Solvay SA — Major Shareholding Notification 2026

Mar 18, 2026

FSMA

FINANCIAL SERVICES AND

MARKETS AUTHORITY

Transparency notification

Form TR-1 BE

PART I

1) Status of the notification

Final

2) Issuer

Name
SOLVAY
Identification number
0403-091-220

3) Reason for the notification

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

4) Notification by

A parent undertaking or a controlling person

5) Persons subject to the notification requirement

Name	Address (for legal entities)
The Goldman Sachs Group, Inc	Corporation Truse Center, 1209 Orange Street, Wilmington, DE 19801, USA

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

Name	Address (for legal entities)

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

Part II

7) Date on which the threshold is crossed

09/03/2026 (DD/MM/YYYY)

8) Threshold that is crossed (in %)

7.5

↑ 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

↑ Please enter the denominator before filling in the data

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
The Goldman Sachs Group, Inc.	0	0		0.00%
Goldman Sachs International	22,743	0		0.00%
Goldman Sachs Asset Management, L.P.	116,571	116,571		0.11%
Goldman Sachs Asset Management International	19,811	19,811		0.02%
Goldman Sachs Bank Europe SE	12,346	14,631		0.01%
Goldman Sachs & Co. LLC		4		0.00%

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TOTAL

	151,017	0	0.14%	0.00%

Start with "groups" of holders. Add subtotals with $\sum_{i=1}^{n} x_i$ 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
Goldman Sachs Bank Europe SE	Call Warrant	31/12/2030		139	0.00%	cash
Goldman Sachs Bank Europe SE	Call Warrant	31/12/2030		828	0.00%	cash
Goldman Sachs Bank Europe SE	Call Warrant	31/12/2030		800	0.00%	cash
Goldman Sachs Bank Europe SE	Call Warrant	31/12/2030		3,200	0.00%	cash
Goldman Sachs Bank Europe SE	Call Warrant	31/12/2030		2,400	0.00%	cash
Goldman Sachs Bank Europe SE	Call Warrant	31/12/2030		1,700	0.00%	cash
Goldman Sachs Bank Europe SE	Call Warrant	30/06/2037		4,550,000	4.30%	cash
Goldman Sachs Bank Europe SE	Call Warrant	31/12/2030		100	0.00%	cash
Goldman Sachs Bank Europe SE	Call Warrant	31/12/2030		10,000	0.01%	cash
Goldman Sachs Bank Europe SE	Call Warrant	31/12/2030		90	0.00%	cash
Goldman Sachs Bank Europe SE	Call Warrant	31/12/2030		1,000	0.00%	cash
Goldman Sachs Bank Europe SE	Call Warrant	31/12/2030		2,283	0.00%	cash
Goldman Sachs Bank Europe SE	Call Warrant	31/12/2030		6,000	0.01%	cash
Goldman Sachs Bank Europe SE	Call Warrant	31/12/2030		400	0.00%	cash
Goldman Sachs Bank Europe SE	Call Warrant	31/12/2030		7,222	0.01%	cash
Goldman Sachs Bank Europe SE	Call Warrant	31/12/2030		5,800	0.01%	cash
Goldman Sachs International	Swap	13/11/2034		6,837	0.01%	cash
Goldman Sachs International	Swap	11/11/2027		13,241	0.01%	cash
Goldman Sachs International	Swap	25/02/2028		2,409	0.00%	cash
Goldman Sachs International	Swap	22/05/2035		109,601	0.10%	cash
Goldman Sachs International	Swap	06/06/2035		17,172	0.02%	cash
Goldman Sachs International	Swap	05/09/2028		22,774	0.02%	cash
Goldman Sachs International	Swap	30/10/2035		68,366	0.06%	cash
Goldman Sachs International	Swap	31/10/2035		263	0.00%	cash
Goldman Sachs International	Swap	06/11/2035		15,045	0.01%	cash
Goldman Sachs International	Swap	26/11/2035		316	0.00%	cash
Goldman Sachs International	Swap	26/11/2035		583,131	0.55%	cash
Goldman Sachs International	Swap	26/11/2035		251,639	0.24%	cash
Goldman Sachs International	Swap	28/12/2026		212,022	0.20%	cash
Goldman Sachs International	Swap	17/08/2026		4,784	0.00%	cash
Goldman Sachs International	Swap	11/01/2027		26,248	0.02%	cash
Goldman Sachs International	Swap	02/01/2029		527	0.00%	cash
Goldman Sachs International	Swap	05/12/2030		9,741	0.01%	cash
Goldman Sachs International	Swap	05/01/2027		340	0.00%	cash
Goldman Sachs International	Swap	14/01/2036		3,044	0.00%	cash
Goldman Sachs International	Swap	14/01/2036		12,973	0.01%	cash
Goldman Sachs International	Swap	16/01/2031		1,052	0.00%	cash
Goldman Sachs International	Swap	16/01/2029		32,853	0.03%	cash
Goldman Sachs International	Swap	21/01/2036		394,714	0.37%	cash
Goldman Sachs International	Swap	26/02/2027		223,337	0.21%	cash
Goldman Sachs International	Swap	05/02/2029		430	0.00%	cash
Goldman Sachs International	Swap	05/02/2029		221	0.00%	cash
Goldman Sachs International	Swap	18/02/2036		689	0.00%	cash
Goldman Sachs International	Swap	18/02/2036		4,414	0.00%	cash
Goldman Sachs International	Swap	18/02/2036		13,366	0.01%	cash

