Solvay SA

Major Shareholding Notification • Mar 29, 2021

Participation notification by Solvac SA

Brussels, March 29, 2021, 08:30 CET - According to the Belgian transparency legislation in force (Law of May 2, 2007), SOLVAC SA (Rue des Champs Elysées 43 – 1050 Brussels – Belgium) has been notified by SSOM, an affiliate of Solvay SA, that it has crossed downwards the statutory declaration threshold of 3% of the existing voting rights emitted by Solvay SA, with a total of 2.99% (2.27% of direct voting rights + 0.72% of other financial instruments). Solvac SA has notified Solvay SA that, on March 19, 2021 the combined holding by Solvac and SSOM reached 33.80% of the existing voting rights. Shares held by SSOM are held as part of the Group's strategy to hedge the plan linked to stock options granted to senior executives of the Group.

The notification, dated March 24, 2021, contains the following information:

• ● Reason for the notification: acquisition or disposal of voting securities or voting rights
• ● Notified by: Solvac SA (Rue des Champs Elysées 43 1050 Brussels Belgium)
• ● Date on which the threshold is crossed: March 19, 2021
• ● Threshold of direct voting rights crossed: 3% downwards
• ● Denominator: 105,876,416
• ● Persons subject to the notification requirement:

Name	Address (for legal entities)
Solvac SA	Rue de Champs Elysées 43 – 1050 Brussels – Belgium
Solvay SA	Rue de Ransbeek 310 – 1120 Neder-Over-Heembeek – Belgium
Solvay Chemicals International SA	Rue de Ransbeek 310 – 1120 Neder-Over-Heembeek – Belgium
Solvay Stock Option Management SRL	Rue de Ransbeek 310 – 1120 Neder-Over-Heembeek – Belgium

● 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
Solvac SA	32,621,583	32,621,583		30.81%
Solvay SA		0		0.00%
Solvay Chemicals International SA		0		0.00%
Solvay Stock Option Management SRL	2,467,193	2,400,906		2.27%
Subtotal		35,022,489	0	33.08%	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	Settlement
Solvay Stock Option Management SRL	Call option	24/03/2021		106,400	0.10%	Physical
Solvay Stock Option Management SRL	Call option	23/02/2022		95,760	0.09%	Physical
Solvay Stock Option Management SRL	Call option	24/02/2023		87,214	0.08%	Physical
Solvay Stock Option Management SRL	Call option	23/02/2024		190,500	0.18%	Physical
Solvay Stock Option Management SRL	Call option	21/02/2025		80,000	0.08%	Physical
Solvay Stock Option Management SRL	Call option	27/02/2026		100,000	0.09%	Physical
Solvay Stock Option Management SRL	Call option	26/02/2027		108,500	0.10%	Physical
Subtotal				768,374	0.73%

Total (A & B)		# of voting rights	% of voting rights
		35,790,863	33.80%

• ● Full chain of control: SSOM is owned by Solvay Chemicals International SA (99.99%) and Solvay Participations Belgique SA. SOLVAC SA is presumed to exercise de facto control over Solvay SA, and therefore SSOM, on the basis of Article 1.14, §3 of the Belgian code of companies and associations.
• ● Additional information: the threshold of 3% has been crossed downwards by Solvay Stock Options Management SRL. The unrounded percentage of voting rights held by Solvay Stock Options Management SRL after the transaction is 2.993376%.

Transparency notifications are available on the Investor Relations Section of Solvay's website.

About Solvay

Solvay is a science company whose technologies bring benefits to many aspects of daily life. With more than 23,000 employees in 64 countries, Solvay bonds people, ideas and elements to reinvent progress. The Group seeks to create sustainable shared value for all, notably through its Solvay One Planet plan crafted around three pillars: protecting the climate, preserving resources and fostering better life. The Group's innovative solutions contribute to safer, cleaner, and more sustainable products found in homes, food and consumer goods, planes, cars, batteries, smart devices, health care applications, water and air purification systems. Founded in 1863, Solvay today ranks among the world's top three companies for the vast majority of its activities and delivered net sales of €8.9 billion in 2020. Solvay is listed on Euronext Brussels (SOLB) and Paris and in the United States, where its shares (SOLVY) are traded through a Level I ADR program. Learn more at www.solvay.com.

Nathalie van Ypersele +32 478 20 10 62 nathalie.vanypersele@solvay.com

Brian Carroll +32 471 70 54 72 brian.carroll@solvay.com

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investor.relations@solvay.com

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