• UBS Group stake in Adtran rose to 5.88% on May 1, from below disclosure threshold.
• Equity holding accounted for 1.89% of voting rights, with 3.99% held through instruments.
• Total voting rights referenced in disclosure were 80,971,042.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. ADTRAN Holdings Inc. published the original content used to generate this news brief via EQS News, a service of EQS Group AG (Ref. ID: PVR_2322762_en), on May 06, 2026, and is solely responsible for the information contained therein.