F-Secure Corporation
April 16, 2010 at 10.30

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 fallen below 5 % (1/20) and is currently 4.58%.

1. The company: F-Secure Corporation

2. The date of change in holding: April 15, 2010

3. Exact proportion of voting rights and share capital in F-Secure Corporation:
Totally 7,217,167 shares; 4.58% of voting rights and share capital.

4. Shareholder: Ilmarinen Mutual Pension Insurance Company

F-Secure Oyj
Taneli Virtanen
CFO

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