Mandatory Notification of Trade


Correction
 
May 15, 2009, Oslo, Norway:
Harald Norvik, Director in Petroleum Geo-Services ASA,
has through his company Harald Norvik Insight AS on May 15, 2009 purchased 8000 shares in Petroleum Geo-Services ASA at a price of NOK 35,20 per share.
 
Following the transaction, Harald Norvik Insight AS owns 8000 shares in Petroleum Geo-Services ASA.
 
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Petroleum Geo-Services is a focused geophysical company providing a broad range of seismic and reservoir services, including acquisition, processing, interpretation, and field evaluation. The company also possesses the world's most extensive multi-client data library. PGS operates on a worldwide basis with headquarters at Lysaker, Norway.
 
For more information on Petroleum Geo-Services visit www.pgs.com.
 
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 The information included herein contains certain forward-looking statements that address activities, events or developments that the Company expects, projects, believes or anticipates will or may occur in the future. These statements are based on various assumptions made by the Company, which are beyond its control and are subject to certain additional risks and uncertainties. The Company is subject to a large number of risk factors including but not limited to the demand for seismic services, the demand for data from our multi-client data library, the attractiveness of our technology, unpredictable changes in governmental regulations affecting our markets and extreme weather conditions. For a further description of other relevant risk factors we refer to our Annual Report for 2008. As a result of these and other risk factors, actual events and our actual results may differ materially from those indicated in or implied by such forward-looking statements.
 
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Mandatory Notification of Trade