Lumentum makes optical and photonic products including laser chips, optical sub-assemblies, transceivers, and optical circuit switching systems. Its customers are cloud service providers, network equipment manufacturers, and industrial companies. [S1][S2]
Sources through 2026-08-17 · Report dated 2026-09-11
Business details
How it makes money
The company sells components (66.5% of FY2026 revenue) and systems (33.5%), including 800G/1.6T transceivers and optical circuit switches. Revenue is volume-driven with pricing negotiated per contract. [S2][S10]
What drives results
Analysis: Hyperscaler AI capex drives demand for optical connectivity, which determines component and system volumes. [S1][S3]
Analysis: Manufacturing utilisation and product mix determine gross margin, which expanded to 50.4% non-GAAP in Q4 FY2026. [S2][S3]
Analysis: Capacity expansion at indium phosphide fabs and through contract manufacturers determines how much demand can be served. [S3]
Key dependencies
Two end customers represented 41.6% of FY2026 revenue, making hyperscaler demand highly concentrated. [S1]
Indium phosphide substrate supply is a critical input for laser chip production and remains tight. [S3]
Lumentum's AI-driven growth and margin expansion are real, but the market price embeds a scenario where current supply-constrained margins persist for years. The tension is whether this is a structural re-rating or a cyclical peak.
Customer concentration: two customers represented 41.6% of FY2026 revenue, and both are hyperscalers whose capex plans are the demand engine. Loss or dual-sourcing by either would materially change the trajectory.
Lumentum makes laser chips, optical sub-assemblies, transceivers, and optical circuit switching systems. Components were 66.5% of FY2026 revenue and Systems 33.5%. Revenue is driven by AI data-centre buildouts, with 79.2% of sales outside the US.
At approximately $935 per share, the market embeds continued hypergrowth, sustained 50%+ gross margins, and a rapid path to $2bn+ quarterly revenue. This implies the company becomes a $15-20bn revenue, $5-6bn free-cash-flow business within a decade.
A valuation model that works backward from a share price to find combinations of growth, margins, and other assumptions consistent with that price.
In this report: Back-solving the current share price for required growth and margin assumptions shows the market is embedding a scenario that is possible but not probable, which is central to the hold rating.
Our assessment
The business is strong today but the valuation leaves no margin of safety. Base-case intrinsic value is approximately $1,100 per share, implying modest upside with severe downside risk in a bear case. I rate the stock a hold.
Hyperscaler AI capex determines demand for optical components and systems. A 10% change in capex could shift Lumentum revenue by 15-20% and operating income by 30%+.
Present-value estimates at the analysis date. The DCF uses an 11.5% WACC, 3% terminal growth, 21% tax rate, and 90M diluted shares. The forecast horizon is 5 years explicit plus terminal value. Stock-based compensation is treated as an expense.
Scenarios are conditional estimates, not promised returns.
Bear · USD 550.0000
AI capex decelerates and competitor capacity overshoots demand. Gross margin compresses to 38%, revenue growth slows to 15% by FY2028, and the multiple compresses. Intrinsic value falls to $550 per share.
AI capex remains robust through 2027. Lumentum executes on capacity, revenue reaches $6-7bn by FY2028, gross margin normalises to 45%, operating margin reaches 30%. Intrinsic value is $1,100 per share.
AI capex accelerates and Lumentum dominates OCS and high-power laser supply. Revenue reaches $10bn+ by FY2029 with gross margin sustained above 48%. Intrinsic value is $2,000 per share.
I could not verify the full 10-K segment note directly; segment revenue figures are from secondary summaries of the 10-K. Proxy statement details on executive compensation and insider ownership were not available. Credit ratings were not disclosed in accessible sources.