4 June 2024

Mosman Oil and Gas Limited

("Mosman" or the "Company")

Warrant Exercise

Mosman Oil and Gas Limited (AIM: MSMN) the hydrocarbon, helium and hydrogen exploration, development and production company, announces that it has received notification to exercise warrants over a total of 264,000,000 new Ordinary Shares of no par value in the share capital of the Company (the 'Warrant Shares') at a price of 0.0125 pence per share.

The funds from the exercise of the warrants of circa AUD 63,000 will be added to Mosman's existing cash reserves.

Total Voting Rights

Application will be made to the London Stock Exchange plc for 264,000,000 new Ordinary Shares to be admitted to trading on the AIM market ("Admission") with Admission expected to occur on or around 7 June 2024. The new Ordinary Shares will rank pari passu in all respects with the existing Ordinary Shares including the right to receive any dividend or other distribution thereafter declared, made or paid. There are no Ordinary Shares held in treasury. Following Admission of the 264,000,000 new Ordinary Shares the total number of voting rights in the Company will be 12,601,362,930.

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 in their interest in, the share capital of the Company under the Company's Constitution.

Market Abuse Regulation (MAR) Disclosure

The information contained within this announcement is deemed by the Company to constitute inside information as stipulated under the Market Abuse Regulations (EU) No. 596/2014 ('MAR') which has been incorporated into UK law by the European Union (Withdrawal) Act 2018. Upon the publication of this announcement via Regulatory Information Service ('RIS'), this information is now considered to be in the public domain.

Enquiries:

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

Notes to editors

Mosman (AIM: MSMN) is a hydrocarbon, helium and hydrogen exploration, development and production company with projects in the US and Australia.

Mosman's strategic objectives remain consistent: to identify opportunities which will provide operating cash flow and have development upside whilst maximising the opportunity for further production growth and increasing cashflow from its current US projects.

In addition, Mosman has two exploration areas in the Amadeus Basin in Central Australia which are well positioned to take advantage of the increasing demand for Helium and Hydrogen, in addition to oil and gas.