Antofagasta stock heads into the open after a 2.2% slide

At the close on September 15, 2026, Antofagasta stock finished at 3,501.00 pence on the London Stock Exchange, down 2.2 percent with a day range between 3,539.00 and 3,754.00 pence. Antofagasta stock also underperformed the FTSE 100 on the day as broader U.K. equities weakened.

Antofagasta stock closed at 3,501.00 pence on the London Stock Exchange on September 15, 2026, losing 2.18 percent from the prior session. The shares traded between 3,539.00 and 3,754.00 pence during the session, highlighting a relatively wide intraday range for investors monitoring the copper miner.

September 15, 2026 in numbers

Antofagasta plc (ISIN GB0000456144, LSE: ANTO) ended the September 15, 2026 session at 3,501.00 pence, down from the prior close as the stock moved within a day range from 3,539.00 to 3,754.00 pence per Investing.com data. Trading volume reached about 1.13 million shares, indicating active turnover on the London Stock Exchange that day. In the same session, Antofagasta was among the bigger fallers in the FTSE 100, with a 2.18 percent decline noted in the London market close wrap, while the FTSE 100 index itself also finished lower amid pressure from rising bond yields and higher oil prices, according to Sharecast. The stock’s drop outpaced the broader index move, underscoring how Antofagasta shares reacted more sharply than the overall blue-chip benchmark in the latest completed session.

Sector commentary also framed the move: U.K. market reports for September 15, 2026 highlighted how mining and commodity-linked names faced selling pressure as investors weighed inflation concerns and the impact of surging oil prices on bond yields and risk appetite, as reported in a London market close article by Morningstar Alliance News. Against this backdrop, Antofagasta’s decline of a little over 2 percent contrasted with comparatively smaller percentage moves in some other FTSE 100 constituents, reinforcing the impression that the stock was particularly sensitive to the day’s macro drivers. A broker note from Berenberg also entered the mix: the firm upgraded Antofagasta from Hold to Buy while maintaining a price target of 4,400 pence, a level that implied roughly 23 percent upside to the September 14 closing price of 3,586 pence, as detailed by The Armchair Trader. While the upgrade itself was supportive in fundamental terms, it arrived in a trading environment dominated by wider risk-off sentiment across U.K. equities.

Today’s factors for Antofagasta

Looking ahead to today’s session on September 16, 2026, Antofagasta does not have a publicly flagged earnings release or annual meeting date falling today in the latest investor and earnings calendars, so attention stays on broader drivers and sector signals in the near term. Market participants are likely to monitor macroeconomic prints and commodity price developments that can influence mining stocks, with copper prices and energy markets remaining central to sentiment around Antofagasta after the recent move. Commentary from Antofagasta’s chief executive on copper supply-demand dynamics has emphasized that supply has lagged demand growth for some time, a point reiterated in a media interview covered by CNBC, and such views continue to frame how investors weigh the company’s exposure to potential medium-term copper price trends as trading resumes today.