Schedule 13G/A
CIEN Schedule 13G/A filing by BlackRock
BlackRock reported beneficial ownership of 16.3M shares, representing 11.3% of CIENA CORP in this filing.
FiledJan 30, 2024
Ownership dateDec 31, 2023
Reported shares16.3M
Reported ownership11.3%
Ownership details
Voting and dispositive power reported in the filing
These figures describe the reporting filer’s disclosed voting and investment authority. They should be read together with the reported share count and percentage.
Sole voting power
16.3M
Shared voting power
16.3M
Sole dispositive power
16.3M
Shared dispositive power
16.3M
Price context
Price dates alongside the ownership filing
Price data provides market context around the disclosure. It does not identify the filer’s actual transaction price.
Close near filing date—
Latest tracked price$417.01as of Aug 5, 2026
Source
Original filing and accession
Use the SEC filing as the primary source when you need the complete disclosure, footnotes, exhibits, or reporting-person details.
- Reporting filer
- BlackRock
- CIK
- CIK0001364742
- Accession
- 0001086364-24-005661
- Form
- Schedule 13G/A
Read the filing in context