F-Secure Oyj

Major Shareholding Notification • May 5, 2008

Disclosure 258490

F-Secure Oyj - Company Announcement

ANNOUNCEMENT PURSUANT TO SECURITIES ACT CHAPTER 2, SECTION 10

F-Secure Corporation Stock Exchange Release 17.15 pm ANNOUNCEMENT PURSUANT TO SECURITIES ACT CHAPTER 2, SECTION 10 F-Secure Corporation has been informed today by Osuuspankkikeskus Osk (identity 0242522-1) that OPK's proportion of holding and voting rights is below one-twentieth (1/20). 1. The company: F-Secure Corporation 2. The date of change in holding: May 5, 2008 3. Exact proportion of voting rights and share capital in F-Secure Corporation: Totally 6,258,511 shares; 4.03% of voting rights and share capital. 4. Shareholder: OP-Rahastoyhtiön hallinnoimat rahastot, Y-tunnus 0743962-2 Shareholders and their share of voting rights and of share capital. Shares of capital of votes Pohjola Vakuutus Oy, 1458359-3 200.000 0,129 % 0,129 % A-Vakuutus Oy, 1715947-2 25.000 0,016 % 0,016 % OP-Delta, 1102395-3 2.494.930 1,608 % 1,608 % OP-Focus , 1753298-6 1.244.424 0,802 % 0,802 % OP-Pohjola Pienyhtiöt, 1960678-2 400.000 0,258 % 0,258 % OP-Suomi Pienyhtiöt 1753300-6 1.894.157 1,221 % 1,221 % Total 6.258.511 4,034 % 4,034 % F-Secure Corporation Kimmo Alkio President & CEO Additional information: F-Secure Corporation Taneli Virtanen, CFO tel.358 9 2520 5655 DISTRIBUTION Helsinki Exchanges