PGS ASA — Major Shareholding Notification 2010

Jul 1, 2010

General Shareholder Disclosure Obligations under the Norwegian Securities Trading Act of 29 June 2007 No 75

1. Issuer: Petroleum Geo-Services ASA
2. Date when the threshold was reached or passed: June 29th, 2010
3. Date on which the notification duty arose (if other than in 2 above):
4. Name of the person obliged to notify, and, if voting rights are separated from the ownership of shares, the name of the shareholder: AllianceBernstein L.P.

Address: 1345 Avenue of the Americas
Postal code: NY 10105
Residence: New York
Country: USA

1. Name and qualification of the signatory: Hinde Idrissi – Compliance
2. Number of shares/rights to shares encompassed by the notification: 9,877,044
   Number of voting rights encompassed by the notification: 9,877,044
3. Percentage and number of shares and voting rights now held by the notifying entity and its Close Associates (if any):

Person obliged to notify	NUMBER OF SHARES	% OF SHARES	RIGHTS TO SHARES	% OF RIGHTS TO SHARES	NUMBER OF VOTING RIGHTS	% OF VOTING RIGHTS
AllianceBernstein	9,877,044	4.99%	0	0	9,877,044	4.99%
TOTAL	9,877,044	4.99%	0	0	9,877,044	4.99%

1. Event that triggered the notification (acquisition, subscription, sale, “passive” crossing etc). If the event that triggered the notification was related to a Close Associate of the notifying entity, please specify: Sale of voting shares
2. If the event that triggered the notification was related to a Close Associate, please specify the relationship between the notifying entity and the Close Associate in full:
3. If the notification comprises rights to shares, please describe the rights as well as when the rights can be exercised/time to maturity. Please also state whether the rights are to existing shares or a right to subscribe for new shares:

Date: June 30th, 2010
Place: Paris - France
Signature:

Hinde Idrissi
Compliance
+33 1 44 45 82 05.