144 0001032553 XXXXXXXX LIVE 0000936395 Ciena Corporation 001-36250 7035 Ridge Road Hanover MD 21076 1-410-694-5700 Gary B. Smith Officer Common Stock Goldman Sachs & Co. LLC 200 West Street New York NY 10282 40800 3370488 141367218 07/15/2025 NYSE Common Stock 03/20/2023 Acquired as compensation -- Restricted Stock Units Issuer N 1299 03/20/2023 Compensation Common Stock 06/20/2023 Acquired as compensation -- Restricted Stock Units Issuer N 10043 06/20/2023 Compensation Common Stock 09/20/2023 Acquired as compensation -- Restricted Stock Units Issuer N 9917 09/20/2023 Compensation Common Stock 12/20/2023 Acquired as compensation -- Restricted Stock Units Issuer N 4882 12/20/2023 Compensation Common Stock 12/20/2023 Acquired as compensation -- Restricted Stock Units Issuer N 14659 12/20/2023 Compensation N Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 07/01/2025 3400 274526.54 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 07/01/2025 3400 271882.36 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 05/15/2025 3400 272224.74 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 05/01/2025 3400 245316.46 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 06/16/2025 3400 251143.72 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 06/02/2025 3400 272096.56 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 04/15/2025 3400 201895.06 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 06/16/2025 3400 253314.62 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 04/15/2025 3400 202976.6 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 06/02/2025 3400 276106.18 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 05/15/2025 3400 271027.26 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 05/01/2025 3400 243620.88 The sales of shares set forth herein are made in connection with a selling plan dated September 11, 2024 that is intended to comply with Rule 10b5-1(c). 07/15/2025 09/11/2024 Goldman Sachs & Co. LLC on behalf of Gary B. Smith