Solvay SA — Major Shareholding Notification 2026

Jan 29, 2026

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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

Downward crossing of the lowest threshold

³ - ¹³ +

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

21-01-2026 (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
UBS AG	0
UBS Europe SE	67.991
UBS Asset Management (Singapore) Ltd	732
UBS Asset Management (Europe) S.A.	34.968
UBS Fund Management (Switzerland) AG	80.334

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Subtotal 184.025 ^S + TOTAL 0 0 0,00% 0,00%

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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) Equivalent financial instruments		After the	he 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			0	0,00%
•	The totals will be updated once you have clicked o	on	·
	TOTAL (A & B)			# of voting rights	% of voting rights
			CALCULATE	0	0,00%
	Please see full chain of control attached.
2) In case of proxy voting fo		will cease to hold /	0		voting rights as of	(DD/MM/YYYY)
		will hold again
3) Additional information
ne disclosure obligation arose due to t	he total indirect holdings of UBS Group AG in voting rig	hts of Solvay SA heli	d directly by controlled	undertakings falling	below 3% on January	/ 21 2026
Done at	Zurich, Switzerland
On	23-01-2026	(DD/MM/YYYY)
Name & capacity	Additionized Officer		Signature	54
	Konstantina Georgaki Director		Signature	- Georgalu P

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.

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11. Information in relation to the person subject to the notification obligation – organizational chart
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 Asset Management AG
UBS Asset Management Switzerland AG
UBS Fund Management (Switzerland) AG
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UBS Group AG
UBS AG
UBS Europe SE