Stock Options Exercised

ASKER, NORWAY (19 February 2015) - 15 employees of TGS have today, 19 February 2015, exercised in total 103,400 stock options. All options were exercised from the award in August 2011 secured by treasury shares at an exercise price of NOK 113.80 per share. Following the exercise TGS holds 1,943,512 of the issued shares as treasury shares. TGS' share capital is NOK 25,796,072.00 consisting of 103,184,288 shares at a nominal value of NOK 0.25 per share.

The following primary insiders in TGS have on 19 February 2015 traded TGS shares related to their exercise of stock options:

Knut Agersborg, VP Global Services and member of TGS' Executive management, has exercised 7,000 stock options and sold the same number of shares in TGS at an average price of NOK 182.97 per share. After this transaction Knut Agersborg holds 2,100 shares in TGS.

Martin Bett, Senior VP Reservoir Solutions and member of TGS' Executive management, has exercised 14,000 stock options and sold the same number of shares in TGS at an average price of NOK 182.97 per share. After this transaction Martin Bett does not hold any shares in TGS.

Stein Ove Isaksen, Senior VP Eastern Hemisphere and member of TGS' Executive management, has exercised 7,200 stock options and sold the same number of shares in TGS at an average price of NOK 182.97 per share. After this transaction Stein Ove Isaksen holds 2,000 shares in TGS.

Zhiming Li, Senior VP Data Processing & Research & Development and member of TGS' Executive management, has exercised 14,000 stock options and sold the same number of shares in TGS at an average price of NOK 182.97 per share. After this transaction Zhiming Li holds 105,694 shares in TGS.

Attached is the list of the primary insiders exercising stock options.

This information is subject of the disclosure requirements acc. to §5-12 vphl (Norwegian Securities Trading Act)