NOTIFICATION UNDER CHAPTER 2, SECTION 10 OF THE FINNISH SECURITIES MARKET ACT

Espoo, Finland - September 28, 2000

F-Secure Corporation has today received a notification from Risto Siilasmaa, pursuant to which his voting participation in and percentage ownership of F-Secure Corporation's share capital will fall below one-half (1/2) after the share sale arranged by Enskilda Securities AB. Title to the shares sold will be transferred on October 3, 2000.

Name of the target company: F-Secure Corporation

Date of the change in the ownership: October 3, 2000

Exact percentage of F-Secure Corporation's voting participation and share capital: After the share sale, Risto Siilasmaa will own 49,7 percent of F-Secure Corporation's voting participation and share capital

Shareholder's name: Risto Siilasmaa

F-Secure Corporation

Risto Siilasmaa President, CEO

Additional information:
F-Secure Corporation
Risto Siilasmaa, President and CEO tel.358 9 2520 5510
Jukka Kotovirta, Director tel.358 9 2520 5542 http://www.F-Secure.com