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