STOCK EXCHANGE ANNOUNCEMENT 5 DECEMBER 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 9 of the Finnish Securities Market Act, of a change in the company's ownership: Osuuspankkikeskus Osk (”OPK”) has on 5 December, 2007 informed Ixonos that the combined ownership of the investment funds managed by OPK's subsidiaries has fallen under the 5% limit because of an increase in the company's share capital. Altogether, OPK and the entities it controls own 437,610 shares in Ixonos, corresponding to 4.92% of Ixonos's shares and votes. Ixonos has one share series. The company's share capital is EUR 355,485.20, and the total number of shares is 8,887,130. 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: OMX Nordic Exchange Helsinki Main media