The Ledger Letter
Finance Studio Advisors · November 6, 2026
 

The Barrels Did Not Vanish in September. They Moved Onto Ships.

Brent is near $98 and down about 13% on the week, with Reuters counting at least five vessel incidents in the Persian Gulf since Sunday. Observed global stocks fell only about 10 million barrels in September. Onshore inventories fell 113 million. Oil on water rose 103 million.
 
The Breakdown
Today’s disagreement: JP Morgan reads September and October as a surplus of 1.1 and 1.4 million barrels a day; Goldman Sachs reads the same two months as balanced.
 
01
The loud fact
Brent is trading near $98 and WTI near $91, both down roughly 13% since Monday, in a week when Reuters counted at least five vessel incidents in the Persian Gulf.
02
The quiet fact
Global observed stocks fell about 10 million barrels in September. Onshore inventories dropped 113 million while oil on water rose 103 million. Almost the whole draw was a change of address.
03
The anchor
The IEA’s October report puts 2026 supply at 100.7 million barrels a day, down 5.8 on the year, and demand at 102.4 million, down 2.6. The year is short. The month is long.
A barrel can change address without changing hands. So can the money a saver thinks is sitting still.
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By the Numbers
Brent, FridayAbout $98 a barrel, down roughly 13% on the week
WTI, FridayAbout $91 a barrel
Onshore stocks, SeptemberDown 113 million barrels
Oil on water, SeptemberUp 103 million barrels
IEA 2026 balanceSupply 100.7, demand 102.4 million barrels a day
Prices as quoted on Friday morning. Inventory movements and the surplus estimates are JP Morgan figures reported on November 4. The annual balance is the International Energy Agency’s October Oil Market Report, published October 15. Vessel incidents as counted by Reuters since Sunday, November 1.

A Glut That Floats

What the Week Did

Brent is near $98 and WTI near $91, both down about 13% since Monday. That happened in a week when Reuters counted at least five vessel incidents in the Persian Gulf and fresh attacks were reported in the Strait of Hormuz.

Nothing came off the market. A price that falls 13% through a week of attacks on tankers is not responding to supply at all.

ING’s commodity desk put the mechanism plainly in a note on Thursday: in the absence of escalation, the oil market is likely to continue to slowly give back the risk premium. The premium is the part of the price that was never a barrel.

Where the Barrels Went

September is the month to look at. Global observed inventories fell about 10 million barrels, which reads like a tight market until the line is split. Onshore stocks fell 113 million barrels. Oil on water rose 103 million.

A glossary note. Observed inventory counts tank farms and floating storage together. Onshore barrels have an owner and a buyer. Barrels at sea are often still looking for one, which is why a fleet filling up usually means cargoes are not clearing.

The level is still low by the standards of this year. End-September observed inventories sat 509 million barrels below where they were at the end of February. The direction and the level are telling two different stories, and the direction is the newer one.

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Why Two Desks Disagree

JP Morgan has the market back in surplus at 1.1 million barrels a day in September and 1.4 million in October. Goldman Sachs looked at the same two months and called them balanced. Both have the same data.

The gap is a demand assumption. JP Morgan reckons global oil demand has fallen 3.3 million barrels a day since the conflict began in late February, which is demand destruction rather than a cycle. Price that high for that long stops being a transfer and starts being a deterrent.

Supply has meanwhile come most of the way back. Vortexa puts Hormuz flows at 14 million barrels a day including condensates, about 86% of pre-war levels. Latin American production is running about 1.5 million barrels a day above last year, and global crude imports have reached 44.9 million, up 1.3 million. If the barrels return and the buyers do not, a surplus is arithmetic.

When the ledger and the warehouse stop agreeing, the argument usually ends up being about what the ledger says a thing is worth.
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What Settles It

Our read is that the floating build is the number that matters, because it is the one that cannot be explained by a risk premium unwinding.

The check is published monthly. Another month of oil on water rising while onshore stocks fall would confirm the glut is real and simply offshore, and would make Goldman’s balanced call the one that ages badly.

We would be wrong if November shows floating storage drawing down while onshore builds, which would mean the cargoes found buyers and September was congestion rather than surplus.

A barrel at sea is still a barrel. It has only put off deciding whose problem it is.

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