Press Release

The report prepared by Ledouble SAS, appointed as independent appraiser to give an opinion on the fairness to the shareholders of the contemplated financial restructuring of CGG as a whole, is available on the website www.cgg.com.

CGG announces that, today, the Autorité des marchés financiers granted visa n°17-551 to the prospectus (in the French language) made available to the public in connection with:

CGG
Société Anonyme with a share capital of €17,706,519
Registered office: Tour Maine Montparnasse, 33 avenue du Maine, 75015 Paris
Paris Trade and Company Register No.: 969 202 241