Adtran Holdings, Inc. Israel Englander

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
25.08.2026 / 19:00 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
	Acquisition/disposal of instruments
	Change of breakdown of voting rights
	Other reason:

3. Details of person subject to the notification obligation

Natural person (first name, surname): Israel Englander
Date of birth: 30 Sep 1948

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:

20 Aug 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	2.99 %	0.01 %	2.999355423502 %	81481407
Previous notification	3.07 %	0.002315122258 %	3.07 %	/

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	2434724	0.00 %	2.99 %
Total	2434724		2.99 %

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 %
			0	0.00 %
		Total	0	0.00 %

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 %
Swap	02/03/2028	n/a	Cash	9193	0.01 %
			Total	9193	0.01 %

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)
Israel Englander	%	%	%
Millennium Group Management LLC	%	%	%
Millennium International Management LP	%	%	%
–	%	%	%
Israel Englander	%	%	%
Millennium Group Management LLC	%	%	%
Millennium Management LLC	%	%	%
Millennium Partners LP	%	%	%
Integrated Holding Group LP	%	%	%
Integrated Core Strategies (US) LLC	%	%	%
–	%	%	%
Israel Englander	%	%	%
Millennium Group Management LLC	%	%	%
Millennium Management LLC	%	%	%
Millennium Partners LP	%	%	%
Integrated Holding Group LP	%	%	%
Integrated Assets, Ltd	%	%	%
–	%	%	%
Israel Englander	%	%	%
Millennium Group Management LLC	%	%	%
Millennium Management LLC	%	%	%
Millennium Partners LP	%	%	%
Integrated Holding Group LP	%	%	%
Integrated Assets II 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:

Date

25 Aug 2026

25.08.2026 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

2388600 25.08.2026 CET/CEST