the Strait of Hormuz will not be reopened until Iran's conditions are met, and another senior figure, Rezai, said any Iran-Oman agreement on a shipping corridor would be separate from the question of the closure itself — a reminder that the corridor under negotiation is a workaround, not a reopening.
• August 11: The US Energy Information Administration said it expects Middle East crude output disruptions of roughly 600,000 barrels per day to persist until the end of 2027 — the first official US forecast extending the disruption into a second year. At the same time, US Energy Secretary Wright said the seven-day average of oil leaving the Strait has recovered to almost 9 million barrels per day, evidence the blockade-and-corridor regime is letting some trade flow even with the Strait formally closed.

The diplomatic track has moved further than it had a week earlier. Iran and Oman agreed on the geographic coordinates of a temporary shipping corridor, with inbound and outbound routes running partly through Iranian waters — a real departure from the decades-old arrangement in which transiting traffic used Omani waters — and as of August 7, 2026, a joint statement between Tehran and Muscat is under review and in final drafting, according to Iranian officials; Qatar's foreign ministry described the negotiations as being in an advanced stage on August 11. But the terms coming into focus are more limited than a full reopening: Iran's deputy foreign minister said the arrangement would be a temporary route lasting two to four months, not a resumption of normal transit. Washington has not signed off on the plan and has kept a naval presence in the Strait.

The shooting has not stopped while the diplomacy proceeds. Iran struck a tanker owned by UAE state oil company ADNOC with a missile on August 8, 2026, while the vessel was transiting the Strait — the 16th attack on an ADNOC vessel since the war began on February 28, 2026. No injuries were reported in this specific strike, and ADNOC said the situation was brought under control, but the UAE Foreign Ministry called it a "flagrant violation" of the UN Security Council resolution protecting freedom of navigation, and both Qatar and the Gulf Cooperation Council's Secretary-General condemned the attack. The pattern — sixteen attacks on one company's vessels alone since February — is the practical reason a draft shipping-corridor agreement and an actually safe waterway remain two different things.

The war has reached markets well beyond oil. Renewed fighting has repeatedly been cited alongside tariffs as a driver pushing US Treasury yields toward their highest levels of 2026, and Federal Reserve officials — under new Chair Kevin Warsh, confirmed by the Senate in a 54-45 vote in May 2026 to succeed Jerome Powell — have pointed to the war as one source of persistent inflation pressure complicating the case for cutting interest rates. That combination of a live geopolitical shock and a data-dependent Fed is why the Strait of Hormuz situation keeps showing up across oil, bonds, and rate-hike odds at once, rather than staying contained to energy markets.