Adtran Holdings, Inc. ADTN

What this company does

ADTRAN Holdings, Inc. provides networking and communications platforms, software, systems and services focused on the metro optical transport, data center interconnect, and broadband access market, serving a domestic and international customer base that includes large, medium and small Service Providers, alternative Service Providers such as utilities, municipalities and fiber overbuilders, cable/MSOs, SMBs and distributed enterprises, and federal, state and local government agencies. Its global headquarters are located at Cummings Research Park in Huntsville, Alabama. During 2025, one customer, an international Service Provider, accounted for more than 10.0% of its revenue, and its next five largest customers accounted for 20.4% of revenue. As of December 31, 2025, it had 3,338 total employees, of which 3,201 were full-time and 137 were part-time. The company operates two reportable segments, Network Solutions and Services & Support. The Network Solutions segment includes hardware and software products supporting the company's Subscriber, Access and Aggregation, and Optical Networking Solutions offerings. The Services & Support segment offers network design, implementation, maintenance and cloud-hosted services supporting those same product categories. It began operations in January 1986.

Written from the business description in ADTRAN Holdings, Inc.'s annual report to the U.S. Securities and Exchange Commission, filed 26 February 2026. Every sentence was checked against that document before publication.