BlackRock, Inc. - 30 Nov 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: 141,144,796 shares
Disclosed Ownership: 14,537,914 shares
Ownership: 10.3%
Form type: SCHEDULE 13G/A
Filing time: 04 Dec 2025, 14:24:57 UTC
Date of event: 30 Nov 2025
Previous filing: 17 Apr 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%	14,537,914	13,714,981	0	Spencer Fleming	Managing Director