Mandatory notification of trade

Chief Financial Officer Teitur Poulsen has bought 11.900 shares in Det norske

at an average price of NOK 25,09

Following the transaction, Teitur Poulsen holds 11.900 shares in Det

norske.

About Det norske:

Det norske oljeselskap ASA has interests in a total of 72 licenses, with 35 operatorships.

Det norske is the second-largest operating company on the Norwegian Continental Shelf both considering number of operatotships and exploration activity. I 2009 the company operated nine exploration wells or on behalf of other operators, and the high activity has continued in 2010. Det norske runs its activities in a safe and responsible manner in close cooperation with the authorities.

Det norske currently employs a staff of around 200. The company`s registered office is located in Trondheim. The company also has offices in Oslo, Harstad, and Stavanger. Det norske is listed on the Oslo Stock Exchange (DETNOR).

More information about Det norske: www.detnor.no