OKMETIC OYJ STOCK EXCHANGE ANNOUNCEMENT 11 APRIL 2007 1 ETRA-INVEST OY'S OWNERSHIP OF OKMETIC'S SHARES TO 4.29 PERCENT Notifications of a change in holdings as required by Chapter 2, Section 9 of the Finnish Securities Markets Act: Okmetic Oyj has received notification that Etra-Invest Oy's (Trade Register number 0672234-6) total ownership of the Company has lowered to 725,000 shares, which corresponds to 4.29 percent of Okmetic's share capital and voting rights. The transactions have been made on April 10, 2007. Okmetic Oyj's share capital as recorded in the Trade Register comprises a total of 16,887,500 shares. Each share has one vote. OKMETIC OYJ Esko Sipilä Senior Vice President, Finance For more information, please contact: Senior Vice President, Finance Esko Sipilä, Okmetic Oyj, Tel. +358 9 5028 0286, email: esko.sipila@okmetic.com Distribution: Helsinki Exchanges Principal media IN BRIEF Okmetic - take it higher Okmetic is a technology Company that manufactures and carries out further processing on high-quality silicon wafers for the sensor and semiconductor industries. The Company also sells technology. Okmetic's wafers are part of a further processing chain, which produces end products that improve human interaction and quality of life. Okmetic's products are based on innovative product development, an efficient production process and a strong partner network. The Company offers its customers solutions that enhance their competitiveness and profitability. Okmetic has plants in Vantaa, Finland and in Allen, Texas in North America. The Company is quoted on the Helsinki Stock Exchange (Nordic Small Cap list: OKM1V). More information about the Company can be found at www.okmetic.com.