CIENA Corp SVP David Rothenstein Stock Dispositions for Tax Withholding

This Form 4 filing reports multiple stock dispositions by David M. Rothenstein, Senior Vice President and Chief Strategy Officer of CIENA Corporation. On December 20, 2025, Rothenstein disposed of a total of 16,708 shares of CIENA common stock through nine separate transactions, all at a price of $230.34 per share. The dispositions were made to cover tax liabilities associated with various equity awards, including restricted stock units (RSUs), performance stock units (PSUs), and market stock units (MSUs) granted between 2021 and 2024. These transactions represent tax withholding obligations rather than voluntary sales. Following these dispositions, Rothenstein's direct ownership decreased to 204,694 shares, which includes unvested RSUs and PSUs. The filing was signed by Michelle Rankin on behalf of David Rothenstein on December 22, 2025.