BlackRock, Inc. - Nov 30, 2025 SCHEDULE 13G/A Report for CIENA CORPORATION Common Stock (CIEN)

Filing Manager: BlackRock, Inc.
Reporting Manager: BlackRock, Inc.
Security: CIENA CORPORATION Common Stock
Symbol: CIEN
Shares outstanding: 141M shares
Disclosed Ownership: 14.5M shares
Ownership: 10.3%
Form type: SCHEDULE 13G/A
Date filed: 12/4/2025, 02:24 PM
Date of event: Nov 30, 2025
Previous filing: Apr 17, 2025
SEC: View on sec.gov

Reporting Managers (1)

Name	Ownership	Shares Owned	sole voting power	shared voting power	Signature	Title	CIK
BlackRock, Inc.	10.3%	14.5M	13.7M	0	Spencer Fleming	Managing Director