Company Update

Mosman Oil and Gas Limited (AIM:MSMN) the helium, hydrogen and hydrocarbon exploration, development and production company, announces a Board update, appointment of Company Secretary and change of Company address.

Appointment of Graham Duncan as Non-Executive Director

Mosman is pleased to announce the appointment of Graham Duncan as an independent Non-Executive Director. Graham is a highly experienced Fellow of the ICAEW with a 25-year track record of advising and reporting for public and private companies going through growth and transactional change. His roles include the positions of CFO and NED to Main Market London-listed groups in the mining, life sciences and technology sectors.

Graham is Non-Executive Chairman to RentGuarantor Holdings Plc (AQSE: RGG), a provider of rent guarantee services to the UK private rental sector; Chief Financial Officer to Aterian plc (LSE:ATN) a critical and strategic metals focused exploration and development company with assets in Morocco, Rwanda and Botswana; CFO to BSF Enterprise plc (LSE: BSFA, OTCQB: BSFAF), a UK listed biotech company; and CFO to Chill Brands Group Plc (LSE: CHLL, OTCQB: CHBRF) a UK listed distributor of nicotine-free and wellness products.

AIM Disclosures

Graham John William Duncan, aged 61, currently holds or has held the following directorships in the last five years:

Herencia Resources plc

Rentguarantor Limited

Mr Duncan was appointed as a director of Code Investing Limited on 1 April 2018, which appointed a creditors voluntary liquidator on 8 October 2020 and was liquidated on 12 June 2024 with insufficient funds to pay unsecured creditors.

Mr Duncan was appointed as a director of Co-Investment Debt Exchange plc on 1 April 2018, which appointed a creditors voluntary liquidator on 2 December 2020 and was liquidated on 25 November 2022 with insufficient funds to pay unsecured creditors.

Mr Duncan currently holds no ordinary shares or options in the Company.

Other than as provided in this announcement, no other disclosures in relation to Mr Duncan are required under Rule 17 or Schedule 2(g) of the AIM Rules for Companies.

Appointment of Tina Loh as Company Secretary

The Company has appointed Tina Loh CA, partner of CDTL Chartered Accountants, as Company Secretary.

Change of Company Address

The Company advises of a change in the Company Registered Office and Principal Place of Business to:

C/- CDTL Chartered Accountants

Level 4, 55 York Street, Sydney NSW 2000 Australia.