Ciena Corp Officer Joseph Cumello Sells 11,556 Shares for Tax Withholding

This Form 4 filing discloses that Joseph Cumello, Senior Vice President and General Manager of Blue Planet at Ciena Corporation, disposed of 11,556 shares of common stock on December 20, 2025, through nine separate transactions at $230.34 per share. The sales were mandatory tax withholding transactions related to the vesting of various equity awards, including restricted stock units (RSUs), market stock units (MSUs), and performance stock units (PSUs) granted between 2021 and 2024. Following these dispositions, Cumello's total holdings decreased to 61,404 shares, which includes unvested RSUs and PSUs. The transactions were coded as "F" (tax withholding) and represent shares withheld to cover tax liabilities associated with previously reported equity awards. This filing provides transparency about executive compensation-related stock transactions required for tax compliance purposes.