Micron Technology and SK Hynix each crossed $1 trillion in market value this week as demand from artificial intelligence data centers lifted memory-chip shares. Micron briefly topped the threshold on Tuesday after its shares rose as much as 19.3%, its biggest intraday gain since 2011, following a UBS price-target increase; SK Hynix passed $1 trillion on Wednesday as its Seoul-listed shares closed 9.3% higher, valuing the company at 1,680 trillion won, or about $1.12 trillion. The rally put Mi...

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