Participation notification by Solvac SA.
Brussels, Belgium - February 19, 2024 - 8:30 CET
According to Belgian transparency legislation (Law of May 2, 2007), Solvac SA (Rue de Champs Elysées 43 - 1050 Bruxelles, Belgium) sent to Syensqo the following transparency notification indicating that it crossed the 30%
regulatory threshold was exceeded. Here is a summary of the move:
+----------------------+------------------------+-----------------------+------+
| | | Equivalent financial | | | Date on which the |Voting rights after the | instruments after the | | |threshold was crossed | transaction | transaction |Total | +----------------------+------------------------+-----------------------+------+
| December 11, 2023 | 30.81% | - |30.81%| +----------------------+------------------------+-----------------------+------+
The notification, dated February 15, 2024, contains the following information:

  * Reason for the notification: Holding of voting securities upon first
    admission to trading
  * Notified by Solvac SA: A parent undertaking or a controlling person
  * Date on which the threshold is crossed: December 11, 2023
  * Threshold of direct voting rights crossed: 30% upwards
  * Denominator: 105,876,417
  * Additional information: On the basis of Solvac SA's shareholding in Solvay
    SA prior to the partial demerger (last notification dated March 24, 2021
    relating to the crossing of a threshold on March 19, 2021), Solvac SA held
    30.81% of the share capital of Solvay SA and therefore holds 30.81% of the
    share capital of Syensqo at the time of the partial demerger.

Transparency notifications and the full chain of controlled undertakings through
which the holding is effectively held is available on the Investor Relations
Section (https://www.syensqo.com/en/investors/regulated-information) of
Syensqo's website.
Contacts

 Media relations                         Investor relations
 Nathalie van Ypersele                   Sherief Bakr
 +32 478 20 10 62                        + 44 7920 575 989
 Perrine Marchal                         Bisser Alexandrov
 +32 478 32 62 72                        +33 607 635 280
 Laetitia Schreiber                      Imtiyaz Lokhandwala
 +32 487 74 38 07                        +1 609 860 3959
                                         investor.relations@syensqo.com
                                         (mailto:investor.relations@syensqo.com
 media.relations@syensqo.com             )

(mailto:media.relations@syensqo.com)
About Syensqo
Syensqo is a science company developing groundbreaking solutions that enhance the way we live, work, travel and play. Inspired by the scientific councils which Ernest Solvay initiated in 1911, we bring great minds together to push the
limits of science and innovation for the benefit of our customers, with a diverse, global team of more than 13,000 associates.
Our solutions contribute to safer, cleaner, and more sustainable products found in homes, food and consumer goods, planes, cars, batteries, smart devices and health care applications. Our innovation power enables us to deliver on the ambition of a circular economy and explore breakthrough technologies that advance humanity.
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