By: Natalie Scott-Gray, Senior Metals Demand Analyst, EMEA and Asia region
More than 1.2 million tonnes of copper have been drawn into United States warehouses ahead of a tariff that has not yet been imposed. Section 232 is the United States trade provision under which the administration can apply tariffs to imported copper on national security grounds, and the copper market has spent months positioning for a decision that keeps being deferred. That deferral is not a neutral state. It has already redrawn global copper flows, pulled metal out of the rest of the world, and left the largest swing factor in the market sitting outside the metal's own supply and demand balance.
Giles Plumb is Head of Base Metals Trading at StoneX, where he runs the firm's copper book and works across the base metals complex. He brings more than 25 years in global commodities markets, including time dealing in the London Metal Exchange ring, and he tracks the exchange microstructure, spreads, and physical flows that tariff policy is currently reshaping.
Section 232 has become one of several forces pulling copper in different directions on any given trading day, alongside tight supply, dominant positions on the exchange and falling stock levels. Plumb describes the daily task as ranking them, noting that "there's tightness of supply, there's dominant positions, there's stock levels, Section 232, you wake up every morning and something's very different overnight". Copper volatility has less to do with the metal's fundamentals in isolation and more to do with which policy or positioning input dominates that session. For anyone managing physical copper exposure, that means the risk being hedged is partly a policy risk, and it moves on a schedule nobody controls.
"There's a lot of material there. I don't think he'll want that to go anywhere else, so in theory he will probably put tariffs on", Plumb says of the copper drawn into the United States. The scale is the point, more than 1.2 million tonnes accumulated onshore, whether by design or as an accidental consequence of tariff commentary. Metal parked in United States sheds is metal that is not available to consumers in Europe or Asia, which tightens the same global market that was already showing declining first half production and falling exchange inventories. As a result, the copper surplus forecast on a global basis is not the surplus any individual region actually experiences.
The copper that moved onshore is not expected to move back, and the reason is commercial rather than logistical. Plumb explains that "it won't come back from the U.S. sheds because there's no reason financially to do that, but people want to keep it there just in case he puts the tariffs on". The benchmark timing that traders watch is derived from a 90-day window following the tariff recommendation reaching the administration, though a decision may not arrive within it at all. According to Plumb, "everyone's very wary, the fact that he didn't do it last time, or he might just keep the decision bubbling away in the background and not actually make a final decision". For the physical copper market, an indefinite deferral is functionally its own outcome, holding stock in place and keeping the metal out of circulation.
--- Written by Frédéric Guétin, StoneX Media Producer
--- Experts: Giles Plumb, Head of Base Metals Trading at StoneX, and Natalie Scott-Gray, StoneX Senior Metals Analyst
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Copper has rallied on tight supply and falling inventories, but the largest single variable sitting over the market is a United States tariff decision that has still not been made. More than 1.2 million tonnes of metal moved onshore in anticipation, and that material is not going anywhere while the question stays open.
Copper and zinc prices are both climbing on the same squeeze, falling LME inventories, tight concentrate markets and record backwardation. StoneX Head of Base Metals Trading Giles Plumb and StoneX Base Metals Sales and Trading specialist Calvin D'Andrea join Senior Metals Analyst Natalie Scott-Gray to explain what is moving each metal. Copper sits under unresolved Section 232 tariff policy, more than 1.2 million tonnes of metal drawn onshore in the United States, and speculative money arriving through the artificial intelligence trade. Zinc is a physical story, with spot availability outside China thin and stock slow to move.
Copper Section 232 tariffs are still undecided, and the guessing has pulled more than 1.2 million tonnes of metal into U.S. warehouses. Natalie Scott-Gray, StoneX Senior Metals Analyst EMEA & Asia, breaks down the three forces behind copper's move to record highs. Global stock levels hit a record at the end of the first quarter, with more than two thirds of metal held in U.S. warehouses and available material elsewhere at historical lows. The International Copper Study Group reported mine supply down 1.1% in its first half report, raising the prospect of a rare outright decline in production this year. Copper's correlation with U.S. technology stocks has also reached its highest level since 2012.
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