# ADTRAN Holdings, Inc.: filings

ADTN · Nasdaq · CIK 926282 · [Technology](/sectors/technology.md) · fiscal year ends Dec 31

Pages: [Overview](/companies/adtn.md) · [Financials](/companies/adtn/financials.md) · [Filings](/companies/adtn/filings.md) · [Insiders](/companies/adtn/insiders.md)

## Reports and events: 288 filings

Newest first, by EDGAR acceptance time (Eastern). Filter with ?form= one of: `periodic`, `8-K`, `10-K`, `10-Q`, `4`, `proxy`, `13dg`, `all`, or any form this company filed (4 948, 8-K 182, SC 13G/A 98, 425 79, 10-Q 53, 4/A 47, 3 29, SC 13G 22, CORRESP 19, 10-K 18, 11-K 18, DEF 14A 18, UPLOAD 16, DEFA14A 14, S-8 POS 13, SD 13, SCHEDULE 13G/A 10, S-8 8, 8-K/A 7, 10-Q/A 5, 10-K/A 4, ARS 4, 144 3, 3/A 3, 5 3, NT 10-Q 3, DEFR14A 2, S-3ASR 2, SCHEDULE 13G 2, 15-12G 1, 25-NSE 1, 8-K12B 1, ARS/A 1, CT ORDER 1, DEFM14A 1, EFFECT 1, NT 10-K 1, PRE 14A 1, S-3 1, SC 13D 1).

