Solvay SA — Major Shareholding Notification 2025

Nov 12, 2025

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Transparency notification Form TR-1 BE PART I

1) Status of the notification
	[ ·	1
	Final
2) Issuer
	SOLVAY
Identification number	0403-091-220
3) Reason for the notification	1
	Acquisition or disposal of voting securities or voting rig	hts	+
4) Notification by
	A parent undertaking or a controlling person		+
5) D
5) Persons subject to the not	tification requirement
	Name	Address (for legal entities)
		c/o The Corporation Trust Company (DE), Corporation Trust Center, 1209 Orange Street, Wilmington, Delaware 19801, USA	+
6) Persons that dispose of vo	oting rights (only to be filled in if art. 7 of the Lav	w applies)
	Name	Address (for legal entities)
			+
	Please continue entering the information in part II c persons referred to in Sections 5 and 6	concerning the Part II
7) Date on which the thresho	old is crossed
	03/11/2025	(DD/MM/YYYY)
8) Threshold that is crossed	(in %)
	3
•	If the holding has fallen below the lowest threshold,	, you have the option of not entering any numbers in Section 10
9) Denominator

10) 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		32,005	0	0.03%	0.00%
Morgan Stanley & Co. International plc		339,917	0	0.32%	0.00%
Subtotal		371,922		0.35%
TOTAL		371,922	0	0.35%	0.00%

105,876,416

Please enter the denominator before filling in the data

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Start with "groups" of holders. Add subtotals with Σ, 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 .

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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	6,087	0.01%	cash	-
Morgan Stanley & Co. International plc	Retail Structured Product - Note	02/07/2035	At any time	6,045	0.01%	cash	-
Morgan Stanley & Co. International plc	Retail Structured Product - Note	01/10/2035	At any time	10,702	0.01%	cash	-
Morgan Stanley & Co. International plc	Retail Structured Product - Note	17/08/2037	At any time	4,773	0.00%	cash	-
Morgan Stanley & Co. International plc	Retail Structured Product - Note	02/11/2037	At any time	28,640	0.03%	cash	-
Morgan Stanley & Co. International plc	Equity Call Options	19/12/2025	At any time	800	0.00%	physical	-
Morgan Stanley & Co. International plc	Equity Call Options	19/06/2026	At any time	637,200	0.60%	physical	-
Morgan Stanley & Co. International plc	Equity Call Options	01/10/2035	At any time	67	0.00%	cash	-
Morgan Stanley & Co. International plc	Equity Call Options	02/11/2037	At any time	1,402	0.00%	cash	-
Morgan Stanley & Co. International plc	Equity Put Options	19/06/2026	At any time	741,100	0.70%	physical	-
Morgan Stanley & Co. LLC	Right of recall over securities lending agreements	At any time	At any time	709,003	0.67%	physical	-
Morgan Stanley & Co. International plc	Right of recall over securities lending agreements	At any time	At any time	301,562	0.28%	physical	-
Prime Dealer Services Corp.	Right of recall over securities lending agreements	At any time	At any time	453,934	0.43%	physical	+
	TOTAL			2,901,315	2.74%

The totals will be updated once you have clicked on

TOTAL (A & B)	# of voting rights	% of voting rights
	CALCULATE	3,273,237	3.09%

11	l) Ful	ll chain o	f controllec	l undertakings	through	ı which th	ne holding	is effectively	/ held	, if applicable
	•

	Please refer to Chain of Controlled Undertakings
12) In case of proxy voting for	or only one GM
				(DD/MM/YYYY)
Holder		will cease to hold / 0	voting rights as of
		will hold again
13) Additional information
10// taditional information

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	Done at Glasgow
On		07/11/2025 (DD/MM/YYYY)
	Name & capacity Nga Macrow, 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.

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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.