ADTRAN Holdings, Inc.

Adtran was founded in 1985 by Mark C. Smith, Lonnie S. McMillian, and Larry Owen, and began operations in 1986, following the AT&T divestiture of the Regional Bell Operating Companies (RBOCs). It supplied network equipment to both the RBOCs and independent telephone companies in the United States.

In 2006, Adtran acquired Luminous Networks, a manufacturer of access network equipment. In 2011, it acquired Bluesocket, a maker of enterprise Wi-Fi equipment based in Burlington, Massachusetts. In 2012, it acquired Nokia Siemens Networks ' broadband access business based in Germany. In 2016, it acquired CommScope 's active fiber business. In 2018, Adtran acquired connected home software provider SmartRG from Vancouver, WA.

In 2021, Adtran entered into a business combination with ADVA Optical Networking, a cloud and mobile services networking company based in Munich and Meiningen in Germany. In 2022, Adtran acquired the remaining shares of Cambridge Communication Systems (CCS) Limited, a developer of wireless backhaul and transport systems for small cells. It offers an mmWave Gigabit fiber extension system along with web-based management software for planning, configuring and monitoring networks. In 2024, Adtran self-certified itself " Buy America -compliant" with the U.S. Department of Commerce. This list acts as a reference for communications service providers applying for Broadband Equity Access and Deployment (BEAD) funding.