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 |
|---|---|---|---|
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 3, 2026 | Nov 2, 2026 |
| 8-K |
Current report
Officer or director change, Other events
|
Oct 29, 2026 | Oct 27, 2026 |
| 8-K |
Current report
Officer or director change
|
Aug 10, 2026 | Aug 10, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 4, 2026 | Aug 3, 2026 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Jul 23, 2026 | Jul 21, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 22, 2026 | Jul 21, 2026 |
| 8-K |
Current report
Officer or director change, Other events
|
Jun 26, 2026 | Jun 23, 2026 |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
May 18, 2026 | May 13, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 5, 2026 | May 4, 2026 |
| 8-K |
Current report
Officer or director change
|
Apr 7, 2026 | Apr 1, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 26, 2026 | Feb 25, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jan 22, 2026 | Jan 21, 2026 |
| 8-K |
Current report
Officer or director change
|
Dec 11, 2025 | Dec 9, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 4, 2025 | Nov 3, 2025 |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale
|
Sep 22, 2025 | Sep 19, 2025 |
| 8-K |
Current report
Material agreement, Other events
|
Sep 17, 2025 | Sep 15, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 5, 2025 | Aug 4, 2025 |
| 8-K |
Current report
Shareholder vote results, Other events
|
Jul 30, 2025 | Jul 24, 2025 |
| 8-K/A |
Amended current report
Results of operations, Regulation FD disclosure
|
Jul 17, 2025 | Jul 16, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 16, 2025 | Jul 16, 2025 |
| 8-K |
Current report
Results of operations
|
May 28, 2025 | May 27, 2025 |
| 8-K |
Current report
Other events
|
May 27, 2025 | May 27, 2025 |
| 8-K |
Current report
Restatement, Other events
|
May 13, 2025 | May 13, 2025 |
| 8-K |
Current report
Material agreement
|
May 12, 2025 | May 6, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 8, 2025 | May 7, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 16, 2025 | Apr 15, 2025 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Mar 7, 2025 | Mar 6, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 27, 2025 | Feb 26, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 7, 2024 | Nov 6, 2024 |
| 8-K |
Current report
Officer or director change
|
Aug 30, 2024 | Aug 27, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 6, 2024 | Aug 5, 2024 |
| 8-K |
Current report
Officer or director change
|
Aug 2, 2024 | Jul 31, 2024 |
| 8-K |
Current report
Material agreement, New debt
|
Jun 10, 2024 | Jun 4, 2024 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
May 9, 2024 | May 8, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 7, 2024 | May 6, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 3, 2024 | May 3, 2024 |
| 8-K |
Current report
Exit or restructuring costs
|
Apr 17, 2024 | Apr 11, 2024 |
| 8-K |
Current report
Results of operations
|
Mar 15, 2024 | Mar 15, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 27, 2024 | Feb 26, 2024 |
| 8-K |
Current report
Restatement
|
Feb 20, 2024 | Feb 20, 2024 |
| 8-K |
Current report
Material agreement, New debt
|
Jan 22, 2024 | Jan 16, 2024 |
| 8-K |
Current report
Officer or director change
|
Dec 6, 2023 | Dec 4, 2023 |
| 8-K |
Current report
Officer or director change
|
