Participation notification by Citigroup Inc.

Press release  -  Regulated information

Brussels, September 25, 2026, 17:45 CEST

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

Here is a summary of the notification:

Date on which the threshold is crossed	Voting rights after the transaction	Equivalent financial instruments after the transaction	Total
September 21, 2026	-	-	-

The notification, dated September 22, 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: September 21, 2026
• Threshold of direct voting rights crossed: 3% downwards
• Denominator: 105,876,416
• 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: [phone]
Vincent Toussaint: [phone]
Charlotte Vandevenne: [phone]
[e-mail]

Media relations

Peter Boelaert: [phone]
Laetitia Van Minnenbruggen: [phone]
[e-mail]

About Solvay 

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 around 8,400 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 €4.3 billion in net sales in 2025, 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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Attachments

• 20260922 - Notification Citi
• Press release