NVIDIA made Coherent harder to ignore
- Coherent is now mainly an AI optical networking supplier, with Datacenter & Communications at about 75% of Q3 FY2026 revenue.
- The NVIDIA deal adds a multi-year purchase commitment and a $2 billion equity investment.
- Datacenter & Communications revenue grew 41% year over year in Q3 FY2026, up from 34% in Q2.
- Gross margin reached 38% in Q3 FY2026, helped by higher AI datacenter volumes.
- The bear case is concentration: the company is more tied to NVIDIA, AI spending, and a pricey growth story.
AI optics, now with NVIDIA backing
Coherent has become a major supplier of the physical parts that move data inside AI datacenters. Its optical transceivers and related components help servers send huge amounts of information at high speed. That is why the NVIDIA agreement matters so much. NVIDIA agreed to a multi-year, multi-billion-dollar purchase commitment and made a $2 billion equity investment.
The latest numbers support the bull case. In Q3 FY2026, Datacenter & Communications revenue was $1.362 billion, up 41% year over year. Total revenue was $1.806 billion, and gross margin rose to 38%. This shows that AI demand is flowing through the income statement, not only through press releases.
The hard part is that the good news also raises the risk. Coherent is now more exposed to one customer relationship and one spending cycle. If AI datacenter orders slow, if NVIDIA changes plans, or if new AI designs need fewer optical parts, growth could cool fast.
The stock also has a price question. Investors are already paying for a lot of AI success. For the next year, the key tests are simple: can Coherent ramp capacity for NVIDIA, keep Datacenter & Communications growth above 30%, hold gross margin near or above 38%, and get clarity on the BIS inquiry tied to past Huawei sales.
Hard parts made at scale
Coherent makes advanced materials, optical components, and lasers. Many of these products are hard to build because they need precise materials science, such as silicon carbide, gallium arsenide, and indium phosphide. That difficulty is part of the moat.
The company sells directly to large equipment makers, system builders, and end customers. In AI datacenters, its value comes from helping data move quickly between chips, servers, and racks. In industry, its lasers and materials help with manufacturing, displays, power electronics, and other specialized uses.
The model works best when factories run at high volume and yields improve. It can break when demand falls quickly, when a large customer cuts orders, or when Coherent has to spend heavily on capacity before the orders produce enough profit.
Starting in fiscal 2026, Coherent reports two segments: Datacenter & Communications and Industrial. That new structure makes the company easier to read, but it also makes the AI concentration more visible.
What Coherent sells
Datacenter optical transceivers
These pluggable modules move data through AI and cloud datacenters. They are the clearest driver of current growth.
Telecom optical components
Coherent sells fiber optics, pump lasers, amplifiers, and wavelength selective switches for land and submarine networks. This adds communications demand beyond AI datacenters.
Engineered materials
The company makes silicon carbide substrates, laser optics, and other specialty materials. These can serve EV power electronics, 5G radio parts, and industrial systems, but demand has been uneven.
Semiconductor lasers
Coherent sells high-power semiconductor lasers such as VCSELs and edge-emitting lasers. These feed into sensing, communications, and manufacturing uses.
Industrial and display lasers
The lasers business includes excimer, CO2, solid-state, and ultrafast lasers. These tools are used in OLED display production, precision manufacturing, research, and other industrial jobs.
Externally funded R&D
Coherent also earns revenue from funded research and development work. This can help support future products, but it is not the main profit engine.
A two-segment AI story
Mix is from Q3 FY2026, the quarter ended March 31, 2026. Datacenter & Communications was about 75% of revenue, so customer and AI-cycle concentration are now central to the story.
What could break the thesis
NVIDIA concentration
High impact · Medium oddsThe NVIDIA agreement gives Coherent a clearer demand runway, but it also likely raises customer concentration. If NVIDIA slows purchases, shifts designs, or pushes harder on price, Coherent could lose growth and margin at the same time.
AI buildout slowdown
High impact · Medium oddsCoherent is more exposed to the AI datacenter cycle than it was a year ago. Future AI software or hardware could require less computing power, which could lower demand for the optical gear that is driving growth today.
Margin and capex squeeze
High impact · Medium oddsThe NVIDIA ramp may require heavy spending on manufacturing capacity and research. If costs arrive before revenue, or if yields disappoint, the current 38% gross margin may not hold.
BIS inquiry on Huawei sales
Medium impact · Medium oddsCoherent disclosed a U.S. Bureau of Industry and Security inquiry in January 2025 tied to past Huawei sales. An adverse result could bring penalties or limits that hurt finances and investor trust.
Debt limits flexibility
Medium impact · Medium oddsCoherent still carried about $3.2 billion of debt as of March 31, 2026. Debt matters more if the cycle turns, because interest and repayment needs can limit spending on growth, restructuring, or buybacks.
Industrial keeps shrinking
Medium impact · Medium oddsIndustrial revenue fell 16% year over year in Q3 FY2026, partly because of divestitures. That makes the remaining company cleaner, but also less balanced if AI demand cools.
In one breath
Why is Coherent linked to AI?
AI datacenters need fast optical connections to move data between chips, servers, and racks. Coherent sells optical transceivers and related parts used in that network.
What did NVIDIA do with Coherent?
In March 2026, Coherent entered a multi-year strategic agreement with NVIDIA for advanced optics technology, manufacturing capacity, and research and development. NVIDIA also made a $2 billion equity investment.
Is Coherent only an AI company now?
No. It still sells industrial lasers, engineered materials, telecom parts, and specialty components. But in Q3 FY2026, Datacenter & Communications was about 75% of revenue, so AI and communications drive the main investment case.
What is the biggest risk for COHR stock?
The biggest risk is that expectations are high while the business is becoming more concentrated. A slowdown in AI datacenter spending, a weaker NVIDIA relationship, or lower margins could hurt the stock.