Solvay SA

Major Shareholding Notification • Feb 21, 2024

FSMA

2) Issuer

Name SOLVAY Identification number 0403-091-220

1) Status of the notification

Final

3) Reason for the notification

Acquisition or disposal of voting securities or voting rights

4) Notification by

A parent undertaking or a controlling person

5) Persons subject to the notification requirement

Name	Address (for legal entities)
David Einhorn	140 East 45th Street, 24th Floor, New York, NY 10023, USA
DME Advisors GP, Lie	Corporation Trust Center, 1209 Orange Street, Wilmington, DE 19801 USA
DME Capital Management, LP	Corporation Trust 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)

O Please continue entering the information in part II concerning the n .. persons referred to in Sections ⁵ and ^{6 i} di l II

7) Date on which the threshold is crossed

^I 12/02/2024¹ (DD/MM/YYYY)

8) Threshold that is crossed (in %)

T al

If the holding has fallen below the lowest threshold, you have the option of not entering any numbers in Section 10

9) Denominator

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
David Einhorn	0	0		0,00%
DME Advisors, LP	132,170	132,170		0.12%
DME Capital Management, LP	3,052,430	3,175,960		3.00%

Subtotal	3,184,600	3,308,130		3.12%
	TOTAL	3,308,130	0	3.12%	0.00%

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

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
							-P
	TOTAL			0	0.00%

The totals will be updated once you have clicked on

TOTAL (A & B)			# of voting rights % of voting rights
	CALCULATE i	3,308,130	3.12%

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

12) In case of proxy voting for only one GM

					(DD/MM/YYYY)
Holder		will cease to hold / will hold again		voting rights as of
Additional information 13)
	DME Advisors, LP and DME Capital Management, LP are the discretionary investment managers and exercise the voting rights at their discretioin in the absence of specific instructions. Please note that the percentage of 3 percent In section 10 of the notification displayed for DME Capital Management is due to rounding.
	Done at Brussels
On	19/02/2024	(DD/MM/YYYY)
	Name & capacity Jeroen Smets, mandatee		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.