ADTN - CIK 0000926282
ADTRAN Holdings, Inc. has filed 2,087 documents with the SEC between 1996 and 2026. The most frequent type is insider trade (1,171 filings), alongside the regular cadence of annual reports, quarterly reports, and event disclosures every public company must make. Use the filters to focus on one filing type, or flip the sort to trace the company's history from its earliest paperwork.
Data parsed from SEC EDGAR XBRL filings. See the full market cap rankings.
| Filing | Type | Filed | Period covered |
|---|---|---|---|
| Insider trade | 4 | 2025-01-03 | 2024-12-31 |
| Insider trade | 4 | 2025-01-03 | 2024-12-31 |
| EFFECT | - | 2024-11-26 | - |
| Company correspondence | CORRESP | 2024-11-22 | - |
| SEC correspondence | UPLOAD | 2024-11-21 | - |
| Insider trade | 4 | 2024-11-19 | 2024-11-16 |
| Insider trade | 4 | 2024-11-19 | 2024-11-16 |
| Securities registration | S-3 | 2024-11-18 | - |
| SCHEDULE 13G/A | - | 2024-11-14 | - |
| Passive ownership stake (update) | SC 13G/A | 2024-11-14 | - |
| Quarterly report | 10-Q | 2024-11-12 | 2024-09-30 |
| Passive ownership stake (update) | SC 13G/A | 2024-11-12 | - |
| Passive ownership stake | SC 13G | 2024-11-12 | - |
| Major company event | 8-K | 2024-11-07 | 2024-11-06 |
| Passive ownership stake | SC 13G | 2024-11-04 | - |
| SEC correspondence | UPLOAD | 2024-11-04 | - |
| Insider trade | 4 | 2024-10-15 | 2024-10-13 |
| Company correspondence | CORRESP | 2024-09-27 | - |
| SEC correspondence | UPLOAD | 2024-09-26 | - |
| Major company event | 8-K | 2024-08-30 | 2024-08-27 |
| Quarterly report | 10-Q | 2024-08-09 | 2024-06-30 |
| Major company event | 8-K | 2024-08-06 | 2024-08-05 |
| Major company event | 8-K | 2024-08-02 | 2024-07-31 |
| Insider trade (amended) | 4/A | 2024-07-17 | 2024-07-13 |
| Insider trade | 4 | 2024-07-16 | 2024-07-13 |
| Employee plan annual report | 11-K | 2024-06-28 | 2023-12-31 |
| Major company event | 8-K | 2024-06-10 | 2024-06-04 |
| Insider trade | 4 | 2024-05-29 | 2024-05-24 |
| Insider trade | 4 | 2024-05-29 | 2024-05-24 |
| SD | - | 2024-05-22 | - |
| Employee stock plan | S-8 | 2024-05-10 | - |
| Employee stock plan | S-8 | 2024-05-10 | - |
| Quarterly report | 10-Q | 2024-05-10 | 2024-03-31 |
| Major company event | 8-K | 2024-05-09 | 2024-05-08 |
| Major company event | 8-K | 2024-05-07 | 2024-05-06 |
| Major company event | 8-K | 2024-05-03 | 2024-05-03 |
| Major company event | 8-K | 2024-04-17 | 2024-04-11 |
| Proxy materials | DEFA14A | 2024-04-04 | - |
| Annual report to shareholders | ARS | 2024-03-27 | 2023-12-31 |
| Proxy materials | DEFA14A | 2024-03-27 | - |
| Proxy statement | DEF 14A | 2024-03-27 | 2024-05-08 |
| Passive ownership stake | SC 13G | 2024-03-25 | - |
| Annual report | 10-K | 2024-03-15 | 2023-12-31 |
| Major company event | 8-K | 2024-03-15 | 2024-03-15 |
| Quarterly report (amended) | 10-Q/A | 2024-03-15 | 2023-09-30 |
| Quarterly report (amended) | 10-Q/A | 2024-03-15 | 2023-06-30 |
| Quarterly report (amended) | 10-Q/A | 2024-03-15 | 2023-03-31 |
| NT 10-K | - | 2024-02-29 | 2023-12-31 |
| Major company event | 8-K | 2024-02-27 | 2024-02-26 |
| Major company event | 8-K | 2024-02-20 | 2024-02-20 |