EQS Voting Rights Announcement: AIXTRON SE

AIXTRON SE: Release according to Article 40, Section 1 of the WpHG [the German Securities Trading Act] with the objective of Europe-wide distribution

08.05.2026 / 10:00 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: AIXTRON SE Street: Dornkaulstraße 2 Postal code: 52134 City: Herzogenrath
Germany Legal Entity Identifier (LEI): 5299004UJ4D51M25LD67

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

Legal entity: UBS Group AG
City of registered office, country: Zurich, Switzerland

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:

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 3.55 % 0.51 % 4.05 % 113456120 Previous notification 2.64 % 0.51 % 3.15 % /

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) DE000A0WMPJ6 0 4022928 0 % 3.55 % Total 4022928 3.55 %

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 Use over Shares At any time 118392 0.1 % Right to Recall of Lent Shares At any time 30795 0.03 %     Total 149187 0.13 %

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 % Right of Use over Reverse Convertibles At any time Cash 23005 0.02 % Convertible Bond (DE000A460HP9) 23/04/2031 03/06/2026-31/03/2031 Physical 399007 0.35 % Swaps On Baskets 29/09/2027 At any time Cash 3035 0 %       Total 425047 0.37 %

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) UBS Group AG % % % UBS AG % % % UBS Asset Management AG % % % UBS Asset Management (Europe) S.A. % % % – % % % UBS Group AG % % % UBS AG % % % UBS Asset Management AG % % % UBS Asset Management Holding (No. 2) Ltd % % % UBS Asset Management Holding Ltd % % % UBS Asset Management (UK) Ltd % % % – % % % UBS Group AG % % % UBS AG % % % UBS Bank (Canada) % % % – % % % UBS Group AG % % % UBS AG % % % UBS Asset Management AG % % % UBS Asset Management Switzerland AG % % % UBS Fund Management (Switzerland) AG % % % – % % % UBS Group AG % % % UBS AG % % % UBS Europe SE % % % UBS La Maison de Gestion % % % – % % % UBS Group AG % % % UBS AG % % % UBS Switzerland AG % % %

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

08.05.2026 CET/CEST The EQS Distribution Services include Regulatory Announcements, Financial/Corporate News and Press Releases.
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