Coherent Corp. (NYSE:COHR), a maker of advanced optical components and laser systems for data centre and industrial applications, declined on June 23, 2026, as the broad AI optical networking selloff extended to all photonics and laser names across the technology sector.

Key Highlights

  • Coherent Corp. declined on June 23 as the broad AI optical networking and photonics sector sold off on hyperscaler AI spending concerns.
  • Coherent manufactures laser sources, optical components, networking transceivers, and compound semiconductor wafers serving data centre, telecommunications, and industrial markets.
  • The company's data centre transceiver business had become a significant revenue growth driver, linking it directly to AI infrastructure buildout demand.
  • No Coherent-specific product, customer, or financial news drove the session's decline.

 

Coherent Corp. (NYSE:COHR) declined on June 23, 2026, as a broad selloff in AI optical networking and photonics names extended to all companies providing components to the data centre optical connectivity supply chain.

Coherent, formerly known as II-VI Incorporated before its merger with Coherent Corp. in 2022, manufactures a broad portfolio of optical and photonic components including high-speed transceivers for data centre networking, compound semiconductor wafers for optical and power electronics, laser sources for materials processing, and optical components for telecommunications infrastructure.

The company's data centre transceiver business had grown substantially as AI cluster deployments accelerated, driving demand for high-speed 400G, 800G, and emerging 1.6T optical modules connecting servers within AI training and inference facilities. This linkage to AI infrastructure spending made Coherent susceptible to the same risk-off dynamics that affected other AI optical networking names on June 23.

The session's primary drivers were the 10% collapse in South Korea's Kospi, reports that Alphabet had lost two senior AI researchers raising AI spending sustainability concerns, and the roughly 3% decline in the Nasdaq-100. The Philadelphia Semiconductor Index fell nearly 8%, extending selling pressure across the entire optical and photonic component supply chain.

Coherent's broader portfolio, including its industrial laser business serving metal cutting and welding, and its telecommunications component business serving long-haul fibre infrastructure, provides some revenue diversification beyond pure AI data centre exposure, though not sufficient to fully insulate it from a day's concentrated selling in AI-related technology names.