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 17712 8426661.12 141398427 04/15/2026 NYSE Common Stock 12/20/2024 Acquired as compensation -- Restricted Stock Units Issuer N 17712 12/20/2024 Compensation N Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 02/02/2026 1476 387909.77 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 02/02/2026 1476 396146.74 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 03/02/2026 1476 519986.53 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 03/16/2026 1476 526194.44 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 03/16/2026 1476 535130.15 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 01/15/2026 1497 368114.25 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 01/15/2026 1496 373094.92 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 04/01/2026 1476 616929.48 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 04/01/2026 1476 609660.91 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 03/02/2026 1476 526906.61 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 02/17/2026 1476 448308.58 Gary B. Smith 7035 Ridge Road Hanover MD 21076 Common Stock 02/17/2026 1476 435848.63 The sales of shares set forth herein are made in connection with a selling plan dated October 4, 2025 that is intended to comply with Rule 10b5-1(c). 04/15/2026 10/04/2025 Goldman Sachs & Co. LLC on behalf of Gary B. Smith