Opcon puts back publication date for its offer document to 18 March 2010

This press release may not, directly or indirectly, be distributed or published in the United States, Australia, Japan, Canada, Switzerland or South Africa. The offer is not directed to such persons whose participation is conditional upon the performance of prospectus, registration or other procedures in addition to those prescribed in Swedish law.

On 10 February 2010 Opcon AB made a public offer to shareholders of Tricorona to transfer all of their shares in Tricorona in exchange for newly issued shares in Opcon. In the preliminary timetable presented in connection with the announcement of the offer it was stated that an official offer document would be published on 16 March 2010. The new estimated date for publication is 18 March 2010. The preliminary timetable otherwise remains unchanged as follows: Preliminary timetable Offer document published 18 March 2010 First day for acceptance of the offer 23 March 2010 Final day for acceptance of the offer 13 April 2010 Reporting of settlement 19 April 2010 For further information please contact: Niklas Johansson, vice president, Investor Relations, tel. 08-466 45 00, 070-592 54 53 Opcon AB, Box 15085, 104 65 Stockholm Tel. 08-466 45 00, fax 08-716 76 61 e-post: info@Opcon.se www.Opcon.se