Solvay SA — Major Shareholding Notification 2025

Sep 26, 2025

Final

	Name SOLVAY
Identification number 0403-091-220

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18/09/2025 (DD/MM/YYYY)

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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.

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	0.00%	0.00%

The totals, subtotals and % will be updated once you have clicked on .

Name ^A + Part II 7) Date on which the threshold is crossed Please continue entering the information in part II concerning the persons referred to in Sections 5 and 6 Address (for legal entities)

10) Notified details

8) Threshold that is crossed (in %)

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

9) Denominator

Transparency notification Form TR-1 BE PART I

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 parent undertaking or a controlling person

Acquisition or disposal of financial instruments that are treated as voting securities

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 Retail Structured Product - Note			27/02/2026 At any time	5,100	0.00%	cash	-
Morgan Stanley & Co. International plc Retail Structured Product - Note			02/07/2035 At any time	6,313	0.01%	cash	-
Morgan Stanley & Co. International plc Retail Structured Product - Note			01/10/2035 At any time	1,982	0.00%	cash	-
Morgan Stanley & Co. International plc Retail Structured Product - Note			17/08/2037 At any time	4,544	0.00%	cash	-
Morgan Stanley & Co. International plc Retail Structured Product - Note			02/11/2037 At any time	12	0.00%	cash	-
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	316,100	0.30%	physical	-
Morgan Stanley & Co. International plc Equity Put Options			18/12/2026 At any time	425,100	0.40%	physical	-
Morgan Stanley & Co. International plc Equity Put Options			19/06/2026 At any time	756,300	0.71%	physical	-
Morgan Stanley & Co. International plc Equity Put Options			19/12/2025 At any time	142,900	0.13%	physical	-
Morgan Stanley & Co. International plc Equity Put Options			21/11/2025 At any time	133,400	0.13%	physical	-
Morgan Stanley & Co. International plc Equity Put Options			17/10/2025 At any time	134,800	0.13%	physical	-
Morgan Stanley & Co. International plc Equity Swap			27/11/2025 At any time	80,455	0.08%	cash	-
Morgan Stanley & Co. LLC	Right of recall over securities lending agreements	At any time	At any time	445,390	0.42%	physical	-
	Morgan Stanley & Co. International plc Right of recall over securities lending agreements	At any time	At any time	365,211	0.34%	physical	-
Prime Dealer Services Corp.	Right of recall over securities lending agreements	At any time	At any time	477,512	0.45%	physical	+
	TOTAL			3,310,019	3.13%

TOTAL (A & B)			# of voting rights % of voting rights
	CALCULATE	3,310,019	3.13%

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

12) In case of proxy voting for only one GM

The totals will be updated once you have clicked on

	Done at Glasgow
On		23/09/2025 (DD/MM/YYYY)
	Name & capacity Ross Williams, Regulatory Operations		Signature

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.