Micron Technology and SK Hynix each crossed $1 trillion in market value for the first time as investors bought memory-chip makers tied to artificial intelligence infrastructure. Micron shares surged 19% on Tuesday, lifting the U.S. memory-chip maker above the threshold, while SK Hynix rose in Seoul on Wednesday and joined Samsung Electronics among Asian chip companies valued at more than $1 trillion. The rally followed a UBS call that lifted Micron’s price target to $1,625 from $535, with ana...

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