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Micron Technology became a $400 billion company only a few weeks after topping a $300 billion valuation, as the largest U.S. maker of memory chips rides the artificial-intelligence boom.
Micron’s stock
MU rose more than 7% Friday to close at a record $362.75, pushing the company’s market capitalization to $408 billion, according to Dow Jones Market Data. Micron crossed $300 billion in market value on Dec. 22.
