260 Likes Acquisition of own shares Brussels (Belgium), 24 March 2023 – 20:00 (CET) – Regulated information Acquisition of own shares In accordance with article 8:4 of the Royal Decree of 29 April 2019 executing the Belgian Code on Companies and Associations, UCB SA/NV (“UCB” or the “Company) (Euronext Brussels: UCB) hereby discloses certain information in relation to its Share Repurchase Program 2023. Under this program, UCB has requested a financial intermediary to repurchase up to 500 000 UCB shares on its behalf under the terms of a discretionary mandate agreement with initial validity until 28 April 2023, effective as from 27 February 2023, to cover current and future obligations under UCB's Long Term Incentive Plans for its personnel. In the framework of this Share Repurchase Program 2023, UCB repurchased 57.644 UCB shares on Euronext Brussels on 17 March 2023, as follows: As a result thereof, the Share Repurchase Program 2023 has been completed. This press release is available on UCB SA/NV’s website via the following link. For further information, contact UCB: Investor Relations Antje Witte T +32 2 559 94 14 antje.witte@ucb.com Corporate Communications Laurent Schots T+32 2 559 92 64 laurent.schots@ucb.com About UCB UCB, Brussels, Belgium (www.ucb.com) is a global biopharmaceutical company focused on the discovery and development of innovative medicines and solutions to transform the lives of people living with severe diseases of the immune system or of the central nervous system. With approximately 8 700 people in 36 countries, the company generated revenue of € 5.5 billion in 2022. UCB is listed on Euronext Brussels (symbol: UCB). Follow us on Twitter: @UCB_news Asset Download 8bd7946cce31cb85.docx a023a533cddde65e.docx a18cc6046a99738d.docx 260 Likes