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 |
|---|---|---|---|
| 4 | Insider transaction | Nov 5, 2026 | Nov 3, 2026 |
| 4 | Insider transaction | Nov 2, 2026 | Oct 27, 2026 |
| 3 | Initial insider ownership | Nov 2, 2026 | Oct 27, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 30, 2026 | — |
| 4 | Insider transaction | Aug 10, 2026 | Aug 10, 2026 |
| 4 | Insider transaction | Aug 7, 2026 | Aug 6, 2026 |
| 4 | Insider transaction | Jul 28, 2026 | Jul 24, 2026 |
| 4 | Insider transaction | Jul 6, 2026 | Jul 1, 2026 |
| 3 | Initial insider ownership | Jul 1, 2026 | Jul 1, 2026 |
| 4 | Insider transaction | May 22, 2026 | May 20, 2026 |
| 144 | Notice of proposed sale | May 20, 2026 | — |
| 4 | Insider transaction | May 11, 2026 | May 7, 2026 |
| 144 | Notice of proposed sale | May 7, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 28, 2026 | — |
| 4 | Insider transaction | Apr 3, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 3, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 3, 2026 | Apr 1, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 26, 2026 | — |
| 4 | Insider transaction | Mar 23, 2026 | Mar 19, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 18, 2026 | — |
| 4 | Insider transaction | Mar 5, 2026 | Mar 4, 2026 |
| 4/A | Filing | Mar 5, 2026 | Jan 24, 2025 |
| 144 | Notice of proposed sale | Mar 4, 2026 | — |
| 4/A | Filing | Jan 30, 2026 | Jan 26, 2026 |
| 4 | Insider transaction | Jan 28, 2026 | Jan 26, 2026 |
| 4 | Insider transaction | Jan 28, 2026 | Jan 26, 2026 |
| 4 | Insider transaction | Jan 27, 2026 | Jan 24, 2026 |
| 4 | Insider transaction | Jan 27, 2026 | Jan 24, 2026 |
| 4 | Insider transaction | Jan 22, 2026 | Jan 20, 2026 |
| 4 | Insider transaction | Jan 22, 2026 | Jan 20, 2026 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Dec 1, 2025 | Nov 28, 2025 |
| 4 | Insider transaction | Dec 1, 2025 | Nov 26, 2025 |
| 4 | Insider transaction | Nov 25, 2025 | Nov 24, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| 4 | Insider transaction | Jul 15, 2025 | Jul 13, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 7, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 9, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 23, 2025 | — |
| 4 | Insider transaction | Apr 15, 2025 | Apr 13, 2025 |
| 4 | Insider transaction | Mar 20, 2025 | Mar 19, 2025 |
| 3 | Initial insider ownership | Mar 20, 2025 | Mar 10, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Mar 6, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 14, 2025 | — |
| 4 | Insider transaction | Jan 28, 2025 | Jan 24, 2025 |
| 4 | Insider transaction | Jan 28, 2025 | Jan 24, 2025 |
| 4 | Insider transaction | Jan 28, 2025 | Jan 24, 2025 |
| 4 | Insider transaction | Jan 28, 2025 | Jan 24, 2025 |
| 4 | Insider transaction | Jan 22, 2025 | Jan 20, 2025 |
| 4 | Insider transaction | Jan 22, 2025 | Jan 20, 2025 |
| 4 | Insider transaction | Jan 15, 2025 | Jan 13, 2025 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Nov 19, 2024 | Nov 16, 2024 |
| 4 | Insider transaction | Nov 19, 2024 | Nov 16, 2024 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 12, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Nov 12, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Nov 4, 2024 | — |
| 4 | Insider transaction | Oct 15, 2024 | Oct 13, 2024 |
| 4/A | Filing | Jul 17, 2024 | Jul 13, 2024 |
| 4 | Insider transaction | Jul 16, 2024 | Jul 13, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Jul 8, 2024 | — |
| 4 | Insider transaction | May 29, 2024 | May 24, 2024 |
