Coherent (COHR) Q3 2026 earnings review
AI Boom Powers Accelerating Revenue and Margin Expansion
Coherent's Q3 results demonstrate a company successfully capitalizing on the AI infrastructure buildout. Revenue accelerated to $1.81B (+21% YoY), handily driven by the Datacenter & Communications segment, which now accounts for 75% of total sales. Scale and operational leverage are shining through: Non-GAAP Gross Margin expanded 105 bps YoY to 39.6%, and Non-GAAP EPS surged 55% to $1.41. While the Industrial segment continues a stable, secular decline, the sheer force of datacenter demand and Q4 guidance pointing to further acceleration ($1.98B midpoint) paints a highly constructive picture.
🐂 Bull Case
The Datacenter & Communications segment is seeing extraordinary pull for 800G and 1.6T transceivers, with Q3 revenue hitting $1.36B. Forward bookings and long-term customer forecasts provide multi-year visibility.
Operating leverage is accelerating. Non-GAAP Operating Margin hit 20.3% in Q3, up from 18.6% a year ago, driven by cost reductions, yield improvements, and the early benefits of the 6-inch Indium Phosphide (InP) manufacturing ramp.
🐻 Bear Case
The Industrial business continues to shrink, dropping to $444M in Q3 from $529M a year ago. Macroeconomic weakness and delayed semi-cap recovery are masking some of the AI upside.
The company's growth hinges entirely on its ability to rapidly scale complex manufacturing, specifically doubling 6-inch InP capacity by calendar year-end. Any yield issues or supply chain bottlenecks could derail the growth narrative.
⚖️ Verdict: 🟢
Bullish. Coherent is transforming into a pure-play AI networking compounder. The margin expansion proves management can scale profitably, making the lagging Industrial segment an acceptable, albeit frustrating, passenger.
Key Themes
Datacenter Transceivers: The Primary Growth Engine
The transition to 800G and 1.6T pluggable transceivers is accelerating. Datacenter & Communications segment revenue surged to $1.36B in Q3, up from $969M a year ago. Management cited an exceptionally strong book-to-bill ratio in recent quarters, securing long-term supply agreements that extend into 2028. This mix shift is also margin-accretive.
6-Inch Indium Phosphide (InP) Ramp as a Moat
Coherent's vertical integration is paying off. The company is actively ramping its U.S. and Sweden-based 6-inch InP wafer production. Producing over 4x the chips at less than half the cost of 3-inch wafers, this platform is a stable driver of gross margin expansion and provides a critical supply chain advantage over fabless competitors.
Industrial Market Weakness is Reversing Total Growth Potential
Despite the AI halo, Coherent is carrying dead weight. The Industrial segment reported $444M in Q3, marking a steady deceleration from $529M in 25Q3 (-16% YoY). This segment now accounts for just 25% of revenue (down from 35%), driven by macroeconomic softness and a sluggish semiconductor capital equipment recovery.
Portfolio Optimization De-risking the Balance Sheet
Management continues to actively shed non-core, low-margin assets. Following the sale of the Aerospace & Defense unit, Coherent completed the sale of its Munich tools business in late January 2026. This strategy is immediately accretive to gross margins and is generating cash to aggressively pay down debt, reducing interest expense.
Persistent Supply-Demand Imbalance
The explosive demand for optical networking components creates a double-edged sword. Management has previously noted that Q1 Datacenter revenue was constrained by the supply of InP lasers. While internal capacity is doubling, any hiccups in the Malaysia or Vietnam transceiver assembly facilities could bottleneck revenue recognition.
Data Center Interconnect (DCI) Momentum
While intra-datacenter transceivers get the spotlight, Coherent is seeing accelerating demand for connecting discrete data centers. Growth in 100G, 400G, and 800G ZR/ZR+ coherent transceivers is providing a robust secondary tailwind for the Communications portfolio.
Other KPIs
Stable and accelerating. Up 57 bps sequentially and 105 bps YoY. Driven by favorable mix shift toward 800G/1.6T transceivers, yield improvements on 6-inch InP, and the divestiture of lower-margin businesses. The company is steadily marching toward its >42% long-term target.
Operating leverage is highly visible. While absolute non-GAAP OpEx increased 17% YoY to fund R&D for next-gen products, it fell as a percentage of revenue from 19.8% in 25Q3 to 19.3% in 26Q3. SG&A as a percentage of revenue improved by over 100 bps YoY.
A massive reversal from $503.3 million in the prior-year period. This dramatic drop is largely due to immense working capital requirements (inventory ballooned to $2.12B to support the AI ramp) and a rapid acceleration in capital expenditures to build out manufacturing capacity.
Guidance
Accelerating. The midpoint of $1.98 billion implies sequential growth of roughly 10% and represents massive year-over-year acceleration as AI datacenter capacity comes online.
Accelerating. The midpoint of 40.0% crosses a psychological threshold and indicates that the 6-inch InP wafer economics and 1.6T transceiver ASPs are fundamentally raising the margin floor.
Accelerating. The midpoint of $1.62 represents a 15% sequential jump from Q3, showcasing the potent combination of high-margin revenue growth and strict SG&A cost control.
Key Questions
Trajectory of the Industrial Segment
With the Industrial segment continuing to decline YoY and sequentially, what specific macro or semi-cap indicators do you need to see for this segment to bottom, and are there any further divestitures planned here?
Margin Profile of 1.6T vs 800G
As 1.6T transceivers become a larger portion of the Datacenter mix in the second half of the calendar year, how does their gross margin profile compare to mature 800G products, and how much of that is dependent on internal 6-inch InP yields?
Cash Flow Dynamics
Year-to-date operating cash flow dropped significantly compared to last year, driven by inventory builds. At what point in the capacity expansion cycle do you expect working capital requirements to normalize and free cash flow generation to inflect positively?