Riyadh has its volumes back; Asian refining margins now set the price

Noise and signal

The market's headline is price. According to CNBC, ICE Brent settled at 98.32 dollars on 6 November, down more than 16% on the week, while Rapidan Energy puts the odds of renewed conflict at 80%. Over the same days the IRGC claimed mine strikes on five tankers and a tug on 5 November and on two tankers on 6 November. Reuters reported that maritime authorities had verified none of them. Both are noise: one overstates peace, the other war.

The quiet parameter is Aramco's official selling price (OSP), the premium or discount to a benchmark that the producer announces each month. Arab Light's Asian price fell to 2 dollars below Oman/Dubai in October, 5 dollars in November and 6.50 dollars for December. A Reuters survey had expected a December cut of 0–2 dollars, and Aramco chose the deep end. Adding 2 dollars to the November discount should give 7 dollars, yet the published figure is 6.50 dollars. The original price document could not be opened, so the gap remains unverified.

Supply is back and the constraint has changed hands

Reuters attributes the cut to ample Middle East supply: spot premiums for benchmark grades returned to pre-war levels that week. HSBC raised its forecast for Saudi crude output in the fourth quarter from 6.3 million to 8.3 million barrels a day, and for 2027 from 8.8 million to 9.8 million. It expects a return to about 10 million barrels a day by mid-2027. The extra 2 million barrels are now on their way; the question is who buys them, and at what price.

Asian refining margins provide the answer. According to a report carried by BigGo, narrowing Asian margins made buyers cautious and Aramco prioritised reviving demand. In the same release, prices for north-west Europe and the Mediterranean fell by 1 dollar while the US price was unchanged. Riyadh is pricing region by region, and giving its steepest cut to Asia, where losing market share would cost it most.

Insurance sets the floor on delivered costs

The constraint has not left the strait entirely; it has become a cost line. A JMIC update cited by Gulf News counted four attacks in 96 hours, all off the Musandam coast between 1 and 3 November. Brokers told the Financial Times that in early October the additional war premium for a tanker entering the Gulf was 6–10% of hull value, up to 20 million dollars for a single supertanker voyage. The pre-war rate was about 0.25%.

Freight pressure is easing, but the floor is hard. According to Breakwave, the number of empty VLCCs heading for the Gulf rose to 87 on 6 November. The Gulf of Oman–China rate fell from 841 to 776 Worldscale points in a week. Breakwave calculates that if 10 of those 87 ballasters pulled out over security reports, the surplus would vanish entirely. Aramco's 6.50 dollar discount works as a rebate to buyers for the war-premium share of their delivered cost.

Second-round effects and Türkiye

Expensive freight is creating winners and losers outside the Gulf. Reuters reported on 6 November that crude freight from the US Gulf Coast to Asia had risen to 30–35 dollars a barrel, against about 5 dollars a year earlier. Delia He of Arrow Shipping says every extra dollar of freight has widened diesel margins by at least 8 dollars. Economies dependent on imported diesel are paying the difference at the pump.

For Türkiye the direct channel is the Mediterranean price. Aramco cut the price of all Saudi grades bound for the Mediterranean by 1 dollar for December, modestly lowering input costs for Turkish refiners running Saudi crude. The indirect channel is diesel: as freight-driven diesel margins widen, Türkiye's imported diesel bill stays high regardless of the crude price.

Probabilities and the falsifier

The desk's base case, at 50%, is that intra-Gulf price competition continues into January. We put 30% on the discount settling at 6.50 dollars and 20% on a verified escalation cutting supply again. The development that would falsify this thesis is Aramco narrowing its Asian discount by more than 1 dollar when it announces January prices in early December. For the insurance lens, the falsifier is the war premium falling below 2% of hull value. In that case the constraint should be read from price rather than margin.