| 4 | Insider transaction | May 29, 2024 | May 24, 2024 |
| SC 13G | Ownership over 5% (passive) | Mar 25, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 12, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 12, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 12, 2024 | — |
| 4 | Insider transaction | Jan 30, 2024 | Jan 26, 2024 |
| 4 | Insider transaction | Jan 30, 2024 | Jan 26, 2024 |
| 4 | Insider transaction | Jan 30, 2024 | Jan 26, 2024 |
| 4 | Insider transaction | Jan 30, 2024 | Jan 26, 2024 |
| 4 | Insider transaction | Jan 23, 2024 | Jan 20, 2024 |
| 4 | Insider transaction | Jan 23, 2024 | Jan 20, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 22, 2024 | — |
| 4 | Insider transaction | Jan 3, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Jan 3, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Jan 3, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Jan 3, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Jan 3, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Jan 3, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Jan 3, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Dec 8, 2023 | Dec 7, 2023 |
| 4 | Insider transaction | Dec 4, 2023 | Dec 1, 2023 |
| 4 | Insider transaction | Nov 20, 2023 | Nov 16, 2023 |
| 4 | Insider transaction | Nov 20, 2023 | Nov 16, 2023 |
| 4 | Insider transaction | Nov 17, 2023 | Nov 15, 2023 |
| 4 | Insider transaction | Nov 17, 2023 | Nov 15, 2023 |
| 4 | Insider transaction | Sep 21, 2023 | Sep 19, 2023 |
| 4 | Insider transaction | Sep 7, 2023 | Sep 5, 2023 |
| 4 | Insider transaction | Sep 7, 2023 | Sep 5, 2023 |
| 4 | Insider transaction | Sep 7, 2023 | Aug 9, 2023 |
| 4 | Insider transaction | Sep 7, 2023 | Sep 5, 2023 |
| 4 | Insider transaction | Sep 7, 2023 | Sep 5, 2023 |
| 4 | Insider transaction | Sep 7, 2023 | Sep 5, 2023 |
| 4 | Insider transaction | Sep 7, 2023 | Sep 5, 2023 |
| 4 | Insider transaction | Sep 7, 2023 | Sep 5, 2023 |
| 4 | Insider transaction | Sep 7, 2023 | Sep 5, 2023 |
| 4 | Insider transaction | Sep 7, 2023 | Aug 9, 2023 |
| 4 | Insider transaction | Jun 8, 2023 | Jun 6, 2023 |
| 4 | Insider transaction | Jun 8, 2023 | Jun 6, 2023 |
| 4 | Insider transaction | Jun 8, 2023 | Jun 6, 2023 |
| 4 | Insider transaction | Jun 8, 2023 | Jun 6, 2023 |
| 4 | Insider transaction | Jun 8, 2023 | Jun 6, 2023 |
| 4 | Insider transaction | Jun 8, 2023 | Jun 6, 2023 |
| 4 | Insider transaction | Jun 8, 2023 | Jun 6, 2023 |
| 4 | Insider transaction | Jun 8, 2023 | Jun 6, 2023 |
| 4 | Insider transaction | Jun 8, 2023 | Jun 6, 2023 |
| 4 | Insider transaction | Jun 8, 2023 | Jun 6, 2023 |
| 4 | Insider transaction | May 25, 2023 | May 24, 2023 |
| 4 | Insider transaction | May 25, 2023 | May 24, 2023 |
| 3 | Initial insider ownership | May 1, 2023 | May 1, 2023 |
| 4 | Insider transaction | Mar 23, 2023 | Mar 21, 2023 |
| 4 | Insider transaction | Mar 23, 2023 | Mar 21, 2023 |
| 4 | Insider transaction | Mar 23, 2023 | Mar 21, 2023 |
| 4 | Insider transaction | Mar 23, 2023 | Mar 21, 2023 |
| 4 | Insider transaction | Mar 23, 2023 | Mar 21, 2023 |
| 4 | Insider transaction | Mar 23, 2023 | Mar 21, 2023 |
| 4 | Insider transaction | Mar 23, 2023 | Mar 21, 2023 |
| 4 | Insider transaction | Mar 23, 2023 | Mar 21, 2023 |
| 4 | Insider transaction | Mar 23, 2023 | Mar 21, 2023 |
| 4 | Insider transaction | Mar 23, 2023 | Mar 21, 2023 |
| 4 | Insider transaction | Mar 23, 2023 | Mar 21, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 26, 2023 | — |
