The latest London Metal Exchange positioning data arrive at an unusually revealing point for base metals. Copper is still distorted by US tariff-driven inventory flows, aluminium remains constrained by exceptionally thin exchange liquidity, and zinc has reached a four-year high despite a global refined market running in surplus. The standout is zinc: investment funds have built their largest collective bullish position since the LME began publishing its current positioning series in 2018. The common thread is becoming familiar — aggregate supply is increasingly a poor guide to price when metal is concentrated in the wrong geography or unavailable to the exchange.
TL;DR
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LME positioning reports published Tuesday cover positions held at the close on Friday 21 August; the exchange classifies traders as investment firms/credit institutions, investment funds, other financial institutions and commercial undertakings.
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Zinc is the standout: investment funds have accumulated more than 110,000 tonnes of long exposure, the largest collective bullish position in the LME series since 2018.
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Three-month zinc reached $3,858/t, a four-year high, while cash metal traded at a premium of as much as $131/t over three-month delivery.
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That bullish positioning sits against a global refined zinc surplus of roughly 145,000 tonnes in January–May, demonstrating again that aggregate balance and London availability are not the same thing.
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Copper remains distorted by the movement of metal towards the US: COMEX stocks have reached a record 675,185 tonnes, while large LME warrant cancellations are again tightening available London supply.
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Aluminium remains the other major liquidity risk: LME inventories are around 36-year lows and much of the remaining metal is Russian-origin, even as global physical supply begins recovering.
Market Overview
The LME publishes its Commitments of Traders report every Tuesday, reflecting open positions at the close of the previous Friday. Unlike the US CFTC framework, the LME groups participants according to their predominant business activity: investment firms or credit institutions, investment funds, other financial institutions and commercial undertakings.
The latest reports cover positions held on 21 August 2026 and are available for the principal base-metal contracts, including copper, aluminium, zinc, nickel, lead and tin.
The most important signal is not a uniform increase in bullish metals exposure.
It is the extent to which financial positioning is interacting with unusually fragmented physical markets.
That distinction is clearest in zinc.
Zinc: The Positioning Standout
Three-month LME zinc reached $3,858/t on August 25, its highest level in four years. At the same time, the premium for immediately deliverable cash zinc over three-month metal widened as far as $131/t.
Investment funds have accumulated more than 110,000 tonnes of long positions, according to the latest LME positioning data analysed by Reuters. That is the largest collective bullish bet since the exchange began publishing the current series in 2018.
The options market reinforces the signal. Almost 1,500 lots of December open interest sit at a $4,000/t call strike, with another 757 lots at $4,500/t.
At first sight, that degree of bullish positioning looks difficult to reconcile with the fundamental balance.
Global zinc usage increased just 1.5% year-on-year between January and May, while refined output rose 3.5%. The International Lead and Zinc Study Group estimates the refined market accumulated a surplus of roughly 145,000 tonnes over those five months.
But most of the additional refined metal is in China.
Shanghai Futures Exchange inventories have more than doubled since the start of the year to 155,954 tonnes, while total LME zinc stocks, including off-warrant metal, stood at around 124,677 tonnes despite recent inflows.
That geographical split is the trade.
A globally surplus market can still squeeze in London if the surplus tonnes sit behind Chinese borders rather than in an LME warehouse.
China Is Starting to Respond
High London premiums are beginning to do what they are supposed to do: attract physical metal.
Around 17,000 tonnes of zinc have been delivered onto LME warrant since the start of the previous week, stabilising on-warrant inventory around 95,000 tonnes. Off-warrant LME stocks have also risen from a July low of 15,480 tonnes to 29,627 tonnes.
Hong Kong has emerged as the principal conduit, accounting for roughly two-thirds of recent warrant deliveries.
China itself has shifted from its historical position as a substantial refined-zinc importer towards occasional exporter. It was a net exporter again in July by roughly 4,100 tonnes, with exports reaching around 9,200 tonnes.
That is the principal threat to the bullish positioning.
If the LME premium remains sufficiently high, it creates an incentive for Chinese metal to move into the London system. Enough metal arriving quickly enough would undermine the physical scarcity supporting both the price and the record fund long.
The current flows are helping, but so far they have not been sufficient to remove the squeeze.
Why Funds Are Still Bullish Zinc
The bullish case sits further upstream.
