Antofagasta stock holds firm as copper guidance stays tight

Published on 09/19/2026 at 18:53 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS

Antofagasta stock was trading on the LSE at GBP 23.68 on September 18, 2026, with a market value of GBP 23.3 billion. The group cut 2026 copper output guidance in August by 35,000 to 55,000 tonnes.

Schwarzweiß-Dokumentarfoto von Bergarbeitern mit Helmen an einer Bohranlage im Tagebau — Schwarzweiß-Reportagefoto von Bergarbeitern an Fördertechnik illustriert Antofagasta plc GB0000456144 im chilenischen Kupferbergbau dokumentarisch, Illustration mit AI erstellt.

Antofagasta stock (ISIN GB0000456144) was quoted at GBP 23.68 on the London Stock Exchange on September 18, 2026, with a market capitalization of GBP 23.3 billion and a 52-week range of GBP 18.42 to GBP 24.18. The move leaves the shares close to the top of that band.

August guidance cut still matters

In a weekly market recap, Mining.com reported on September 18, 2026 that Antofagasta cut its 2026 forecast in August, removing 35,000 to 55,000 tonnes from expected output. The same report said the combined cut by Antofagasta and Lundin Mining reached that range, which kept copper supply risk in focus for the market.

That matters because a reduced 2026 outlook is a concrete operating signal, not just a commodity headline. For investors, the scale of the cut is the number to watch.

Price sits near the high

The stock closed at GBP 23.68 on September 18, 2026, after trading between GBP 18.42 and GBP 24.18 over the past 52 weeks. That places Antofagasta stock just 2.1 percent below the 52-week high.

Investor page remains relevant

The company keeps its investor materials on its IR site, and the direct investor-relations entry point is the same one tied to Antofagasta plc's reporting calendar and releases. On a day like this, the market still trades the shares against the backdrop of that August output reset and the current price band.