159 Likes Transparency notification Wellington Brussels (Belgium), 17 May 2024 – 20:05 (CEST) – Regulated information 1. Summary of the notification Pursuant to Article 14 of the law of 2 May 2007 on the disclosure of large shareholdings, UCB SA/NV announces that it has received a transparency notification from Wellington Management Group LLP (having its registered offices at 280 Congress Street, Boston, MA 02210, USA) on 15 May 2024. Wellington Management Group LLP has notified that, following a disposal of UCB shares with voting rights by its affiliates, its shareholding in UCB SA/NV has decreased and it has crossed the 5% threshold downwards, on 14 May 2024. On 14 May 2024, Wellington Management Group LLP (taking into account the holding of its affiliates) owned 9 705 989 UCB shares with voting rights and 1 584 equivalent financial instruments, representing 4.99% of the total number of shares issued by the company (194 505 658), versus 7.48% (14 548 260 UCB shares) in the previous notification dated 20 November 2023. 2. Content of the notification 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. Notification by: A parent undertaking or a controlling person. Persons subject to the notification requirement: Date on which the threshold is crossed: 14 May 2024. Threshold crossed (in %): 5%. Denominator: 194 505 658. Notified details: Chain of controlled undertakings through which the holding is effectively held: Additional information: Wellington Management Company LLP and Wellington Management International Ltd are investment management companies and can exercise the voting rights at their discretion in the absence of specific instructions from the beneficial owners of the shares. 3. Further information This press release and the detailed transparency notification are available on UCB SA/NV’s website via the following link. An updated overview of the UCB SA/NV large shareholdings will be 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 8 600 people in nearly 40 countries, the company generated revenue of € 5.8 billion in 2021. UCB is listed on Euronext Brussels (symbol: UCB). Follow us on Twitter: @UCB_news Asset Download 140524 - CdP Notification de transparence Wellington - FINAL 140524 - PB Transparantieverklaring Wellington - FINAL 140524 - PR Transparency notification Wellington - FINAL 159 Likes