Solvay SA

Major Shareholding Notification • Sep 26, 2025

Final

	Name SOLVAY
Identification number 0403-091-220

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Part II

7) Date on which the threshold is crossed

22/09/2025 (DD/MM/YYYY)

3

105,876,416

Name Address (for legal entities)

Transparency notification Form TR-1 BE PART I

Please continue entering the information in part II concerning the persons referred to in Sections 5 and 6

Name	Address (for legal entities)
Morgan Stanley	c/o The Corporation Trust Company (DE), Corporation Trust Center, 1209 Orange Street, Wilmington, Delaware 19801, USA	+

1) Status of the notification

2) Issuer

3) Reason for the notification

5) Persons subject to the notification requirement

4) Notification by

6) Persons that dispose of voting rights (only to be filled in if art. 7 of the Law applies)

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
	TOTAL	0		0.00%

A parent undertaking or a controlling person

Acquisition or disposal of financial instruments that are treated as voting securities Downward crossing of the lowest threshold

10) Notified details

If the holding has fallen below the lowest threshold, you have the option of not entering any numbers in Section 10

9) Denominator

Please enter the denominator before filling in the data

Start with "groups" of holders. Add subtotals with S, and then finish with the persons who are "alone".

For groups, start with the ultimate controlling natural person or legal entity. The totals, subtotals and % will be updated once you have clicked on .

CALCULATE 0 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
							+
	TOTAL
	The totals will be updated once you have clicked on
	TOTAL (A & B)			# of voting rights	% of voting rights

	Done at Glasgow
On		26/09/2025 (DD/MM/YYYY)
	Name & capacity Alasdair Duff, Regulatory Operations	Signature

11) Full chain of controlled undertakings through which the holding is effectively held, if applicable

(DD/MM/YYYY) Holder will cease to hold / will hold again 0 voting rights as of

12) In case of proxy voting for only one GM

Please refer to Chain of Controlled Undertakings

13) Additional information

For security reasons, the unsigned form in xlsx format should be transmitted to trp.fin@fsma.be. You can do this manually OR if you have MS Outlook at your disposal via the "Save & Send" button.

In addition, a signed copy in PDF format should also be transmitted.

Chain of controlled undertakings

Chain of controlled undertakings for Morgan Stanley & Co. International plc

• Morgan Stanley & Co. International plc, 25 Cabot Square, Canary Wharf, London, E14 4QA, UNITED KINGDOM is a direct holder and is a subsidiary of Morgan Stanley Investments (UK)

• Morgan Stanley Investments (UK), 20 Bank Street, Canary Wharf, London, E14 4AD, UNITED KINGDOM is an indirect holder and is a subsidiary of Morgan Stanley International Limited

• Morgan Stanley International Limited, 25 Cabot Square, Canary Wharf, London, E14 4QA, UNITED KINGDOM is an indirect holder and is a subsidiary of Morgan Stanley International Holdings Inc.

• Morgan Stanley International Holdings Inc., c/o The Corporation Trust Company (DE), Corporation Trust Center, 1209 Orange Street, Wilmington, Delaware, 19801, USA. is an indirect holder and is a subsidiary of the beneficial owner, Morgan Stanley

Chain of controlled undertakings for Morgan Stanley & Co. LLC

• Morgan Stanley & Co. LLC, c/o The Corporation Trust Company (DE), Corporation Trust Center, 1209 Orange Street, Wilmington, Delaware, 19801, USA. is a direct holder and is a subsidiary of Morgan Stanley Capital Management, LLC.

• Morgan Stanley Capital Management, LLC, c/o The Corporation Trust Company (DE), Corporation Trust Center, 1209 Orange Street, Wilmington, Delaware, 19801, USA. is an indirect holder and is a subsidiary of the beneficial owner, Morgan Stanley

Chain of controlled undertakings for Prime Dealer Services Corp.

• Prime Dealer Services Corp., c/o The Corporation Trust Company (DE), Corporation Trust Center, 1209 Orange Street, Wilmington, Delaware, 19801, USA is a direct holder and is a subsidiary of Morgan Stanley & Co. LLC

• Morgan Stanley & Co. LLC, c/o The Corporation Trust Company (DE), Corporation Trust Center, 1209 Orange Street, Wilmington, Delaware, 19801, USA. is a direct holder and is a subsidiary of Morgan Stanley Capital Management, LLC.

• Morgan Stanley Capital Management, LLC, c/o The Corporation Trust Company (DE), Corporation Trust Center, 1209 Orange Street, Wilmington, Delaware, 19801, USA. is an indirect holder and is a subsidiary of the beneficial owner, Morgan Stanley

Morgan Stanley is not a controlled entity.