U.S. crude stockpiles grew and Gulf exports ran ahead of last year's pace, yet December Brent rose about 2.3% to near $98.40 after Iran confirmed receiving a U.S. reply. The premium for immediate barrels is near $22.
On the supply numbers alone, Wednesday should have been a soft day for oil.
In the U.S., commercial crude inventories rose by about 922,000 barrels to 427.3 million in the week through Sept. 25, a build where analysts had looked for a draw. Distillate stocks added about 1.4 million barrels. In the Gulf, Goldman Sachs puts last week's crude exports at about 23.3 million barrels a day, edging past the 2025 average of 23.1 million, with Saudi Arabia and the United Arab Emirates each running ahead of their own 2025 pace. That count includes tankers that cross Hormuz with their transponders off.
Diplomacy moved too. Iranian officials said they had received an official U.S. reply, carried by Qatar, to Tehran's latest proposal for ending the war. They did not say what it contained or whether it was a rejection. President Trump denied a report that he was prepared to ease sanctions.
Prices rose anyway. December Brent gained about 2.3% to near $98.40 a barrel, and West Texas Intermediate about 2.2% to around $91.40.
Where the tightness is
The strain is in timing. Brent for October delivery traded near $120, about $21.60 over December, a premium of roughly 22% for barrels available now. A curve that slopes that steeply downward from the front month, known as backwardation, is what a market short of prompt supply looks like, even after monthly export totals have recovered.
Goldman's analysts tie the premium to depleted stockpiles and to the chance that renewed fighting damages energy facilities for longer. Their forecast still has prices easing by year-end, a call they credit to the market's "remarkable adaptation."
Crude is recovering faster than fuel. By Goldman's count, regional exports of diesel and similar products are at about half their 2025 volume.
Pressure on Tehran
Iran's rial fell to a record low beyond 2.5 million per dollar on Tuesday, and 10 people and entities in Iran, Hong Kong and Pakistan were newly sanctioned over weapons procurement.
The observable
The October-to-December spread is the number to watch. If Gulf exports hold above last year's pace and U.S. stocks keep building, a narrowing of that roughly $22 premium would confirm supply is catching up with demand for prompt barrels. If it holds, the binding constraint is inventories and refined fuel rather than crude flows. Bids on an Energy Department exchange of up to 40 million barrels from the Strategic Petroleum Reserve are due Oct. 6, and the content of the U.S. reply to Iran remains the unscheduled catalyst.