Coherent stock barely moved after earnings, slipping about 0.4% to roughly US$325 even though the company just closed out a record year in its core optical and data center business. The headline is simple: this was a profitability and margin story, not a trading day story.

Quarterly revenue reached about US$2.0b in Q4 with basic earnings per share of about US$1.23, capping roughly US$7.1b of sales and solid earnings over the past year. With the share price already carrying a rich trailing P/E, the focus now is on how durable that profit engine looks over the next few years.

Like Coherent’s earnings strength but unsure how to balance a rich P/E with margin resilience over time? Check out the list of solid balance sheet and fundamentals stocks (51 results).

Q4 2026 Earnings Summary

• Revenue, Q4 2026 vs. Q4 2025: US$2,045.5m vs. US$1,529.4m (up about 33.8%)
• Net Income, Q4 2026 vs. Q4 2025: US$240.5m vs. a loss of US$128.8m (moved from loss to profit)
• Basic EPS, Q4 2026 vs. Q4 2025: US$1.23 vs. a loss of US$0.83 per share (moved from loss to profit)
• Non GAAP Gross Margin, FY 2026 vs. FY 2025: 39.4% vs. 37.9% (up 1.5 percentage points)

Prefer clean charts over another wall of earnings tables and footnotes? See Coherent’s full visual breakdown, including how its valuation compares after this record year, in the company report for Coherent.

Coherent’s AI Optics Thesis Meets Key Execution Markers

Bulls argue Coherent is building a durable AI optics franchise, powered by higher speed transceivers and a scaled indium phosphide base that supports stronger margins. The latest year gives solid evidence that execution is tracking that script. Datacenter & Communications reached 79% of Q4 revenue with Q4 revenue growth of 59% in that segment and 19% sequential growth. That lines up directly with the idea that 800G and 1.6T optics are becoming the main engine of the business.

The margin story, central to the bullish case, also shows concrete milestones. Non GAAP gross margin for FY 2026 moved to 39.4% and Q4 landed at 40.2%, while non GAAP operating margin reached 20.5%. Management reports 6 inch indium phosphide yields ahead of the older 3 inch lines and plans to double internal output this quarter, one quarter earlier than originally targeted. That is exactly the kind of manufacturing progress the thesis required.

Compare Coherent’s yield gains and datacenter momentum with what Wall Street is actually pricing in. See the consensus price target analysis for Coherent

Coherent Bear Case: Capacity, Adoption And Volatility Risks

Bears worry Coherent is building too much capacity for an AI optics cycle that could cool, leaving fabs underused and margins exposed. This quarter does not settle that. Management is still talking about doubling indium phosphide output this quarter and planning further expansion, yet there is no revised view on what happens if hyperscaler AI capex slows or shifts architectures. Utilization and pricing sensitivity remain largely untested while demand is strong.

The second concern is that new architectures such as co packaged optics and optical circuit switching, where bears see adoption risk, are still mostly future tense. Management points to expected co packaged optics revenue starting in the December quarter and Thermadite thermal materials ramping in 2027. Those timelines do not refute the worry that high spend today may take years to earn through. The flat industrial segment also leaves less cushion if Datacenter & Communications growth cools.

After fresh capacity commitments and a recent share issuance, you might ask if these are isolated choices or part of a deeper risk pattern. Review our independent risk analysis for Coherent which shows 2 important warning signs

Own Your Next Investing Move

If Coherent’s record optical and datacenter year has your attention, register for free with Simply Wall St and add it to a Watchlist so you can track the share price against fair value and wait for a setup that matches your plan. When you decide to take a position, use the Portfolio Command Center to cut through noise and stay on top of the most important changes to your holdings. For long term conviction, tap into the Community to see how other investors are thinking through the same risks and catalysts. This way you spot potential catalysts and red flags earlier and stay a step ahead of the market.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.