Are LME warehouse stocks all the aluminum in the world?

No. The 246,925 tonnes in LME sheds is roughly one day of global primary aluminum consumption. It excludes China's separate SHFE warehouse system, producer and consumer inventory, and metal in transit. The LME pool matters because it is the market of last resort: it is where a short position goes to find metal, so its level sets the tone for spreads and premiums even though it is a sliver of world stock.

Why is the aluminum price falling if LME stocks are at a record low?

Because price follows expected availability, not the warehouse count. LME cash aluminum fell about 15 percent from June 1 to August 18, 2026 while stocks set record lows, and the cash to three month spread relaxed from 110 dollars of backwardation to a small contango. That combination says traders expect metal to arrive, from producer stock, off market inventory, or restarting Gulf capacity, before the visible pool actually runs out. Whether they are right is the open question this article pre registers.

What is off warrant stock and why does it matter here?

Off warrant metal sits in LME registered warehouses without a warrant attached, reported to the exchange on a daily file with a three day lag. When exchange stocks move violently, off warrant data shows whether metal really left or just changed paperwork. In July 2026 that test showed lead rotating back off warrant. Run on aluminum, it shows the opposite: off warrant fell 19.7 percent from June 1 to August 13, alongside the exchange drain, so the aluminum is genuinely leaving the reportable system.

Did the Middle East attacks cause the LME aluminum drain?

Not on their own. The late March 2026 attacks on Gulf smelters plausibly accelerated the drain: March and April were the heaviest months, near 49,000 tonnes each. But the buildless streak began February 2, seven weeks before the attacks, and February alone drained over 30,000 tonnes. Whatever started the drain was already running before the missiles, which the attack centered telling leaves unexplained.

Research

LME Aluminum Stocks at a 19 Year Low, Fact Checked

138 Sessions Without a Build, and This Time the Metal Is Not Hiding Off Warrant

Published August 19, 2026 · By the ByShovel Research Desk

Reuters called it the lowest this century and pointed at the Gulf. Our own capture shows the bleed started seven weeks before the missiles, has not printed a single daily build since February 2, and, unlike July's lead episode, is not rotating into off warrant sheds. Meanwhile the curve stopped worrying, which is the part that deserves an explanation.

What we checked

Claim checked: Reuters reported on July 27, 2026 that LME aluminium stocks had fallen to their lowest this century, and attributed the drain to Iranian attacks on two Gulf smelters in late March and disruption in the Strait of Hormuz.
Archive window: The Vault Report's daily LME stocks capture, 4,711 aluminum sessions from January 2, 2008 to August 18, 2026, plus the LME's daily off warrant reports from June 1 to August 13, 2026 and our own price capture from March 2026.
Documents examined: A full history scan of our own LME stocks table, checked against a fresh pull of the live source at write time (it matched to the tonne), and 54 archived LME daily off warrant stock reports, each checksummed against its own global total row.
Result: The low is verified (246,925 tonnes on August 18, the smallest in the archive, with no daily build in 138 sessions since February 2), but the Gulf timeline is not: the drain began seven weeks before the attacks, and off warrant aluminum fell 19.7 percent alongside it, so the metal is leaving the reportable system rather than hiding off warrant. Verdict update September 30, on the page.
Sources: Reuters: LME aluminium stocks fall to lowest this century (July 27, 2026, via Mining Weekly)
ts2.tech: Aluminium's 36 year inventory low hides a 2 million ton supply risk (August 2026)
AlCircle: LME aluminium stocks hit the lowest level this century amid Middle East supply constraints (July 2026)
The Vault Report: LME lead's record stock surge, fact checked (August 18, 2026), the companion investigation whose method this piece reuses
LME: Off warrant stock reporting, daily T+3 files
Westmetall: LME aluminium cash settlement and stock table (public mirror of the daily figures)

6 of 7 sources archived with SHA-256 on September 4, 2026 · revision 1

The London Metal Exchange is running out of aluminum to count. The August 18 report shows 246,925 tonnes in the warehouse system, the smallest pile in our archive, which covers every trading session since January 2008, and by Reuters'' longer database the smallest this century. The wire story blames Iranian missiles and the Strait of Hormuz. Our own capture says the drain is stranger than that: it began seven weeks before the attacks, and it has not printed a single daily build since February 2.

What is verified, from our own capture

The Vault Report''s daily LME stocks archive covers 4,711 trading sessions of aluminum data back to January 2, 2008. Every figure below was checked two independent ways for this piece: a full history scan of our own table, then a fresh pull of the live source, which matched the archive to the tonne.

246,925 tonnes is the record low of the archive. The pre 2026 floor was 271,450 tonnes, set August 23, 2022 in the aftermath of the Russian invasion of Ukraine. That floor fell on July 27, 2026, and every session since has set a new one.
Stocks have halved this year. January 2 opened at 509,250 tonnes. The drain is 262,325 tonnes, 51.5 percent, in under eight months. The last 30 days alone took 11.8 percent.
Not one daily build since February 2. 138 consecutive sessions: 128 falls, 10 flats, zero rises. The longest comparable run in the whole archive was 89 sessions, March to July 2016. This streak is more than half again longer than anything aluminum has done in 19 years, and it is still open.

LME ALUMINUM STOCKS, TOTAL TONNES

Weekly closes from The Vault Report''s daily capture, January 2 to August 18, 2026. There is no up week because since February 2 there has been no up day.

