June 11, 2010 at 14.00

Announcement pursuant to Securities Act Chapter 2, Section 10 

F-Secure Corporation has today been informed by Ilmarinen Mutual Pension
Insurance Company (register number 0107638-1) that the holding of Ilmarinen in
F-Secure has exceeded 5 % (1/20) and is currently 5.59%. 

1. The company: F-Secure Corporation

2. The date of change in holding: June 11, 2010 

3. Exact proportion of voting rights and share capital in F-Secure Corporation: 
Totally 8,809,207 shares; 5.59% of voting rights and share capital.

4. Shareholder: Ilmarinen Mutual Pension Insurance Company

F-Secure Oyj
Kimmo Alkio
CEO

For more information, please contact:
F-Secure Corporation
Mervi Pohjoisaho, IR, tel. +358 40 535 8989