Ciena Corp
CIEN- Exchange
- NYSE
- Industry
- Telephone & Telegraph Apparatus
- SEC CIK
- 0000936395
In the last 90 days, Ciena Corp insiders filed 0 open-market purchases and 20 sales; 1,227 institutions reported holding it in 13F filings for Q2 2026, worth $64.6B in total; no superinvestor holds it.
Holders of 5% or more of CIEN
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Ciena Corp, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| BlackRock, Inc. | 13G/A | 9.40%13.4M shares | – | Apr 17, 20251 filing | Apr 17, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
1 Schedule 13D or 13G filing on Ciena Corp, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Dec 4, 20252:24 PM ET | BlackRock, Inc. | 13G/A | 10.30%14.5M shares | +0.90 ppfrom 9.40% | Nov 30, 2025 | SEC |
| Apr 17, 20259:35 AM ET | BlackRock, Inc. | 13G/A | 9.40%13.4M shares | – | Mar 31, 2025 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Ciena Corp shares.
No Form 144 notices for Ciena Corp are on file.