26 June 2026

Union Jack Oil plc

("Union Jack" or the "Company")

Directorate Changes

Union Jack Oil plc (AIM: UJO), a UK and USA focused onshore hydrocarbon production, development and exploration company, announces that the office of John Americanos, a Non-Executive Director of the Company, has been vacated by a resolution of the Board with immediate effect.

For further information, please contact:

Union Jack Oil plc                                                                                          [email protected]

David Bramhill

SP Angel Corporate Finance LLP                                                                   +44 (0)20 3470 0470

Nominated Adviser and Joint Broker

Matthew Johnson

Richard Hail

Jen Clarke

Zeus                                                                                                                  +44 (0)20 3829 5000

Joint Broker

Antonio Bossi

Simon Johnson

George Duxberry

Gneiss Energy Limited                                                                                    + 44 (0)20 3983 9263

Financial Adviser

Jon Fitzpatrick

Luke Kanczes

Harbour Access                                                                                                 +1 (475) 477 9402

USA Investor Relations

Jonathan Paterson