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Coherent and Lumentum shares drop sharply as investors take profits before earnings reports.

Market News
10 Aug 2026
24/7 Wall Street
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Bearish
Coherent and Lumentum shares drop sharply as investors take profits before earnings reports.

Shares of Coherent and Lumentum fell 12% and 7% respectively after strong multi-week gains driven by AI optics demand and U.S. export restrictions on Chinese transceivers. The pullback is mainly profit-taking and caution ahead of their upcoming fiscal Q4 2026 earnings reports on August 11 and 12. Valuations are very high, with P/E ratios above 140, pricing in strong growth tied to NVIDIA's AI data center expansion. Investors are watching these earnings closely for signs of sustained AI spending or potential supply-chain risks. Other optics players like Applied Optoelectronics, which already reported earnings, saw less impact. The broader semiconductor sector remains relatively stable, indicating the sell-off is optics-specific rather than a general chip market decline.

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