Why did Coherent stock fall on 8 October?
Written after the close on
Coherent −9.63%
Coherent fell sharply as AI-optics peers cooled. Over the last five trading days Coherent slipped slightly, even as the broad market rose clearly and the technology sector was roughly flat, so it lagged both. The weakness looks tied to a sharp pullback across photonics and optical-connectivity names — companies that make the lasers and optical parts moving data inside AI data centers — after a strong run; an upbeat report from peer Lumentum had earlier sparked a rally in the group, and Coherent's own results are due in early November. The drop was likely amplified by profit-taking after an analyst upgrade and a thermal-technology rally lifted the stock in the prior week. Watch the November earnings report and whether AI-driven optical demand keeps supporting the group.
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