EQS Voting Rights Announcement: ADTRAN Holdings, Inc.Adtran Holdings, Inc.: Release according to Article 40, Section 1 of the WpHG [the German Securities Trading Act] with the objective of Europe-wide distribution15.10.2025 / 20:57 CET/CESTDissemination of a Voting Rights Announcement transmitted by EQS News - a service of EQS Group. Reason for notification X Acquisition/disposal of shares with voting rights Acquisition/disposal of instruments Change of breakdown of voting rights X Other reason:voluntary group notification with triggered threshold on subsidiary level3. Names of shareholder(s)holding directly 3% or more voting rights, if different from 3. X Full chain of controlled undertakings starting with the ultimate controlling natural person or legal entity:Name % of voting rights (if at least 3% or more) % of voting rights through instruments (if at least 5% or more) Total of both (if at least 5% or more) Morgan Stanley % % % Morgan Stanley Capital Management, LLC % % % Morgan Stanley Domestic Holdings, LLC % % % Morgan Stanley Capital Services LLC % % % - % % % Morgan Stanley % % % Morgan Stanley Capital Management, LLC % % % Morgan Stanley & Co. LLC % % % - % % % Morgan Stanley % % % Morgan Stanley International Holdings Inc. % % % Morgan Stanley International Limited % % % Morgan Stanley Investments (UK) % % % Morgan Stanley & Co. International plc % % % - % % % Morgan Stanley % % % Morgan Stanley Capital Management, LLC % % % Morgan Stanley & Co. LLC % % % Prime Dealer Services Corp. % % % - % % % Morgan Stanley % % % Morgan Stanley Capital Management, LLC % % % Morgan Stanley Bank, N.A. % % % - % % % Morgan Stanley % % % Morgan Stanley Capital Management, LLC % % % Morgan Stanley Smith Barney LLC % % %9.