Adtran Holdings, Inc. Morgan Stanley, Wilmington, Delaware, United States of America (USA)

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 distribution
30.07.2026 / 15:25 CET/CEST
Dissemination of a Voting Rights Announcement transmitted by EQS News – a service of EQS Group.
The issuer is solely responsible for the content of this announcement.

Notification of Major Holdings
1. Details of issuer

Name:	Adtran Holdings, Inc.
Street:	901 Explorer Boulevard
Postal code:	35806
City:	Huntsville United States
Legal Entity Identifier (LEI):	549300VV36J86CRRWF77

2. Reason for notification

X	Acquisition/disposal of shares with voting rights
X	Acquisition/disposal of instruments
	Change of breakdown of voting rights
	Other reason:

3. Details of person subject to the notification obligation

Legal entity: Morgan Stanley
City of registered office, country: Wilmington, Delaware, United States of America (USA)

4. Names of shareholder(s)
holding directly 3% or more voting rights, if different from 3.

5. Date on which threshold was crossed or reached:

24 Jul 2026

6. Total positions

	% of voting rights attached to shares (total of 7.a.)	% of voting rights through instruments (total of 7.b.1 + 7.b.2)	Total of both in % (7.a. + 7.b.)	Total number of voting rights pursuant to Sec. 41 WpHG
New	3.64 %	3.94 %	7.58 %	81452688
Previous notification	1.71 %	8.27 %	9.98 %	/

7. Details on total positions
a. Voting rights attached to shares (Sec. 33, 34 WpHG)

ISIN	Absolute		In %
	Direct (Sec. 33 WpHG)	Indirect (Sec. 34 WpHG)	Direct (Sec. 33 WpHG)	Indirect (Sec. 34 WpHG)
US00486H1059	0	2964709	0 %	3.64 %
Total	2964709		3.64 %

b.1. Instruments according to Sec. 38 (1) no. 1 WpHG

Type of instrument	Expiration or maturity date	Exercise or conversion period	Voting rights absolute	Voting rights in %
Right of recall over securities lending agreements	at any time	at any time	2153164	2.64 %
		Total	2153164	2.64 %

b.2. Instruments according to Sec. 38 (1) no. 2 WpHG

Type of instrument	Expiration or maturity date	Exercise or conversion period	Cash or physical settlement	Voting rights absolute	Voting rights in %
Convertible Bond	15.09.2030	at any time	Physical	1057043	1.3 %
			Total	1057043	1.3 %

8. Information in relation to the person subject to the notification obligation

	Person subject to the notification obligation is not controlled nor does it control any other undertaking(s) that directly or indirectly hold(s) an interest in the (underlying) issuer (1.).
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	%	%	5.36 %
–	%	%	%
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	%	%	5.36 %
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. In case of proxy voting according to Sec. 34 para. 3 WpHG
(only in case of attribution of voting rights in accordance with Sec. 34 para. 1 sent. 1 No. 6 WpHG)
Date of general meeting:
Holding total positions after general meeting (6.) after annual general meeting:

Proportion of voting rights	Proportion of instruments	Total of both
%	%	%

10. Other explanatory remarks:

The notification was triggered in part due to an acquisition of shares with voting rights in addition to a disposal of client securities over which Morgan Stanley & Co. LLC had a right of use.

Date

30 Jul 2026

30.07.2026 CET/CEST The EQS Distribution Services include Regulatory Announcements, Financial/Corporate News and Press Releases.

Language:	English
Company:	Adtran Holdings, Inc.
	901 Explorer Boulevard
	35806 Huntsville
	United States
Internet:	www.adtran.com
LEI Code:	549300VV36J86CRRWF77


End of News	EQS News Service

2374738 30.07.2026 CET/CEST