Have copper stocks already priced in Grasberg supply squeeze?

Copper stocks jumped 6.4% last week, significantly outperforming the metal's 2.2% gain to $4.59/lb, driven by supply disruptions at Freeport-McMoRan's Grasberg mine, which are expected to remove 200,000 tonnes of copper in 2025 and 300,000 tonnes in 2026, representing approximately 1.5% of global supply. This exceptional equity leverage, with copper stocks up 55% year-to-date against an 18% rise in the commodity, suggests that equities may have already discounted a higher price deck despite the metal's potential for further gains, though a stronger US dollar tempered the recent rally.

Analysis

Copper equities are exhibiting significant positive leverage to the underlying commodity, driven by a major supply disruption at Freeport-McMoRan's Grasberg mine. The mine's expected output loss of 200,000 tonnes in 2025 and 300,000 in 2026, representing about 1.5% of global supply, pushed copper prices up 2.2% last week to $4.59 per pound. However, copper stocks surged 6.4% over the same period. This trend is even more pronounced year-to-date, with equities up 55% against an 18% gain in the metal, delivering the strongest outperformance since 2016 and well above the historical 2x leverage noted by RBC. This suggests that a higher copper price deck is already substantially priced into equity valuations, a view supported by analyst targets; for example, Antofagasta's share price of £27.79 is significantly above its £20 target. The rally in copper metal was tempered by a stronger US dollar, while other industrial metals showed mixed results, with iron ore falling 2.5% on tariff concerns. A positive backdrop is provided by record-high gold prices benefiting diversified miners, but sector-wide operational risks remain, as evidenced by Moody's credit warning to Codelco regarding a potential production halt.

Key Decisions for Investors

• Given that copper equities have significantly outpaced the commodity's gains, investors should be cautious as current stock valuations may have already priced in the full benefit of the supply squeeze.
• Consider a relative value approach, favoring miners with more attractive valuations and positive analyst ratings, such as Glencore with its 'outperform' rating, over those like Antofagasta that are trading well above price targets.
• Monitor the strength of the US dollar and broader industrial demand signals, as these macroeconomic factors could cap further upside in the copper price and weigh on equity momentum.
• For diversified miners, assess the balance of exposure between copper and gold, as record-high gold prices may offer a hedge against a potential correction in copper equity valuations.