ADTRAN Holdings, Inc. — All Filings
1,001 total filings on record
Public companies registered with the SEC are required to file periodic reports, disclosures, and notices throughout the year. The most important are the 10-K (annual report), 10-Q (quarterly report), and 8-K (material event notice). Use the filters below to narrow by form type.
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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 |
|---|---|---|---|---|
| ARS | ARS | 0001193125-26-127649 | Mar 27, 2026 | Dec 31, 2025 |
| DEFA14A | DEFA14A | 0001193125-26-127317 | Mar 27, 2026 | — |
| DEF 14A | DEF 14A | 0001193125-26-127315 | Mar 27, 2026 | — |
| SCHEDULE 13G/A | — | 0000102909-26-000526 | Mar 26, 2026 | — |
| 4 | 4 | 0001193125-26-119867 | Mar 23, 2026 | Mar 19, 2026 |
| SCHEDULE 13G/A | — | 0001731122-26-000445 | Mar 18, 2026 | — |
| PRE 14A | PRE 14A | 0001193125-26-106086 | Mar 13, 2026 | — |
| 4 | 4 | 0001193125-26-093954 | Mar 5, 2026 | Mar 4, 2026 |
| 4/A | 4/A | 0001193125-26-093935 | Mar 5, 2026 | Jan 24, 2025 |
| 144 | — | 0001950047-26-002159 | Mar 4, 2026 | — |
| 10-K | 10-K | 0001193125-26-073878 | Feb 26, 2026 | Dec 31, 2025 |
| 8-K | 8-K | 0001193125-26-073361 | Feb 26, 2026 | Feb 25, 2026 |
| 4/A | 4/A | 0001193125-26-031745 | Jan 30, 2026 | Jan 26, 2026 |
| 4 | 4 | 0001193125-26-027417 | Jan 28, 2026 | Jan 26, 2026 |
| 4 | 4 | 0001193125-26-027411 | Jan 28, 2026 | Jan 26, 2026 |
| 4 | 4 | 0001193125-26-024827 | Jan 27, 2026 | Jan 24, 2026 |
| 4 | 4 | 0001193125-26-024818 | Jan 27, 2026 | Jan 24, 2026 |
| 4 | 4 | 0001193125-26-019464 | Jan 22, 2026 | Jan 20, 2026 |
| 4 | 4 | 0001193125-26-019455 | Jan 22, 2026 | Jan 20, 2026 |
| 8-K | 8-K | 0001193125-26-018367 | Jan 22, 2026 | Jan 21, 2026 |
| 4 | 4 | 0001193125-26-002903 | Jan 5, 2026 | Dec 31, 2025 |
| 4 | 4 | 0001193125-26-002902 | Jan 5, 2026 | Dec 31, 2025 |
| 4 | 4 | 0001193125-26-002901 | Jan 5, 2026 | Dec 31, 2025 |
| 4 | 4 | 0001193125-26-002900 | Jan 5, 2026 | Dec 31, 2025 |
| 4 | 4 | 0001193125-26-002898 | Jan 5, 2026 | Dec 31, 2025 |
| 4 | 4 | 0001193125-26-002897 | Jan 5, 2026 | Dec 31, 2025 |
| 8-K | 8-K | 0001193125-25-315910 | Dec 11, 2025 | Dec 9, 2025 |
| 4 | 4 | 0001193125-25-303492 | Dec 1, 2025 | Nov 28, 2025 |
| 4 | 4 | 0001193125-25-303491 | Dec 1, 2025 | Nov 26, 2025 |
| 4 | 4 | 0001193125-25-295709 | Nov 25, 2025 | Nov 24, 2025 |
| 4 | 4 | 0001193125-25-288074 | Nov 19, 2025 | Nov 17, 2025 |
| 4 | 4 | 0001193125-25-288073 | Nov 19, 2025 | Nov 17, 2025 |
| SCHEDULE 13G/A | — | 0001645721-25-000021 | Nov 14, 2025 | — |
| 10-Q | 10-Q | 0001193125-25-264157 | Nov 4, 2025 | Sep 30, 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 |
| SCHEDULE 13G/A | — | 0001645721-25-000017 | Aug 14, 2025 | — |
| 10-Q | 10-Q | 0000950170-25-102561 | Aug 5, 2025 | Jun 30, 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/A | 8-K/A | 0000950170-25-096408 | Jul 17, 2025 | Jul 16, 2025 |
| 8-K | 8-K | 0000950170-25-096231 | Jul 16, 2025 | — |
| 4 | 4 | 0000950170-25-095931 | Jul 15, 2025 | Jul 13, 2025 |
| SCHEDULE 13G/A | — | 0000932471-25-000696 | Jul 7, 2025 | — |
| 11-K | 11-K | 0000950170-25-091544 | Jun 30, 2025 | Dec 31, 2024 |
| ARS/A | ARS/A | 0000950170-25-082689 | Jun 6, 2025 | Dec 31, 2024 |
| DEFA14A | DEFA14A | 0000950170-25-082688 | Jun 6, 2025 | — |
| DEFR14A | DEFR14A | 0000950170-25-082684 | Jun 6, 2025 | — |
| SD | SD | 0000950170-25-078965 | May 29, 2025 | — |