Participation notification by DME Advisors and DME Capital Management

Press release                                                                 Regulated information

Brussels, September 8, 2026, 17:45 CEST

In line with Belgian transparency legislation (Law of May 2, 2007), DME Advisors and DME Capital Management recently sent to Solvay a transparency notification indicating that the 5% threshold was crossed downwards.

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
August 31, 2026	4.96%	0.00%	4.96%

The notification, dated September 4, 2026, contains the following information:

• Reason for the notification:
  • Acquisition or disposal of voting securities or voting rights
• Notified by: A parent undertaking or a controlling person
• Date on which the threshold is crossed: August 31, 2026
• Threshold of direct voting rights crossed: 5% downwards
• Denominator: 105,876,416
• Additional information: DME Advisors, LP and DME Capital Management, LP are the discretionary investment managers and exercise the voting rights at their discretion in the absence of specific instructions.
• Persons subject to the notification requirement:

Name	Address (for legal entities)
David Einhorn	140 East 45th Street, 24th Floor, New York, NY 10023, USA
DME Advisors GP, LLC	Corporation Trust Center, 1209 Orange Street, Wilmington, DE 19801, USA
DME Capital Management, LP	Corporation Trust Center, 1209 Orange Street, Wilmington, DE 19801, USA
DME Advisors, LP	Corporation Trust Center, 1209 Orange Street, Wilmington, DE 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

• 20260831 - Notification Greenlight
• Press release