| 4 | Insider transaction | Jan 25, 2023 | Jan 24, 2023 |
| 4 | Insider transaction | Jan 25, 2023 | Jan 24, 2023 |
| 4 | Insider transaction | Jan 25, 2023 | Jan 24, 2023 |
| 4 | Insider transaction | Jan 25, 2023 | Jan 24, 2023 |
| 4 | Insider transaction | Jan 25, 2023 | Jan 24, 2023 |
| 4 | Insider transaction | Jan 25, 2023 | Jan 24, 2023 |
| 4 | Insider transaction | Jan 25, 2023 | Jan 24, 2023 |
| 4 | Insider transaction | Jan 25, 2023 | Jan 24, 2023 |
| 4 | Insider transaction | Jan 24, 2023 | Jan 20, 2023 |
| 4 | Insider transaction | Jan 24, 2023 | Jan 20, 2023 |
| SC 13G | Ownership over 5% (passive) | Jan 20, 2023 | — |
| 4 | Insider transaction | Jan 4, 2023 | Dec 31, 2022 |
| 4 | Insider transaction | Jan 4, 2023 | Dec 31, 2022 |
| 4 | Insider transaction | Jan 4, 2023 | Dec 31, 2022 |
| 4 | Insider transaction | Jan 4, 2023 | Dec 31, 2022 |
| 4 | Insider transaction | Jan 4, 2023 | Dec 31, 2022 |
| 4 | Insider transaction | Jan 4, 2023 | Dec 31, 2022 |
| 4 | Insider transaction | Jan 4, 2023 | Dec 31, 2022 |
| 4 | Insider transaction | Jan 4, 2023 | Dec 31, 2022 |
| 4 | Insider transaction | Jan 4, 2023 | Dec 31, 2022 |
| 4 | Insider transaction | Jan 4, 2023 | Dec 31, 2022 |
| 4 | Insider transaction | Jan 4, 2023 | Dec 31, 2022 |
| 4 | Insider transaction | Dec 9, 2022 | Dec 7, 2022 |
| 4 | Insider transaction | Dec 9, 2022 | Dec 7, 2022 |
| 4 | Insider transaction | Dec 8, 2022 | Dec 6, 2022 |
| 4 | Insider transaction | Dec 8, 2022 | Dec 6, 2022 |
| 4 | Insider transaction | Dec 8, 2022 | Dec 6, 2022 |
| 4 | Insider transaction | Dec 8, 2022 | Dec 6, 2022 |
| 4 | Insider transaction | Dec 8, 2022 | Dec 6, 2022 |
| 4 | Insider transaction | Dec 8, 2022 | Dec 6, 2022 |
| 4 | Insider transaction | Dec 8, 2022 | Dec 6, 2022 |
| 4 | Insider transaction | Dec 8, 2022 | Dec 6, 2022 |
| 4 | Insider transaction | Dec 8, 2022 | Dec 6, 2022 |
| 4 | Insider transaction | Dec 8, 2022 | Dec 6, 2022 |
| 4 | Insider transaction | Nov 21, 2022 | Nov 17, 2022 |
| 4 | Insider transaction | Nov 21, 2022 | Nov 17, 2022 |
| 4 | Insider transaction | Nov 21, 2022 | Nov 17, 2022 |
| 4 | Insider transaction | Nov 18, 2022 | Nov 16, 2022 |
| 4 | Insider transaction | Nov 18, 2022 | Nov 16, 2022 |
| 4 | Insider transaction | Nov 18, 2022 | Nov 16, 2022 |
| 4 | Insider transaction | Nov 17, 2022 | Nov 15, 2022 |
| 4 | Insider transaction | Nov 17, 2022 | Nov 15, 2022 |
| 4 | Insider transaction | Nov 17, 2022 | Nov 15, 2022 |
| 4 | Insider transaction | Nov 14, 2022 | Nov 9, 2022 |
| 4 | Insider transaction | Nov 14, 2022 | Nov 9, 2022 |
| 4 | Insider transaction | Nov 14, 2022 | Nov 9, 2022 |
| SC 13G | Ownership over 5% (passive) | Sep 8, 2022 | — |
| SC 13G | Ownership over 5% (passive) | Sep 8, 2022 | — |
| 4/A | Form 4/a submission | Sep 8, 2022 | Sep 1, 2022 |
| 4 | Insider transaction | Sep 6, 2022 | Sep 1, 2022 |
| 4 | Insider transaction | Sep 6, 2022 | Sep 1, 2022 |
| 4 | Insider transaction | Sep 6, 2022 | Sep 1, 2022 |
| 4 | Insider transaction | Sep 6, 2022 | Sep 1, 2022 |
| 4 | Insider transaction | Sep 6, 2022 | Sep 1, 2022 |
| 4 | Insider transaction | Sep 6, 2022 | Sep 1, 2022 |
| 4 | Insider transaction | Sep 6, 2022 | Sep 1, 2022 |
| 4 | Insider transaction | Sep 6, 2022 | Sep 1, 2022 |
| 4 | Insider transaction | Sep 6, 2022 | Sep 1, 2022 |
| 4 | Insider transaction | Sep 6, 2022 | Sep 1, 2022 |
| 3 | Initial insider ownership | Sep 2, 2022 | Sep 1, 2022 |
Showing 200 filings, the most recent 200. 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.