31 May 2022

Mosman Oil and Gas Limited

("Mosman" or the "Company")

Director Dealing

Mosman Oil and Gas Limited (AIM: MSMN) the oil exploration, development, and production company, announces the following dealing in the Company's ordinary shares of no par value each ("Ordinary Shares").

On 31 May 2022 Mr John Barr, the Company's Executive Chairman, transferred 10,000,000 Ordinary Shares from Kensington Advisory Services Pty Ltd to Kensington Consulting Pty Ltd which acts as trustee of the Barr Superfund, at a price of AUD14,160 (approximately £8,000).

John Barr remains beneficially interested in 82,354,584 Ordinary Shares which equites to approximately 1.58 per cent. of the Company's issued share capital.

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 seven projects in the US: Stanley, Greater Stanley, Livingston, Winters, Challenger and Champion in East Texas and Arkoma in Oklahoma in addition to exploration projects in the Amadeus Basin in Central Australia.