# ADTRAN Holdings, Inc. — DEF 14A

ADTRAN Holdings, Inc. of HUNTSVILLE, AL filed a DEF 14A with the SEC on 1998-03-19. Industry: Telephone & Telegraph Apparatus.

## Filing

- Filed: 1998-03-19
- Form: DEF 14A
- Accession: 0000931763-98-000656
- Registrant: ADTRAN Holdings, Inc.
- CIK: 0000926282
- Industry (SIC): Telephone & Telegraph Apparatus (3661)
- Location: HUNTSVILLE, AL

## Filing timeline for this registrant (60)

_Showing 12 of 60 filings._

| Filed | Form |
| --- | --- |
| [2026-05-01](https://search.stillhousedata.com/proxy/0001193125-26-200826) | DEFA14A |
| [2026-03-27](https://search.stillhousedata.com/proxy/0001193125-26-127317) | DEFA14A |
| [2026-03-27](https://search.stillhousedata.com/proxy/0001193125-26-127315) | DEF 14A |
| [2026-03-13](https://search.stillhousedata.com/proxy/0001193125-26-106086) | PRE 14A |
| [2025-06-06](https://search.stillhousedata.com/proxy/0000950170-25-082688) | DEFA14A |
| [2025-06-06](https://search.stillhousedata.com/proxy/0000950170-25-082684) | DEFR14A |
| [2025-05-27](https://search.stillhousedata.com/proxy/0001193125-25-127881) | DEFA14A |
| [2025-05-13](https://search.stillhousedata.com/proxy/0000950170-25-070514) | DEFA14A |
| [2025-03-31](https://search.stillhousedata.com/proxy/0000950170-25-047718) | DEFA14A |
| [2025-03-31](https://search.stillhousedata.com/proxy/0000950170-25-047713) | DEF 14A |
| [2024-04-04](https://search.stillhousedata.com/proxy/0001193125-24-086808) | DEFA14A |
| [2024-03-27](https://search.stillhousedata.com/proxy/0001193125-24-078315) | DEFA14A |

## More

- [CIK 926282 on SEC EDGAR (source of record)](https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=926282&type=&dateb=&owner=include&count=40)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/proxy/0000931763-98-000656.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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