Wärtsilä Corporation, flagging notification, 11 April 2025 at 16:30 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 holding in shares and voting rights, excluding financial instruments according to SMA 9:6a, on 10 April 2025. Following the transaction, BlackRock, Inc. owns 4.87% of Wärtsilä's shares and voting rights, while its total holding in Wärtsilä Corporation corresponds to 5.28%. 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 4.87% 0.41% 5.28% 591,723,390 situation on the date on which threshold was crossed or reached Position of 5.01% 0.41% 5.43% 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 of shares shares and shares voting and rights voting rights Direct Indirect (SMA Direct Indirect (SMA 9:6 and 9:7) (SMA 9:5) 9:6 and 9:7) (SMA 9:5) FI0009003727 28,838,321 4.87% SUBTOTAL A 28,838,321 4.87% B: Financial instruments according to SMA 9:6a Type of Expiration Exercise / Physical Number of % of shares financial date Conversion or shares and voting instrument Period cash and rights settlement voting rights American N/A N/A Physical 41 0,00% Depositary Receipt (US9365441057) CFD N/A N/A Cash 2,457,546 0.41% SUBTOTAL B 2,457,587 0.41%