ADTRAN Holdings Inc. (ADTN) — SEC filings
Recent SEC filings for ADTRAN Holdings Inc. — 10-K, 10-Q, 8-K, proxy statements, and insider transactions.
| Form Type | Filing Date | Accepted Date |
|---|---|---|
| 11-K | 2026-06-26 | 2026-06-26 |
| 8-K | 2026-06-26 | 2026-06-26 |
| 4 | 2026-05-22 | 2026-05-22 |
| 8-K | 2026-05-18 | 2026-05-18 |
| SD | 2026-05-12 | 2026-05-12 |
| 4 | 2026-05-11 | 2026-05-11 |
| 10-Q | 2026-05-05 | 2026-05-05 |
| 8-K | 2026-05-05 | 2026-05-05 |
| DEFA14A | 2026-05-01 | 2026-05-01 |
| SC 13G | 2026-04-28 | 2026-04-28 |
| 8-K | 2026-04-07 | 2026-04-07 |
| 4 | 2026-04-03 | 2026-04-03 |
| 4 | 2026-04-03 | 2026-04-03 |
| 4 | 2026-04-03 | 2026-04-03 |
| ARS | 2026-03-27 | 2026-03-27 |
| DEFA14A | 2026-03-27 | 2026-03-27 |
| DEF 14A | 2026-03-27 | 2026-03-27 |
| SC 13G/A | 2026-03-26 | 2026-03-26 |
| 4 | 2026-03-23 | 2026-03-23 |
| SC 13G/A | 2026-03-18 | 2026-03-18 |
Recent SEC filings.