Extension of the offer period for the recommended voluntary exchange offer for all shares in Magseis Fairfield ASA

NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, IN WHOLE OR IN PART, DIRECTLY OR INDIRECTLY, INTO OR WITHIN AUSTRALIA, CANADA, HONG KONG, JAPAN, SOUTH AFRICA, THE UNITED STATES OR ANY OTHER JURISDICTION IN WHICH THE DISTRIBUTION OR RELEASE WOULD BE UNLAWFUL

OSLO, Norway (21 September 2022) – Reference is made to the stock exchange announcement on 29 June 2022 regarding the recommended voluntary exchange offer (the "Offer") by TGS ASA ("TGS" or the "Offeror", OSE: TGS) to acquire all shares in Magseis Fairfield ASA ("Magseis Fairfield" OSE: MSEIS) and to the stock exchange announcement on 24 August 2022 regarding the formal launch of the Offer. Reference is also made to the offer document for the Offer dated 24 August 2022 (the "Offer Document"), and to the stock exchange announcement on 20 September 2022 regarding the remainder of the expiry of the offer period.

Subject to the terms and conditions set out in the Offer Document, TGS is offering a consideration to the Magseis Fairfield shareholders in the form of (i) 0.0426 ordinary shares of TGS and (ii) NOK 2.3592 in cash, per Magseis Fairfield share.

The Offeror hereby announces an extension of the offer period for the Offer (the "Offer Period") until 16:30 hours (CEST) on 28 September 2022, in accordance with section 3.3.3 (Offer period) and 3.3.6 (Amendments to the offer) of the Offer Document. As a consequence of the extension, the settlement of the Offer will be postponed correspondingly. The other terms and conditions of the Offer will remain unchanged and as set out in the Offer Document.

The extension has been approved by the Oslo Stock Exchange in its capacity as take-over authority. the Offeror maintains its right to further extend the Offer Period (one or more times) on the terms and conditions set out in the Offer Document, however so that the Offer Period may not be extended beyond 16:30 hours (CET) on 1 November 2022.

The Offeror will send a separate stock exchange announcement with an update on the level of acceptances received and its shareholding in Magseis Fairfield no later than before the Oslo Stock Exchange opens tomorrow on 22 September 2022, due to ongoing counting of received acceptances. The Offeror does currently not hold any Magseis Fairfield shares.

Completion of the Offer remains subject to the fulfilment or waiver by the Offeror of the conditions for completion of the Offer as set out in Section 3.3.4 (Conditions for completion of the Offer) of the Offer Document (including the condition for acceptance of the Offer by shareholders representing more than 90% of the shares and votes of Magseis Fairfield on a fully diluted basis), other than the regulatory approvals condition set out in Section 3.4.10 of the Offer Document which was announced as satisfied in a stock exchange announcement made on 6 September 2022.

However, to the Offeror's knowledge, none of the conditions for the Offer that refer to events that shall or shall not occur, are as of the date hereof not satisfied or not capable of being satisfied. The complete terms and conditions for the Offer and procedures for accepting the Offer are set out in the Offer Document (as amended by this stock exchange announcement). The Offer can only be accepted based on the Offer Document. Acceptances of the Offer already received will remain binding and there is no need for shareholders that have already accepted the Offer to take any further action to confirm their acceptances or otherwise. Shareholders that want to accept the Offer, and have not already done so, must complete and submit the acceptance form which is included in the Offer Document before 16:30 hours (CEST) on 28 September 2022.

The Offer Document and the acceptance form are, subject to regulatory restrictions in certain jurisdictions, electronically available at www.abgsc.com where also contact information can be found for questions related to the Offer and the acceptance form. The acceptance form includes information on how and where to submit the form in order to accept the Offer.

Advisors:

ABG Sundal Collier ASA acts as financial advisor to TGS and receiving agent for the Offer. Advokatfirmaet Schjødt AS acts as legal advisor to TGS. Arctic Securities AS acts as financial advisor and Advokatfirmaet Thommessen AS acts as legal advisor to Magseis Fairfield.

Contact:

TGS: Sven Børre Larsen, CFO
Tel: +47 909 43 673
Email: investor@tgs.com

About TGS
TGS provides scientific data and intelligence to companies active in the energy sector. In addition to a global, extensive and diverse energy data library, TGS offers specialized services such as advanced processing and analytics alongside cloud-based data applications and solutions

Important notice
This information is subject to the disclosure requirements pursuant to section 5-12 of the Norwegian Securities Trading Act.

