Ciena CorporationSEC Filings
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All SEC filings by Ciena Corporation (CIEN) — annual and quarterly reports, current reports, registrations, proxies and ownership forms, updated in real time.
Financials
| 10-Q | Quarterly report | View Diff | Sep 3, 2026 | |
| 10-Q | Quarterly report | View Diff | Jun 4, 2026 | |
| 10-Q | Quarterly report | View Diff | Mar 5, 2026 | |
| ARS | Annual report to shareholders | Feb 12, 2026 | ||
| 10-K | Annual report | View Diff | Dec 12, 2025 | |
| 10-Q | Quarterly report | View Diff | Sep 4, 2025 | |
| 10-Q | Quarterly report | View Diff | Jun 5, 2025 | |
| 10-Q | Quarterly report | View Diff | Mar 12, 2025 | |
| ARS | Annual report to shareholders | Feb 13, 2025 | ||
| 10-K | Annual report | View Diff | Dec 20, 2024 |
Events
| 8-K | Ciena Reports Fiscal Third Quarter 2026 Financial Results | Sep 3, 2026 | ||
| 8-K | Current report | Jun 11, 2026 | ||
| 8-K | Current report | Jun 8, 2026 | ||
| 8-K | Current report | Jun 4, 2026 | ||
| 8-K | Submission of Matters to a Vote of Security Holders | Mar 31, 2026 | ||
| 8-K | Ciena Reports Fiscal First Quarter 2026 Financial Results | Mar 5, 2026 | ||
| 8-K | Ciena Reports Fiscal Fourth Quarter 2025 and Year-End Financial Results | Dec 11, 2025 | ||
| 8-K | Departure of Directors or Certain Officers | Dec 3, 2025 | ||
| 8-K | Other Events | Oct 7, 2025 | ||
| 8-K | Ciena to Acquire Nubis Communications to Expand Its Inside the Data Center Strategy and Further Address Growing Ai Workloads | Sep 22, 2025 |
Registrations and Prospectuses
| S-8 | Registration of securities for employees | Apr 18, 2024 | ||
| S-8 | Registration of securities for employees | Apr 21, 2021 | ||
| S-8 | Registration of securities for employees | Apr 14, 2020 | ||
| 425 | Business combination disclosure | Aug 2, 2017 | ||
| SC TO-I/A | Issuer tender offer statement | Jul 31, 2017 | ||
| 424B3 | Prospectus supplement | Jul 28, 2017 | ||
| S-4/A | Registration of securities issued in business combination transactions | View Diff | Jul 14, 2017 | |
| SC TO-I/A | Issuer tender offer statement | Jul 14, 2017 | ||
| S-4/A | Registration of securities issued in business combination transactions | View Diff | Jun 30, 2017 | |
| 425 | Business combination disclosure | Jun 30, 2017 |
Proxies
| DEFA14A | Additional proxy soliciting materials | Feb 12, 2026 | ||
| DEF 14A | Definitive proxy | View Diff | Feb 12, 2026 | |
| DEFA14A | Additional proxy soliciting materials | Feb 13, 2025 | ||
| DEF 14A | Definitive proxy | View Diff | Feb 13, 2025 | |
| DEFA14A | Additional proxy soliciting materials | Feb 8, 2024 | ||
| DEF 14A | Definitive proxy | View Diff | Feb 8, 2024 | |
| PRE 14A | Preliminary proxy | Jan 29, 2024 | ||
| DEFA14A | Additional proxy soliciting materials | Mar 3, 2023 | ||
| DEFA14A | Additional proxy soliciting materials | Feb 16, 2023 | ||
| DEF 14A | Definitive proxy | View Diff | Feb 16, 2023 |
Other
| SD | Conflict minerals disclosure | May 28, 2026 | ||
| SD | Conflict minerals disclosure | May 30, 2025 | ||
| SD | Conflict minerals disclosure | May 30, 2024 | ||
| SD | Conflict minerals disclosure | May 31, 2023 | ||
| SD | Conflict minerals disclosure | May 31, 2022 | ||
| SD | Conflict minerals disclosure | May 28, 2021 | ||
| SD | Conflict minerals disclosure | May 29, 2020 | ||
| UPLOAD | Letter from SEC | Apr 27, 2020 | ||
| CORRESP | Correspondence with SEC | Apr 23, 2020 | ||
| UPLOAD | Letter from SEC | Apr 16, 2020 |
Ownership
| SC 13G/A | Jpmorgan Chase & Co Updates Stake in Ciena Corp | Sep 3, 2026 | ||
| 4 | Smith Gary B | Sep 2, 2026 | ||
| 4 | Graff Marc D. | Aug 18, 2026 | ||
| 4 | Rothenstein David M | Aug 18, 2026 | ||
| 4 | Smith Gary B | Aug 18, 2026 | ||
| 4 | Gage Brodie | Aug 18, 2026 | ||
| 144 | Notice of proposed sale of securities | Aug 17, 2026 | ||
| 144 | Notice of proposed sale of securities | Aug 14, 2026 | ||
| 144 | Notice of proposed sale of securities | Aug 14, 2026 | ||
| SC 13G/A | Beneficial ownership report | Aug 6, 2026 |