SanDisk Rips 10%, Micron Rises 6% as AI Memory Frenzy Builds: Stock Market Today

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U.S. stocks drifted lower at midday Monday as a violent melt-up in AI optical and memory names collided with a bond market that refuses to settle down, leaving the S&P 500 a whisker below Friday’s close after last week’s record.

Across U.S. equity markets by midday Monday, losses were shallow but broad, with only three of eleven S&P 500 sectors holding gains.