ADTRAN Holdings, Inc. SEC filings ADTN
ADTRAN Holdings, Inc. has 1,006 filings in SEC EDGAR's recent list, going back to Aug 21, 2017. Its latest annual report, Form ARS, was filed on Mar 27, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 5, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Nov 3, 2026 (results of operations, regulation fd disclosure). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| S-3ASR | Automatic shelf registration | Jul 17, 2026 | — |
| S-3 | Shelf registration | Nov 18, 2024 | — |
| S-8 | Employee stock plan registration | May 10, 2024 | — |
| S-8 | Employee stock plan registration | May 10, 2024 | — |
| S-3ASR | Automatic shelf registration | Dec 23, 2022 | — |
| S-8 | Employee stock plan registration | Jul 11, 2022 | — |
| S-8 | Employee stock plan registration | Jul 11, 2022 | — |
| S-8 POS | Filing | Jul 8, 2022 | — |
| S-8 POS | Filing | Jul 8, 2022 | — |
| S-8 POS | Filing | Jul 8, 2022 | — |
| S-8 POS | Filing | Jul 8, 2022 | — |
| S-8 POS | Filing | Jul 8, 2022 | — |
| S-8 POS | Filing | Jul 8, 2022 | — |
| S-8 POS | Filing | Jul 8, 2022 | — |
| S-8 POS | Filing | Jul 8, 2022 | — |
| S-8 POS | Filing | Jul 8, 2022 | — |
| S-8 POS | Filing | Jul 8, 2022 | — |
| S-8 POS | Filing | Jul 8, 2022 | — |
| S-8 POS | Filing | Jul 8, 2022 | — |
| S-8 POS | Filing | Jul 8, 2022 | — |
| S-8 | Employee stock plan registration | Oct 29, 2020 | — |
| S-8 | Employee stock plan registration | Oct 29, 2020 | — |
Showing 22 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Telephone & Telegraph Apparatus (SIC 3661)
- Listed as
- ADTN (Nasdaq)
- Fiscal year ends
- December 31
- Headquarters
- Huntsville, AL
- SEC filer status
- Large accelerated filer
- SEC CIK
- 926282
- Former names
- ADTRAN INC (until Jul 11, 2022)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.