ADTRAN Holdings, Inc. (NASDAQ:ADTN) ("ADTRAN Holdings" or the "Company") announced today that the Company will release its financial results for the third quarter 2025 after the market close on Monday, November 3, 2025, at https://investors.adtran.com/. The Company will conduct a conference call on Tuesday, November 4, 2025, to discuss the results for the quarter.

What: ADTRAN Holdings, Inc. Earnings Call

When: 9:30 a.m. Central Time (4:30 p.m. Central European Time) on Tuesday, November 4, 2025

The Company will webcast this conference call, or you may dial in to participate. To listen, visit the events and presentations section of ADTRAN Holdings, Inc. Investor Relations site at https://events.q4inc.com/attendee/495431650 approximately 10 minutes before the start of the call, or you may dial 1-888-330-2391 (Toll-Free US) or 1-240-789-2702, and use Conference ID 8936454. An online replay of the conference call and a transcript of the call will be available on the Investor Relations site shortly following the call and will remain available for at least 12 months.

About Adtran

ADTRAN Holdings, Inc. (NASDAQ:ADTN) is the parent company of Adtran, Inc., a leading global provider of open, disaggregated networking and communications solutions that enable voice, data, video and internet communications across any network infrastructure. From the cloud edge to the subscriber edge, Adtran empowers communications service providers around the world to manage and scale services that connect people, places and things. Adtran solutions are used by service providers, private enterprises, government organizations and millions of individual users worldwide. ADTRAN Holdings, Inc. is also the majority shareholder of Adtran Networks SE, formerly ADVA Optical Networking SE. Find more at Adtran.com, LinkedIn and X.

Published by

ADTRAN Holdings, Inc.

www.adtran.com

View source version on businesswire.com: https://www.businesswire.com/news/home/20251016457975/en/

For media

Gareth Spence

+44 1904 699 358

public.relations@adtran.com

For investors

Peter Schuman, IRC

+1 256 963 6305

investor.relations@adtran.com

ADTRAN Holdings, Inc. to release third quarter 2025 financial results on November 3, 2025