15^th July 2025

Helix Exploration PLC
("Helix Exploration" or "Helix" or the "Company")

Commencement of Plant Construction

Helix Exploration, the helium exploration and development company with near-term production assets within the 'Montana Helium Fairway', is pleased to announce the commencement of civils work and plant construction at its flagship Rudyard Project, Montana.

Highlights:

·   Civil construction underway at the Rudyard Plant site, including ground clearance and compaction prior to installation of a reinforced concrete pad.

·    PSA plant and membrane modules from Texas to Montana on track for delivery in August 2025.

·    Compressor units expected to follow soon after.

·    First helium production targeted to commence once final equipment delivery & integration is completed onsite.

Bo Sears, CEO of Helix Exploration, commented:

"We are now fully underway with construction at the Rudyard Plant site, another important step toward being the first helium producer in the State of Montana. With four production wells already drilled, a fifth in progress, and equipment mobilisation underway, Helix remains focused on delivering one of the most cost-effective and rapid developments in the North American helium sector."

Background

Civil works commenced at the Rudyard Plant site in early July 2025, with pad grading and compaction progressing ahead of equipment installation. The site occupies the highest point on the 20-acre lease, allowing for optimal drainage and layout.

The PSA & membranes are scheduled for delivery to Montana as soon as the pad work is completed.

Preparations for the gas gathering system are also advancing with material procurement  underway.  On-site installation should begin in August 2025 depending on delivery of 4" piping from Wyoming.

Final integration and commissioning of the plant remain contingent on delivery of the helium compressor skid.  Coordination with vendors and programmers is ongoing to finalise the control logic, with a preference for a soft-start configuration to reduce fuel usage and improve control during initial startup.

First helium production will commence following completion of compressor installation, plant hookup, and regulatory inspection.

Helix will continue to provide updates on construction progress via RNS and social media channels as activity progresses.

This announcement contains inside information for the purposes of the UK Market Abuse Regulation, and the Directors of the Company are responsible for the release of this announcement.

Enquiries

Helix Exploration

Cairn - Nominated Adviser

Hannam & Partners - Joint Broker

Camarco - Financial PR

Notes to Editors

Helix Exploration is a helium exploration company focused on the exploration and development of helium deposits within the 'Montana Helium Fairway'. Founded by industry experts with extensive experience of helium systems in the US, the Company listed in April 2024.

Helix is focused on production at its Rudyard Project in northern Montana, taking advantage of existing infrastructure and low-cost processing to target first gas in 2025. The Company has three production wells targeting up to 236ft Helium / Nitrogen gas in the Souris and Red River formations, flowing up to 3,800 Mcf/day at 1.2% helium. Rudyard field can support multiple production wells and has potential to generate net revenue of $115 - $220 million over a 12.5 year life of field.

Helix is committed to open and transparent communication with investors and the wider market as the project progresses through development into production.

"Our approach is simple: build scale efficiently, develop resources strategically, and deliver near-term cash flow." CEO - Bo Sears

The Company's Admission Document, and other information required pursuant to AIM Rule 26, is available on the Company's website at https://www.helixexploration.com/.

Caution regarding forward looking statements

Certain statements in this announcement, are, or may be deemed to be, forward looking statements. Forward looking statements are identified by their use of terms and phrases such as ''believe'', ''could'', "should" ''envisage'', ''estimate'', ''intend'', ''may'', ''plan'', ''potentially'', "expect", ''will'' or the negative of those, variations or comparable expressions, including references to assumptions. These forward-looking statements are not based on historical facts but rather on the Directors' current expectations and assumptions regarding the Company's future growth, results of operations, performance, future capital and other expenditures (including the amount, nature and sources of funding thereof), competitive advantages, business prospects and opportunities. Such forward looking statements reflect the Directors' current beliefs and assumptions and are based on information currently available to the Directors.