Global Copper Stocks Dwindle On Tariff Concerns


The Copper Monthly Metals Index (MMI) moved sideways with an upside bias, rising 2.69% from June to July.

Copper MMI, July 2025
Copper MMI, July 2025

Comex copper prices resumed their uptrend, ending a brief pause witnessed in early June. As of July 7, the price of copper on the exchange stood $266/mt short of its all-time high from late March. This marks an almost 23% rise since the early April low. However, Comex prices aren’t alone. While LME prices remain far short of the all-time high reached in May 2024, they have experienced a similar uptrend since early April, rising by over 14%.

With both contracts on the rise, the considerable delta between the two remains intact. Currently, Comex prices sit nearly 16% higher than their LME counterparts. The bifurcated contracts largely reflected expectations of potential U.S. copper tariffs after the investigation into copper imports began in late February. That delta is likely to expand further after President Trump told press on Tuesday he will likely impose a 50% duty on copper. The announcement came bereft of details, including the timing and scope. Since it was not formalized, the duty rate could change.

U.S. copper tariff threats have offered strong support to the market. That said, this mostly applies to Comex prices, hence their considerable premium over LME. U.S. buyers spent most of the first half filling stocks free of tariffs to hedge against the threat of a potential duty. As a result, global copper stocks remain down, but Comex stocks are up.

In fact, they now tower over their LME and SHFE counterparts. As LME stocks deplete and the spot market becomes increasingly tight, LME prices have been forced to rise to compete for material. Meanwhile, the tight spot market pushed the market into backwardation, with spot prices now coming at a premium to their three-month counterparts. Now that the market has more clarity that the duty will actually occur and likely at 50%, buyers will continue to use whatever window they are given to secure material free of tariffs.

As prices climb higher, global warehouse stocks appear increasingly depleted. While the significant price premium has shifted supply toward the U.S., lifting Comex stocks, LME stocks have remained in decline for almost a year.

Souce: MacroMicro

Following the considerable drawdown, mostly Russian material remains. This is heavily sanctioned by the U.S. and less favored among European buyers. Even as the price of copper fluctuates, tight supply remains a longstanding fear within the market as the world pursues electrification efforts.

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