X0508 4 2025-12-20 0 0000936395 CIENA CORP CIEN 0001998460 DiPerna Dino C/O CIENA CORPORATION 7035 RIDGE RD. HANOVER MD 21076-1426 0 1 0 0 SVP Global R&D 0 Common Stock 2025-12-20 4 F 0 204 230.34 D 59550 D Common Stock 2025-12-20 4 F 0 444 230.34 D 59106 D Common Stock 2025-12-20 4 F 0 730 230.34 D 58376 D Common Stock 2025-12-20 4 F 0 428 230.34 D 57948 D Common Stock 2025-12-20 4 F 0 319 230.34 D 57629 D Common Stock 2025-12-20 4 F 0 1783 230.34 D 55846 D Common Stock 2025-12-20 4 F 0 2050 230.34 D 53796 D Common Stock 2025-12-20 4 F 0 1401 230.34 D 52395 D Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a restricted stock unit (RSU) award agreement dated 10/27/2023. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 10/31/2023. Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs). 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 3 filed on 10/31/2023. 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. 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. 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 3 filed on 10/31/2023. 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. 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. By: Michelle Rankin For: Dino DiPerna 2025-12-22