ADTRAN Holdings, Inc.
ADTNNasdaqCIK 926282TechnologyFiscal year ends Dec 31
Reports and events: 288 filings
Newest first, by EDGAR acceptance time (Eastern). Each filing’s page lists its documents on sec.gov and, for 10-K and 10-Q reports, the extracted sections.
What the forms are: 10-K, 10-Q, 8-K, Form 4, DEF 14A, Schedule 13D, Schedule 13G, amendments, accession numbers.
| Filed | Form | What it is | Accession number |
|---|---|---|---|
| 2026-10-2917:25 ET | 8-K | 5.02 Departure or appointment of officers or directors; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-26-438101 |
| 2026-08-1016:06 ET | 8-K | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001193125-26-342359 |
| 2026-08-0408:43 ET | 10-Q | Quarterly reportPeriod 2026-06-30 | 0001193125-26-331632 |
| 2026-08-0406:36 ET | 8-K | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-26-331458 |
| 2026-07-2316:30 ET | 8-K | 1.01 Entry into a material agreement; 1.02 Termination of a material agreement; 2.03 New direct financial obligation; 9.01 Financial statements and exhibits | 0001193125-26-314198 |
| 2026-07-2207:02 ET | 8-K | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-26-311290 |
| 2026-06-2607:02 ET | 8-K | 5.02 Departure or appointment of officers or directors; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-26-283882 |
| 2026-05-1810:10 ET | 8-K | 5.03 Amendment to articles or bylaws; 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0001193125-26-228208 |
| 2026-05-0509:08 ET | 10-Q | Quarterly reportPeriod 2026-03-31 | 0001193125-26-205276 |
| 2026-05-0507:00 ET | 8-K | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-26-204995 |
| 2026-04-0716:00 ET | 8-K | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001193125-26-145496 |
| 2026-03-2706:54 ET | DEF 14A | Proxy statementPeriod 2026-03-27 | 0001193125-26-127315 |
| 2026-02-2609:26 ET | 10-K | Annual reportPeriod 2025-12-31 | 0001193125-26-073878 |
| 2026-02-2607:00 ET | 8-K | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-26-073361 |
| 2026-01-2219:34 ET | 8-K | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-26-018367 |
| 2025-12-1116:05 ET | 8-K | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001193125-25-315910 |
| 2025-11-0413:28 ET | 10-Q | Quarterly reportPeriod 2025-09-30 | 0001193125-25-264157 |
| 2025-11-0407:00 ET | 8-K | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-25-263524 |
| 2025-09-2216:05 ET | 8-K | 1.01 Entry into a material agreement; 2.03 New direct financial obligation; 3.02 Unregistered sale of equity; 9.01 Financial statements and exhibits | 0001193125-25-211271 |
| 2025-09-1707:15 ET | 8-K | 1.01 Entry into a material agreement; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-25-205483 |
| 2025-08-0511:14 ET | 10-Q | Quarterly reportPeriod 2025-06-30 | 0000950170-25-102561 |
| 2025-08-0507:30 ET | 8-K | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000950170-25-102401 |
| 2025-07-3016:06 ET | 8-K | 5.07 Shareholder vote results; 8.01 Other events; 9.01 Financial statements and exhibits | 0000950170-25-100222 |
| 2025-07-1721:29 ET | 8-K/A | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000950170-25-096408 |
| 2025-07-1615:27 ET | 8-K | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000950170-25-096231 |
| 2025-05-2819:21 ET | 8-K | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000950170-25-077995 |
| 2025-05-2717:26 ET | 8-K | 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-25-127878 |
| 2025-05-2017:22 ET | 10-Q | Quarterly reportPeriod 2025-03-31 | 0000950170-25-075374 |
| 2025-05-2017:19 ET | 10-K/A | Annual report, amendedPeriod 2024-12-31 | 0000950170-25-075366 |
| 2025-05-1316:45 ET | 8-K | 4.02 Non-reliance on financial statements; 8.01 Other events; 9.01 Financial statements and exhibits | 0000950170-25-070473 |
| 2025-05-1217:22 ET | 8-K | 1.01 Entry into a material agreement; 9.01 Financial statements and exhibits | 0000950170-25-069478 |
| 2025-05-0806:30 ET | 8-K | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000950170-25-066343 |
| 2025-04-1621:13 ET | 8-K | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-25-081800 |
| 2025-03-3116:12 ET | DEF 14A | Proxy statementPeriod 2025-03-31 | 0000950170-25-047713 |
| 2025-03-0721:30 ET | 8-K | 5.02 Departure or appointment of officers or directors; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-25-048727 |
| 2025-03-0317:21 ET | 10-K | Annual reportPeriod 2024-12-31 | 0000950170-25-031056 |
| 2025-02-2707:11 ET | 8-K | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000950170-25-028352 |
| 2024-11-1217:20 ET | 10-Q | Quarterly reportPeriod 2024-09-30 | 0000950170-24-125685 |
| 2024-11-0707:00 ET | 8-K | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000950170-24-122762 |
| 2024-08-3016:00 ET | 8-K | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0000950170-24-102309 |
| 2024-08-0914:54 ET | 10-Q | Quarterly reportPeriod 2024-06-30 | 0000950170-24-094602 |
| 2024-08-0607:17 ET | 8-K | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000950170-24-091207 |
| 2024-08-0216:14 ET | 8-K | 5.02 Departure or appointment of officers or directors | 0000950170-24-089974 |
| 2024-06-1016:39 ET | 8-K | 1.01 Entry into a material agreement; 2.03 New direct financial obligation; 9.01 Financial statements and exhibits | 0001193125-24-158388 |
| 2024-05-1013:37 ET | 10-Q | Quarterly reportPeriod 2024-03-31 | 0000950170-24-057628 |
| 2024-05-0916:00 ET | 8-K | 5.02 Departure or appointment of officers or directors; 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0000950170-24-056830 |
| 2024-05-0707:00 ET | 8-K | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000950170-24-053920 |
| 2024-05-0317:22 ET | 8-K | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-24-130896 |
| 2024-04-1716:43 ET | 8-K | 2.05 Exit or disposal costs; 9.01 Financial statements and exhibits | 0000950170-24-045151 |
| 2024-03-2709:00 ET | DEF 14A | Proxy statementPeriod 2024-05-08 | 0001193125-24-078306 |
Source: SEC EDGAR, the company’s filing index. Last ingested by Listed: Oct 30, 2026, 11:03 ET. Listed shows no prices and gives no investment advice.