Key facts
- BlackRock, Inc. filed SCHEDULE 13G/A for CIENA CORPORATION Common Stock (CIEN).
- Disclosed ownership: 10%.
- Date of event: 30 Nov 2025.
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%
- 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
- Next filing
- 24 Apr 2026
- SEC
- View on sec.gov
Key filing fact
BlackRock, Inc. disclosed 10% ownership in CIENA CORPORATION Common Stock (CIEN) on 30 Nov 2025.
Change
- Previous schedule filing date: 17 Apr 2025.
- Current filing was accepted on 04 Dec 2025, 14:24.
Research use
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting persons
Reporting managers (1)
Names, ownership, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 10% | 14,537,914 | 13,714,981 | 0 | Spencer Fleming | Managing Director |
CIK / CUSIP context first