max(own FY2025 operating margin 4.1%, semis/optical cohort median 18.45%) - the cohort median binds. Named as a GENEROUS assumption: it grants Ciena a terminal margin 4.5x its FY2025 GAAP level and above the ~19% ADJUSTED margin the FY2026 guide implies, which the company has never achieved. CIEN_Trade_Construction.md s3A.
Risk & exit
Four distinct questions, one field each. A price is not a thesis: the trigger below forces a re-underwrite and freezes further purchases — it is never an automatic sell.
Risk trigger 24% below the memo price
$265.72
Forward E[R] vs a 0% floor
+18.5%
A daily close below $265.72 triggers a mandatory re-underwrite and freezes further purchases. It is not an automatic sell unless a separate fundamental invalidation condition has been breached.
Thesis-invalidation conditions
Fundamental and falsifiable, never price-based. If one is satisfied the thesis is marked dead and the position is retained only by explicit decision.
FQ3-26 10-Q (early Sept 2026) shows RPO ≥ $3.4bn — i.e. coverage restored toward ~40%+ on a backlog of ~$8.5bn. The mechanism would be wrong on the company's own audited number. This is the single cleanest refutation on the calendar.
Ciena reinstates a quantified backlog disclosure in the FY2026 10-K (Dec 2026) with a definition, a >1yr split and coverage above 55%. Disclosure-withdrawal leg fails. FY2026
FY2027 revenue guidance at or above $8.5bn issued in December 2026 *and* accompanied by an RPO figure above $3.5bn. Consensus Criteria variant is wrong. FY2027
A confirmed daily close above $474.33 (bull-case target).
Big-four hyperscaler 2027 capex guidance aggregating above $1.0trn with explicit optical/DCI commitments — the demand leg of the bear case fails.
Cloud provider A revenue concentration falls below 15% while total revenue still grows >25% — would show the base broadening and remove the concentration leg.
Impairment case
Not stated. No permanent-loss case with a named cause is on file. A valuation bear case is not an impairment case.