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Goldman Sachs International	Swap	26/02/2029		233,584	0.22%	cash	-
Goldman Sachs International	Swap	25/03/2027		74,957	0.07%	cash	-
Goldman Sachs International	Swap	26/02/2029		4,032	0.00%	cash	-
Goldman Sachs International	Swap	04/03/2036		1,791	0.00%	cash	-
Goldman Sachs International	Swap	05/03/2029		4,861	0.00%	cash	-
Goldman Sachs International	Swap	17/08/2026		613	0.00%	cash	-
Goldman Sachs International	Swap	17/08/2026		121	0.00%	cash	-
Goldman Sachs International	Swap	16/04/2026		1	0.00%	cash	-
Goldman Sachs International	Put Option	18/12/2026		75,000	0.07%	Physical	-
Goldman Sachs International	Call Option	19/06/2026		175,000	0.17%	Physical	-
Goldman Sachs International	Put Option	18/06/2027		150,000	0.14%	Physical	-
Goldman Sachs International	Securities Lending	Open		129,219	0.12%	Physical	-
Goldman Sachs Bank Europe SE	Securities Lending	Open		5,769	0.01%	Physical	-
Goldman Sachs & Co. LLC	Securities Lending	Open		18,633	0.02%	Physical	+
TOTAL				7,497,090	7.08%

1. The totals will be updated once you have clicked on

TOTAL (A & B)

	# of voting rights	% of voting rights
CALCULATE	7,648,107	7.22%

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

Please refer to Annexure - Structured Chart

12) In case of proxy voting for only one GM

Holder

will cease to hold / will hold again

0

voting rights as of

(00/MM/YYYY)

13) Additional information

With reference to the items mentioned in Section 10B:
"Call Warrants", "Swaps", "Call Option" and "Put Option" mentioned in rows 65 to 120- these are held by the corresponding entities where Goldman Sachs has a long exposure

Done at London

On 13/03/2026 (DD/MM/YYYY)

Name & capacity Dluwatobi Amusan, Executive Director

Signature

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For security reasons, the unsigned form in xlsx format should be transmitted to trp.fm@foma.hp. 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:

• GOLDMAN SACHS INTERNATIONAL IS CONTROLLED BY GOLDMAN SACHS GROUP UK LIMITED WHICH IS CONTROLLED BY GOLDMAN SACHS (UK) L.L.C. WHICH IS CONTROLLED BY THE GOLDMAN SACHS GROUP, INC.
• GOLDMAN SACHS ASSET MANAGEMENT, L.P. IS CONTROLLED BY GSAM HOLDINGS LLC WHICH IS CONTROLLED BY THE GOLDMAN SACHS GROUP, INC.
• GOLDMAN SACHS ASSET MANAGEMENT INTERNATIONAL IS CONTROLLED BY GOLDMAN SACHS ASSET MANAGEMENT INTERNATIONAL HOLDINGS LTD WHICH IS CONTROLLED BY GSAMI HOLDINGS II LTD. WHICH IS CONTROLLED BY GSAMI HOLDINGS I LLC WHICH IS CONTROLLED BY GSAM HOLDINGS LLC WHICH IS CONTROLLED BY THE GOLDMAN SACHS GROUP, INC.
• GOLDMAN SACHS BANK EUROPE SE IS CONTROLLED BY GOLDMAN SACHS BANK USA WHICH IS CONTROLLED BY THE GOLDMAN SACHS GROUP, INC.
• GOLDMAN SACHS & CO. LLC IS CONTROLLED BY THE GOLDMAN SACHS GROUP, INC.