United Oil & Gas PLC / Index: AIM / Epic: UOG / Sector: Oil & Gas

12 November 2025

United Oil & Gas plc

("United" or "the Company")

United signs Vessel Contract for Jamaica Survey

United Oil & Gas Plc (AIM: "UOG"), the oil and gas company with a high-impact exploration asset in Jamaica and a development asset in the UK, following on from its announcement on the 9^th October about signing a MOU with TDI Brooks International is pleased to confirm that it has signed a contract with TDI Brooks International to supply the R/V Gyre survey vessel for the planned piston coring and surface geochemical programme on the Walton Morant Licence, offshore Jamaica.

This milestone comes as Jamaica begins its recovery from the recent hurricane, which caused significant damage in parts of the island. United extends its thoughts to all those affected and reaffirms its long-term commitment to supporting Jamaica's energy development and sustainable growth. United are continuing to work with local authorities to support the on-going relief efforts.

Highlights:

·    Contract signed with TDI Brooks International for the R/V Gyre vessel expected to arrive mid to late December 2025 for piston coring and surface geochemical survey.

·    The programme comprises the collection of 40 to 60 seabed cores from the Walton and Morant Basins, together with bathymetric, multibeam, and heat-flow surveys.

·    Operations expected to last two to three weeks; initial results expected early Q1 2026

·    Represents critical technical de-risking step supporting ongoing farm-out discussions and shareholder value creation.

·    Port infrastructure remains operational, with inspection and readiness procedures being coordinated with the relevant Jamaican authorities.

Survey Scope and Strategic Context

The piston coring and surface geochemical campaign, to be conducted by TDI Brooks International, represents a key component of United's forward work programme under its extended licence, which runs until January 2028.

The survey will acquire seabed core samples and supporting datasets designed to confirm the presence of thermogenic hydrocarbons, refine basin modelling, and enhance the definition of key prospects, including Colibri and Oriole.

Collected data will be analysed for geochemical and thermal signatures to confirm the presence of a working petroleum system offshore Jamaica. The results are expected to significantly de-risk the basin and strengthen the technical basis for ongoing farm-out discussions.

The survey operations are expected to take two to three weeks, with initial analytical results expected in early Q1 2026.

Commitment to Jamaica and Local Engagement

United continues to work closely with the Ministry of Energy, Telecommunications and Transport, the National Environment and Planning Agency, and local stakeholders as recovery efforts continue.

The Company recognises the challenges faced by coastal and fishing communities, particularly in the west, and will maintain engagement through its Country Manager in Kingston.

Brian Larkin, Chief Executive Officer of United Oil & Gas, commented:

"While Jamaica focuses on recovery from the recent hurricane, United remains fully committed to supporting the country and advancing our planned operations responsibly and is working with local authorities to support relief efforts. Further updates will be provided in due course."

Signing the vessel contract with TDI Brooks is a major step forward and it sets a clear schedule for a December mobilisation, marking the transition from planning to execution.

The piston coring and geochemical survey will provide vital new data to confirm the presence of hydrocarbons and materially de-risk the Walton Morant Basin. We expect operations to last just a few weeks, with initial results in early Q1 2026.

This programme represents a key value catalyst for United, strengthening our technical position and supporting our drive toward a successful farm-out and future drilling activity."

Further supporting materials are available on the Company's website.

Brokers

The Company confirms that Tennyson Securities and Shard Capital Limited remain as the Company's Joint Brokers.

**ENDS**

APPENDIX

Additional Information and Resources

·    Independent Risking Review Study (September 2025):

https://www.uogplc.com/wp-content/uploads/2025/09/UOG-Risking-Review-Sept-25.pdf

·    Piston Coring Presentation (October 2025):

https://www.uogplc.com/wp-content/uploads/2025/10/Jamaican-Piston-Core-Presentation-Oct-2025.pdf

·    Investor Presentation Recording:

https://www.youtube.com/watch?v=_Xcx4SV2zrE

Beaumont Cornish Limited ("Beaumont Cornish") is the Company's Nominated Adviser and is authorised and regulated by the FCA. Beaumont Cornish's responsibilities as the Company's Nominated Adviser, including a responsibility to advise and guide the Company on its responsibilities under the AIM Rules for Companies and AIM Rules for Nominated Advisers, are owed solely to the London Stock Exchange. Beaumont Cornish is not acting for and will not be responsible to any other persons for providing protections afforded to customers of Beaumont Cornish nor for advising them in relation to the proposed arrangements described in this announcement or any matter referred to in it.

Notes to Editors

United Oil & Gas is an oil and gas company with a development asset in the UK and a high impact exploration licence in Jamaica.

The business is led by an experienced management team with a strong track record of growing full cycle businesses, partnered with established industry players and is well positioned to deliver future growth through portfolio optimisation and targeted acquisitions.

United Oil & Gas is listed on the AIM market of the London Stock Exchange. For further information on United Oil and Gas please visit www.uogplc.com