Results of Retail Offer.

NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, DIRECTLY OR INDIRECTLY, IN WHOLE OR IN PART, IN OR INTO THE UNITED STATES, AUSTRALIA, CANADA, SOUTH AFRICA OR JAPAN OR ANY OTHER JURISDICTION WHERE, OR TO ANY OTHER PERSON TO WHOM, TO DO SO MIGHT CONSTITUTE A VIOLATION OR BREACH OF ANY APPLICABLE LAW OR REGULATION. PLEASE SEE THE IMPORTANT NOTICE AT THE END OF THIS ANNOUNCEMENT.

THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION FOR THE PURPOSES OF REGULATION (EU) 596/2014 AS IT FORMS PART OF DOMESTIC LAW IN THE UNITED KINGDOM BY VIRTUE OF THE EU (WITHDRAWAL) ACT 2018.

21 May 2025

Mosman Oil and Gas Limited

Results of Retail Offer

Mosman Oil and Gas ("Company") (AIM:MSMN) is pleased to announce that, further to its announcement of 16 May 2025, it has raised £300,000 (before expenses) via the issue of 666,666,666 new ordinary shares of no par value each in the capital of the Company (the "Retail Offer Shares") at a price of 0.045p per share (the "Issue Price"), pursuant to its offer to its existing retail shareholders via CMC CapX. (the "Retail Offer").

Under the Placing and the Retail Offer, the Company has raised aggregate gross proceeds of £1.55m.

A separate announcement has been made regarding the Placing and its terms. For the avoidance of doubt, the Retail Offer is separate from and does not form part of the Placing.

Admission to AIM and Total Voting Rights

The Retail Offer is conditional on, inter alia, the Retail Offer Shares being admitted to trading on AIM. Application has been made to the London Stock Exchange for the Retail Offer Shares, which will rank pari passu with the Company's existing issued ordinary shares, to be admitted to trading on AIM and dealings are expected to commence at 8:00 a.m. on or about 27 May 2025. Completion of the Retail Offer is also conditional, inter alia, upon the completion of the Placing, which is expected to complete on admission of the Placing Shares on 22 May 2025.

Following the issue of the Retail Offer Shares, the Company's total voting rights will comprise 22,981,521,662 Ordinary Shares of no par value and the Company does not hold any shares in treasury. Consequently, the above figure may be used by shareholders in the Company as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, the share capital of the Company in accordance with the Companies' Articles.

For Further information

Updates on the Company's activities are regularly posted on its website: www.mosmanoilandgas.com

This announcement should be read in its entirety. In particular, the information in the "Important Notices" section of the announcement should be read and understood.

Important Notices

The contents of this announcement have been prepared by and issued by the Company and is the sole responsibility of the Company. The Board of Directors of the Company are responsible for arranging the release of this announcement on behalf of the Company.

This announcement is not for publication or distribution, directly or indirectly, in or into the United States of America. This announcement is not an offer of securities for sale into the United States.  The securities referred to herein have not been and will not be registered under the U.S. Securities Act of 1933, as amended, and may not be offered or sold in the United States, except pursuant to an applicable exemption from registration. No public offering of securities is being made in the United States.

This announcement and the information contained herein is not for release, publication or distribution, directly or indirectly, in whole or in part, in or into or from Australia, Canada, Japan, the Republic of South Africa, or any other jurisdiction where to do so might constitute a violation of the relevant laws or regulations of such jurisdiction.

The distribution of this announcement may be restricted by law in certain jurisdictions and persons into whose possession any document or other information referred to herein comes should inform themselves about and observe any such restriction. Any failure to comply with these restrictions may constitute a violation of the securities laws of any such jurisdiction.

CMC CapX is a software and technology platform owned and operated by CMC Markets UK plc (trading as CMC CapX) (registered address at 133 Houndsditch, London, EC3A 7BX). CMC Markets UK plc ("CMC") is authorised and regulated in the United Kingdom by the FCA, is acting exclusively for the Company and for no-one else and will not regard any other person (whether or not a recipient of this announcement) as its client in relation to the Retail Offer and will not be responsible to anyone other than the Company for providing the protections afforded to its clients, nor for providing advice in connection with the Retail Offer, Admission and the other arrangements referred to in this announcement.