Solvay SA — Major Shareholding Notification 2026

Apr 30, 2026

SOLVAY

Press release

Regulated information

Participation notifications by Citigroup Inc.

Brussels, April 30, 2026, 17:45 CEST

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
April 23, 2026	0%	-	0%
April 27, 2026	0.18%	3.03%	3.21%

The latest notification, dated April 30, 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: April 27, 2026
• Threshold of direct voting rights crossed: 3% upwards
• Denominator: 105,876,416
• Additional information: crossing above 3% which is the lowest threshold per the issuer's articles of association
• Persons subject to the notification requirement: Citigroup Inc., 1209 North Orange Street in Wilmington, Delaware 19801, USA

solvay.com

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SOLVAY

• Notified details:

A) Voting rights	Previous notification	After the transaction
	# of voting rights	# of voting rights		% of voting rights
Holders of voting rights		Linked to securities	Not linked to the securities	Linked to securities	Not linked to the securities
Citigroup Inc.	0	0		0.00%
Citigroup Global Markets Limited	0	189,211		0.15%
Subtotal		189,211		0.15%
TOTAL		189,211	0	0.18%	0.00%
B) Equivalent financial instruments	After the transaction
---	---	---	---	---	---
Holders of equivalent financial instruments	Type of financial instrument	Expiration date	Exercise period or date	# of voting rights that may be acquired if the instrument is exercised	% of voting rights
Citigroup Global Markets Limited	SWAPS		03.08.2026-24.02.202	1,290,613	1.22%
Citigroup Global Markets Funding Luxembourg S.C.A.	Option		16.02.2027	177,430	0.17%
Citigroup Global Markets Limited	Option		16.12.2026	37,807	0.04%
Citigroup Global Markets Limited	Option		22.12.2026	4,109	0.00%
Citigroup Global Markets Limited	Long Call		16.09.2026	180,000	0.14%
Citigroup Global Markets Limited	Short Put		16.12.2026-17.12.202	1,550,000	1.46%
TOTAL				3,269,939	3.63%

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.

solvay.com

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SOLVAY

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
investor.relations@solvay.com

Media relations

Peter Boelaert: +32 479 30 91 59
Laetitia Van Minnenbruggen: +32 484 65 30 47
media.relations@solvay.com

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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