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Why optical stocks Lumentum and Coherent were the day’s biggest S&P 500 gainers

Reported by MarketWatch · Published 17 Sep 2026, 4:52 AM MYT (22 min ago)

Investors are looking further down the AI data-center supply chain for signs of demand amid concerns of a spending slowdown, one expert says.

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Why optical stocks Lumentum and Coherent were the day’s biggest S&P 500 gainers

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