Global mine supply had already endured three consecutive years of contraction before rebounding in 2025. But the rebound is losing momentum: mine production growth slowed to just 1.1% year-on-year in January–May 2026.
The competition for zinc concentrates has consequently pushed treatment charges to extreme levels. Spot treatment charges for Chinese imported concentrate have fallen to around minus $117.50/t, placing intense pressure on smelter economics.
Funds are effectively betting that current Chinese refined-production growth cannot persist indefinitely under those conditions.
If Chinese smelters cut operating rates, the surplus currently sitting inside China could begin shrinking just as London inventories remain constrained.
That would validate the positioning.
If Chinese smelters continue running hard despite poor treatment terms and exports accelerate, the record long becomes considerably more vulnerable.
Copper: Geography Still Dominates
Copper provides the second major example of physical-market fragmentation.
The acute LME squeeze seen earlier in August eased as metal returned to warehouses, but available stocks are tightening again.
Three-month copper reached as high as $14,343/t on August 25, while traders ordered the withdrawal of 65,400 tonnes from LME warehouses.
The underlying distortion is US trade policy.
COMEX copper inventories have risen for 46 consecutive days to a record 675,185 tonnes, as traders continue moving refined copper towards the US ahead of a potential tariff on imports from 2027.
The US imported almost 885,000 tonnes of refined copper in the first half of 2026, more than twice the volume imported in the same period of 2024.
That creates an unusual market.
There is no obvious global shortage, but a record quantity of copper is effectively stranded in US warehouses while available metal elsewhere becomes scarcer.
The tariff decision could therefore matter more to LME availability than a modest change in global mine output.
Aluminium: Tight Exchange, Improving World
Aluminium remains another market where exchange liquidity and global physical supply are moving differently.
LME inventories are near their lowest since 1990 at roughly 250,000 tonnes, with nearly all remaining available metal Russian-origin. Much of that metal is commercially constrained by sanctions, buyer restrictions or financing structures.
Yet the wider supply picture is becoming less tight.
Gulf smelters are gradually recovering from disruption, Indonesia is adding new primary capacity and China is exporting increasing volumes of alloys and semi-fabricated aluminium.
That means an improvement in global aluminium availability does not necessarily create a rapid increase in LME warrants.
For positioning, the distinction is critical.
A fund can be directionally right about improving global supply and still be caught by a short-term London liquidity squeeze.
Nickel, Lead and Tin
The 21 August LME positioning reports also cover nickel, lead and tin, but none currently presents as extreme a positioning-versus-physical dislocation as zinc, copper or aluminium. The LME confirms current reports for the 21 August position date across its non-ferrous complex where open positions exist.
That does not make them unimportant.
Nickel remains dominated by Indonesian supply growth and the economics of high-cost producers elsewhere. Lead remains a comparatively smaller, more balanced market, while tin's small market size means even modest changes in mine output or inventories can translate into disproportionately large price moves.
For The Lode, these contracts become most interesting when positioning begins moving sharply against inventory or physical-market signals.
Bloodstone View
The latest LME data reinforce a theme running through base metals in 2026: the global balance is not the trade. The location of the balance is.
Zinc is supposedly in surplus.
Yet funds have built their largest bullish position since LME positioning records began, cash spreads are tight and the three-month price has reached a four-year high.
The reason is straightforward. Most of the surplus is in China.
Copper presents the same phenomenon from another direction. There is plenty of visible copper globally, but record volumes are sitting in US warehouses because tariff expectations make America the most profitable destination.
Aluminium offers a third variant. Global supply is recovering even while usable LME liquidity remains extraordinarily scarce.
This creates a more complicated relationship between fund positioning and conventional supply-demand analysis.
A large long position in a genuinely tight global market is easy to understand.
A large long position in a nominally surplus market can be more interesting because it tells us the market is pricing something the headline balance does not capture.
In zinc, funds are effectively betting that the Chinese surplus will not remain indefinitely accessible — either because domestic smelter economics deteriorate or because the amount of metal capable of moving into London remains insufficient.
That makes China-to-LME flows the critical test of the record zinc long.
The bull case is not that the world has no zinc.
It is that London cannot access enough of the world's zinc before the Chinese supply response weakens.
