The leading producer of aluminum is the supplier to global companies that make aircraft, automobiles, and transportation systems.
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A Fortune investigation reveals sophisticated—and often controversial—tactics that have made Elliott Management the world's biggest, most successful activist hedge fund.
Company says it wasn't responsible for the decision to use them.
The company supplied combustible cladding for use at Grenfell Tower.
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The activist hedge fund said the letter "read as a threat to intimidate or extort a senior officer."