Wärtsilä Corporation, flagging notification, 12 June 2025 at 16:00 EEST Notification in accordance with the Finnish Securities Market Act Chapter 9 § 10: BlackRock, Inc.'s holding in Wärtsilä Corporation BlackRock, Inc. has informed Wärtsilä Corporation that it has crossed below the 5% disclosure limit on total holding in shares and voting rights on 11 June 2025. Total position of BlackRock, Inc. and its funds subject to the notification: % of % of shares Total of Total number of shares shares and voting both in % and voting rights of and rights issuer voting through rights financial instruments Resulting Below Below 5% Below 5% 591,723,390 situation on the 5% date on which threshold was crossed or reached Position of 4.92% 0.28% 5.21% previous notification (if applicable) Notified details of the resulting situation on the date on which the threshold was crossed: A: Shares and voting rights Class / type Number % of of shares of shares shares and and voting voting rights rights Direct Indirect (SMA Direct Indirect (SMA 9:6 and 9:7) (SMA 9:6 and 9:7) (SMA 9:5) 9:5) FI0009003727 Below 5% Below 5% SUBTOTAL A Below 5% Below 5% B: Financial instruments according to SMA 9:6a Type of Expiration Exercise / Physical Number % of shares financial date Conversion or of and voting instrument Period cash shares rights settlement and voting rights American N/A N/A Physical Below 5% Below 5% Depositary Receipt (US9365441057) CFD N/A N/A Cash Below 5% Below 5% SUBTOTAL B Below 5% Below 5%