It may be unlawful to distribute this announcement in certain jurisdictions. This announcement is not for distribution in Australia, Canada, the Hong Kong special administrative region of the People's Republic of China, Japan, South Africa, the United States or to any other jurisdiction where such distribution would be unlawful. The information in this announcement does not constitute an offer of securities for sale in such jurisdictions. Persons into whose possession this release comes should inform themselves about and observe any such restrictions. Any failure to comply with these restrictions may constitute a violation of the securities laws of any such jurisdiction. This announcement does not constitute an offer for sale of, or a solicitation of an offer to purchase or subscribe for, any securities in the United States.

The Offer or Consideration Shares referred to in this release have not been and will not be registered under the United States Securities Act of 1933, as amended (the "U.S. Securities Act"), or any state securities laws and may not be offered or sold within the United States or to U.S. Persons unless registered under the U.S. Securities Act and applicable state securities laws or an exemption from such registration is available. The information contained in this announcement is for informational purposes only and does not purport to be full or complete. TGS does not intend to conduct a public offering in the United States. The Consideration Shares will only be sold to persons outside the United States in accordance with Regulation S of the U.S. Securities Act. For U.S. persons or to persons that are otherwise subject to the securities laws of the United States, the Consideration Shares will only be sold to "accredited investors," as defined in Rule 501(a) under Regulation D under the U.S. Securities Act, pursuant to the exemption from registration provided by Rule 506(c) under such U.S. Securities Act. Copies of this announcement are not being, and should not be, distributed in or sent into the United States.

In the United Kingdom, this announcement is for distribution only to and is directed only at persons who (i) have professional experience in matters relating to investments which fall within Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 (as amended, the "Financial Promotion Order"), (ii) are persons falling within Article 49(2)(a) to (d) ("high net worth companies, unincorporated associations etc") of the Financial Promotion Order, or (iii) are persons to whom an invitation or inducement to engage in investment activity (within the meaning of section 21 of the Financial Services and Markets Act 2000) in connection with the issue or sale of any securities may otherwise lawfully be communicated or caused to be communicated (all such persons together being referred to as "relevant persons").

This announcement is directed only at relevant persons and must not be acted on or relied on by persons who are not relevant persons. Any investment or investment activity to which this announcement relates is available only to relevant persons and will be engaged in only with relevant persons. This announcement has been prepared on the basis that any offer of securities in any Member State of the European Economic Area which has implemented the Prospectus Regulation (EU) (2017/1129, as amended, the "Prospectus Regulation") (each, a "Relevant Member State") will be made pursuant to an exemption under the Prospectus Regulation, as implemented in that Relevant Member State, from the requirement to publish a prospectus for offers of securities. Accordingly, any person making or intending to make any offer in that Relevant Member State of securities, which are the subject of the offering contemplated in this announcement, may only do so in circumstances in which no obligation arises for TGS to publish a prospectus pursuant to Article 3 of the Prospectus Regulation or supplement a prospectus pursuant to Article 16 of the Prospectus Regulation, in each case, in relation to such offer. Neither TGS nor any of the advisors have authorized, nor do they authorize, the making of any offer of the securities through any financial intermediary, other than offers made by TGS which constitute the final placement of the securities contemplated in this announcement. Neither TGS nor any of the advisors have authorized, nor do they authorize, the making of any offer of securities in circumstances in which an obligation arises for the company to publish or supplement a prospectus for such offer.

This release contains certain forward-looking statements within the meaning of the securities laws and regulations of various international, federal, and state jurisdictions. All statements, other than statements of historical fact, included herein, including without limitation, statements regarding the Offer or the future plans and objectives of TGS or Magseis Fairfield are forward-looking statements that involve risk and uncertainties. There can be no assurances that such statements will prove to be accurate and actual results could differ materially from those anticipated in such statements.

Neither TGS, Magseis Fairfield nor any of their advisors and/or any of their affiliates or any of their respective directors, officers, employees, advisers, agents or any other person(s) accept any responsibility or liability whatsoever for, or make any representation or warranty, express or implied, as to the accuracy, completeness or fairness of the information or opinions in this announcement (or whether any information has been omitted from this announcement) or any other information relating the Offer, TGS or Magseis Fairfield.

The issue, subscription or purchase of shares in TGS is subject to specific legal or regulatory restrictions in certain jurisdictions. Neither TGS, Magseis Fairfield nor their advisors assume any responsibility in the event there is a violation by any person of such restrictions.

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