ADTRAN Holdings, Inc. of HUNTSVILLE, AL filed a DEFA14A with the SEC on 2026-03-27. Industry: Telephone & Telegraph Apparatus.
| Seq | Type | Description |
|---|---|---|
| 1 | DEFA14A | DEFA14A |
| 2 | GRAPHIC | GRAPHIC |
| 3 | GRAPHIC | GRAPHIC |
| 4 | EX-101.SCH | XBRL TAXONOMY EXTENSION SCHEMA WITH EMBEDDED LINKBASES DOCUMENT |
| 14 | XML | EXTRACTED XBRL INSTANCE DOCUMENT |
Showing 12 of 60 filings.
| Filed | Form |
|---|---|
| 2026-05-01 | DEFA14A |
| 2026-03-27 | DEFA14A |
| 2026-03-27 | DEF 14A |
| 2026-03-13 | PRE 14A |
| 2025-06-06 | DEFA14A |
| 2025-06-06 | DEFR14A |
| 2025-05-27 | DEFA14A |
| 2025-05-13 | DEFA14A |
| 2025-03-31 | DEFA14A |
| 2025-03-31 | DEF 14A |
| 2024-04-04 | DEFA14A |
| 2024-03-27 | DEFA14A |