Wärtsilä Oyj Abp

Major Shareholding Notification • May 2, 2025

Disclosure 458417

Wärtsilä - Major shareholder announcements

Notification in accordance with the Finnish Securities Market Act Chapter 9 § 10: BlackRock, Inc.'s holding in Wärtsilä Corporation

Wärtsilä Corporation, flagging notification, 2 May 2025 at 8:30 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 above the 5% disclosure limit on holding in shares and voting rights, excluding financial instruments according to SMA 9:6a, on 30 April 2025. Following the transaction, BlackRock, Inc. owns 5.09% of Wärtsilä's shares and voting rights, while its total holding in Wärtsilä Corporation corresponds to 5.44%. 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 5.09% 0.35% 5.44% 591,723,390 situation on the date on which threshold was crossed or reached Position of 4.98% 0.37% 5.36% previous notification (if applicable) Notified details of the resulting situation on the date on which the threshold was crossed or reached: 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 30,120,874 5.09% SUBTOTAL A 30,120,874 5.09% 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 2,085,895 0.35% SUBTOTAL B 2,085,936 0.35%