Launch of CGG Reverse Stock Split

Paris, France | Jun 3, 2016

The Company has set the date to carry out the reverse stock split that the combined general shareholders’ meeting approved on 27 May 2016.

The reverse stock split operations will begin on 20 June 2016 in accordance with the terms of the reverse stock split notice published on 3 June 2016 in the Bulletin des Annonces Légales Obligatoires (BALO).

Reverse Stock Split Terms

All shareholders will automatically receive from their financial intermediary one new share and all rights pertaining to shares, in exchange for 32 former shares.

The Company reverse stock split will take effect on 20 July 2016.

The first share price on 20 July 2016 will be calculated on the basis of the last share price traded on 19 July 2016 multiplied by 32.

Shareholders who hold a total number of shares that is an exact multiple of 32 will need to take no action, and the reverse stock split will be carried out automatically on 20 July 2016.

Shareholders who do not hold a total number of shares that is an exact multiple of 32 must, between today and 19 July 2016 inclusive, deal with their fractional shares by purchasing or selling directly on the market the number of shares needed to obtain a multiple of 32.

After that date, shareholders who have been unable to obtain the number of former shares necessary for the reverse stock split will be compensated by their financial intermediary within 30 days from 20 July 2016. The former shares (ISIN code: FR0000120164) will be delisted from Euronext on 20 July 2016 and on that date will be replaced by the new reverse split shares (ISIN code: FR0013181864).