01 THE SETUP

Copper spent the last stretch of July flashing signals that normally point to acute scarcity. The London market swung into backwardation as its cash-to-three-month spread moved from a small contango to a $44.50 backwardation as available LME stock fell to about 250k tonnes and cancelled warrants reached 59% of the total. On-warrant copper in London had halved in roughly two weeks to near 100,000 tonnes (the lowest since January). The COMEX–LME premium sat at about 19¢ a pound, some eight times its two-decade average, and Chinese import premiums hit their highest since 2022.

Meanwhile, the International Copper Study Group’s (ICSG) realized data showed a ~221,000-tonne surplus over the first five months of the year, while combined exchange inventories climbed to levels not seen since 2003.

Of course, none of this is surprising given continued front-running of a U.S. tariff decision that, with the June 30 deadline come and gone without a decision, still hasn’t arrived. But that explanation stops short of answering the real question — just how far has the U.S. tariff trade distorted the copper market?

02 WHY IT MATTERS

“The U.S. tariff trade” and other catch phrases identify the cause of the extremes without saying anything about how large the resulting dislocation actually is — whether the market is modestly skewed or profoundly bent. That distinction is what determines how much strain the rest of the world is under and how much metal an eventual normalization would release.

03 THE DECODE

The magnitude of the “U.S. tariff trade” distortion is knowable, at least approximately, from fundamental data.

Excess import flow and inventory build

U.S. refined-copper imports rose from 903,000 tonnes in 2024 to 1.7 million tonnes in 2025. After exports, net imports more than doubled, from roughly 577,000 tonnes to 1.36 million — an additional 783,000 tonnes in a single year. And while apparent consumption rose too, it only rose around 320,000 tonnes, while year-end stocks increased by 327,000 tonnes.

The same USGS series also shows year-end U.S. refined stocks — held across producers, consumers, and exchanges — rising from 123,000 tonnes in 2024 to 450,000 in 2025, a 3.7x jump in a single year, driven by refined imports that themselves nearly doubled from 903,000 tonnes to 1.7 million. And the hoard is still growing. Combined COMEX and LME inventories held in the U.S. now exceed 740,000 tonnes, with a further ~111,000 tonnes in private U.S. port storage, after more than 200,000 tonnes arrived in July alone — the largest monthly inflow in IHS Markit shipping data back to 2014.

Exchange concentration

CME warehouses alone now hold 58% of visible global exchange copper. Yet the U.S. is a modest share of actual demand: reported and apparent U.S. consumption of 1.7–2.2 million tonnes is roughly 6-8% of the ~27.4 million tonnes the world consumes each year (China alone is ~58%). That is perhaps the clearest measure of how far tariff front-running has bent the market: the copper has not disappeared, but the majority of the exchange-visible buffer has accumulated in a country responsible for less than a tenth of end use.

However, exchange concentration extends beyond the U.S. simply holding ‘more than its fair share’ of copper. Current LME and SHFE inventories are not abnormal by historical standards, even if SHFE warehouses are considerably emptier compared to levels held earlier in the year. And yet, a combined ~1 million tonnes currently sits in global exchange warehouses — approximately double the combined 2024 average of around 500k tonnes, and an even greater multiple above historical standards.

tl;dr

The tariff trade has absorbed volumes several times larger than any underlying supply-demand imbalance, and concentrated visible inventory at roughly seven to ten times America’s share of global consumption whilst driving global inventories abnormally high.

None of that is to say that the market isn’t tight upstream — mine production is weak and concentrate treatment charges confirm that. However, absent tariff front-running, the refined market would look significantly less distorted.

04 WHAT TO WATCH
 
The spread, as the running gauge. The COMEX–LME premium is the cleanest real-time gauge of the marginal incentive to keep moving copper into America. At ~19¢ a pound it’s rich against history, but well short of the ~$1.30/lb spike of July 2025, leaving room in both directions. Widening signals the distortion deepening; compression signals it draining back.

The ex-U.S. cover. The four-day figure is the fragile one, and the London tape is where it shows first — cancelled warrants, the Yangshan premium, and Shanghai stock levels together indicate whether the drained side of the market is tightening further or being refilled.

The unwind. A distortion of stock reverses as a flow. Whenever the arbitrage closes — a confirmed tariff that locks in incentives to hoard, a clean rejection that inverts it, or metal simply losing its reason to sit in American warehouses — excess trapped tonnage becomes mobile, and the gap measured here begins to close. Sizing the distortion now is also a way of sizing what its normalization would release.

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That’s the wire for today. Until next time, copper’s still available… somewhere.

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