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Alten Major Shareholding Notification 2025

Nov 12, 2025

1103_dva_2025-11-12_6b0ce3c4-05ad-4f3e-b74d-d8d219e3c159.pdf

Major Shareholding Notification

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PRESS RELEASE

Boulogne-Billancourt, 12th November 2025 5:45 pm

Information pursuant to articles L. 233-8-II of French Commercial code and 223-16 of the AMF General Regulation in connection with the number of outstanding shares in the Company and related voting rights

Company: ALTEN SA (the "Company") Stock-exchange: Euronext Paris

Compartment: A

ISIN Code : FR0000071946

Date Total number of sharesconstituting the share capital Total number of theoreticalvoting rights
31st October 2025 35 343 326* 40 812 088

* Ordinary shares

Article 9 of ALTEN's Articles of Association provides that any shareholder acting alone or in concert, in addition to the thresholds set forth in Article L. 233-7 of the French Commercial code, that crosses the threshold (upwards or downwards) of 3% of the share capital or voting rights must inform the Company of such crossing. This information must be notified by registered letter with acknowledgement of receipt within 15 days from the date on which such threshold was crossed.

About ALTEN

For more information: www.alten.com/investisseurs

Journalists' details: [email protected]

As a European Leader in Engineering and Technology Consulting (ETC), ALTEN carries out design and research projects for Technical and IT divisions of major clients in industry, telecoms and services.

ALTEN's stock is listed in compartment A of the Euronext Paris market (ISIN FR000001946); it is part of the SBF 120, the IT CAC 50 index and MIDCAP100, and is eligible for the deferred Settlement Service (SRD).