Shares of Alcoa Corp. AA, -1.76% slumped 3.5% toward a seven-month low in afternoon trading Friday, after the aluminum producer said it will immediately start curtailing one of three smelting lines that are operating at its Warrick Operations facility in Indiana, citing “operational challenges.” The company said the one line, which has an annual capacity of approximately 54,000 metric tons, is expected to be fully curtailed by the end of the day. Alcoa’s stock, which is headed for the lowest close since Dec. 1, 2021, has dropped 26.2% year to date, while the S&P 500 SPX, +1.06% has fallen 20.8%.
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