Marvell, Lumentum, AXT and Coherent were down double digits following the Corning print.
Investors are growing uneasy about increasing competition from China in the global race to dominate artificial intelligence.
SK Hynix is just the latest US stock-market entrant to stumble after a hot debut.
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Software stocks surge up to 10% as new GPT-5.6 government rules ease AI disruption fears. Discover how regulatory changes boost market confidence today.