Dec 5, 2023 | Dec 1, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 7, 2023 | Nov 6, 2023 |
| 8-K |
Current report
Officer or director change, Bylaw or fiscal year change
|
Oct 24, 2023 | Oct 18, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Oct 17, 2023 | Oct 16, 2023 |
| 8-K |
Current report
Officer or director change
|
Sep 29, 2023 | Sep 25, 2023 |
| 8-K/A |
Amended current report
Results of operations
|
Aug 14, 2023 | Aug 6, 2023 |
| 8-K |
Current report
Restatement
|
Aug 10, 2023 | Aug 10, 2023 |
| 8-K/A |
Amended current report
Results of operations
|
Aug 10, 2023 | Aug 6, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 7, 2023 | Aug 6, 2023 |
| 8-K |
Current report
Officer or director change
|
Jun 28, 2023 | Jun 28, 2023 |
| 8-K |
Current report
Officer or director change
|
Jun 1, 2023 | May 26, 2023 |
| 8-K |
Current report
Officer or director change
|
May 30, 2023 | May 23, 2023 |
| 8-K |
Current report
Shareholder vote results
|
May 15, 2023 | May 10, 2023 |
| 8-K |
Current report
Results of operations
|
May 9, 2023 | May 8, 2023 |
| 8-K |
Current report
Results of operations
|
Apr 11, 2023 | Apr 10, 2023 |
| 8-K |
Current report
Officer or director change
|
Apr 3, 2023 | Mar 28, 2023 |
| 8-K |
Current report
Officer or director change
|
Mar 30, 2023 | Mar 27, 2023 |
| 8-K |
Current report
Results of operations
|
Feb 21, 2023 | Feb 21, 2023 |
| 8-K |
Current report
Agreement ended
|
Feb 8, 2023 | Feb 6, 2023 |
| 8-K |
Current report
Officer or director change
|
Jan 26, 2023 | Jan 20, 2023 |
| 8-K |
Current report
Other events
|
Jan 19, 2023 | Jan 17, 2023 |
| 8-K |
Current report
Material agreement
|
Dec 5, 2022 | Dec 1, 2022 |
| 8-K/A |
Amended current report
Results of operations
|
Nov 9, 2022 | Nov 7, 2022 |
| 8-K |
Current report
Results of operations
|
Nov 8, 2022 | Nov 7, 2022 |
| 8-K |
Current report
Other events
|
Oct 26, 2022 | Oct 24, 2022 |
| 8-K/A |
Amended current report
Results of operations
|
Oct 25, 2022 | Oct 24, 2022 |
| 8-K |
Current report
Results of operations
|
Oct 25, 2022 | Oct 24, 2022 |
| 8-K |
Current report
Other events
|
Oct 18, 2022 | Oct 18, 2022 |
| 8-K/A |
Amended current report
Officer or director change
|
Sep 30, 2022 | Jul 15, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2022 | Aug 3, 2022 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Jul 22, 2022 | Jul 18, 2022 |
| 8-K |
Current report
Acquisition or sale of assets, Officer or director change
|
Jul 15, 2022 | Jul 15, 2022 |
| 8-K |
Current report
Acquisition or sale of assets, Listing notice, Change to shareholder rights, Change in control, Officer or director change, Bylaw or fiscal year change, Regulation FD disclosure
|
Jul 8, 2022 | Jul 8, 2022 |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 7, 2022 | Jul 6, 2022 |
| 8-K | Current report | Jun 30, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Material agreement, New debt
|
May 23, 2022 | May 19, 2022 |
| 8-K |
Current report
Shareholder vote results
|
May 13, 2022 | May 11, 2022 |
| 8-K |
Current report
Results of operations
|
May 5, 2022 | May 4, 2022 |
| 8-K |
Current report
Material agreement, New debt
|
Apr 6, 2022 | Apr 1, 2022 |
| 8-K |
Current report
Results of operations
|
Feb 3, 2022 | Feb 2, 2022 |
| 8-K |
Current report
Shareholder vote results, Regulation FD disclosure
|
Jan 6, 2022 | Jan 6, 2022 |
| 8-K |
Current report
Other events
|
Dec 28, 2021 | Dec 28, 2021 |
| 8-K |
Current report
