Solvay SA

Major Shareholding Notification • Oct 27, 2025

Transparency notification Form TR-1 BE PART I

1) Status of the notification
	Final
2) Issuer
Name Identification number	SOLVAY 0403-091-220
3) Reason for the notification	1
	Acquisition or disposal of financial instruments that are Downward crossing of the lowest threshold	treated as voting securities	+
4) Notification by
	A parent undertaking or a controlling person		+
5) Persons subject to the no	tification requirement
	Name	Address (for legal entities)
	Morgan Stanley	c/o The Corporation Trust Company (DE), Corporation Trust Center, 1209 Orange Street, Wilmington, Delaware 19801, USA	+
6) Persons that dispose of ve	oting rights (only to be filled in if art. 7 of the Lav	v applies)
	Name	Address (for legal entities)
			+
•	Please continue entering the information in part II copersons referred to in Sections 5 and 6	oncerning the Part II
7) Date on which the thresho	old is crossed
	16/10/2025	(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
	105,876,416

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
Morgan Stanley & Co. International plc	34,972
Subtotal	34,972
TOTAL

Start with "groups" of holders. Add subtotals with $\Sigma$ , 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.

-+

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 or	n
	TOTAL (A & B)			# of voting rights	% of voting rights
			CALCULATE
11) Full chain of controlled u	ndertakings through which the holding i	s effectively he	ld if applicable
11) I dil cham di controlled d	ndertakings through which the holding i	3 ellectively fie	іч , іі арріісаріе
	Disease refer to Chair of Controlled Undertakings
	Please refer to Chain of Controlled Undertakings
12) In case of provivoting fo	or only one CM
12) In case of proxy voting for	or only one Givi					(DD/MM/YYYY)
Holder		will cease to hold /			voting rights as of	(DD/MIM/TTTT)
		will hold again					İ
13) Additional information
Done at	Glasgow
		1
On	22/10/2025	(DD/MM/YYYY)
Name & capacity	Alasdair Duff, Regulatory Operations		0!	A Dull.
		I	Signature	700			i

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 $\underline{\mathsf{PDF}}$ 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.