Form 4 Filing for CIENA CORP

On September 20, 2026, Sheela Kosaraju, EVP & Chief Legal Officer of CIENA CORP, reported the disposition of 156 shares of Common Stock at a price of $348.8 per share. This transaction was part of covering tax liabilities related to a restricted stock unit (RSU) award agreement dated 12/13/2022. Following this, Kosaraju disposed of an additional 691 shares of Common Stock at the same price, also to cover tax liabilities from an RSU award agreement dated 2/1/2023. Further dispositions included 549 shares (related to an RSU award agreement dated 12/12/2023), 330 shares (related to an RSU award agreement dated 12/17/2024), and 189 shares (related to an RSU award agreement dated 12/16/2025), all at $348.8 per share. These transactions were part of covering tax liabilities associated with the respective RSU award agreements. Shares reported include unvested RSUs and PSUs. The total post-transaction shares owned are 86,166.