F-Secure Corporation
September 3, 2013 at 15.05

Announcement pursuant to Securities Act Chapter 2, Section 10

F-Secure Corporation has today been informed by Mandatum that the holding of
Mandatum Life Insurance Company Limited in F-Secure has exceeded 5 % (1/20) and
is currently 5.51%. 

1. The company: F-Secure Corporation

2. The date of change in holding: September 3, 2013

3. Exact proportion of voting rights and share capital in F-Secure Corporation:
    Totally 8,756,428 shares, 5.51% of share capital and voting rights.

4. Shareholder's name and register number: Mandatum Life Insurance Company
Limited, register number: 0641130-2 


F-Secure Oyj
Taneli Virtanen
CFO
tel. +358 40 752 0655