Copper shipments into the United States continued to surge as traders sought to capitalize on the price premium between the COMEX and London Metal Exchange (LME) markets ahead of a potential U.S. decision on refined copper import tariffs. According to IHS Markit shipping data, more than 200,000 tonnes of refined copper arrived at U.S. ports during July, marking the highest monthly inflow in more than a decade. Combined inventories held on COMEX and LME facilities in the United States have now exceeded 740,000 tonnes, while additional material remains in storage at U.S. ports awaiting delivery. The movement of metal into the U.S. has tightened availability in other key trading hubs. Market participants reported significant inventory declines at bonded warehouses in Shanghai, where stocks have fallen sharply since the beginning of the year as cargoes have been redirected to the U.S. to capture favorable arbitrage opportunities. The premium of COMEX copper over LME prices has remained well above historical norms, providing sufficient margin to offset transportation, insurance and warehousing costs. The shift comes as the U.S. administration continues to evaluate potential tariffs on refined copper imports. While the timing and scope of any measures remain uncertain, the prospect of future trade restrictions has already reshaped global trade flows and inventory distribution. The continued migration of copper inventories into the United States is tightening physical availability across international markets and supporting a firmer supply outlook outside North America. Any delay, revision or cancellation of proposed U.S. import tariffs could narrow the COMEX-LME price premium, potentially reversing some of the recent inventory movements and increasing short-term price volatility.

Copper prices climbed to around US$14,000 per tonne on the London Metal Exchange (LME), reaching their highest level in two months as traders continued to monitor record inflows of copper into the United States ahead of an anticipated decision on refined copper import tariffs. According to foreign media reports, more than 200,000 tonnes of copper arrived at U.S. ports during July, representing the largest monthly inflow recorded by IHS Markit since it began tracking the data in 2014. The surge has significantly increased inventories at U.S. warehouses and ports while reducing the volume of metal available to consumers in other regions. The inflows have continued despite uncertainty over potential U.S. tariffs on refined copper imports. Although the U.S. Commerce Department was expected to submit its recommendations by the end of June, no formal decision has yet been announced. The sustained premium of U.S. copper prices over LME prices has continued to support profitable arbitrage opportunities, encouraging traders to redirect material into the U.S. market. Market Impact: The concentration of copper inventories in the United States is tightening physical availability elsewhere, reinforcing an already constrained global market. With copper prices remaining near historic highs and demand supported by electrification, power infrastructure and advanced manufacturing, any tariff decision that further alters global trade flows could intensify regional supply imbalances and provide additional upside for international copper prices.

[SMM Analysis] SHFE copper cathode spot premiums experienced notable volatility in H1 2026, marked by deep discounts in phases, a recovery in Q2, and a return to positive territory by mid-year. In Q1, seasonal inventory buildup after the Chinese New Year, slow downstream recovery, and disruptions from contract rollovers repeatedly put spot premiums under pressure. Entering Q2, consumption improved QoQ, and concentrated smelter maintenance drove continuous destocking of domestic social inventory. In particular, the rapid decline in Guangdong inventory lifted spot premiums in South China, opened arbitrage opportunities for shipping inventory from East China to South China, and provided support to premiums in Shanghai and other regions. From May to June, although high copper prices and off-season expectations suppressed downstream purchases, the widening LME-COMEX spread diverted overseas supply to the US market, constraining the pace of imported copper replenishment in China, with low inventory levels still underpinning spot market resilience. Looking ahead to H2, SHFE copper premiums will be shaped by the interplay of inventory, consumption, imports, and supply additions. The Q3 off-season may limit the upside for premiums, but low inventories, uncertainty over import replenishment, and tight regional supply will continue to support spot premiums. In Q4, attention should be focused on the capacity ramp-up of new expansion projects such as Humon Phase 2, Chifeng Jintong Phase 2, and Shenghai Phase 2. If new supply is released smoothly, the import window opens, and consumption recovery remains weak, spot premiums may gradually come under pressure. However, if inventories stay low and import replenishment remains limited, premiums could still see intermittent strengthening opportunities.

SMM Analysis | June 30 marks a critical milestone in the U.S. Section 232 copper investigation. Will refined copper tariffs proceed as expected? Whether the outcome is a broad tariff, targeted measures, or a delay and exemption, the decision could reshape the COMEX–LME arbitrage, U.S. physical premiums, global copper trade flows, and regional supply dynamics.

In May, China's copper cathode imports rebounded to 282,300 mt, up 4.38% MoM and up 10.20% YoY. The continuous rebound in imports in May effectively alleviated the tight supply of some spot copper in China. However, from a longer-term perspective, cumulative imports from January to May stood at 1.1443 million mt, still down 15.69% YoY, reflecting a structural adjustment in the overall import flows of long-term contracts and spot cargo this year compared to previous years.

[SMM Stainless Steel Daily Review] Stainless Steel Futures Extend Pullback, Spot Market Confidence Weakens SMM, June 10. SS futures are trending lower and probing downside. Dragged further by the overall weakness in nonferrous metals futures, SS futures extended their pullback. As of the midday close, the most-traded SS contract was quoted at 14,410 yuan/mt. In the spot market, affected by the successive declines in SS futures, the support level that the market had originally pinned hopes on at 14,500 yuan/mt was broken, after which market confidence weakened significantly. Traders’ willingness to sell and destock increased notably, low-priced cargoes frequently emerged in the market, buying interest was clearly insufficient, and overall transactions remained mediocre during the day. The most-traded SS futures contract declined and pulled back. At 10:15 am, SS2607 was reported at 14,395 yuan/mt, down 75 yuan/mt from the previous trading day. Spot premiums for 304/2B in Wuxi were in the range of 575-1,225 yuan/mt. In the spot market, the average price for cold-rolled 201/2B coil in Wuxi was flat; for cold-rolled raw-edge 304/2B coil, the average price in Wuxi fell 50 yuan/mt and in Foshan fell 25 yuan/mt; the price of cold-rolled 316L/2B coil in Wuxi was unchanged; for hot-rolled 316L/NO.1 coil, the quotation in Wuxi fell 100 yuan/mt; cold-rolled 430/2B coil prices in both Wuxi and Foshan held steady. Stainless steel futures and spot experienced heightened volatility. The futures were first boosted then weighed down by macro news from outside China, and the off-season characteristics fully emerged. The industry holds vague expectations for the future market, with a strong wait-and-see sentiment. Transactions showed sporadic recoveries lacking sustainability, and selling pressure on traders mounted...