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

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
distribution

08.11.2026 / 10:52 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.

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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

          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: The Goldman Sachs Group, Inc.
   City of registered office, country: Wilmington, DE, 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:

03 Nov 2026

6. Total positions

               % of voting  % of voting rights   Total of  Total number of
           rights attached             through  both in %    voting rights
                 to shares  instruments (total    (7.a. +      pursuant to
           (total of 7.a.)   of 7.b.1 + 7.b.2)      7.b.)     Sec. 41 WpHG
  New               0.51 %              4.39 %     4.91 %         81495825
  Previo-           0.33 %              5.11 %     5.45 %                /
  us
  notifi-
  cation

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

    ISIN            Absolute                 In %
                  Direct (Sec.  Indirect  Direct (Sec.  Indirect (Sec.
                      33 WpHG)  (Sec. 34      33 WpHG)        34 WpHG)
                                   WpHG)
    US00486H1059             0    418073           0 %          0.51 %
    Total            418073                 0.51 %

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

    Type of     Expiration or  Exercise or    Voting     Voting
    instrument  maturity date  conversion     rights  rights in
                               period       absolute          %
    Right To    Open                         1948050     2.39 %
    Recall
    Right Of    Open                         1595400     1.96 %
    Use
                               Total         3543450     4.35 %

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

    Type of    Expiration   Exercise or  Cash or       Voting  Voting
    instrume-  or maturity  conversion   physical      rights  rights
    nt         date         period       settlement  absolute    in %
    Swap       13.10.2031                Cash           37653  0.05 %
                                         Total          37653  0.05 %

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       % of voting rights  Total of both
                   rights (if at  through instruments (if   (if at least
                     least 3% or     at least 5% or more)    5% or more)
                           more)
    The Goldman                %                        %              %
    Sachs Group,
    Inc.
    GSAM Holdings              %                        %              %
    LLC
    Goldman Sachs              %                        %              %
    Asset
    Management,
    L.P.
    -                          %                        %              %
    The Goldman                %                        %              %
    Sachs Group,
    Inc.
    Goldman Sachs              %                        %              %
    Bank USA
    Goldman Sachs              %                        %              %
    Bank Europe
    SE
    -                          %                        %              %
    The Goldman                %                        %              %
    Sachs Group,
    Inc.
    Folio                      %                        %              %
    Financial,
    Inc.
    Folio                      %                        %              %
    Investments,
    Inc.
    -                          %                        %              %
    The Goldman                %                        %              %
    Sachs Group,
    Inc.
    Goldman Sachs              %                        %              %
    & Co. LLC
    -                          %                        %              %
    The Goldman                %                        %              %
    Sachs Group,
    Inc.
    Goldman Sachs              %                        %              %
    (UK) L.L.C.
    Goldman Sachs              %                        %              %
    Group UK
    Limited
    Goldman Sachs              %                        %              %
    International

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    Proportion of    Total of
                   rights      instruments        both
                        %                %           %

10. Other explanatory remarks:



Date

06 Nov 2026


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08.11.2026 CET/CEST The EQS Distribution Services include Regulatory
Announcements, Financial/Corporate News and Press Releases.
View original content:
https://eqs-news.com/?origin_id=081b372a-db5a-11f1-b46d-066675bb9927&lang=en

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   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
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2430430 08.11.2026 CET/CEST