TGS Awarded OBN 4D Contract in GoA

OSLO, Norway (20 October 2025) - TGS, a leading provider of energy data and intelligence, is pleased to announce the award of an OBN acquisition contract in Gulf of America. The 4D monitor survey is scheduled to commence in Q4 2025, and the acquisition duration is approximately 4.5 months. The contract was not included in the booked position disclosed in TGS' Q2 2025 presentation.

Kristian Johansen, CEO of TGS, commented, "The Gulf of America is a core market for our OBN business, and we are very pleased to secure this contract for a repeat IOC customer. The client values our OBN technology, and in combination with our proven track record of project execution and timely delivery, they are confident we will deliver high-quality data and insights to optimize production from one of their highest producing facilities in the Gulf of America."

For more information, visit TGS.com (http://www.tgs.com) or contact:

Bård Stenberg VP IR & Business intelligence Mobile: +47 992 45 235 investor@tgs.com (mailto:investor@tgs.com)

About TGS TGS provides advanced data and intelligence to companies active in the energy sector. With leading-edge technology and solutions spanning the entire energy value chain, TGS offers a comprehensive range of insights to help clients make better decisions. Our broad range of products and advanced data technologies, coupled with a global, extensive and diverse energy data library, make TGS a trusted partner in supporting the exploration and production of energy resources worldwide. For further information, please visit www.tgs.com (https://www.tgs.com/).

Forward Looking Statement 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 volatile market conditions, investment opportunities in new and existing markets, demand for licensing of data within the energy industry, operational challenges, and reliance on a cyclical industry and principal customers. 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.