IXONOS PLC STOCK EXCHANGE RELEASE 21.5.2007 ANNOUNCEMENT UNDER THE SECURITIES MARKET ACT, CHAPTER 2, SECTION 10 We hereby announce that Ixonos Plc has been notified, in accordance with Chapter 2, Section 10 of the Finnish Securities Market Act, of a change in the company's ownership: Osuuspankkikeskus Osk (”OPK”) has on May 18, 2007 informed Ixonos that ownership share of Ixonos Plc's votes and share capital by investment fund of OPK's subsidiaries has increased over onetwentieth (1/20). Altogether OPK and the entities OPK has control to own 400,000 shares of Ixonos, corresponding to 5,39 % of Ixonos' shares and votes. The share capital of Ixonos Plc comprises in total EUR 296,948 and 7,423,700 shares. IXONOS PLC Kari Happonen President and CEO ADDITIONAL INFORMATION: Ixonos Plc CFO Petteri Mussalo, puh. +358 424 2231, GSM +358 400 193 779 petteri.mussalo@ixonos.com DISTRIBUTION: Helsinki Stock Exchange Main Media