ADTRAN Holdings, Inc. of HUNTSVILLE, AL filed a PRE 14A with the SEC on 2026-03-13. Industry: Telephone & Telegraph Apparatus.
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| 1 | PRE 14A | PRE 14A |
| 2 | GRAPHIC | GRAPHIC |
| 3 | GRAPHIC | GRAPHIC |
| 4 | GRAPHIC | GRAPHIC |
| 5 | GRAPHIC | GRAPHIC |
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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 |