Assystem

Major Shareholding Notification • Oct 16, 2024

Lock-up undertaking relating to Assystem shares ("Pacte Dutreil")

Paris La Défense, 16 October 2024, 5.35 p.m. (CEST) – Assystem S.A. has been informed that two collective agreements concerning the lock-up of Assystem shares, entered into within the framework of France's "Pacte Dutreil" regime were signed on 8 & 9 October 2024.

The characteristics of these agreements are set out below.

	"Pacte Dutreil"	"Pacte Dutreil"
Tax regime	Art. 787 B of the French Tax Code
Date of signature	8 October 2024	9 October 2024
Duration of the lock-up	2 years
undertaking
Contractual term of the	2 years
agreement
Terms and conditions of	Automatic renewal for three-month periods unless terminated
renewal
% of Assystem S.A.'s	Around 58.78 % (9,209,876 shares)
capital covered by the
agreement at the
signature date
% voting rights	75.85% at 30 September 2024
Names of signing parties	Dominique Louis, Chairman & CEO
who are directors and/or	Stéphane Aubarbier, Deputy CEO
officers of Assystem
Names of signing parties	HDL	HDL
that have close links with	HDL Development	HDL Development
Assystem's executives,	Mrs Julie Louis	AS CONSEIL
directors and/or officers		THELESIS
Names of signing parties
that are not executives,	HDL Development
directors or officers but
which hold at least 5% of
Assystem's capital and
voting rights

ABOUT ASSYSTEM

Assystem, one of the world's leading independent nuclear engineering companies, is committed to accelerating the energy transition. With more than 55 years of experience in highly regulated sectors with stringent safety and security constraints, the Group provides engineering and project management services as well as digital solutions and services to optimise the performance of complex infrastructure assets throughout their life cycle.

In its 12 countries of operation, Assystem's 7,700 experts are supporting energy transition. To achieve an affordable low carbon energy supply, Assystem is committed to the development of low carbon electricity (nuclear, renewables and electricity grids) and clean hydrogen. The Group is also helping drive the use of low carbon electricity in industrial sectors such as transportation. Assystem forms part of the Euronext Tech Leaders, CAC Small, CAC Mid & Small, CAC Industrials, CAC All-Tradable and CAC All-Share indices. To find out more, visit www.assystem.com

CONTACTS

Malène Korvin – Chief Financial Officer – mkorvin@assystem.com – Tel.: +33 (0)1 41 25 29 00 Anne-Charlotte Dagorn – Communications and Marketing Director – acdagorn@assystem.com - Tel.: +33 (0)6 83 03 70 29 Agnès Villeret – Komodo – Investor relations – agnes.villeret@agence-komodo.com – Tel. : +33 (0)6 83 28 04 15