ATENOR — Proxy Solicitation & Information Statement 2026

Mar 24, 2026

ATENOR UPGRADE THE FUTURE

VOTING BY CORRESPONDENCE

Ordinary General Meeting and Extraordinary General Meeting of the shareholders of 24 April 2026

The undersigned (the « Shareholder »)

Family name – First name: _______

Residence: ____________

Company name and legal form: ______

Registered office: __________

Enterprise number: ________

Owner of: __ registered shares and/or ____ dematerialised shares of Atenor SA (the « Company »)

Hereby casts his/her vote by correspondence on the items set out on the agenda of the Ordinary General Meeting and the Extraordinary General Meeting of Atenor SA, which will be held on 24 April 2026, in accordance with the voting instructions set out below.

AGENDA OF THE ORDINARY GENERAL MEETING

1. Presentation of the annual accounts and the consolidated accounts, the Board of Directors' management report and the reports of the Statutory Auditor for the financial year ended 31 December 2025

This item is for presentation purposes only and does not require a vote

1. Approval of the annual accounts and approval of the allocation of results

Proposed resolution:

a) Approval of the annual accounts for the financial year ended 31 December 2025.

The Shareholder votes as follows:
☐ in favour ☐ against ☐ abstention

b) Approval of the allocation of results.

The Shareholder votes as follows:
☐ in favour ☐ against ☐ abstention

It is specified that the remuneration of the Directors does not form part of the allocation of the results for the financial year and has been accounted for appropriately in the Company's accounts as at 31 December 2025. The General Meeting is invited to take note thereof.

1. Discharge of the Directors and of the Statutory Auditor

Proposed resolution:

a) Granting discharge to the Directors from any liability arising from the performance of their mandates during the financial year 2025.

The Shareholder votes as follows:
☐ in favour ☐ against ☐ abstention

b) Granting discharge to the Statutory Auditor from any liability arising from the performance of its mandate during the financial year 2025.

The Shareholder votes as follows:
☐ in favour ☐ against ☐ abstention

1. Appointments / Renewals of mandates and election of domicile

The mandates of Mr John Penning and of Trionna SRL, represented by Ms Laure le Hardý de Beaulieu, will expire at the close of the Ordinary General Meeting of 24 April 2026.

ATENOR SA - Avenue Reine Astrid 92 - B-1310 La Hulpe - Tél. +32 (0)2 387 22 99 - RPM Brabant wallon

N° Entreprise TVA BE 0403 209 303 - info@atenor.eu - www.atenor.eu

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AENOR UPGRADE THE FUTURE

Mr John Penning has informed the Board of Directors that he does not seek the renewal of his mandate expiring at the close of the General Meeting. The General Meeting is invited to take note of this information and to thank Mr John Penning for the performance of his mandate.

Proposed resolution:

Upon recommendation of the Nomination and Remuneration Committee and upon proposal of the Board of Directors, the General Meeting is invited to decide:

a) to renew the mandate of Trionna SRL, represented by Ms Laure le Hardy de Beaulieu, as an independent nonexecutive Director, for a term of three years ending at the close of the Ordinary General Meeting to be held to approve the accounts for the financial year 2028. This mandate may be remunerated in accordance with the Company's remuneration policy;

The Shareholder votes as follows: ☐ in favour ☐ against ☐ abstention

b) to appoint Mr Lionel de Hemptinne as a nonexecutive Director, for a term of three years ending at the close of the Ordinary General Meeting to be held to approve the accounts for the financial year 2028. This mandate may be remunerated in accordance with the Company's remuneration policy;

The Shareholder votes as follows: ☐ in favour ☐ against ☐ abstention

c) to set the election of domicile of the Directors and of the Statutory Auditor at the Company's registered office for all matters relating to the performance of their mandates, in accordance with Article 2:54 of the Belgian Code of Companies and Associations, without prejudice to their right to elect a separate domicile in accordance with the applicable legal provisions.

The Shareholder votes as follows: ☐ in favour ☐ against ☐ abstention

5. Remuneration report for the financial year 2025

Proposed resolution (advisory vote – Article 7:149 of the Belgian Code of Companies and Associations):

The General Meeting is invited to approve, by way of an advisory vote, the remuneration report relating to the financial year 2025, which forms a specific part of the corporate governance statement included in the annual report.

The Shareholder votes as follows: ☐ in favour ☐ against ☐ abstention

6. Powers

Proposed resolution:

To grant all powers to the Board of Directors, with power of subdelegation and substitution, for the implementation of the resolutions adopted by the Ordinary General Meeting and for the completion of all related formalities.

The Shareholder votes as follows: ☐ in favour ☐ against ☐ abstention

AGENDA OF THE EXTRAORDINARY GENERAL MEETING

1. Renewal of the authorisations granted to the Board of Directors regarding the acquisition, pledging and disposal of treasury shares, profitsharing certificates or related certificates in the event of serious and imminent harm

Proposed resolution:

a) Renewal of the authorisations granted to the Board of Directors to acquire, pledge or dispose of treasury shares, profitsharing certificates or related certificates in the event of serious and imminent harm to the Company;

The Shareholder votes as follows: ☐ in favour ☐ against ☐ abstention

b) Amendment of the last paragraph of Article 7.A.2 of the Articles of Association to be replaced by the following wording:

"The Board of Directors is authorised to acquire and pledge treasury shares, profitsharing certificates or related certificates where such acquisition or pledging is necessary to prevent serious and imminent harm to the Company. This authorisation is granted for a period of three years as from the publication of the authorisation granted on 24 April 2026."

The Shareholder votes as follows: ☐ in favour ☐ against ☐ abstention

Atenor – Voting by correspondence OGM & EGM – 24 April 2026

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AENOR UPGRADE THE FUTURE

c) Amendment of Article 7.B.2 of the Articles of Association to be replaced by the following wording:
"The Board of Directors is authorised to dispose of treasury shares, profitsharing certificates or related certificates to one or more identified persons, whether or not they are members of staff. The Board of Directors is authorised to dispose of treasury shares, profitsharing certificates or related certificates in order to prevent serious and imminent harm to the Company. This authorisation is granted for a period of three years as from the publication of the authorisation granted on 24 April 2026."
The Shareholder votes as follows:
☐ in favour
☐ against
☐ abstention

It is specified that the amendments referred to under this item 1 exclusively concern the renewal of the authorisation applicable in the event of serious and imminent harm and do not affect or amend the other existing authorisations granted to the Board of Directors in respect of treasury shares, which remain fully unchanged. The General Meeting is invited to take note thereof.

1. Powers

Proposed resolution:
To grant all powers to the Board of Directors, with power of subdelegation and substitution, for the implementation of the resolutions adopted by the Extraordinary General Meeting and for the completion of all related formalities, as well as all powers to Notary Vigneron to ensure the coordination of the Company's Articles of Association.
The Shareholder votes as follows:
☐ in favour
☐ against
☐ abstention

INCLUSION OF ITEMS ON THE AGENDA:
In accordance with Article 7:130 of the Belgian Code of Companies and Associations, the votes cast by correspondence shall not be taken into account for items or proposed resolutions that are validly added to the agenda after the publication of the convening notice, which is available free of charge on the Company's website www.atenor.eu.

Done at __ on __ 2026

Signature

Atenor – Voting by correspondence OGM & EGM – 24 April 2026