F-Secure Oyj

Transaction in Own Shares • May 31, 2011

Disclosure 287493

F-Secure Oyj - Company Announcement

F-Secure to continue buy-back of own shares

F-Secure Corporation May 31, 2011 at 3.00 p.m. F-Secure to continue buy-back of own shares F-Secure's Board of Directors has decided to continue repurchase of its own shares based on the authorization of the Annual General Meeting of March 30, 2011. The maximum number of shares to be repurchased is 2.000.000 shares, representing maximum of approximately 1.3% of all shares issued by the Company. F-Secure currently holds 3.307.313 own shares, corresponding to 2.1% of the company's shares. The shares are purchased through public trading on the NASDAQ OMX Helsinki Ltd. in accordance with its rules and at market price. The own shares will be purchased to improve the Company's financial structure, to be used as part of the incentive compensation plan, or to be used for the purpose for making acquisitions or implementing other arrangements related to the Company's business, or otherwise assigning or cancelling the shares. The repurchase of own shares will commence on June 8, at the earliest. F-Secure Corporation Taneli Virtanen CFO For further information, please contact: Taneli Virtanen, CFO, tel. +358 9 2520 5655 Mervi Pohjoisaho, IR, tel. +358 40 535 8989