Largest Copper Inflow on Record! 200,000 Tonnes of Copper Arrive in US in July as Market Awaits Trump's Tariff Ruling

Copper metal is flooding into the US market at its fastest pace in at least 12 years, as traders accelerate positioning ahead of Donald Trump's final ruling on import tariffs for refined copper, triggering a large-scale redistribution of global copper inventories.

According to Bloomberg, approximately 200,000 tonnes of copper metal arrived in the United States in July, representing the largest single-month inflow on record in IHS Markit shipping data (which dates back to 2014). Currently, about 110,900 tonnes of copper are stored at US ports, outside the London Metal Exchange (LME) warrant system.

Meanwhile, Comex copper futures prices remain significantly higher than LME prices, with the arbitrage spread providing a direct driver for the continuous flow of copper into the US.

This surge in copper inflows has come at the expense of tightening supplies in other parts of the world. Inventories in LME warehouses outside the US have dropped sharply since the beginning of the year, highlighting how tariff expectations are reshaping the geographic distribution of global copper metal. The White House has yet to make any clear statement regarding the timeline for the ruling, leaving the market in a state of uncertainty.

Tariff Expectations Drive Record Warehousing, US Copper Reserves Break Historic Highs

US copper inventories have continued to accumulate this year. Official Comex inventories have increased by more than 40% since the start of the year, reaching historic highs, with total US copper metal reserves widely estimated by the market to have far exceeded 1 million tonnes.

The core logic behind this trend lies in the sustained effectiveness of the arbitrage mechanism. According to Bloomberg data, the price spread between the front-month Comex copper contract and the LME spot contract averaged over $350 per tonne in July, sufficient to cover transoceanic transportation costs and prompting overseas metal to continue converging on US ports.

Notably, this inflow trend has accelerated even though the June 30 deadline for Commerce Secretary Howard Lutnick to submit tariff recommendations has passed without any announcement.

Producers, consumers, and traders are all waiting for policy clarity, as the White House weighs whether to expand the scope of copper tariff protection from semi-finished products to raw metal.

Bidding on Both Sides of Policy Outlook, Ruling Outcome is Key

Supporters of the tariff plan argue that such tax measures will incentivize investment in domestic mining and smelting industries, helping to strengthen US self-sufficiency in copper—a strategic metal considered critical for power grids, artificial intelligence infrastructure, electric vehicles, and defense sectors.

Opponents warn that tariffs will raise costs for manufacturers reliant on imported copper, undermining the international competitiveness of US manufactured goods.

This debate is layered on top of existing policy foundations—semi-finished copper and its derivatives are currently subject to an existing 50% tariff.

Last July, Trump directed Lutnick to study whether phased tariffs should be imposed on refined copper imports, with an initial rate set at 15% starting in January 2027.

Market expectations suggest that once the ruling is made, it will have a significant impact on trade flows: If tariffs are implemented, it could trigger a final wave of concentrated imports before the rates take effect; if the plan is ultimately shelved, the large positions accumulated over the past 18 months may face unwinding, potentially reversing the direction of copper flows.