CGG S.A. (“CGG”) announces that the Board of Directors has unanimously approved the voluntary delisting of its American Depositary Shares (“ADSs”) from the New York Stock Exchange (“NYSE”) and its voluntary deregistration with the United States Securities and Exchange Commission (“SEC”). CGG believes that the costs associated with continuing the listing and registration of its ADSs exceed the benefits received by CGG, as the primary market for CGG shares is Euronext Paris.

Accordingly, CGG intends to file a Form 25 with the SEC on September 21, 2018 to effect the delisting with the NYSE and intends to file a Form 15F with the SEC on October 1, 2018 to terminate its SEC reporting obligations and the registration of its ADSs under the Securities Exchange Act of 1934, as amended.

The termination of the registration of its ADSs will become effective 90 days after the date of filing of the Form 15F with the SEC or such shorter period as the SEC may determine. However, as a result of the filing of a Form 15F, CGG’s obligation to file certain reports, including its obligation to file annual reports on Form 20-F and to furnish reports on Form 6-K with the SEC will be immediately suspended.

Following delisting of the ADSs from the NYSE, CGG intends to maintain its American Depositary Receipt program at “level one”. This will enable investors to retain their ADSs and facilitate trading on the U.S. over-the-counter market. The depositary of CGG’s ADR program will remain The Bank of New York Mellon.