Gulf Oil Through Hormuz at 13.2 Million Barrels a Day, Iran's Crude at Sea Down to 15 Million
Gulf exports are back to three-quarters of normal. The oil Iran can still sell has halved since August, and Tehran has said what follows when it runs out.
WEDNESDAY, SEPTEMBER 30, 2026 · DAY 215
Live data this morning. Prices are Tuesday settles and closes; strait flow is Kpler's seven-day average and Windward's counts through September 28. No weekly count of non-Iran-linked transits was available this session.
Executive Summary
The Gulf's oil is flowing again; Iran's is running out.
Kpler puts the seven-day flow of oil and fuel through Hormuz at 13.2 million barrels a day, 77% of pre-war, while Iran's unsold crude parked at sea outside the US blockade has fallen from about 29 million barrels in early August to about 15 million.
Expect the recovery to stall below 15 million barrels a day before the November 3 election, as Tehran's pressure moves from the ships to the terminals that load them.
If Kpler's seven-day Hormuz flow reaches 15 million barrels a day before November 3, this read is wrong.
The Lede
One side refills. The other drains.
What is the divergence
The Gulf producers and Iran are moving in opposite directions through the same water. Under daylight US escort, Gulf barrels have climbed back to three-quarters of their pre-war volume. Iran, blockaded since July 14, is selling down the crude it put to sea before the cordon closed, and it has no way to refill it.
What number proves it
13.2 million barrels a day against 15 million barrels in total. The first is Kpler's seven-day Hormuz average to September 28, reported by CNBC and matched by the 13.1 million Kpler gave CNN for last week, against a pre-war 17.1. The second is Kpler's count of Iranian crude afloat outside the blockade, down from about 29 million in early August and in line with the 15 million Treasury Secretary Bessent cited on Sunday.
13.2 mb/d
Oil and fuel through Hormuz, Kpler seven-day average. 77% of pre-war 17.1.
~15 mb
Iranian crude afloat outside the blockade, Kpler. About 29 mb in early August.
17
Crossings on Sep 28, Windward. Eleven inbound. Volume rides on a few large hulls.
What node breaks the equilibrium
That 15-million-barrel stock. On Tuesday, Parliament Speaker Ghalibaf, Iran's chief negotiator, restated Tehran's rule: where Iran cannot sell oil, no one will. Today it still sells, from storage. The drawdown since August, about 14 million barrels in eight weeks, empties the stock around late November; Bessent's two-week shipping estimate empties it by mid-October. Either date lands on Tehran's own stated trigger.
Iran has published its own trigger. When its last crude at sea is sold, it says no one else will sell either.
The One Chart
The Gulf's flow is refilling; Iran's saleable crude is draining.
Tanker Flow
Barrels back, hulls not
Metric
Last 24 hours
Pre-crisis baseline
% of normal
Vessels transited (all types)
17 crossings on Sep 28 (11 in, 6 out; 6 dark). Windward [unverified, single source]
~85/day
20%
Estimated crude throughput
~8.9 mb/d crude outbound, Sep 25–27 average (26.6 mb in three days). Windward [unverified, single source]
~15–20 mb/d
44–59%
7-day rolling average
13.2 mb/d oil and fuel, seven days to Sep 28. Kpler [verified]
17.1 mb/d (Kpler, pre-war)
77%
A crossing is motion, not volume. The two rows beneath it carry barrels.
Seventeen crossings, eleven inbound, still moved about 8.9 million barrels of crude a day: the outbound hulls were Saudi-loaded supertankers, and the ship-to-ship share fell to 28% from two-thirds. The gap is closing from one side only: flow rose to 13.2 million barrels a day while Washington says Iran's own exports under blockade are zero. The curve has priced the recovery, with expiring November Brent down 2.6% to $102.59 and December near $96, while stocks traded the thirty-year Treasury rather than the tanker count.
Clearing each barrel still costs $30 to $40 before the Navy's share, by analyst Rory Johnston's estimate; the running cost of the conflict itself, ledger by ledger, is at warometer.com.
Top Stories
The reserve's last forty million barrels
What happenedThe Energy Department offered up to 40 million barrels on Tuesday, the final tranche of the 172 million the US pledged to the coordinated international release, with bids due October 6. The reserve held 283.8 million barrels, its lowest since late 1982.
Why it mattersThe sale leaves about 244 million barrels, under the 252.4 million line below which federal law allows only emergency drawdowns, and Energy Secretary Wright has signalled no further release. The buffer is spent before Ghalibaf's threat is tested, not after it.
