Copper Hits Record $14,875, Then Drops 4.7% on Tariff Stall

Copper hit an all-time intraday high of $14,875 per tonne on the London Metal Exchange on 10 September 2026, then gave back roughly 3% within hours. On COMEX, US copper futures fell 4.7% in the same session. The trigger was not a supply shock or a demand collapse. It was a report that a planned US tariff escalation on refined copper appears to be losing momentum.

That is the striking part. A policy signal that has not yet produced a formal announcement moved one of the world’s most important industrial metals by hundreds of dollars per tonne in a single day.

The tariff process itself, not any final decision, has become the price-moving mechanism. Traders are repricing copper around the absence of a ruling as aggressively as they would around the ruling itself.

Here is what the stall means for prices, and what the record copper stockpile sitting in US warehouses tells you about where this market could go next.

A record high, then a 5% collapse in hours

The sequence on 10 September was quick and unforgiving. LME three-month copper pushed to an intraday record of $14,875 per tonne, the highest price the contract has ever printed. Within the same session it reversed to roughly $14,329.50 per tonne, a decline of about 3% on the day.

The selling was not confined to London. On COMEX, copper futures dropped to $6.49 per pound, equivalent to around $14,308 per tonne, down 4.7% on the session. When both the London and US benchmarks fall together on the same news, it signals a market-wide reassessment rather than an exchange-specific quirk.

The domestic price premium that emerged as COMEX and LME benchmarks diverged reflects a structural market split, with US buyers paying a tariff-anticipation surcharge on top of the international benchmark even before any formal levy took effect.

This was not an isolated spike either. Earlier in the same week, LME copper had already set intraday records above $14,600 per tonne, driven by tariff anxiety and a tightening physical squeeze. So 10 September delivered both the peak and the break in the space of days.

The sharpest single-session signal: COMEX copper futures fell 4.7% intraday on 10 September 2026, the clearest measure of how fast the market repriced tariff risk.

The key price markers from the session and the days before it:

• LME intraday record: $14,875 per tonne (10 September 2026)
• LME 3-month close: approximately $14,329.50 per tonne, down about 3% intraday
• COMEX futures: $6.49 per pound (approximately $14,308 per tonne), down 4.7%
• LME earlier-week record: above $14,600 per tonne (early September 2026)

The speed of the reversal tells you something important about what is holding copper at these levels. Prices near $14,000 per tonne are not resting on stable supply and demand fundamentals. They are perched on a continuous reassessment of a policy outcome that has not been confirmed. For anyone holding copper exposure, a single news cycle producing a 4-5% intraday swing is the clearest evidence yet that policy optionality, not physical conditions, is setting the price.

What stalled, and how a non-decision moves a market

The problem is not one missed deadline. It is a layered sequence of delays, each keeping tariff risk alive while denying the market the clarity it needs to reprice with confidence.

A key White House deadline for a formal decision on refined copper tariffs passed on or around 8 September 2026 without any announcement, according to markets coverage. Traders read the silence as hesitation rather than resolution, and began positioning for the possibility that a levy might arrive later, or not at all.

The White House Section 232 copper import proclamation, issued in July 2025, established a phased universal import duty on refined copper starting January 1, 2027, and set June 30, 2026, as the deadline for the Commerce Department to provide its assessment update, cementing both the policy timeline and the review mechanism that markets have been watching.

Behind that sits a second delay. A US Commerce Department assessment on copper tariffs, originally due by 30 June 2026, had still not been released as of 10 September, according to Caixin Global. That prolonged review has helped lift international prices by more than 10% since July, as the market priced in the anticipation of action that never formally came.

The front-loading dynamics that produced this inventory concentration accelerated sharply after December 2025, as importers moved to establish positions ahead of any formal Commerce Department ruling, compressing delivery timelines and pushing physical premiums to levels not seen in over two decades.

How the risk built up

The chronology explains why the market is on edge:

1. December 2025: Goldman Sachs Research estimated a 55% probability that the US would announce a 15% tariff on refined copper in the first half of 2026, with the possibility of that rate climbing toward 30% by 2028.
2. 30 June 2026: The Commerce Department assessment deadline passed without a released report.
3. August 2025: A round of 50% import tariffs took effect, but refined copper was explicitly excluded and left under active review.
4. 8 September 2026: The White House decision deadline passed with no announcement.

Here is the mechanism that matters. A missed deadline does not cancel the tariff risk. It widens the range of possible outcomes, and a wider range forces traders to price in more uncertainty, which is itself a market-moving force.

That is why commodity markets can be more volatile during a review period than after a policy actually lands. Traders are not reacting to a decision. They are reacting to the absence of one, and an absence is far harder to hedge than a known number.

The copper stockpile distortion that makes this moment unusual

The inventory data is not a dry footnote to this story. It is a physical record of how the market has already been voting with metal, and it makes the stakes of a tariff reversal far larger than a routine price correction.

Combined inventories across the LME, COMEX, and Shanghai Futures Exchange (SHFE) reached 1,065,512 tonnes at the end of June 2026, according to an analysis of International Copper Study Group (ICSG) data. That is the highest level since May 2003 and 43% above end-2025. Almost all of the build came from the LME and COMEX, while SHFE inventories actually declined by 9,610 tonnes over the same window.

