Announcement pursuant to Securities Act Chapter 2, Section 10

Apr 4, 2008

F-Secure Corporation has been informed today by Osuuspankkikeskus Osk (identity 0242522-1) that OPK’s holding and voting rights will go over one-twentieth (1/20).

1. The company: F-Secure Corporation

2. The date of change in holding: April 4, 2008

3. Exact proportion of voting rights and share capital in F-Secure Corporation:

Totally 7,934,274 shares; 5.12% of voting rights and share capital

4. Shareholder:

Shareholders and their share of voting rights and of share capital.
 
      
OP-Rahastoyhtiön hallinnoimat rahastot,
Y-tunnus 0743962-2
    
Pohjola Vakuutus Oy, 1458359-3  
225.000 shares,  0,145 %  of capital, 0,145 % of votes

A-Vakuutus Oy, 1715947-2  
25.000 shares,  0,016 % of capital, 0,016 % of votes

OP-Delta, 1102395-3        
2.994.930 shares,  1,931 % of capital, 1,931 % of votes

OP-Teknologia , 1601124-9
50.763  shares, 0,033 % of capital,  0,033 % of votes

OP-Focus , 1753298-6       
1.244.424 shares, 0,802 % of capital, 0,802 % of votes

OP-Pohjola Pienyhtiöt, 1960678-2       
650.000  shares, 0,419 %  of capital, 0,419 % of votes

OP-Suomi Pienyhtiöt  1753300-6      
2.744.157 shares, 1,769 %  of capital, 1,769 % of votes


TOTALLY  7.934.274  shares ,  5,115 %  of capital,  5,115 % of votes



F-Secure Corporation

Kimmo Alkio
President & CEO

Additional information:
F-Secure Corporation
Taneli Virtanen, CFO  tel.358 9 2520 5655