Solvay SA — Major Shareholding Notification 2025

Dec 15, 2025

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Transparency notification Form TR-1 BE PART I

			1) Status of the notification
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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

³ +

4) Notification by

A parent undertaking or a controlling person

² +

^A +

5) Persons subject to the notification requirement

Name	Address (for legal entities)
UBS Group AG	Bahnhofstrasse 45, 8001 Zürich	+

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

05.12.2025 (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

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
UBS Group AG	0	0		0.00%
UBS AG	61,558	0		0.00%
UBS Europe SE	2,352	67,991		0.06%
UBS Asset Management (Singapore) Ltd	732	732		0.00%
UBS Asset Management (Europe) S.A.	34,968	34,968		0.03%
UBS Fund Management (Switzerland) AG	80,334	80,334		0.08%

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Subtotal 179,944 184,025 0.17% ^S + TOTAL 184,025 0 0.17% 0.00%

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

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.

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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
UBS AG	Long Call Option	19.06.2026		135,000	0.13%	physical
UBS AG	Short Put Option	19.06.2026		395,000	0.37%	physical
UBS AG	Equity Swaps	28.03.2028		898	0.00%	cash
UBS AG	Right to Recall of Lent shares		At any time	436,067	0.41%	physical
UBS Switzerland AG	Right to Recall of Lent shares		At any time	22,743	0.02%	physical
UBS Switzerland AG	Right to Substitute shares delivered as collaterals		At any time	135,979	0.13%	physical
UBS Switzerland AG	Right of use over shares		At any time	1,404	0.00%	physical
UBS Securities LLC	Right of use over shares		At any time	6,932	0.01%	physical
UBS Switzerland AG	Right of use over Reverse Convertible		At any time	9,195	0.01%	cash
UBS AG	Swaps on Baskets	30.06.2026		80	0.00%	cash
UBS AG	Swaps on Baskets	01.06.2027		1,955,121	1.85%	cash
UBS AG	Short Put Option	18.12.2026		285,000	0.27%	physical	4
	TOTAL	•	•	3,383,419	3.20%
•	The totals will be updated once you have clicked	on
	TOTAL (A & B)			# of voting rights	% of voting rights
			CALCULATE	3,567,444	3.37%

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

	Please see full chain of control attached.
12) In case of proxy voting for	or only one GM
Holder		will cease to hold / will hold again	0	voting rights as of	(DD/MM/YYYY)

13) Additional information

Done at	Zurich, Switzerland
		· !
On	10.12.2025	(DD/MM/YYYY

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Name & capacity Ewa Zajac Associate Director Signature Sjoerd Sluimer Authorized Officer Signature

Signature	Ewa	zojąc
Signature	Ş	WZ

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11. Information in relation to the person subject to the notification obligation – organizational
UBS Group AG
UBS AG
UBS Asset Management AG
UBS Asset Management (Europe) S.A.
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UBS Group AG
UBS AG
UBS Asset Management AG
UBS Asset Management (Singapore) Ltd
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UBS Group AG
UBS AG
UBS Europe SE
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UBS Group AG
UBS AG
UBS Asset Management AG
UBS Asset Management Switzerland AG
UBS Fund Management (Switzerland) AG
-
UBS Group AG
UBS AG
UBS Americas Holding LLC
UBS Americas Inc.
UBS Securities LLC
-
UBS Group AG
UBS AG
UBS Switzerland AG