Press Release

The general meeting of CGG which will be held on November 13, 2017 being crucial for the current restructuring process of CGG, the Company will ask for suspension of trading on the Company’s shares (ISIN : FR 0013181864), the 2019 Convertible Bonds (ISIN : FR 0011357664) and the

At the request of the French Autorité des Marchés Financiers, the Company states that today Dimensional Funds Advisors LLP informed them that they had crossed below the 1% thresholds of CGG capital and voting rights.

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.