Participation notification by UBS Group AG

Group 1 - UBS Group AG has notified Solvay that it has crossed the threshold of 3% in voting rights, specifically a downward crossing [1] - The notification was dated September 24, 2024, and indicates that the threshold was crossed on September 18, 2024 [1] - The total number of voting rights for Solvay SA is 105,876,416, and UBS's indirect holdings fell below 3% due to a reduction in Trading Book holdings [1]