Ciena 4: Kosaraju Sheela sold 2,101 shares at $355.19 on 2026-10-01 (Oct 6, 2026)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-10-01 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: CIENA CORP (CIEN) CIK: 0000936395 --- Reporting Owner --- Name: Kosaraju Sheela CIK: 0001963781 Role: Officer (EVP & Chief Legal Officer) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-10-01 | Code: S (Open market sale) Shares: -2,101 | Price: $355.19 Total Value: $746,254.19 Shares Owned After: 84,065 | Ownership: D (Direct) Footnotes: [F1] Sales were effected pursuant to Rule 10b5-1 trading plan dated 10/14/2024. [F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs). --- Footnotes (Complete Index) --- F1: Sales were effected pursuant to Rule 10b5-1 trading plan dated 10/14/2024. F2: Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs). --- Signature --- /s/ By: Michelle Rankin For: Sheela Kosaraju (2026-10-02)