Soitec (SOI.PA) — 2026Q4 FY2026 Earnings Call Analysis

Photonics Accelerating at 12% of Revenue, Core 85% Still Falling

They guided 15% growth for Q1 then immediately told analysts not to extrapolate it.

Thesis: Photonics-SOI is a genuine structural growth pocket with accelerating demand since March, LTAs forming, and operating leverage math that turns every EUR 100M of incremental revenue into EUR 50M of EBIT. But it covers 12-15% of revenue while the other 85% sits at 50% fab utilization in multi-year inventory correction with no end date. Capacity ceiling at 9-12 months and EUR 100M CapEx cap means you cannot monetize the AI demand fast enough. The stock is pricing the pocket while the trough persists.

Verdict: HOLD — Conviction: MEDIUM

Catalyst: Q1 FY2027 printing at or above the guided 15% organic growth rate, with photonics revenue crossing meaningfully past EUR 100M run-rate and RF-SOI customer inventory resuming depletion at 200-300K wafers per quarter.

Key Risk: Subsidy cliff plus FX. IPCEI II concludes in calendar 2026, FY2027 subsidies drop significantly, 180bps of gross margin relief disappears, and the 95% EUR/USD hedge locks in 1.19 when the euro is strengthening. Combined with 50% utilization, this compresses margins before photonics scale can compensate.

The Tell: Rémont volunteered that 'the shape of the curve has changed' on photonics demand, unprompted, then immediately hedged: 'I will not give you a firm number.' He sees something larger than he is willing to guide. Meanwhile he tells analysts 'you cannot extrapolate from Q1' on the 15% growth figure. Confident on photonics, defensive on everything else.

Detected Patterns

Inventory Divergence: Customers still hold approximately 2 million RF-SOI wafers. Prior depletion cadence was 200-300K per quarter. Q4 saw zero progress. CEO admits 'this will take several quarters for sure' while photonics demand accelerates, creating a split picture the market cannot reconcile.
Capacity Ceiling: Photonics demand accelerating but Pasir Ris not fully qualified. New capacity deployment takes 9-12 months. CapEx capped at EUR 100M with less than half allocated to capacity expansion. Management shipping tools from Singapore to Bernin to keep up, but cannot monetize AI demand at current speed.
Backlog Fortress: More than 10 customers in full production or qualification for photonics. LTAs being signed for both 200mm and 300mm. CEO asking customers to take long-term commitments. This is real commitment in the one segment that matters for the next AI leg.
Bottleneck Removal Enabling Growth: Asset fungibility lets them redirect idle 50% utilization capacity to photonics with minimal incremental CapEx. Pasir Ris qualification progressing with existing assets. Critical tools transferred Singapore to Bernin in two weeks. Low-capital path to scaling the growth platform.
AI Label Without Substance: CFO's own numbers show edge/cloud AI up just 8% year-on-year. Strategy team spent extensive time on EUR 700B hyperscaler CapEx and agentic AI slides, but AI-linked revenue is a minority of the portfolio. The narrative outruns the P&L.
Rising Customer Switching Costs: CTO cites 4,800 patents, Smart Cut toolbox, 30 years of RTO partnerships. Operations states it will take GlobalWafers 'a lot of time to get to the level which is required' for CPO. CEO acknowledges competition will come but frames the moat as execution depth.

Friction Level: MODERATE_FRICTION — Both sides agree photonics is real and accelerating. Disagreement is whether a EUR 100M platform growing 30% can offset a EUR 600M+ base declining 30-44% across mobile and auto/industrial, and whether operating leverage math matters before the top line actually turns.

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Photonics Accelerating at 12% of Revenue, Core 85% Still Falling | Silicon Signal