Ciena

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-04-15 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: CIENA CORP (CIEN) CIK: 0000936395 --- Reporting Owner --- Name: DiPerna Dino CIK: 0001998460 Role: Officer (SVP Global R&D) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-04-15 | Code: S (Open market sale) Shares: -1,322 | Price: $471.79 Total Value: $623,706.38 Shares Owned After: 43,967 | Ownership: D (Direct) Footnotes: [F1] Sales were effected pursuant to Rule 10b5-1 trading plan dated 7/11/2025. [F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs). [Transaction #2] Security: Common Stock Date: 2026-04-15 | Code: S (Open market sale) Shares: -1,507 | Price: $471.79 Total Value: $710,987.53 Shares Owned After: 42,460 | Ownership: D (Direct) Footnotes: [F1] Sales were effected pursuant to Rule 10b5-1 trading plan dated 7/11/2025. [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 7/11/2025. F2: Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs). --- Signature --- /s/ By: Michelle Rankin For: Dino Diperna (2026-04-16)