CIENA CORP (CIEN) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-08-01 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: CIENA CORP (CIEN) CIK: 0000936395 --- Reporting Owner --- Name: Graff Marc D. CIK: 0002080157 Role: Officer (SVP & Chief Financial Officer) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-08-01 | Code: F (Payment of exercise/tax) Shares: -14,441 | Price: $377.05 Total Value: $5,444,979.05 Shares Owned After: 112,514 | Ownership: D (Direct) Footnotes: [F1] Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a restricted stock unit (RSU) award agreement dated 08/01/2025. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 8/05/2025. [F2] Shares reported include unvested Restricted Stock Units (RSUs). --- Footnotes (Complete Index) --- F1: Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a restricted stock unit (RSU) award agreement dated 08/01/2025. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 8/05/2025. F2: Shares reported include unvested Restricted Stock Units (RSUs). --- Signature --- /s/ By: Michelle Rankin For: Marc D Graff (2026-08-04)