Key Takeaways:
Renewed attacks on commercial tankers in the Strait of Hormuz have cut Gulf oil exports by roughly 68% to 4.8 million barrels a day, the lowest since hostilities began in early 2026.
"The loading pace has started to roll over," said Rory Johnston, founder of Commodity Context. "We had a really promising trajectory, and it collapsed almost as quickly."
Satellite imagery reviewed by Bloomberg shows daily tanker transits fell to 13-15 vessels from a pre-conflict baseline of about 125, an 89% reduction. At least nine commercial ships, including five very large crude carriers, have been damaged since a 60-day ceasefire collapsed in early July. The International Maritime Organization formally declared conditions in the strait too hazardous for normal commercial navigation.
Brent crude has climbed above $90 a barrel, up more than 15% since late February, as the disruption removes roughly 10 million barrels a day of accessible supply from global markets. Qatar's force majeure on LNG shipments adds a separate gas-market shock, with Asian spot prices rising sharply.
The Geography of Vulnerability
The Strait of Hormuz, just 33 kilometers at its narrowest navigable width, carries about 20% of the world's daily oil supply under normal conditions. No combination of alternative routes can fully compensate for its sustained closure. Saudi Arabia can divert a portion of crude through Red Sea pipeline infrastructure, but satellite data showed as few as one tanker berthed at the kingdom's principal Gulf export facility in recent days. Iraq, which relies almost entirely on the Basra Oil Terminal, has no meaningful alternative and has been forced to curtail upstream production as export storage fills.
The asymmetry of the disruption is striking. Iranian crude exports have continued at near-normal volumes through a shadow fleet operating outside conventional tracking and insurance frameworks, while neighboring producers with no involvement in the conflict bear the bulk of the export revenue damage. Iran's military has threatened to target "all infrastructure in the region" if the United States follows through on President Trump's threats to attack Iranian civilian infrastructure.
Insurance and the Hidden Multiplier
War risk insurance premiums for Hormuz transit have escalated to levels that make many voyages economically unviable, effectively removing vessels from the available fleet without physical damage. Underwriters are applying probability-weighted loss expectations that incorporate the current IMO advisory, creating a structural floor on how quickly export volumes can recover even if hostilities were to cease. Insurance market normalization has historically lagged physical security improvements by weeks to months in analogous disruption events, meaning the effective duration of export constraint may extend well beyond any ceasefire agreement.
India, the world's third-largest supplier of seafarers, has advised shipowners not to deploy Indian crew on vessels transiting the strait after two Indian seafarers were killed in attacks. The directive further tightens the available labor pool for Hormuz voyages.
The last comparable disruption — the 2019 Gulf of Oman incidents — involved neither the duration nor the magnitude of the current crisis. During the 1980s Tanker War, producer infrastructure adaptation to alternative routing took months to years to develop at scale. Strategic Petroleum Reserve releases from the United States and IEA member nations provide a short-term buffer but cannot substitute for the restoration of sustained supply flows.
This article is for informational purposes only and does not constitute investment advice.