The concentration in US warehouses is the part with no modern precedent. In February 2026, more than half of all global exchange copper stocks, 535,715 tonnes out of a total of 1,012,065 tonnes, sat in COMEX warehouses, all of which are located in the United States.

The metal you cannot see on an exchange

The visible inventory is only part of the picture. Macquarie estimates that a further 550,000 tonnes of copper sits off-exchange in the United States, according to analysis published in July 2026. Add that to the confirmed exchange stocks and the physical market looks considerably looser than the headline price implies.

That loose underlying market matters because the ICSG reported a global refined copper cathode oversupply of 396,000 tonnes in the first quarter of 2026. Prices near record highs, sitting on top of a confirmed surplus, is a divergence that only makes sense if tariff-risk premium is doing the heavy lifting.

This inventory picture tells you that a large volume of copper has been physically shipped into US storage specifically because of tariff expectations. That is not a passive market condition. It is a bet on a tariff outcome, and the size of the bet creates asymmetric downside risk. If the tariff path narrows, that metal could flow back into the global market and amplify any correction.

What the structural demand case means when tariff clarity finally arrives

Two forces are pulling copper in opposite directions, and the outlook depends entirely on which one wins the next few months.

On one side is the mean-reversion case. Goldman Sachs Research, in a note dated 23 January 2026, projected prices staying supported near $13,000 per tonne in the first quarter, then declining toward $11,000 per tonne by year-end once tariff clarity emerges. The bank’s “fair value” estimate sits near $11,500 per tonne, well below where copper traded on 10 September.

The benchmark for the dislocation: Goldman Sachs estimates copper’s fair value at approximately $11,500 per tonne, more than $2,800 below the 10 September LME price.

On the other side is the structural demand case, which analysts cite as a genuine counterweight to any tariff-driven weakness. The three drivers most often named:

Clean energy demand growth for copper spans power grid upgrades, EV charging networks, and utility-scale storage systems, each of which adds incremental tonnes per gigawatt of installed capacity and sets a floor beneath prices that pure tariff-premium analysis tends to understate.

• Power grid expansion and electrification of energy systems
• Electric vehicle rollout and the associated charging infrastructure
• AI and data-centre infrastructure, which Caixin Global links directly to the 10%-plus price gain since July 2026

Bloomberg coverage adds a further wrinkle. The rally has been reinforced not only by tariff anxiety but by mine supply constraints and operational struggles, which means even a clean tariff resolution would not strip out all of the supply-side support beneath the price.

The gap between Goldman’s $11,500 fair value and the $14,329 price on 10 September tells you that a substantial slice of the current copper price is tariff-risk premium. Clarity in either direction will force a reckoning with that gap. For investors watching copper exposure, the central variable is not whether tariffs happen, but when and at what level, because the scale of the US inventory overhang means the market’s response to any formal announcement will be amplified relative to a normal policy cycle.

What changes when the tariff decision finally lands

The core tension is now clear. Copper is priced well above what its confirmed surplus and Goldman’s fair value estimate would justify, sustained by a mix of tariff-risk premium and structural demand optimism. But the physical inventory overhang in US warehouses creates specific downside exposure if tariff escalation fails to materialise.

The numbers frame the asymmetry. The LME price of roughly $14,329 per tonne sits about $2,800 above Goldman’s $11,500 fair value estimate. Meanwhile, 535,715 tonnes on COMEX plus an estimated 550,000 tonnes off-exchange means over one million tonnes of copper is concentrated in US storage, much of it moved there on the expectation of a tariff that has not arrived.

Three variables will determine whether the current level is a temporary dislocation or the start of a sustained correction:

1. The Commerce Department report. Watch for the timing and scope of any release. A hard tariff recommendation supports current prices; a soft one removes a pillar.
2. The White House announcement. Track the direction and magnitude of any formal tariff decision. Confirmation narrows the overhang risk; a step-back exposes it.
3. Inventory behaviour. Monitor whether COMEX and off-exchange US stocks hold or begin unwinding. An unwind would signal the tariff bet is being closed.

Commodity market fragmentation across regional exchange benchmarks has made single-session price moves like the 10 September reversal harder to read, because the same underlying metal now clears at materially different prices depending on where it physically sits and which exchange warrant it is registered against.

Goldman has flagged the key risk scenario directly: if tariffs are delayed or abandoned after large stockpiles have already been built, prices could face amplified downside. The outcome is close to binary. Tariff confirmation justifies elevated prices, while a formal step-back leaves a market priced for an event that never came.

Structural demand from the energy transition and AI is a real long-run support. It does not, however, answer the near-term question of whether $14,000-plus copper is sustainable in a confirmed surplus with no tariff in place. You do not need to predict the policy outcome to act on this. You need to understand the asymmetry, so you can size copper exposure appropriately while the decision remains pending.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Past performance does not guarantee future results. Financial projections are subject to market conditions and various risk factors, and forward-looking statements are speculative and subject to change based on market and policy developments.