September 26, 202615 min readCiena FY2026 Q3 Earnings: $1.67B Revenue (+37%) and Two Cloud Customers Buying 41.7% of ItCiena's Q3 FY2026 revenue rose 37% to $1.671B and operating margin hit 18%, but two unnamed cloud providers bought 41.7% of it — $696M in one quarter.Mike Thriftcienaopen-ledgerfinancial-analysis