The drain predates the missiles

The standard telling, via Reuters on July 27: the Gulf produces about 9 percent of the world''s primary aluminum, two of its big smelters were hit by Iranian attacks in late March, the Strait of Hormuz complicated alumina in and metal out, and LME sheds bled accordingly.

The timeline in our capture does not quite cooperate. The streak started February 2. February alone drained 30,175 tonnes with zero daily builds, all of it before the first missile. March and April were the heaviest months, 48,775 and 49,725 tonnes, which fits the attack story as an accelerant. It does not fit it as a cause. Something was already pulling metal out of the system at a steady, buildless clip for seven weeks before the Gulf became the headline, and the popular version of this story starts the clock too late.

The lead test: is the metal hiding off warrant?

July''s lead episode taught the reflex: when LME headline stocks move violently, read the off warrant reports before believing the move, because metal that leaves the warrant system often just changes paperwork status and stays in the same shed. We ran exactly that test on aluminum, using the same archive of 54 daily LME off warrant files (June 1 to August 13) we built for the lead investigation.

The answer is the opposite of lead. Off warrant aluminum fell too: 107,930 tonnes on June 1 to 86,680 on August 13, down 19.7 percent, while exchange stocks fell 26 percent over the same stretch. The combined reportable pool, exchange plus off warrant, shrank from 445,630 to 336,680 tonnes. That is 108,950 tonnes, a quarter of the visible system, gone in two and a half months. Port Klang, the largest off warrant aluminum point in the reports at the start of the window, fell from 65,093 to 26,130 tonnes.

Honesty requires the lumps: the off warrant series is not a clean slide. A 19,774 tonne batch appeared in the July 17 report, and Rotterdam off warrant grew 14,369 tonnes over the window, so some warrant to shadow rotation exists at the margin. But it absorbs nowhere near the exchange drain. In lead, roughly 73 percent of the exchange drain reappeared off warrant at the same delivery point. In aluminum, off warrant is draining alongside. The metal is leaving the reportable system entirely.

LME OFF WARRANT ALUMINUM, TONNES

Global off warrant aluminum from the LME''s daily reports, June 1 to August 13, 2026, parsed from The Vault Report''s file archive and checksummed against each file''s own global total row.

The part that does not fit: the curve stopped worrying

Our price capture for LME aluminum starts in March 2026, a short window, and we treat it as one. Inside that window the story is clear. The cash to three month spread averaged 55 to 70 dollars of backwardation from March through May and touched 110 dollars on June 1. Since July it has averaged about 7 dollars, and the August 18 report printed a 15 dollar contango, with cash at $3,219 against $3,795 on June 1, down 15 percent.

Read those together. Visible stocks at a multi decade low, falling every single session, and the spread structure relaxed while it happened. A market genuinely scared of running out does not usually let backwardation evaporate into the low. The relaxed curve says traders believe metal exists and will come when called: producer inventory, off market stock the reports cannot see, or Gulf capacity restarting. The stock data says the visible cupboard is nearly bare. One of these signals is going to be proven wrong, and that is the disagreement we are pre registering.

Pre registered August 19, 2026: if the scarcity is real, the buildless streak continues and backwardation returns as stocks approach operational minimums. If the market is right to relax, the streak breaks with a genuine daily build, off warrant stops draining in the daily reports, and contango holds. If a Gulf restart is the driver, the first builds land at Asian points, Port Klang and Gwangyang first. We will publish the verdict either way, including if the story that dies is ours.

The scoreboard we will check, and when

The streak, daily. One genuine build ends it. The record it would need to beat is already in this article.
The off warrant mirror. We keep capturing the LME''s daily files. Next reading: September 1, with the August month end.
The verdict update. September 30, on this page, in place, dated. The pre registration above is the standard we will be graded against.

Our aluminum page updates daily at thevaultreport.com/lme/aluminum.

Method and receipts

Stock figures are The Vault Report''s own daily capture of LME inventory data (total stocks: open plus cancelled warrants), maintained continuously back to January 2008, 4,711 sessions. For this piece the archive was verified two independent ways: a full history scan, and a fresh pull of the live source at write time, which matched the archive to the tonne. Off warrant figures were parsed from 54 archived copies of the LME''s daily off warrant stock reports, June 1 through August 13, 2026; every daily total was checksummed against the file''s own global total row. Press figures reconcile with our capture: Reuters'' 271,275 tonnes for late July appears in our archive exactly (the LME''s report date convention runs a session behind our capture dates), and Reuters'' cited previous low, from August 2022, is our archive''s 271,450 tonnes on August 23, 2022, also exact. Where we describe the Gulf supply narrative, that is sourced reporting, not our data, and it is flagged as such above.

Sources

Frequently asked questions

Are LME warehouse stocks all the aluminum in the world?: No. The 246,925 tonnes in LME sheds is roughly one day of global primary aluminum consumption. It excludes China's separate SHFE warehouse system, producer and consumer inventory, and metal in transit. The LME pool matters because it is the market of last resort: it is where a short position goes to find metal, so its level sets the tone for spreads and premiums even though it is a sliver of world stock.
Why is the aluminum price falling if LME stocks are at a record low?: Because price follows expected availability, not the warehouse count. LME cash aluminum fell about 15 percent from June 1 to August 18, 2026 while stocks set record lows, and the cash to three month spread relaxed from 110 dollars of backwardation to a small contango. That combination says traders expect metal to arrive, from producer stock, off market inventory, or restarting Gulf capacity, before the visible pool actually runs out. Whether they are right is the open question this article pre registers.