Trading halt request for December 1, 2017 starting 2pm

Paris, France | Nov 30, 2017

The decision by the Commercial Court of Paris on the approval of the draft safeguard plan and on the claim filed against it by certain holders of convertible bonds is expected in the afternoon of December 1, 2017. Therefore, the Company will ask for a trading halt on the Company’s shares (ISIN : FR 0013181864), convertible bonds due 2019 (ISIN : FR 0011357664) and convertible bonds due 2020 (ISIN : FR 0012739548) on Euronext Paris and CGG’s American Depository Shares (symbol “CGG”) on the New York Stock Exchange from Friday December 1, 2017 at 2:00pm (CET), until the close of the French market.