| Filed | Accepted | Form | What it is | Accession |
| --- | --- | --- | --- | --- |
| 2026-10-29 | 17:25 ET | [8-K](/filings/0001193125-26-438101.md) | 5.02 Departure or appointment of officers or directors; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-26-438101 |
| 2026-08-10 | 16:06 ET | [8-K](/filings/0001193125-26-342359.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001193125-26-342359 |
| 2026-08-04 | 08:43 ET | [10-Q](/filings/0001193125-26-331632.md) | Quarterly report, period 2026-06-30 | 0001193125-26-331632 |
| 2026-08-04 | 06:36 ET | [8-K](/filings/0001193125-26-331458.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-26-331458 |
| 2026-07-23 | 16:30 ET | [8-K](/filings/0001193125-26-314198.md) | 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 |
| 2026-07-22 | 07:02 ET | [8-K](/filings/0001193125-26-311290.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-26-311290 |
| 2026-06-26 | 07:02 ET | [8-K](/filings/0001193125-26-283882.md) | 5.02 Departure or appointment of officers or directors; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-26-283882 |
| 2026-05-18 | 10:10 ET | [8-K](/filings/0001193125-26-228208.md) | 5.03 Amendment to articles or bylaws; 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0001193125-26-228208 |
| 2026-05-05 | 09:08 ET | [10-Q](/filings/0001193125-26-205276.md) | Quarterly report, period 2026-03-31 | 0001193125-26-205276 |
| 2026-05-05 | 07:00 ET | [8-K](/filings/0001193125-26-204995.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-26-204995 |
| 2026-04-07 | 16:00 ET | [8-K](/filings/0001193125-26-145496.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001193125-26-145496 |
| 2026-03-27 | 06:54 ET | [DEF 14A](/filings/0001193125-26-127315.md) | Proxy statement, period 2026-03-27 | 0001193125-26-127315 |
| 2026-02-26 | 09:26 ET | [10-K](/filings/0001193125-26-073878.md) | Annual report, period 2025-12-31 | 0001193125-26-073878 |
| 2026-02-26 | 07:00 ET | [8-K](/filings/0001193125-26-073361.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-26-073361 |
| 2026-01-22 | 19:34 ET | [8-K](/filings/0001193125-26-018367.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-26-018367 |
| 2025-12-11 | 16:05 ET | [8-K](/filings/0001193125-25-315910.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001193125-25-315910 |
| 2025-11-04 | 13:28 ET | [10-Q](/filings/0001193125-25-264157.md) | Quarterly report, period 2025-09-30 | 0001193125-25-264157 |
| 2025-11-04 | 07:00 ET | [8-K](/filings/0001193125-25-263524.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-25-263524 |
| 2025-09-22 | 16:05 ET | [8-K](/filings/0001193125-25-211271.md) | 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 |
| 2025-09-17 | 07:15 ET | [8-K](/filings/0001193125-25-205483.md) | 1.01 Entry into a material agreement; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-25-205483 |
| 2025-08-05 | 11:14 ET | [10-Q](/filings/0000950170-25-102561.md) | Quarterly report, period 2025-06-30 | 0000950170-25-102561 |
| 2025-08-05 | 07:30 ET | [8-K](/filings/0000950170-25-102401.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000950170-25-102401 |
| 2025-07-30 | 16:06 ET | [8-K](/filings/0000950170-25-100222.md) | 5.07 Shareholder vote results; 8.01 Other events; 9.01 Financial statements and exhibits | 0000950170-25-100222 |
| 2025-07-17 | 21:29 ET | [8-K/A](/filings/0000950170-25-096408.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000950170-25-096408 |
| 2025-07-16 | 15:27 ET | [8-K](/filings/0000950170-25-096231.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000950170-25-096231 |
| 2025-05-28 | 19:21 ET | [8-K](/filings/0000950170-25-077995.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0000950170-25-077995 |
| 2025-05-27 | 17:26 ET | [8-K](/filings/0001193125-25-127878.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-25-127878 |
| 2025-05-20 | 17:22 ET | [10-Q](/filings/0000950170-25-075374.md) | Quarterly report, period 2025-03-31 | 0000950170-25-075374 |
| 2025-05-20 | 17:19 ET | [10-K/A](/filings/0000950170-25-075366.md) | Annual report, amended, period 2024-12-31 | 0000950170-25-075366 |
| 2025-05-13 | 16:45 ET | [8-K](/filings/0000950170-25-070473.md) | 4.02 Non-reliance on financial statements; 8.01 Other events; 9.01 Financial statements and exhibits | 0000950170-25-070473 |
| 2025-05-12 | 17:22 ET | [8-K](/filings/0000950170-25-069478.md) | 1.01 Entry into a material agreement; 9.01 Financial statements and exhibits | 0000950170-25-069478 |
| 2025-05-08 | 06:30 ET | [8-K](/filings/0000950170-25-066343.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000950170-25-066343 |
| 2025-04-16 | 21:13 ET | [8-K](/filings/0001193125-25-081800.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-25-081800 |
| 2025-03-31 | 16:12 ET | [DEF 14A](/filings/0000950170-25-047713.md) | Proxy statement, period 2025-03-31 | 0000950170-25-047713 |
| 2025-03-07 | 21:30 ET | [8-K](/filings/0001193125-25-048727.md) | 5.02 Departure or appointment of officers or directors; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-25-048727 |
| 2025-03-03 | 17:21 ET | [10-K](/filings/0000950170-25-031056.md) | Annual report, period 2024-12-31 | 0000950170-25-031056 |
| 2025-02-27 | 07:11 ET | [8-K](/filings/0000950170-25-028352.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000950170-25-028352 |
| 2024-11-12 | 17:20 ET | [10-Q](/filings/0000950170-24-125685.md) | Quarterly report, period 2024-09-30 | 0000950170-24-125685 |
| 2024-11-07 | 07:00 ET | [8-K](/filings/0000950170-24-122762.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000950170-24-122762 |
| 2024-08-30 | 16:00 ET | [8-K](/filings/0000950170-24-102309.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0000950170-24-102309 |
| 2024-08-09 | 14:54 ET | [10-Q](/filings/0000950170-24-094602.md) | Quarterly report, period 2024-06-30 | 0000950170-24-094602 |
| 2024-08-06 | 07:17 ET | [8-K](/filings/0000950170-24-091207.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000950170-24-091207 |
| 2024-08-02 | 16:14 ET | [8-K](/filings/0000950170-24-089974.md) | 5.02 Departure or appointment of officers or directors | 0000950170-24-089974 |
| 2024-06-10 | 16:39 ET | [8-K](/filings/0001193125-24-158388.md) | 1.01 Entry into a material agreement; 2.03 New direct financial obligation; 9.01 Financial statements and exhibits | 0001193125-24-158388 |
| 2024-05-10 | 13:37 ET | [10-Q](/filings/0000950170-24-057628.md) | Quarterly report, period 2024-03-31 | 0000950170-24-057628 |
| 2024-05-09 | 16:00 ET | [8-K](/filings/0000950170-24-056830.md) | 5.02 Departure or appointment of officers or directors; 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0000950170-24-056830 |
| 2024-05-07 | 07:00 ET | [8-K](/filings/0000950170-24-053920.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000950170-24-053920 |
| 2024-05-03 | 17:22 ET | [8-K](/filings/0001193125-24-130896.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-24-130896 |
| 2024-04-17 | 16:43 ET | [8-K](/filings/0000950170-24-045151.md) | 2.05 Exit or disposal costs; 9.01 Financial statements and exhibits | 0000950170-24-045151 |
| 2024-03-27 | 09:00 ET | [DEF 14A](/filings/0001193125-24-078306.md) | Proxy statement, period 2024-05-08 | 0001193125-24-078306 |

Page 1 of 6. [Older](/companies/adtn/filings.md?page=2)
Source: SEC EDGAR, the company’s filing index. Last ingested by Listed: Oct 30, 2026, 11:03 ET. No prices; not investment advice.