Solvay SA — Major Shareholding Notification 2026

May 13, 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 voting securities or voting rights
- -
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)
SIH Partners, LLLP	One Commerce Center 1201 N Orange Street Suite 715, Wilmington, Delaware, United States of America

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

08/05/2026 (DD/MM/YYYY)

8) Threshold that is crossed (in %)

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
SIH Partners, LLLP		0		0.00%
Susquehanna International Group Limited		44,851		0.04%
Susquehanna International Securities Limited		77,373		0.07%
Subtotal		122,224		0.12%
TOTAL		122,224	0	0.12%	0.00%

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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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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
Susquehanna International Securities Limited	Call Option	15/05/2026	Anytime	41,800	0.04%	physical
Susquehanna International Securities Limited	Call Option	19/06/2026	Anytime	725,600	0.69%	physical
Susquehanna International Securities Limited	Call Option	17/07/2026	Anytime	3,300	0.00%	physical
Susquehanna International Securities Limited	Call Option	18/09/2026	Anytime	156,000	0.15%	physical
Susquehanna International Securities Limited	Call Option	18/12/2026	Anytime	1,108,400	1.05%	physical
Susquehanna International Securities Limited	Call Option	19/03/2027	Anytime	1,500	0.00%	physical
Susquehanna International Securities Limited	Call Option	18/06/2027	Anytime	175,000	0.17%	physical
Susquehanna International Securities Limited	Put Option	15/05/2026	Anytime	700	0.00%	physical
Susquehanna International Securities Limited	Put Option	19/06/2026	Anytime	300	0.00%	physical
Susquehanna International Securities Limited	Put Option	18/12/2026	Anytime	450,000	0.43%	physical
Susquehanna International Securities Limited	Put Option	19/03/2027	Anytime	100	0.00%	physical
Susquehanna International Securities Limited	Put Option	18/06/2027	Anytime	350,000	0.33%	physical
Susquehanna International Securities Limited	Put Option	17/12/2027	Anytime	2,250,000	2.13%	physical
TOTAL				5,262,700	4.97%

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

The totals will be updated once you have clicked on
| TOTAL (A & B) | # of voting rights | % of voting rights |
| --- | --- | --- |
| CALCULATE | 5,384,924 | 5.09% |

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

SIH Partners, LLLP -> Susquehanna International Holdings, LLC -> Susquehanna Europe Holdings Limited -> Susquehanna International Group Limited
SIH Partners, LLLP -> Susquehanna International Holdings, LLC -> Susquehanna Dublin Holdings Limited -> Susquehanna International Securities Limited

12) In case of proxy voting for only one GM

Holder

will cease to hold / will hold again

0

voting rights as of

(DO/MM/YYYY)

13) Additional information

Done at

Susquehanna International Group Limited

On

11/05/2026

(DO/MM/YYYY)

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Michael Early, Risk Analyst

Signature

Michael Early

For security reasons, the unsigned form in xlsx format should be transmitted to tra.fm@fuma.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.