Participation notifications by Citigroup Inc.

Press release                                                                  Regulated information Brussels, January 28, 2026, 17:45 CET

In line with Belgian transparency legislation (Law of May 2, 2007), Citigroup Inc. recently sent to Solvay the following transparency notifications indicating that they crossed the threshold of 3%.  Here is a summary of the notifications:

Date on which the threshold is crossed

Voting rights after the transaction

Equivalent financial instruments after the transaction

Total

January 19, 2026

0.56%

2.51

3.06%

January 22, 2026

0.00%

0.00%

0.00%

Date on which the threshold is crossed

Voting rights after the transaction

Equivalent financial instruments after the transaction

The latest notification, dated January 27, 2026, contains the following information:

Reason for the notification:

Acquisition or disposal of voting securities or voting rights

Downward crossing of the lowest threshold

Notified by: A parent undertaking or a controlling person

Date on which the threshold is crossed: January 22, 2026

Threshold of direct voting rights crossed: 3% downwards

Persons subject to the notification requirement: Citigroup Inc., 1209 North Orange Street in Wilmington, Delaware 19801, USA

Transparency notifications and the full chain of controlled undertakings through which the holding is effectively held are available on the Investor Relations Section of Solvay’s website.

Contacts Investor relations Geoffroy d’Oultremont: +32 478 88 32 96 Vincent Toussaint: +33 6 74 87 85 65 Charlotte Vandevenne: +32 471 68 01 66 [email protected]

Media relations Peter Boelaert: +32 479 30 91 59 Laetitia Van Minnenbruggen: +32 484 65 30 47 [email protected]

Solvay, a pioneering chemical company with a legacy rooted in founder Ernest Solvay’s pivotal innovations in the soda ash process, is dedicated to delivering essential solutions globally through its workforce of circa 9,000 employees. Since 1863, Solvay harnesses the power of chemistry to create innovative, sustainable solutions that answer the world’s most essential needs such as purifying the air we breathe and the water we drink, preserving our food supplies, protecting our health and well-being, creating eco-friendly clothing, making the tires of our cars more sustainable and cleaning and protecting our homes. Solvay’s unwavering commitment drives the transition to a carbon-neutral future by 2050, underscoring its dedication to sustainability and a fair and just transition. As a world-leading company with €4.7 billion in net sales in 2024, Solvay is listed on Euronext Brussels and Paris (SOLB). For more information about Solvay, please visit solvay.com or follow Solvay on Linkedin.

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20260119 – Notification Citi

20260122 – Notification Citi

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