A record 650,000-ton COMEX inventory build, a 5.5:1 long-to-short ratio and an imminent Section 232 ruling on refined copper create conditions for an outsized volatility event regardless of which way Tuesday's decision lands.
Copper futures (HG) are trading off the all-time highs of $6.6525 per pound reached on June 2, having retreated amid the dollar's strength, which in turn reflected the market's repricing of rate hike odds. The contract is expected to see some volatility in the near term as traders bake in expectations concerning the demand-supply equilibrium and a U.S. Commerce Department tariff decision due Tuesday.
Copper futuresfor September delivery slipped about 1% to $6.15 at last check.
Trading Off Near-term Peak
Source: TradingView
The Commerce Department under Secretary Howard Lutnick is scheduled to deliver a formal report on domestic copper supply and refining capacity to President Donald Trump by June 30. The review was mandated under the original August 2025 Section 232 proclamation, which imposed 50% tariffs on semi-finished copper products (pipes, wires, rods and tubes), while carving out refined copper pending a separate assessment.
The review centers on whether America's domestic refining capacity is sufficient to meet military and critical infrastructure demand in the event of a supply disruption without dependence on foreign supply chains, particularly from Chile, Canada, and China. These countries together account for the bulk of U.S. copper imports. A conclusion that imports constitute a national security threat would give President Trump the legal authority under Section 232 to extend tariffs beyond semi-finished products to refined copper itself.
Reports suggest the proposals under discussion include a phased universal import duty of 15% on refined copper, starting January 1, 2027, potentially rising to 30% by January 2028.
Why the Tariff Impact Isn't a Binary Outcome
The market is not treating a potential 15% copper tariff as a simple yes-or-no event. Instead, prices reflect a range of possible outcomes, including the tariff rate, implementation timeline, exemptions, and the likelihood of the policy being enacted.
As a result, both COMEX and LME copper prices have been adjusting ahead of any final decision. If a 15% tariff is ultimately confirmed, the market reaction will depend on how that outcome compares with existing expectations. This is why traders focus on the evolving COMEX-LME premium, which continuously reflects changing tariff probabilities rather than waiting for a single policy announcement.
The COMEX-LME copper spread currently stands at approximately 9 cents per pound, with COMEX trading at a 1.5% premium to LME. Based on COMEX copper at $6.15/lb and LME copper at $13,357.50/tonne, the implied LME price converts to roughly $6.06/lb, leaving a premium of about $0.09/lb.
A 15% U.S. copper tariff would likely push COMEX copper significantly higher than LME copper because U.S. buyers would rush to secure metal before tariffs take effect, while the resulting diversion of copper into the U.S. would tighten global supply and lift LME prices as well but just by a smaller amount.
Another key factor that could have an impact on the near-term direction of copper prices is copper stockpile.
Record Stockpiles
Ahead of Tuesday's deadline, U.S. COMEX copper warehouse inventories have swelled to historic levels, as importers front-ran the anticipated tariff announcement by pulling forward months of supply.
Caution Drives Dramatic Inventory Build
Source: DataTrack
The chart shows a dramatic increase in inventories from roughly 100,000 short tons in early 2025 to more than 650,000 short tons by June 2026, indicating a substantial accumulation of physical metal. While rising stockpiles can superficially suggest weak demand, this build is widely interpreted as a precautionary accumulation rather than a reflection of slowing consumption.
The distortion it creates is significant: inflated inventory figures may dampen near-term price momentum even as the structural supply outlook tightens. Once the tariff picture clarifies and front-loading subsides, the drawdown in warehoused copper could be sharp, particularly if domestic refining capacity is confirmed to be inadequate.
Crowded Longs
Speculative positioning in copper futures has become heavily skewed to the long side following the contract's surge to all-time highs. CFTC Commitments of Traders (COT) data for the latest week shows managed money net long positions near multi-year extremes.
Managed money funds cut their net long position during the week to June 23, reducing net longs to 68,818 contracts, as long positions declined by 2,476 contracts while short positions edged down modestly by 218 contracts. Despite this weekly reduction, bullish positioning remains elevated, close to the highest levels seen over the past 12 months, with a long-to-short ratio of 5.5:1. The positioning data suggests investors continue to maintain a constructive outlook on copper fundamentals, supported by expectations of tighter U.S. supply conditions, potential import tariffs, and robust long-term demand from electrification and AI-related infrastructure, although the recent trimming indicates some caution after copper's strong rally.
If Tuesday's Commerce Department report disappoints bulls, either by delaying refined copper tariffs, softening the proposed rate, or extending the exemption window, the unwind of crowded longs could drive a swift correction. Conversely, a hawkish ruling that accelerates the tariff timeline could squeeze short sellers and push prices back toward record territory. Either outcome points to elevated intraday volatility on Tuesday and into the week.
What Traders Are Watching
The market's immediate focus narrows to three variables:
- the tariff rate proposed (the 15%–30% phased structure currently in discussion)
- the effective date (January 2027 or sooner)
- Whether the refined copper exemption is revoked entirely or partially preserve