2024
Annual Shareholder Meeting

Ciena's 2024 Annual Meeting of Stockholders will be held on March 21, 2024 at 3:00 PM (Eastern). If you are a stockholder as of the January 22, 2024 record date for the Annual Meeting, you will be able to attend the Annual Meeting, vote your shares electronically and submit your questions during the live webcast of the meeting by entering the 16-digit control number included in your Notice of Internet Availability of Proxy Materials, your proxy card or the voting instructions that accompanied your proxy materials.

Pursuant to the "Notice and Access" rules adopted by the Securities and Exchange Commission (SEC), we have elected to provide access to our proxy materials over the Internet as an alternative to the traditional delivery of printed proxy materials. Accordingly, if you were a stockholder of Ciena common stock as of our January 22, 2024 record date, we sent you a Notice of Internet Availability of Proxy Materials. By following the instructions in the Notice, you may access our proxy materials on the website referred to in the Notice. The Notice also includes instructions on how to vote your shares and request printed copies of the proxy materials.

Whether you are a "stockholder of record" or hold your shares in "street name," you may direct your vote in advance of and without attending the Annual Meeting in person. If you were a stockholder as of the January 22, 2024 record date, you may vote your shares via the Internet by following the instruction included in your Notice of Internet Availability of Proxy Materials, your proxy card or the voting instructions that accompanied your proxy materials. To vote your shares via the Internet, you will need to have the control number set forth on your Notice. If you request printed copies of the proxy materials by mail, you may also vote by signing and submitting your proxy card and returning by mail or you can vote by telephone. All proxies properly submitted in time to be counted at the Annual Meeting will be voted in accordance with the recommendations of the Board of Directors.

If your shares are registered directly in your name with our transfer agent, Computershare Trust Company, N.A., you are considered the "stockholder of record" with respect to those shares, and the Notice was sent directly to you by mail on February 8, 2024. If your shares are held in an account at a brokerage firm, bank, broker-dealer, or other similar organization, then you are the beneficial owner of shares held in "street name," and the Notice was forwarded to you by that organization. As a beneficial owner, you have the right to direct that organization on how to vote the shares held in your account.