Press release Regulated information

Participation notification by Morgan Stanley

Brussels, August 26, 2025, 17h45 CEST

In line with Belgian transparency legislation (Law of May 2, 2007), Morgan Stanley recently sent to Solvay the following transparency notification, indicating that Morgan Stanley & Co. International plc, a wholly owned subsidiary of Morgan Stanley, has crossed the threshold of 3%. Morgan Stanley's total holding in Solvay remains above the 3% threshold previously disclosed.

Here is a summary of the notification:

Date on which the threshold was crossed	Voting rights after the transaction	Equivalent financial instruments after the transaction	Total
August 18, 2025	0.01%	3.16%	3.17%

The notification, dated August 22, 2025, contains the following information:

Reason for the notification:
- Acquisition or disposal of financial instruments that are treated as voting securities
Notified by: A parent undertaking or a controlling person
Date on which the threshold is crossed: August 18, 2025
Threshold of direct voting rights crossed: 3% downwards
Denominator: 105,876,416
Additional information: Morgan Stanley's total holding in Solvay remains above the 3% threshold previously disclosed; however, this notification is being made on the basis that Morgan Stanley & Co. International plc, a wholly owned subsidiary of Morgan Stanley, has crossed a relevant threshold in its own right.
Persons subject to the notification requirement: Morgan Stanley c/o The Corporation Trust Company (DE), Corporation Trust Center, 1209 Orange Street, Wilmington, Delaware 19801, USA

● 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
Morgan Stanley		0	0	0.00%	0.00%
Morgan Stanley & Co. LLC		20	0	0.00%	0.00%
Morgan Stanley & Co. International plc		10.312	0	0.01%	0.00%
Subtotal		10,332		0.01%
	TOTAL	10,332	0	0.01%	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
Morgan Stanley & Co. International plc	Equity Call Options		19/12/2025 At any time	14,900	0.01%	physical
Morgan Stanley & Co. International plc Equity Call Options			19/06/2026 At any time	201,200	0.19%	physical
Morgan Stanley & Co. International plc	Equity Call Options		18/12/2026 At any time	283,100	0.27%	physical
Morgan Stanley & Co. International plc	Equity Put Options		19/09/2025 At any time	208,800	0.20%	physical
Morgan Stanley & Co. International pic Equity Put Options			19/12/2025 At any time	64,900	0.06%	physical
Morgan Stanley & Co. International plc	Equity Put Options		19/06/2026 At any time	733,400	0.69%	physical
Morgan Stanley & Co. International plc	Equity Put Options		18/12/2026 At any time	676,800	0.64%	physical
Morgan Stanley & Co. International plc	Equity Swap		27/11/2025 At any time	120,848	0.11%	cash
Morgan Stanley & Co. LLC	Right of recall over securities lending agreements	At any time	At any time	451,053	0.43%	physical
	Morgan Stanley & Co. International plc Right of recall over securities lending agreements	At any time	At any time	111,501	0.11%	physical
Prime Dealer Services Corp.	Right of recall over securities lending agreements	At any time	At any time	462,381	0.44%	physical
Morgan Stanley & Co. International plc	Retail Structured Product - Note		02/07/2035 At any time	5,345	0.01%	cash
Morgan Stanley & Co. International plc	Retail Structured Product - Note		16/07/2035 At any time	14,392	0.01%	cash
Morgan Stanley & Co. International pic Retail Structured Product - Note			01/10/2035 At any time	2,358	0.00%	cash	+
3.16% TOTAL 3,350,978
	The totals will be updated once you have clicked on

TOTAL (A & B)		# of voting rights % of voting rights
	CALCULATE	3,361,310	3.17%

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

Peter Boelaert +32 479 30 91 59

Laetitia Van Minnenbruggen +32 484 65 30 47

[email protected]

Media relations Investor relations

Boris Cambon-Lalanne +32 471 55 37 49

Geoffroy d'Oultremont +32 478 88 32 96

Vincent Toussaint +33 6 74 87 85 65

[email protected]

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 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.

Ce communiqué de presse est également disponible en français. Dit persbericht is ook in het Nederlands beschikbaar.

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