Outlook
Base case — 4–8 weeks: Zinc remains elevated but increasingly volatile as Chinese exports gradually improve LME availability without fully eliminating nearby tightness. Copper remains dominated by US tariff uncertainty, while aluminium exchange liquidity stays tighter than the global balance would otherwise imply.
Bull case: Chinese zinc exports fail to accelerate while smelters reduce production under treatment-charge pressure, validating the record fund long. Renewed copper warrant cancellations and persistent aluminium scarcity broaden the physical-tightness trade across LME metals.
Bear case: Chinese refined-zinc exports increase materially and replenish LME stocks, forcing crowded long positions to unwind. A clear US copper-tariff decision simultaneously redirects metal away from COMEX accumulation, while aluminium supply normalisation begins reaching exchange warehouses.
Investment Opportunities
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Zinc outright and curve exposure: The strongest current positioning momentum in the LME complex, but also increasingly vulnerable to a Chinese export response.
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Zinc miners versus smelters: Extremely weak treatment charges favour upstream concentrate producers relative to smelting businesses facing margin compression.
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Copper relative value: COMEX-LME dislocation remains more informative than a simple outright copper long while tariff uncertainty controls geographic flows.
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Aluminium spreads: Exchange-level liquidity tightness can persist even if outright prices increasingly reflect global supply normalisation.
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Chinese physical-flow monitoring: Hong Kong warrant activity is becoming a direct trading signal for whether China's surplus can relieve Western squeezes.
Key Risks
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Chinese zinc exports accelerate — High impact / near term. A sustained increase in warrant deliveries would challenge both LME backwardation and record fund length.
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Zinc smelter cuts — Medium probability / High impact. Production cuts caused by negative treatment economics would validate the bullish supply thesis.
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US copper tariff clarity — High impact / near term. Any definitive policy could sharply alter COMEX-LME arbitrage incentives.
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Copper warrant cancellations continue — Medium-High probability / High impact. Further LME withdrawals could recreate the extreme availability pressure seen earlier in August.
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Aluminium supply reaches LME warehouses — Medium probability / Medium-High impact. A meaningful warrant rebuild would reduce the market's liquidity premium.
Intelligence Monitoring Points
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LME weekly COTR: Investment-fund positioning across copper, aluminium, zinc, nickel, lead and tin.
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Zinc fund length: More than 110,000 tonnes currently represents the most bullish collective investment-fund position in the LME series.
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China-to-LME zinc flows: Recent warranting totals around 17,000 tonnes; acceleration would weaken the squeeze thesis.
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SHFE zinc stocks: 155,954 tonnes provides the pool from which further arbitrage exports could potentially emerge.
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Copper warrant cancellations: The recent 65,400-tonne withdrawal orders show LME availability is tightening again.
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COMEX copper stocks: Record 675,185 tonnes remains the clearest indicator of the US tariff-driven geographic distortion.
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Zinc treatment charges: Any recovery from current deeply negative levels would improve Chinese smelter economics and weaken the fund thesis.
FAQ
Q: What is the standout signal from the latest LME positioning data?
A: Zinc. Investment funds hold more than 110,000 tonnes of long exposure, the largest collective bullish position since the LME began publishing its current positioning series in 2018.
Q: Why are funds bullish zinc if the market is in surplus?
A: Because most of the surplus metal is in China. London availability remains tight, creating a disconnect between the global refined balance and immediately deliverable LME supply.
Q: What could break the zinc trade?
A: Faster Chinese exports. High London premiums are already pulling metal into LME warehouses, particularly through Hong Kong. If those flows accelerate, the physical tightness supporting the record fund long could unwind rapidly.
Q: Is copper still squeezed?
A: The extreme August squeeze eased, but availability is tightening again as large quantities of LME warrants are cancelled. The deeper problem remains the concentration of record inventories in the US rather than where LME consumers need them.
Q: Why is aluminium different?
A: Aluminium's global supply picture is improving, but those additional tonnes are not necessarily entering LME warehouses. Exchange liquidity can therefore remain tight even while the physical global balance normalises.
Q: What is the single most important thing to watch next?
A: Chinese metal moving into London. Zinc currently offers the clearest test: if China's surplus can reach LME warehouses fast enough, record bullish positioning becomes vulnerable. If it cannot, a globally surplus market can continue behaving like a local shortage.