Antofagasta, one of the world's largest copper miners, got a small vote of confidence from a European broker this week. AlphaValue/Baader Europe nudged its price target on the London-listed stock to 27.28 pounds from 27.06 pounds. But the upgrade is modest, and the broker's underlying message is cautious: the shares' slide after 2026 may not be finished.
The adjustment comes as copper markets wrestle with two competing forces. On one side, the metal has been touted as a key beneficiary of the artificial intelligence boom, with data centers and power grids needing vast amounts of copper for wiring and cooling. On the other, global mine supply is expected to expand in the coming years, and that growing surplus could weigh on prices.
Why Antofagasta matters
Antofagasta is a Chilean copper producer with operations in the Atacama Desert, one of the world's richest copper regions. The company is often seen as a pure play on copper prices, meaning its earnings and share price are closely tied to the metal's moves. When copper rises, Antofagasta tends to do well; when it falls, the stock often suffers.
That sensitivity makes the broker's warning particularly relevant. If copper prices are set to soften as supply catches up with demand, Antofagasta's profits could come under pressure, even if the long-term AI story remains intact.
The AI-copper narrative has been a powerful driver for the sector. Data centers, which power AI models, require enormous amounts of electricity and cooling, and copper is essential for both. Analysts have pointed to this as a potential source of demand growth that could outpace supply. But the broker's note suggests that the market may have gotten ahead of itself, at least for the medium term.
The growing surplus
Copper supply has been ramping up, with new mines and expansions coming online in several countries. At the same time, some demand forecasts have been trimmed as global economic growth slows. The result is a projected surplus that could build through the late 2020s.
That surplus is a key reason the broker thinks Antofagasta's stock could keep sliding after 2026. The company's earnings are expected to peak around then, as current projects reach full production, but if copper prices fall, those earnings could decline.
Investors have already seen copper prices wobble recently. In a separate development, copper hit a 2-1/2 month low as tech stocks stumbled and China's yuan weakened, underscoring how sensitive the metal is to global risk sentiment. And traders trimmed risk ahead of the US midterms, adding to the pressure.
Chile, the world's top copper producer, has also been in the spotlight. The country's economy grew in September despite a copper slump, but output forecasts have been cut, which could tighten supply in the near term. That has helped support prices at times, but the longer-term surplus picture remains.
What it means for investors
For everyday investors, the key takeaway is that Antofagasta's stock is not just a bet on copper prices today, but on where they will be in several years. The broker's price target increase is small, suggesting limited upside from current levels, and the warning about a post-2026 slide is a reminder that commodity cycles can turn.
Investors should also consider that copper is a global economic bellwether. When growth is strong, copper demand rises; when growth falters, prices can fall quickly. The AI story adds a new layer of potential demand, but it is not guaranteed to offset a supply glut.
If you own Antofagasta shares or are thinking about buying them, it's worth watching copper inventory data, mine output reports, and any updates on AI infrastructure spending. A growing surplus could mean lower prices and weaker earnings, while a surprise supply disruption could flip the narrative.
The broker's note is just one view, but it aligns with a broader market debate about whether copper's long-term prospects are being overhyped. As with any commodity stock, volatility is part of the package.
The bottom line
Antofagasta's AI copper story is compelling, but the market is starting to price in a more balanced supply-demand picture. The modest price target hike reflects that reality, and the warning about a post-2026 slide is a clear signal that the easy gains may be over.
For now, investors should keep an eye on copper prices and the pace of new mine supply. The next few years will tell whether the AI boom can absorb the surplus, or whether Antofagasta's shares have further to fall.
