Participation Notification by Blackrock Inc.

Brussels, 29 April 2021, 17:45 CEST - According to Belgian transparency legislation (Law of May 2, 2007), BlackRock Inc. (55 East 52nd Street, New York, NY, 10055, U.S.A.) recently sent to Solvay the following transparency notifications indicating that it crossed the threshold of 3%. Here is a summary of the moves:

Date on which the threshold was crossed	Voting rights after the transaction	Equivalent financial instruments after the transaction	Total
April 22, 2021	3.00%	0.16%	3.16%
April 23, 2021	2.98%	0.16%	3.14%
April 26, 2021	3.06%	0.16%	3.22%

The latest notification, dated April 27, 2021, contains the following information:

• Reason for the notification: acquisition or disposal of voting securities or voting rights

• Notified by: BlackRock Inc. (55 East 52nd Street, New York, NY, 10055, U.S.A.)

• Date on which the threshold is crossed: April 26, 2021

• Threshold of direct voting rights crossed: 3% upwards

• Denominator: 105,876,416

• Additional information: The disclosure obligation arose due to voting rights attached to shares for BlackRock, Inc. going above 3%.

Transparency notifications are available on the Investor Relations Section of Solvay's website.

Attachments

• Solvay_2021-04-26_Issuer_signed

• Solvay_2021-04-23_Issuer_signed

• Solvay_2021-04-22_Issuer_signed

• 20210429_transparency declaration Blackrock-EN