Why optical stocks Lumentum and Coherent were the day’s biggest gainers

Why optical stocks Lumentum and Coherent were the day’s biggest S&P 500 gainers Why optical stocks Lumentum and Coherent were the day’s biggest S&P 500 gainers Investors are looking further down the AI data-center supply chain for signs of demand amid concerns of a spending slowdown, one expert says Lumentum’s stock was Wednesday’s best-performing S&P 500 component. /iStockphoto The Federal Reserve was no match for shares of optical-networking companies, which led S&P 500 gainers on Wednesday in the face of broad market weakness. closed up 9.6% and 6.9%, respectively. At minimum, the moves could be interpreted as part of a rebound from Monday’s selloff, which was fueled by concerns of a possible artificial-intelligence spending slowdown. Copyright ©2026 MarketWatch, Inc.

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