ADTRAN Holdings, Inc. — DEFA14A Filings
13 DEFA14A filings on record
This page lists all DEFA14A 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 13 DEFA14A 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 |
|---|---|---|---|---|
| DEFA14A | DEFA14A | 0001193125-26-127317 | Mar 27, 2026 | — |
| DEFA14A | DEFA14A | 0000950170-25-082688 | Jun 6, 2025 | — |
| DEFA14A | DEFA14A | 0001193125-25-127881 | May 27, 2025 | — |
| DEFA14A | DEFA14A | 0000950170-25-070514 | May 13, 2025 | — |
| DEFA14A | DEFA14A | 0000950170-25-047718 | Mar 31, 2025 | — |
| DEFA14A | DEFA14A | 0001193125-24-086808 | Apr 4, 2024 | — |
| DEFA14A | DEFA14A | 0001193125-24-078315 | Mar 27, 2024 | — |
| DEFA14A | DEFA14A | 0001193125-23-132867 | May 3, 2023 | — |
| DEFA14A | DEFA14A | 0001193125-23-081611 | Mar 28, 2023 | — |
| DEFA14A | DEFA14A | 0001193125-22-087456 | Mar 29, 2022 | — |
| DEFA14A | DEFA14A | 0001193125-21-099308 | Mar 30, 2021 | — |
| DEFA14A | DEFA14A | 0001193125-20-104870 | Apr 13, 2020 | — |
| DEFA14A | DEFA14A | 0001193125-20-095424 | Apr 2, 2020 | — |