Hidden driverThe release runs on the November 3 clock; the next lever is diesel exports, where Goldman estimates a ban cuts US prices about 4% and raises Europe's, and Wright prefers voluntary curbs.
The long bond ignores the oil price
What happenedBrent fell 2.6% on Tuesday and the thirty-year Treasury still reached 5.62%, its highest since 2002; the ten-year touched 5.29% and closed at 5.26%. The S&P 500 slipped 0.17% to 7,670.84 and the Nasdaq 0.09% to 26,797.54 as August job openings printed 7.1 million.
Why it mattersCheaper crude is not buying cheaper money. One futures tally puts the odds of a hold on October 28 near 30%.
Hidden driverSchwab notes the term premium has barely moved: the long end is pricing the Fed's path against $6.45 diesel, not war risk, so a strait deal alone would not pull yields down.
Qatar carries paper; Treasury carries sanctions
What happenedQatar said on Tuesday it is meeting both sides. Tehran awaits Washington's answer to the seven-day reopening plan Trump rejected on Saturday; Trump says he has offered "nothing." The same day, Treasury designated people and firms it accuses of financing Iran's military supply chain.
Why it mattersWashington is running attrition: flow up, blockade on, finance squeezed. Attrition works only while Iran still has something to sell.
Hidden driverBoth calendars point past the election: the Wall Street Journal reported last week that strikes are pencilled in for after November 3, and Iran's crude at sea runs down on roughly the same clock.
The Bet
If both lines hold, Gulf flow grinds toward 14 million barrels a day while Iran's crude at sea approaches zero somewhere between mid-October and late November. That is the shortest runway in this crisis, and it ends near the election.
The second-order effect moves war risk from the transit to the berth: insurers who have learned to price an escorted crossing start pricing Ras Tanura and Fujairah, and flow stops climbing short of normal. This is the 1984 logic of the Tanker War, when the side with nothing left to export struck the side still exporting.
If Kpler's seven-day Hormuz flow reaches 15.0 million barrels a day before November 3, this read is refuted.
A blockade that works on the water moves the war to the berth.
Live Book
Two new calls, two misses
Standing falsifier, restated verbatim: weekly non-Iran-linked transits above 90 — pre-crisis normal — with shooting ongoing and no transit agreement in force. That observation would establish that declared authority, naval escort and insurance backstop are together sufficient to move commercial hulls through a live conflict, which is precisely what this brief’s framework denies.
Issued
Call
Refuted if
Resolves by
Status
Standing
Declared authority, escort and insurance cannot together move commercial hulls through a live conflict
weekly non-Iran-linked transits above 90 — pre-crisis normal — with shooting ongoing and no transit agreement in force
Standing
Under review since Sep 24: Lloyd's List's 97 for Sep 7–13 reads above the literal threshold; Windward's all-vessel count for Sep 16–23 was 55. Ruling prints dated on Desk.
Sep 30
Gulf flow through Hormuz stalls below 15 mb/d before the election
Kpler seven-day average at or above 15.0 mb/d
Nov 3
Open
Sep 30
Iran or an aligned force strikes a Gulf Arab crude export terminal or loading berth
No strike with damage confirmed by the operator or a government
Oct 21
Open
Sep 29
Hormuz clearance stays under 70% of pre-war
Any Kpler daily clearance at or above 12.0 mb/d
Oct 14
Refuted. Wrong on the day of issue: Kpler's seven-day average already stood at 13.2 mb/d, 77%. The desk read one day's print as the trend.
Sep 16
No laden Saudi crude departure from Yanbu
Kpler-observed laden departure
Sep 30
Refuted. Kpler: 12.5 mb loaded onto nine tankers at Yanbu, Sep 26–28.
Sep 24
Another vessel struck in Hormuz or the Gulf of Oman
No strike reported
Oct 1
Open. No qualifying strike on file since Sep 24.
Sep 27
November–December Brent spread above $4 every settle to expiry
Any settle at or below $4
Sep 30
Open. About $6.60 on Sep 29; resolves at today's settle.
Sep 25
Brent settles at or above $100 every session
Any settle below $100
Oct 2
Open. $102.59 on Sep 29. At risk: the front month rolls to December, which settled near $96.
Since the ledger opened: 117 issued · 20 confirmed · 14 refuted · 83 open. Calls whose windows close at today's settle resolve in tomorrow's book. Full book →
Full desk copy — matrix, regional lens, and the complete book → ai2signal.com/desk
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warometer.com — the live, self-auditing cost of the current conflict.