Corning tumbles 16% after earnings, leading rout in optical stocks

Corning plunged 16% Tuesday following its second-quarter earnings report, triggering a broader selloff across optical component stocks tied to the artificial intelligence infrastructure build-out. The glassware maker's miss pulled down Marvell, Lumentum, AXT, and Coherent, each falling by double-digit percentages in sympathy.

The optical sector had rallied heading into earnings season on expectations that AI data center demand would drive accelerating orders for components. Corning's results suggest that narrative may be under pressure, at least in the near term. The company's optical communications segment has been a focus for investors betting on fiber optic cable and specialty glass demand from hyperscalers expanding GPU clusters.

The contagion effect hit chip designer Marvell and laser component makers Lumentum and Coherent hardest, reflecting how tightly grouped sentiment has become around AI infrastructure plays. AXT, which supplies substrate materials for optical components, also dropped sharply despite no company-specific news.