Corning Incorporated (NYSE:GLW) delivered rapid optical growth on July 28, then suffered a share-price decline of more than 20% after its guidance fell short of elevated expectations. Coherent Corp. (NYSE:COHR) also traded sharply lower. Coherent belongs in this story for a specific reason: the two companies monetize different components of the same AI data-center links.
Corning Incorporated (NYSE:GLW) supplies the passive layer, including optical fiber, cable and dense connector systems. Coherent supplies active devices and modules, including lasers, photodiodes and 800G and 1.6T transceivers that convert electrical signals into light and back again. As clusters add accelerators, network builders need both more fiber paths and faster optical endpoints. Corning's order pace can therefore provide a partial read-through on the volume and timing of deployments that create transceiver demand for Coherent Corp. (NYSE:COHR). It cannot establish Coherent's market share, pricing or margins.
Corning reported second-quarter core sales of $4.74 billion, up 17% year over year, and core earnings of $0.78 a share, up 30%. Optical Communications sales increased 32% to $2.07 billion. Within that segment, Enterprise Networks grew 65%, and the company said generative-AI product sales grew significantly faster.
The disappointment came from the next quarter. Corning projected $4.9 billion to $5.0 billion of third-quarter core sales, about 16% year-over-year growth but slightly below Wall Street's expectation, according to Reuters. Optical growth also eased from 36% in the first quarter to 32% in the second. Corning had gained roughly 64% in 2026 through the prior close, leaving little room for even modest deceleration.
Coherent's own latest quarter, ended March 31, argues against treating Corning's guidance as proof of weaker Coherent operations. Revenue rose 21% to $1.81 billion, GAAP gross margin reached 37.7%, and management cited exceptionally strong data-center and communications demand while expanding capacity. Its product roadmap includes 1.6T transceivers, lasers and photodiodes for AI networks. Different customer mixes, active-component content and manufacturing yields can make its results diverge from Corning's.
#corning #optical
Corning Incorporated (NYSE:GLW) supplies the passive layer, including optical fiber, cable and dense connector systems. Coherent supplies active devices and modules, including lasers, photodiodes and 800G and 1.6T transceivers that convert electrical signals into light and back again. As clusters add accelerators, network builders need both more fiber paths and faster optical endpoints. Corning's order pace can therefore provide a partial read-through on the volume and timing of deployments that create transceiver demand for Coherent Corp. (NYSE:COHR). It cannot establish Coherent's market share, pricing or margins.
Corning reported second-quarter core sales of $4.74 billion, up 17% year over year, and core earnings of $0.78 a share, up 30%. Optical Communications sales increased 32% to $2.07 billion. Within that segment, Enterprise Networks grew 65%, and the company said generative-AI product sales grew significantly faster.
The disappointment came from the next quarter. Corning projected $4.9 billion to $5.0 billion of third-quarter core sales, about 16% year-over-year growth but slightly below Wall Street's expectation, according to Reuters. Optical growth also eased from 36% in the first quarter to 32% in the second. Corning had gained roughly 64% in 2026 through the prior close, leaving little room for even modest deceleration.
Coherent's own latest quarter, ended March 31, argues against treating Corning's guidance as proof of weaker Coherent operations. Revenue rose 21% to $1.81 billion, GAAP gross margin reached 37.7%, and management cited exceptionally strong data-center and communications demand while expanding capacity. Its product roadmap includes 1.6T transceivers, lasers and photodiodes for AI networks. Different customer mixes, active-component content and manufacturing yields can make its results diverge from Corning's.
#corning #optical
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