TGS ASA provides seismic data, magnetic & gravity data, well logs, production data, and directional surveys as well as processing, imaging, and software services. Operations are organized into three divisions: Eastern Hemisphere (EH), Western Hemisphere (WH), and New Energy Solutions (NES). Common shares are listed on the OSE (TGS) and OTC Pink (TGSSY) exchanges.

In 1981, Tomlinson Geophysical Services (TGS) was founded in Houston, and Norwegian Petroleum Consultants (NOPEC) was founded in Oslo. TGS and Nopec merged in 1998 and acquired Bedford Interactive Processing. Subsequent acquisitions include Houston-based well log data company A2D Technologies in 2002, Houston-based imaging company NuTec Energy in 2004, London-based multi-client interpretation company Aceca Geologica in 2005, and Houston-based imaging services company Parallel Data Systems in 2007.

In 2010, the directional survey operations of P2 Energy Solutions' Tobin division was acquired. Permanent reservoir monitoring company Stingray Geophysical was acquired in 2011. In 2012, Houston-based Volant and Calgary-based Arcis Seismic were acquired. GIS data company Digital Petrodata was acquired in 2015. In 2019, TGS acquired Norway-based Spectrum and Texas-based production data company Lasser. The company formed a New Energy Solutions (NES) business unit in February 2021. In May 2021, TGS acquired U.K.-based 4C Offshore. TGS-NOPEC was shortened to TGS in June 2021.

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