ADTRAN Holdings, Inc. — 8-K Filings
211 8-K filings on record
This page lists all 8-K filings submitted to the SEC by ADTRAN Holdings, Inc. (ADTN), sorted by most recent first. Each row links to the full filing on EdgarLookup. ADTRAN Holdings, Inc. has filed 211 8-K documents with the SEC since 2017. To view all SEC filings by ADTRAN Holdings, Inc., see the full filings list.
All
10-K
10-K/A
10-K405
10-Q
10-Q/A
11-K
11-K/A
144
15-12G
25-NSE
3
3/A
4
4/A
425
5
8-K
8-K/A
8-K12B
ARS
ARS/A
CORRESP
CT ORDER
DEF 14A
DEFA14A
DEFM14A
DEFR14A
EFFECT
NT 10-K
NT 10-Q
PRE 14A
S-3
S-3ASR
S-8
S-8 POS
SC 13D
SC 13D/A
SC 13G
SC 13G/A
SC TO-I
SC TO-I/A
SCHEDULE 13G
SCHEDULE 13G/A
SD
UPLOAD
| Form | Description | Accession Number | Filed | Period |
|---|---|---|---|---|
| 8-K | 8-K | 0001193125-26-073361 | Feb 26, 2026 | Feb 25, 2026 |
| 8-K | 8-K | 0001193125-26-018367 | Jan 22, 2026 | Jan 21, 2026 |
| 8-K | 8-K | 0001193125-25-315910 | Dec 11, 2025 | Dec 9, 2025 |
| 8-K | 8-K | 0001193125-25-263524 | Nov 4, 2025 | Nov 3, 2025 |
| 8-K | 8-K | 0001193125-25-211271 | Sep 22, 2025 | Sep 19, 2025 |
| 8-K | 8-K | 0001193125-25-205483 | Sep 17, 2025 | Sep 15, 2025 |
| 8-K | 8-K | 0000950170-25-102401 | Aug 5, 2025 | Aug 4, 2025 |
| 8-K | 8-K | 0000950170-25-100222 | Jul 30, 2025 | Jul 24, 2025 |
| 8-K | 8-K | 0000950170-25-096231 | Jul 16, 2025 | — |
| 8-K | 8-K | 0000950170-25-077995 | May 28, 2025 | May 27, 2025 |
| 8-K | 8-K | 0001193125-25-127878 | May 27, 2025 | — |
| 8-K | 8-K | 0000950170-25-070473 | May 13, 2025 | — |
| 8-K | 8-K | 0000950170-25-069478 | May 12, 2025 | May 6, 2025 |
| 8-K | 8-K | 0000950170-25-066343 | May 8, 2025 | May 7, 2025 |
| 8-K | 8-K | 0001193125-25-081800 | Apr 16, 2025 | Apr 15, 2025 |
| 8-K | 8-K | 0001193125-25-048727 | Mar 7, 2025 | Mar 6, 2025 |
| 8-K | 8-K | 0000950170-25-028352 | Feb 27, 2025 | Feb 26, 2025 |
| 8-K | 8-K | 0000950170-24-122762 | Nov 7, 2024 | Nov 6, 2024 |
| 8-K | 8-K | 0000950170-24-102309 | Aug 30, 2024 | Aug 27, 2024 |
| 8-K | 8-K | 0000950170-24-091207 | Aug 6, 2024 | Aug 5, 2024 |
| 8-K | 8-K | 0000950170-24-089974 | Aug 2, 2024 | Jul 31, 2024 |
| 8-K | 8-K | 0001193125-24-158388 | Jun 10, 2024 | Jun 4, 2024 |
| 8-K | 8-K | 0000950170-24-056830 | May 9, 2024 | May 8, 2024 |
| 8-K | 8-K | 0000950170-24-053920 | May 7, 2024 | May 6, 2024 |
| 8-K | 8-K | 0001193125-24-130896 | May 3, 2024 | — |
| 8-K | 8-K | 0000950170-24-045151 | Apr 17, 2024 | Apr 11, 2024 |
| 8-K | 8-K | 0000950170-24-031864 | Mar 15, 2024 | — |
| 8-K | 8-K | 0000950170-24-020613 | Feb 27, 2024 | Feb 26, 2024 |
| 8-K | 8-K | 0001193125-24-040068 | Feb 20, 2024 | — |
| 8-K | 8-K | 0001193125-24-011697 | Jan 22, 2024 | Jan 16, 2024 |
| 8-K | 8-K | 0001193125-23-289895 | Dec 6, 2023 | Dec 4, 2023 |
| 8-K | 8-K | 0001193125-23-289150 | Dec 5, 2023 | Dec 1, 2023 |
| 8-K | 8-K | 0001193125-23-271842 | Nov 7, 2023 | Nov 6, 2023 |
| 8-K | 8-K | 0001193125-23-261665 | Oct 24, 2023 | Oct 18, 2023 |
| 8-K | 8-K | 0001193125-23-257289 | Oct 17, 2023 | Oct 16, 2023 |
| 8-K | FORM 8-K | 0001193125-23-246498 | Sep 29, 2023 | Sep 25, 2023 |
| 8-K | 8-K | 0001193125-23-209039 | Aug 10, 2023 | — |
| 8-K | FORM 8-K | 0001193125-23-204377 | Aug 7, 2023 | Aug 6, 2023 |
| 8-K | 8-K | 0001193125-23-177593 | Jun 28, 2023 | — |
| 8-K | FORM 8-K | 0001193125-23-158986 | Jun 1, 2023 | May 26, 2023 |
| 8-K | 8-K | 0001193125-23-156741 | May 30, 2023 | May 23, 2023 |
| 8-K | 8-K | 0000950170-23-021860 | May 15, 2023 | May 10, 2023 |
| 8-K | 8-K | 0000950170-23-019145 | May 9, 2023 | May 8, 2023 |
| 8-K | 8-K | 0001193125-23-097240 | Apr 11, 2023 | Apr 10, 2023 |
| 8-K | 8-K | 0001193125-23-089517 | Apr 3, 2023 | Mar 28, 2023 |
| 8-K | 8-K | 0001193125-23-085151 | Mar 30, 2023 | Mar 27, 2023 |
| 8-K | 8-K | 0000950170-23-003277 | Feb 21, 2023 | — |
| 8-K | 8-K | 0001193125-23-028386 | Feb 8, 2023 | Feb 6, 2023 |
| 8-K | 8-K | 0001193125-23-016354 | Jan 26, 2023 | Jan 20, 2023 |
| 8-K | 8-K | 0001193125-23-010702 | Jan 19, 2023 | Jan 17, 2023 |