TGS ASA — Director's Dealing 2018

Aug 9, 2018

TGS - Mandatory Notification of Trade

TGS - Mandatory Notification of Trade

HOUSTON, TEXAS (9 August 2018) - Zhiming Li, SVP Imaging, has today sold 32,800

shares in TGS-Nopec Geophysical Company ASA at an average price of NOK 347.8834

per share. Following the transaction, Mr. Li holds 75,694 shares and 89,000

Performance Share Units (PSUs) in the company.

Company Summary

TGS-NOPEC Geophysical Company (TGS) provides multi-client geoscience data to oil

and gas Exploration and Production companies worldwide.  In addition to

extensive global geophysical and geological data libraries that include multi-

client seismic data, magnetic and gravity data, digital well logs, production

data and directional surveys, TGS also offers advanced processing and imaging

services, interpretation products, and data integration solutions.

For more information visit TGS online at www.tgs.com.

Forward-looking statements and contact information

All statements in this press release other than statements of historical fact

are forward-looking statements, which are subject to a number of risks,

uncertainties and assumptions that are difficult to predict, and are based upon

assumptions as to future events that may not prove accurate. These factors

include TGS' reliance on a cyclical industry and principle customers, TGS'

ability to continue to expand markets for licensing of data, and TGS' ability to

acquire and process data products at costs commensurate with profitability.

Actual results may differ materially from those expected or projected in the

forward-looking statements. TGS undertakes no responsibility or obligation to

update or alter forward-looking statements for any reason.

TGS-NOPEC Geophysical Company ASA is listed on the Oslo Stock Exchange

(OSLO:TGS).

TGS sponsored American Depositary Shares trade on the U.S. over-the-counter

market under the symbol "TGSGY".

For additional information about this press release please contact:

Sven Børre Larsen

Chief Financial Officer

Tel: +47 90 94 36 73

Email: sven.larsen@tgs.com

Will Ashby

SVP Investor Relations, HR & Communication

Tel: +1 713 860 2184

Email: will.ashby@tgs.com

This information is subject to the disclosure requirements pursuant to section

5-12 of the Norwegian Securities Trading Act.