Shares of aluminum maker Alcoa Corp. AA, +0.89% rose 2.3% in premarket trading Tuesday, putting them on track to open at a three-year high, as a military coup in Guinea has sent aluminum futures prices to a 10-year high. Alcoa’s stock has soared 25.1% over the past three months to close Friday at the highest price since July 18, while the S&P 500 SPX, -0.43% has gained 7.3% the past three months. Among shares of other aluminum companies see premarket activity, Century Aluminum Co. CENX, +3.03% rallied 2.3%, Kaiser Aluminum Corp. KALU, +1.18% and Arconic Corp. ARNC, +5.73% edged up 0.1%. Guinea is a global supplier of bauxite, which is used in manufacturing aluminum. A faction of Guinea’s military said over the weekend that the country’s constitution had been suspended and President Alpha Conde had been detained.
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