BlackRock, Inc. - 31 Mar 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: 142,477,245 shares
Disclosed Ownership: 13,392,861 shares
Ownership: 9.4%
Form type: SCHEDULE 13G/A
Filing time: 17 Apr 2025, 09:35:36 UTC
Date of event: 31 Mar 2025
Next filing: 04 Dec 2025
SEC: View on sec.gov

Reporting Managers (1)

Name	Ownership	Shares Owned	sole voting power	shared voting power	Signature	Title	CIK
BlackRock, Inc.	9.4%	13,392,861	13,030,903	0	Spencer Fleming	Managing Director