TGS ASA

Major Shareholding Notification • Jul 8, 2024

UBS Group AG Postfach 8098 Zürich Tel. +41-44-438 11 11

Global Shareholder Reporting Group Compliance, Regulatory & Governance

www.ubs.com

Registered Strictly confidential

Oslo Børs Box 460 Sentrum 0105 Oslo Norway

July, 8 th 2024

TGS ASA - Disclosure of large shareholdings under the Securities Trading Act

Dear Sir or Madam,

We would like to inform you that UBS Group AG has crossed above 5% of the voting rights and of the share capital in the issuer TGS ASA (NO0003078800). Please let this serve you as our disclosure as set forth below:

th July 2024

Name of the person obliged to notify: UBS Group AG

Residing at: Bahnhofstrasse 45 CH-8001 Zurich

Date of event: 5

.

Event triggering the notification: Acquisition of equity shares

Total new holding: 12,259,281 representing 6.25% of the 196,273,293 voting rights and of the share capital out of which 10,581,948 are held in shares equivalent to 5.39% and 1,677,333 equivalent to 0.85% held as financial instruments. The shares are held indirectly by UBS Group AG and directly by its subsidiaries: UBS AG, UBS Switzerland AG, UBS Europe SE, UBS Securities LLC, UBS Asset Management (UK) Limited, UBS Fund Management (Switzerland) AG, UBS Asset Management Switzerland AG, UBS Fund Management (Luxembourg) S.A., UBS Asset Management (Deutschland) GmbH & UBS Asset Management (Singapore) Ltd.

This notification has also been sent to the issuer.

If you have any questions regarding this disclosure, please contact Georgaki, Konstantina on +41-44- 239 40 71 in Zurich.

Yours faithfully,

UBS Group AG

Konstantina Georgaki Iwona Konwinska Director Associate Director