On the Record · ADTRAN Holdings
ADTRAN Holdings subsidiaries, as it lists them
The subsidiaries ADTRAN Holdings lists in its latest annual report, with the jurisdiction of each, linked to the filing.
Subsidiaries it lists
| Subsidiary | Jurisdiction |
|---|---|
| ADTRAN Networks Pty. Ltd | Australia |
| ADTRAN Networks Comunicações Ltda. | Brazil |
| ADTRAN Canada, Inc. | Canada |
| ADTRAN d.o.o. | Croatia |
| ADTRAN, Inc. | State of Delaware |
| ADTRAN International, Inc. | State of Delaware |
| ADTRAN Networks Worldwide, Inc. | State of Delaware |
| ADTRAN Networks, LLC | State of Delaware |
| Bluesocket, Inc. | State of Delaware |
| BSI Sub, Inc. | State of Delaware |
| ADTRAN Oy | Finland |
| ADTRAN GmbH | Germany |
| ADTRAN Networks M.E.P.E. | Greece |
| ADTRAN Networks India Private Limited | India |
| ADTRAN Holdings Ltd. | Israel |
| ADTRAN S.R.L. | Italy |
| ADTRAN Networks Sdn Bhd | Malaysia |
| ADTRAN Networks S.A. de C.V. | Mexico |
| ADTRAN Peru S.R.L. | Peru |
| ADTRAN Sp. z.o.o. | Poland |
| ADTRAN s.r.o. | Slovakia |
| ADTRAN Proprietary Ltd. | South Africa |
| ADTRAN Switzerland GmbH | Switzerland |
| ADTRAN SARL | Tunisia |
| ADTRAN Europe Limited | United Kingdom |
| ADTRAN Networks and Services Egypt, LLC | Egypt |
| ADTRAN Networks New Zealand Ltd. | New Zealand |
| Adtran Technology GmbH | Germany |
| Adtran Networks SE | Germany |
| Adtran Networks North America, Inc. | State of Delaware |
| Adtran Networks (UK) Limited | United Kingdom |
| Oscilloquartz SA | Switzerland |
| Adtran Networks Spólka z.o.o. | Poland |
| Adtran Networks Israel Ltd. | Israel |
| Adtran Networks (Shenzhen) Ltd. | China |
| Oscilloquartz Finland Oy | Finland |
| Adtran Networks Service (Shenzhen) Ltd. | China |
| Adtran Networks Singapore Pte. Ltd. | Singapore |
| Adtran Networks Hong Kong Limited | China |
| Adtran Networks IT Solutions India Private Limited | India |
| Adtran Networks Servicos Brasil Ltda. | Brazil |
| Adtran Networks Japan Co., Ltd. | Japan |
| Adtran Networks AB | Sweden |
| Adtran Networks NA Holdings Inc. | State of Georgia |
| Adtran Networks Australia Pty Ltd. | Australia |
| Adtran Networks B.V. | Netherlands |
| Adtran Networks Canada, Inc. | Canada |
| ADVA Network Security GmbH | Germany |
From Exhibit 21 of the 10-K for 2025. Companies must list their significant subsidiaries there and may leave out smaller ones, so this is the company’s own list, not every entity it owns.
Read from ADTRAN Holdings’s annual reports (10-K for 2025, 10-K for 2024, 10-K for 2023) and the financial data it files with the SEC, as of 2026-02-26. Every quotation is word for word from the filing linked beside it; how these pages are built and checked. The full record is in its company data sheet.