Officer or director change
|
Nov 29, 2021 | Nov 26, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 2, 2021 | Nov 1, 2021 |
| 8-K |
Current report
Results of operations
|
Nov 2, 2021 | Nov 1, 2021 |
| 8-K |
Current report
Results of operations
|
Oct 15, 2021 | Oct 14, 2021 |
| 8-K |
Current report
Officer or director change
|
Oct 7, 2021 | Oct 5, 2021 |
| 8-K |
Current report
Officer or director change
|
Sep 1, 2021 | Aug 29, 2021 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Aug 30, 2021 | Aug 30, 2021 |
| 8-K |
Current report
Results of operations
|
Aug 5, 2021 | Aug 4, 2021 |
| 8-K |
Current report
Shareholder vote results
|
May 18, 2021 | May 12, 2021 |
| 8-K |
Current report
Results of operations
|
May 6, 2021 | May 5, 2021 |
| 8-K/A |
Amended current report
Results of operations
|
Feb 26, 2021 | Feb 3, 2021 |
| 8-K |
Current report
Results of operations
|
Feb 4, 2021 | Feb 3, 2021 |
| 8-K |
Current report
Results of operations
|
Nov 3, 2020 | Nov 2, 2020 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2020 | Aug 5, 2020 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Jul 23, 2020 | Jul 21, 2020 |
| 8-K |
Current report
Shareholder vote results
|
May 15, 2020 | May 13, 2020 |
| 8-K |
Current report
Officer or director change
|
May 11, 2020 | May 11, 2020 |
| 8-K |
Current report
Results of operations
|
May 7, 2020 | May 6, 2020 |
| 8-K |
Current report
Results of operations
|
Feb 25, 2020 | Feb 25, 2020 |
| 8-K |
Current report
Results of operations
|
Feb 6, 2020 | Feb 5, 2020 |
| 8-K |
Current report
Results of operations
|
Oct 31, 2019 | Oct 30, 2019 |
| 8-K |
Current report
Results of operations
|
Oct 10, 2019 | Oct 9, 2019 |
| 8-K |
Current report
Results of operations
|
Sep 20, 2019 | Sep 20, 2019 |
| 8-K |
Current report
Listing notice
|
Aug 21, 2019 | Aug 15, 2019 |
| 8-K |
Current report
Results of operations
|
Jul 18, 2019 | Jul 17, 2019 |
| 8-K |
Current report
Shareholder vote results
|
May 9, 2019 | May 8, 2019 |
| 8-K |
Current report
Results of operations
|
Apr 18, 2019 | Apr 17, 2019 |
| 8-K |
Current report
Officer or director change
|
Mar 7, 2019 | Mar 6, 2019 |
| 8-K |
Current report
Results of operations
|
Jan 24, 2019 | Jan 23, 2019 |
| 8-K |
Current report
Other events
|
Dec 6, 2018 | Dec 6, 2018 |
| 8-K |
Current report
Results of operations
|
Oct 17, 2018 | Oct 16, 2018 |
| 8-K |
Current report
Results of operations
|
Jul 18, 2018 | Jul 17, 2018 |
| 8-K |
Current report
Shareholder vote results
|
May 10, 2018 | May 9, 2018 |
| 8-K |
Current report
Results of operations
|
Apr 18, 2018 | Apr 17, 2018 |
| 8-K |
Current report
Other events
|
Mar 21, 2018 | Mar 20, 2018 |
| 8-K |
Current report
Results of operations
|
Jan 17, 2018 | Jan 16, 2018 |
| 8-K |
Current report
Results of operations
|
Dec 29, 2017 | Dec 28, 2017 |
| 8-K |
Current report
Officer or director change
|
Nov 16, 2017 | Nov 11, 2017 |
| 8-K |
Current report
Results of operations
|
Oct 18, 2017 | Oct 17, 2017 |
Showing 123 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.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
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)
Other Telephone & Telegraph Apparatus companies
- Ciena Corp CIEN
- Fabrinet FN
- Clearfield, Inc. CLFD
- Audiocodes Ltd AUDC
- Franklin Wireless Corp FKWL
- Voip-pal.com Inc VPLM
- Clearone Inc CLRO
- DNA X, Inc. SONM
Source: SEC EDGAR filings. This is company-reported data, not investment advice.