Spudding of Crossroads Well Oklahoma USA

6 May 2026

Union Jack Oil plc

("Union Jack" or the "Company")

Spudding of Crossroads Well Oklahoma USA

Union Jack Oil plc (AIM: UJO), a UK and USA focused onshore hydrocarbon, production, development, exploration and investment company, is pleased to announce that, further to the update on 1 May 2026, the Company has been informed by Reach Oil and Gas Company Inc. (the "Operator"), that the Crossroads Well was spudded on 5 May 2026. The drilling period is expected to be approximately 10 days and shareholders will be informed of the results in due course.

Union Jack currently holds a 43% interest in the project. The Company's share of the drilling costs have been funded from its existing cash resources.

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 Capital Limited +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

Harbour Access +1 (475) 477 9402

USA Investor Relations

Jonathan Paterson