NOT FOR DISTRIBUTION OR RELEASE, IN WHOLE OR IN PART, DIRECTLY OR INDIRECTLY, IN OR INTO THE UNITED STATES OF AMERICA, AUSTRALIA, CANADA, HONG KONG OR JAPAN, OR ANY OTHER JURISDICTION IN WHICH THE DISTRIBUTION OR RELEASE WOULD BE UNLAWFUL. THIS ANNOUNCEMENT DOES NOT CONSTITUTE AN OFFER OF ANY OF THE SECURITIES DESCRIBED HEREIN.

Kristiansand, 17 December 2025: Reference is made to Euronext Oslo Børs' decision on 27 November 2025 to admit Sea1 Offshore Inc. (“Sea1” or the “Company”) to trading on Euronext Growth Oslo through a transfer from Euronext Oslo Børs (the "Admission"), as well as the Company's stock exchange notice on 12 December 2025 with minutes from the extraordinary general meeting approving the amendment of the Company's articles of association. All conditions for the Admission have now been fulfilled.

The attached information document has been prepared by Sea1 solely for the use in connection with admission to trading on Euronext Growth Oslo and will also be made available at the Company's website www.sea1offshore.com.

The first day of trading in the Company's shares on Euronext Growth Oslo will be to tomorrow, on 18 December 2025, under the ticker "SEA1". The last day of trading in the Company's shares on Euronext Oslo Børs is accordingly today, 17 December 2025.

DNB Carnegie, a part of DNB Bank ASA has acted as Euronext Growth Advisor in connection with the Admission and Advokatfirmaet Wiersholm AS has acted as legal counsel.

For further information, please contact: Bernt Omdal, Chief Executive Officer, Sea1 Offshore Inc., phone +47 915 22 299