Participation notification by Citigroup Inc.

Press release Regulated information Brussels, October 1, 2026, 17:45 CEST In line with Belgian transparency legislation (Law of May 2, 2007), Citigroup Inc. recently sent to Solvay the following transparency notification indicating that it crossed the threshold of 3%. Here is a summary of the notification: Date on which the threshold is crossedVoting rights after the transactionEquivalent financial instruments after the transactionTotalSeptember 24, 20260.43%2.66%3.09% The notification, dated Se