Copper arbitrage shrinks to $100 as COMEX traps 718,000 tons in US

Commodity trading desks confronted a collapsing transatlantic copper arbitrage on Nov. 9, 2026, as speculative fund liquidations met an aggressive physical buying wave across Asian bonded warehouses.

The New York COMEX premium over London Metal Exchange cash metal shrank to between $100 and $150 per metric ton on Nov. 9, down from peaks exceeding $2,900 per ton. That narrowing stripped commercial traders of transatlantic delivery margins.

COMEX warehouses held 718,000 metric tons of copper cathode at the end of October. That regional stockpile represents 69% of all visible copper stocks monitored across world metal exchanges, up from a 16% historical average.

The geographic dislocation stems from federal trade policy under Section 232 of the Trade Expansion Act of 1962. The White House imposed a 50% import tariff on semi-finished copper shapes on Aug. 1, 2025, but exempted raw unwrought cathode.

Anticipation of expanded cathode tariffs pulled 740,000 metric tons of excess imports into American ports throughout 2026. Traders rushed volumes into domestic storage before trade barriers could lock foreign cathode out of North America.

That trade flow reversed abruptly on Nov. 9, 2026, as macroeconomic funds sold futures contracts following equity volatility and political uncertainty surrounding trade executive orders.

Benchmark three-month copper on the London Metal Exchange recovered 0.7% to $13,869 per metric ton on Nov. 9. The most-active contract on the Shanghai Futures Exchange rose 0.5% to 107,430 yuan ($16,096) per ton.

While financial funds liquidated futures positions in Western financial centers, physical fabricators in East Asia scrambled to secure prompt metal. Chinese wire and transformer manufacturers faced the tightest spot market in three years.

The Yangshan copper import premium reached an all-time record of $230 per metric ton on Nov. 9. The premium represents the dollar surcharge paid over London benchmark prices to deliver cathode into Shanghai bonded zones.

Deliverable inventories in Shanghai Futures Exchange warehouses dropped 24% last week to 33,848 metric tons. That volume covers less than one single day of Chinese domestic industrial consumption.

Spot delivery surcharges inside China tripled within two weeks to 2,615 yuan ($392) per ton on Nov. 9. Chinese downstream fabricators had depleted factory inventories during earlier market rallies and required immediate prompt metal.

The inventory drain falls directly on East Asian smelting groups and cable mills. Jiangxi Copper Co. refines over 2.0 million metric tons of cathode annually, representing roughly 16% of total Chinese domestic output.

Jiangxi Copper and regional rival Tongling Nonferrous Metals Group have operated cathode drawing units near capacity despite severe shortages of imported copper concentrate. Low treatment and refining charges have forced smelters to draw on existing inventory reserves.

Asian manufacturers of high-voltage transmission lines, industrial motors and electrical transformers now pay acute premiums to replace working stock. The Yangshan premium stood at just $20 per ton in January before escalating steadily.

South Korean cable manufacturer LS Cable & System and Japanese fabricators face similar feedstock cost inflation across non-bonded trade routes. Asian fabricators must outbid Chinese buyers who are absorbing marginal seaborne cargoes from Chile and Africa.

Conversely, North American industrial consumers face domestic inventory gluts that cannot be liquidated overseas without incurring heavy logistics discounts. Metal accumulated inside the United States cannot easily re-enter global trade channels.

American wire manufacturer Southwire Co., which consumes roughly 450,000 metric tons of copper rod annually across domestic fabrication facilities, operates in an isolated pricing zone. Domestic rod premiums remain tethered to elevated regional storage carrying charges.

The distortion originated when the Department of Commerce recommended a tiered tariff schedule on refined cathode. The proposal suggested a 15% tariff beginning Jan. 1, 2027, followed by a 30% duty starting Jan. 1, 2028.

The Commerce Department submitted its Section 232 final report to the White House on June 30, 2026. Executive officials have deferred issuing a final proclamation, leaving the commercial start date unconfirmed.

That procedural delay triggered the unwinding of the arbitrage spread. Financial participants who purchased physical copper in London and sold COMEX contracts found inventory financing costs exceeding the shrinking price differential.

Logistics operators report cathode unloading at American ports will drop from 230,000 metric tons in October to less than 100,000 metric tons in November. Ocean carriers are re-routing uncommitted breakbulk shipments toward Qingdao and Shanghai.

The US Department of Commerce has not published an executive determination on the proposed Jan. 1, 2027 cathode tariff, and Commodity Futures Trading Commission records do not settle the exact daily volume of net short contracts liquidated by Western funds on Nov. 9.

Physical delivery commitments for December will test both regional markets as calendar-year supply contracts expire. Chinese wire and tube fabricators enter annual long-term contract negotiations with international mining houses starting late November.

The proposed 15% Section 232 cathode tariff faces a nominal implementation milestone on Jan. 1, 2027. Federal trade authorities must either sign the tariff proclamation or formally extend the review window before that date arrives.