Saudi Ship-to-Ship Oil Swap: 9M Barrels Rerouted via Hormuz

For logistics and freight planners, the Middle East crude corridor is being redrawn in real time. Saudi Arabia — the world's top exporter — is now offering barrels loaded via ship-to-ship transfer off Sohar, Oman, a clear operational pivot away from the Houthi-threatened Red Sea lane and through the Strait of Hormuz. With satellite imagery showing at least 9 million barrels of loading capacity at Ras Tanura in a single week, the scale of the rerouting has direct implications for tanker availability, lightering capacity, and freight economics.

Saudi Arabia has begun offering cargoes of its heaviest, most sulfur-rich crude grades for loading off the coast of Oman — specifically from ship-to-ship transfer zones near Sohar in the Gulf of Oman — according to people familiar with the matter. The move, first reported by Bloomberg on August 17 and elaborated by gCaptain a day later, is the strongest signal yet that state-owned Saudi Aramco is following the United Arab Emirates in shuttling crude out of the Persian Gulf rather than relying solely on direct loadings at its own terminals. Because the grades being marketed are Arab Medium and Arab Heavy, traders say the barrels almost certainly originated inside the Persian Gulf, meaning they were moved through the Strait of Hormuz before being offered to buyers on the Oman side.

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Saudi Arabia — the world's top exporter — is now offering barrels loaded via ship-to-ship transfer off Sohar, Oman, a clear operational pivot away from the Houthi-threatened Red Sea lane and through the Strait of Hormuz.

The strategic backdrop is a rapidly deteriorating security environment on Saudi Arabia's alternative export route. For years the kingdom has had the option to divert exports to its Red Sea terminal at Yanbu, reducing dependence on Hormuz, through which roughly a fifth of global oil supply transits. That redundancy has now been compromised: Yemen's Houthi militants, aligned with Iran, declared a maritime blockade on Saudi Arabia in recent weeks and have carried out missile and drone strikes on Saudi-linked tankers, including an attack reported off Aden on July 23. With the Red Sea corridor no longer a safe fallback, Aramco appears to be leaning harder on the Gulf route — and using ship-to-ship transfers to decouple loadings from its own jetties.

The scale of the pivot is visible in satellite data. Vessels with at least 9 million barrels of combined transport capacity loaded at or near the Ras Tanura export complex over the past week, and Saudi Arabia has amassed a cluster of supertankers just outside the Gulf. That pattern is consistent with a shuttle-and-lightering operation: very large crude carriers load in the Persian Gulf, transit Hormuz, and then transfer cargo to other tankers at designated offshore zones before onward delivery. Aramco's trading arm first experimented with this shuttling model in May, and the latest offers — so far directed only at a handful of Chinese refiners — suggest the practice is being scaled selectively.

For buyers, the offer is tailored rather than generic. Chinese refiners are the natural first counterparties because their complex, high-conversion plants are built to process heavier, more sour grades like Arab Medium and Arab Heavy. Offering these barrels from Sohar gives those refiners continued access to preferred feedstock while shifting some of the Hormuz transit and security burden onto the seller's logistics network. Commercial terms will matter: ship-to-ship transfers add lightering fees, demurrage and scheduling risk, and buyers will weigh whether any discount compensates for the operational complexity versus direct-loading alternatives from other Middle Eastern producers.