Ciena

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2025-12-20 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: CIENA CORP (CIEN) CIK: 0000936395 --- Reporting Owner --- Name: Rothenstein David M CIK: 0001444157 Role: Officer (SVP and Chief Strategy Officer) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2025-12-20 | Code: F (Payment of exercise/tax) Shares: -679 | Price: $230.34 Total Value: $156,400.86 Shares Owned After: 220,733 | 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 12/13/2022. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 12/15/2022. [F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs). [Transaction #2] Security: Common Stock Date: 2025-12-20 | Code: F (Payment of exercise/tax) Shares: -204 | Price: $230.34 Total Value: $46,989.36 Shares Owned After: 220,529 | 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 12/13/2022. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 12/15/2022. [F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs). [Transaction #3] Security: Common Stock Date: 2025-12-20 | Code: F (Payment of exercise/tax) Shares: -811 | Price: $230.34 Total Value: $186,805.74 Shares Owned After: 219,718 | Ownership: D (Direct) Footnotes: [F3] Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a restricted stock unit (RSU) award agreement dated 12/12/2023. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 12/14/2023. [F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs). [Transaction #4] Security: Common Stock Date: 2025-12-20 | Code: F (Payment of exercise/tax) Shares: -436 | Price: $230.34 Total Value: $100,428.24 Shares Owned After: 219,282 | Ownership: D (Direct) Footnotes: [F4] Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a restricted stock unit (RSU) award agreement dated 12/17/2024. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 12/19/2024. [F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs). [Transaction #5] Security: Common Stock Date: 2025-12-20 | Code: F (Payment of exercise/tax) Shares: -439 | Price: $230.34 Total Value: $101,119.26 Shares Owned After: 218,843 | Ownership: D (Direct) Footnotes: [F5] Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a restricted stock unit (RSU) award agreement dated 12/14/2021. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 12/16/2021. [F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs). [Transaction #6] Security: Common Stock Date: 2025-12-20 | Code: F (Payment of exercise/tax) Shares: -8,682 | Price: $230.34 Total Value: $1,999,811.88 Shares Owned After: 210,161 | Ownership: D (Direct) Footnotes: [F6] Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a market stock unit (MSU) award agreement dated 12/13/2022. The earning of the MSU was previously reported on Table I of the reporting person's Form 4 filed on 12/18/2025. [F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs). [Transaction #7] Security: Common Stock Date: 2025-12-20 | Code: F (Payment of exercise/tax) Shares: -1,819 | Price: $230.34 Total Value: $418,988.46 Shares Owned After: 208,342 | Ownership: D (Direct) Footnotes: [F7] Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a performance stock unit (PSU) award agreement dated 12/17/2024. The earning of the PSU was previously reported on Table I of the reporting person's Form 4 filed on 12/18/2025. [F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs). [Transaction #8] Security: Common Stock Date: 2025-12-20 | Code: F (Payment of exercise/tax) Shares: -2,091 | Price: $230.34 Total Value: $481,640.94 Shares Owned After: 206,251 | Ownership: D (Direct) Footnotes: [F7] Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a performance stock unit (PSU) award agreement dated 12/17/2024. The earning of the PSU was previously reported on Table I of the reporting person's Form 4 filed on 12/18/2025. [F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs). [Transaction #9] Security: Common Stock Date: 2025-12-20 | Code: F (Payment of exercise/tax) Shares: -1,557 | Price: $230.34 Total Value: $358,639.38 Shares Owned After: 204,694 | Ownership: D (Direct) Footnotes: [F8] Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a performance stock unit (PSU) award agreement dated 12/12/2023. The earning of the PSU was previously reported on Table I of the reporting person's Form 4 filed on 12/19/2024. [F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs). --- 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 12/13/2022. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 12/15/2022. F2: Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs). F3: Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a restricted stock unit (RSU) award agreement dated 12/12/2023. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 12/14/2023. F4: Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a restricted stock unit (RSU) award agreement dated 12/17/2024. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 12/19/2024. F5: Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a restricted stock unit (RSU) award agreement dated 12/14/2021. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 12/16/2021. F6: Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a market stock unit (MSU) award agreement dated 12/13/2022. The earning of the MSU was previously reported on Table I of the reporting person's Form 4 filed on 12/18/2025. F7: Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a performance stock unit (PSU) award agreement dated 12/17/2024. The earning of the PSU was previously reported on Table I of the reporting person's Form 4 filed on 12/18/2025. F8: Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a performance stock unit (PSU) award agreement dated 12/12/2023. The earning of the PSU was previously reported on Table I of the reporting person's Form 4 filed on 12/19/2024. --- Signature --- /s/ By: Michelle Rankin For: David M Rothenstein (2025-12-22)