Coherent Corp. (COHR) — 2026Q4 FY2026 Earnings Call Analysis

Sold Out Through a Single Wafer

They named indium phosphide as their only constraint, then delivered that constraint's doubling one quarter early.

Thesis: Coherent owns the physical bottleneck in AI optical interconnect: indium phosphide substrate supply. Every data center photon routes through their material. They're doubling that constraint one quarter ahead of plan while assembly/test sits idle, meaning the ramp unlocks revenue without proportional capex. Gross margin expanded 660bps over eight quarters on cost structure improvement alone. The bear case is concentration risk and declining incremental margins, neither of which has broken yet.

Verdict: LONG — Conviction: MEDIUM

Catalyst: Second doubling of indium phosphide capacity completes end of current quarter, unlocking transceiver revenue into idle assembly/test capacity. CPO revenue from Nvidia partnership ramps fiscal Q2. 1.6T OCS and PhotonLink platform expand content per rack.

Key Risk: Single-input constraint: if 6-inch InP yields slip or second doubling delays, the entire revenue acceleration thesis stalls. Anderson named InP as the sole constraint, so there is no other bottleneck absorbing a delay.

The Tell: CFO volunteered unprompted: 'once we get to our target of greater than 42%, we will no doubt raise the target.' This is a forward commitment beyond any current guidance. The Street is modeling a 42% ceiling and the CFO is telling you it is a floor. Nobody asked her to say that.

Detected Patterns

Beat and Raise Machine: Fiscal 2026: $7.12B revenue up 23%, Q4 accelerating to 34% YoY, non-GAAP EPS up 59%. Eight of nine quarters of sequential gross margin improvement. Guidance for $3B revenue quarter by end of FY2027 implies continued acceleration.
Bottleneck Removal Enabling Growth: 6-inch indium phosphide ramp delivered one quarter ahead of schedule. Yields exceeding 3-inch lines. Assembly/test capacity available and unbooked. The physical constraint is being removed on an accelerated timeline, directly enabling the revenue guide.
Backlog Fortress: FY2027 booked out, customer POs extending into calendar 2028, LTAs through end of decade with take-or-pay minimums and pricing commitments. Anderson confirmed take-or-pay explicitly: 'minimum demand guarantees from our customers.'
Margin Expansion Engine: Gross margin expanded 660bps cumulative over eight quarters on cost structure improvement (6-inch InP yields, pricing optimization) while opex dropped to 18.4% of revenue from 20.1% a year ago. Both lines moving in right direction simultaneously.
Capacity Ceiling: Named constraint is one material. Assembly and test capacity is idle and unbooked while InP is the bottleneck. If the second InP doubling slips, there is no other lever to pull.
Backlog Quality: Management never quantified what share of the 'booked out' fiscal 2027 backlog is protected by take-or-pay LTAs versus cancellable purchase orders. The distinction matters for downside protection.

Friction Level: MODERATE_FRICTION — Both sides agree on execution strength. The disagreement is whether 79% hyperscaler concentration and declining incremental margins (mid-40s to low-40s) justify premium pricing for growth or demand a discount for concentration risk.

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