7 May 2024

Mosman Oil and Gas Limited

("Mosman" or the "Company")

Production Increases strongly at Stanley

and progress at EP145

Mosman Oil and Gas Limited (AIM: MSMN) the hydrocarbon, helium and hydrogen exploration, development, and production company, provides an update on its Stanley project in the US (34.85% to 38.5% WI) where the recent gross production has increased 84% to circa 221 boepd (30 day average flow rate in April). This is a material improvement from the recently notified March quarter gross average flow rate of 120 boepd.

This significant increase has been achieved following a recompletion of Stanley-3 which is now flowing oil and gas.  The Company will provide details on production at all assets as part of its June 2024 quarter update.

In Australia on EP 145, the A$160,000 payment, which was due upon completion of the previously announced Farmin Agreement with Greenvale Energy Pty Ltd (ASX:GRV), has been received as expected. Additional prior exploration expenditure amounts of circa A$100,000 will be invoiced and reimbursed under the terms of the Farmin Agreement. In addition, an environmental bond of circa $55,000 will be cashed in.

Andy Carroll, CEO of Mosman commented: "I am pleased that the continued work on the Stanley project is now achieving stronger production numbers, which improves revenues and is a pre-requisite to sale of the asset in the future. This combined with the progress made in Australia, with the completion of the EP 145 Farmin, moves Moman into a more robust position with a strengthened balance sheet."

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 an oil 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, in conjunction with progressing exploration of existing exploration permits. The Company has several projects in the US, in addition to exploration projects in the Amadeus Basin in Central Australia.