Widespread expectations that the U.S. Department of Commerce's Section 232 (s232) investigation on copper will result in import tariffs later this year have ignited aggressive positioning in copper markets. The Section 232 study, launched in February 2024, is designed to assess whether copper imports pose a threat to U.S. national security. A similar study previously led to substantial tariffs on aluminium and steel. If copper is deemed critical to domestic security—given its essential role in defence, electrical infrastructure, and clean energy—the U.S. may impose protective tariffs as high as 25% or even 50%.

 

As anticipation builds, traders are moving metal into the U.S. at an unprecedented pace. The impact is visible in inventory trends: COMEX warehouse stocks have ballooned, while inventories on the London Metal Exchange (LME) and Shanghai Futures Exchange (SHFE) have drained rapidly.

 

Source: WisdomTree. Bloomberg. June 2024 to June 2025. Historical performance is not an indication of future performance and any investments may go down in value.

 

Distortions in Market Structure: LME Backwardation Signals Tightness

 

The frantic movement of physical copper is distorting the market’s pricing structure. On the LME, spot prices are now trading at their highest premium to 3-month prices since 2021, a classic backwardation signal. This condition reflects localized supply shortages, in contrast to the usual contango where future prices trade at a premium to spot.

 

Source: WisdomTree. Bloomberg. January 2021 to June 2025. Historical performance is not an indication of future performance and any investments may go down in value.

 

COMEX Price Outperformance and Tariff Premiums

 

COMEX copper has rallied 25% year-to-date, compared to a 13% gain on the LME. This relative outperformance reflects the market's pricing-in of potential U.S. tariffs. As of late June:

 

That equates to a 13% premium for COMEX over LME prices. If a 25% tariff is implemented, COMEX prices could climb further to close the gap. In the event of a 50% tariff (as seen with aluminium), the upside for U.S. prices could be significantly larger.

 

Beyond Tariffs: Tightening Fundamentals Support Prices

 

The U.S. tariff speculation isn’t the only bullish force in the copper market. The International Copper Study Group (ICSG) reported that refined copper shifted into a 50,000-tonne deficit in April 2025, after months of surplus. Although the cumulative 2025 balance remains a surplus of 233,000 tonnes, the trend appears to be reversing.

 

That trend is being reinforced by a string of supply disruptions:

 

Given these developments, we expect the copper market to shift into a full-year deficit, and forecast that ICSG will revise its surplus projection to a deficit in its next update due October 2025.

 

Demand-Side Tailwinds: China’s Grid Boom

 

On the demand side, China is pouring record investment into its electrical grid. Grid expansion entails installing copper-intensive transmission and distribution cabling, providing a robust structural demand backdrop.

 

Source: WisdomTree. Bloomberg. January 2010 to May 2025. Historical performance is not an indication of future performance and any investments may go down in value.

 

China's Refining Economics Reflect Supply Stress

 

In a sign of raw material scarcity, copper treatment and refining charges (TC/RCs) in China have fallen below zero. This implies that smelters are effectively paying miners to secure copper ore, due to insufficient concentrate supply and overcapacity in smelting.

 

On June 27, Reuters reported that Antofagasta agreed to a zero TC deal with Chinese smelters—a record low (but actually a positive surprise that it was not negative). The willingness of smelters to accept such punitive terms may be offset by the value of byproducts like gold and silver, which are extracted alongside copper in refining processes and can help cushion losses.

 

Source: WisdomTree. Bloomberg. January 2010 to June 2025. Historical performance is not an indication of future performance and any investments may go down in value.

 

Conclusion: Bullish Outlook with Policy and Structural Drivers

 

Copper prices are being supported by a rare combination of factors: anticipated trade policy shifts, physical market tightness, production downgrades, and strong Chinese infrastructure demand. If the U.S. imposes tariffs on copper, the price divergence between COMEX and global benchmarks could widen further, especially in a tightening supply environment. All signs point to a bullish trajectory in the second half of 2025.

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