Preliminary Result of Subsequent Offering

NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, IN WHOLE OR IN PART, DIRECTLY OR INDIRECTLY, IN OR INTO THE UNITED STATES, AUSTRALIA, CANADA OR JAPAN, OR ANY OTHER JURISDICTION IN WHICH THE RELEASE, PUBLICATION OR DISTRIBUTION WOULD BE UNLAWFUL.

THIS ANNOUNCEMENT DOES NOT CONSTITUTE AN OFFER OF ANY OF THE SECURITIES DESCRIBED HEREIN.

Reference is made to previous announcements by Petroleum Geo-Services ASA (the "Company") in respect of the subsequent offering of up to 13,500,000 new shares in the Company (the "Subsequent Offering") at a subscription price of NOK 22.50 per share.

The subscription period ended on January 5, 2017 at 16:30 hours (CET).

A preliminary counting indicates that the Company has received subscriptions for approximately 43.6 million new shares in the Subsequent Offering, and the Subsequent Offering was accordingly 3.2x subscribed.

The allocation of the shares in the Subsequent Offering is expected to be resolved by the Company during today on January 6, 2017, in accordance with the allocation criteria set out in the Company's prospectus dated December 15, 2016. The final result of the Subsequent Offering will be published shortly thereafter, and subscribers who are allocated shares will receive a letter with the number of allocated new shares and the corresponding subscription amount to be paid by each of the subscribers.

DNB Markets, a part of DNB Bank ASA and Nordea Markets, a part of Nordea Bank Norge ASA are acting as Managers for the Subsequent Offering.

Contacts:

Bård Stenberg, VP IR & Corporate Communications: Phone: +47 67 51 43 16, Mobile: +47 992 45 235

Gottfred Langseth, EVP & CFO: Phone: +47 67 51 44 10, Mobile: +47 930 55 580

Rune Olav Pedersen, EVP & General Counsel: Phone: +47 67 51 57 06, Mobile: +47 908 16 337

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Petroleum Geo-Services ASA ("PGS" or "the Company") is a focused Marine geophysical company that provides a broad range of seismic and reservoir services, including acquisition, imaging, interpretation, and field evaluation. The Company's MultiClient data library is among the largest in the seismic industry, with modern 3D coverage in all significant offshore hydrocarbon provinces of the world. The Company operates on a worldwide basis with headquarters in Oslo, Norway.

For more information on PGS visit www.pgs.com.

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This announcement does not constitute or form part of an offer for sale or solicitation of an offer to purchase or subscribe for securities in the United States or any other jurisdiction. The securities referred to herein have not been and will not be registered under the U.S. Securities Act of 1933, as amended (the "Securities Act"), and may not be offered or sold, directly or indirectly, in the United States, absent registration under or an exemption from, or in a transaction not subject to, the registration requirements of, the Securities Act. No public offering of securities is being made in the United States or in any other jurisdiction.

The offering of the securities referred to in this announcement will be made pursuant to an exemption under the Prospectus Directive, as implemented in Member States of the European Economic Area, from the requirement to produce a prospectus for offers of securities.  This announcement does not constitute an advertisement for the purposes of the Prospectus Directive.

This announcement does not constitute an offer to sell or the solicitation of an offer to buy any securities, nor will there be any sale of securities referred to in this announcement, in any jurisdiction, including the United States, in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of such jurisdiction.

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.

DNB Markets, a part of DNB Bank ASA and Nordea Markets, a part of Nordea Bank Norge ASA (together, the "Managers") are each acting exclusively for the Company and for no-one else in connection with any transaction mentioned in this announcement and will not regard any other person (whether or not a recipient of this announcement) as a client in relation to any such transaction and will not be responsible to any other person for providing the protections afforded to their respective clients, or for advising any such person on the contents of this announcement or in connection with any transaction referred to in this announcement. The contents of this announcement have not been verified by the Managers.

No representation or warranty, express or implied, is given by or on behalf of the Managers or any of their respective subsidiaries, affiliates, agents or advisers or any of such persons' affiliates, directors, officers or employees or any other person as to the fairness, truth, accuracy, completeness or verification of the information or the opinions contained in this announcement (or whether any information has been omitted from the announcement) or any other information relating to the Company, its subsidiaries or associated companies, whether written, oral or in a visual or electronic form, and howsoever transmitted or made available, and no liability is accepted for any such information, omissions or opinions.

For a further description of other relevant risk factors we refer to the prospectus dated 15 December 2016. 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. The reservation is also made that inaccuracies or mistakes may occur in the information given above about current status of the Company or its business. Any reliance on the information above is at the risk of the reader, and PGS disclaims any and all liability in this respect.

This information is subject to the disclosure requirements of section 5-12 of the Norwegian Securities Trading Act.