Coherent's $2.57 Billion Surge Propels It to Top 28 in Active Trading as AI-Driven Optical Tech Sparks Demand

Market Snapshot

Coherent (COHR) surged 4.64% on March 18, 2026, with a trading volume of $2.57 billion, marking a 38.95% increase from the prior day. This performance placed the stock among the top 28 most actively traded equities, reflecting heightened investor interest driven by strategic announcements and industry momentum. The stock’s intraday price action aligned with broader market enthusiasm for optical technology, fueled by Coherent’s showcase at the Optical Fiber Communication Conference (OFC 2026) and its positioning in AI-driven infrastructure.

Key Drivers

Coherent’s stock rally was primarily propelled by its showcase of advanced Indium Phosphide (InP) technologies and co-packaged optics (CPO) solutions at OFC 2026. The company demonstrated a broad portfolio, including 400 mW continuous-wave (CW) lasers for CPO, 200G electro-absorption modulated lasers (EMLs) for 1.6T transceivers, and high-speed photodiodes, underscoring its leadership in next-generation optical interconnects. These innovations, critical for AI data centers, addressed surging demand for higher bandwidth and energy efficiency, reinforcing Coherent’s role in enabling scalable infrastructure.

A second key driver was the sector-wide optimism around AI-driven demand for optical components. Multiple OFC 2026 presentations highlighted the transition from legacy electrical interconnects to optics, with Coherent estimating a $20 billion expansion in its serviceable addressable market (SAM) by 2030. The company’s roadmap for CPO, including 400G/lane and multi-rail solutions, positioned it to capitalize on AI infrastructure growth. Analysts noted that indium phosphide lasers, central to high-performance connectivity, are already sold out through 2027, signaling robust near-term demand.

Strategic partnerships further bolstered investor sentiment. Coherent’s $2 billion purchase agreements with Nvidia, announced earlier in March, solidified its integration into the AI infrastructure supply chain. These agreements, coupled with future capacity rights, aligned the firm with Nvidia’s next-generation AI hardware requirements. While Nvidia’s CEO, Jensen Huang, emphasized a dual approach combining copper and optical links, the emphasis on optics for high-speed data centers amplified Coherent’s relevance. The company’s manufacturing expansion, including increased InP production across facilities in Sweden, the U.S., and Switzerland, reinforced supply continuity and scalability.

Analyst ratings and market visibility also contributed to the upward momentum. Coherent’s inclusion in the S&P 500 index enhanced its profile, attracting index fund inflows and improving liquidity. TD Cowen’s “Buy” rating, with a $330 price target, underscored confidence in the company’s ability to navigate AI infrastructure growth. Additionally, Coherent’s participation in OFC 2026 as a key innovator—demonstrating quantum-safe networks and multi-terabit transceivers—highlighted its thought leadership, further validating its strategic direction.

The stock’s performance was also influenced by broader industry dynamics. Competitors like Lumentum and Applied Optoelectronics (AAOI) saw gains, reflecting sector-wide optimism. However, Coherent’s diversified approach across silicon photonics, VCSELs, and InP technologies distinguished it as a comprehensive solution provider. The company’s focus on both scale-out and scale-up architectures, alongside its emphasis on thermal management innovations, addressed multifaceted challenges in AI data centers. This technological breadth, combined with strategic manufacturing investments, positioned Coherent to outperform peers in a rapidly evolving market.

Finally, forward-looking guidance and order visibility provided additional catalysts. Coherent highlighted a growing backlog for optical circuit switches and co-packaged optics, with deliveries expected in the first half of 2027. These near-term revenue streams, alongside long-term TAM expansion, justified investor optimism despite risks around cost reductions and adoption timelines. The stock’s 7.28% intraday surge on March 18, exceeding its 4.64% official close, reflected a blend of immediate earnings potential and long-term growth prospects.