Mendell Helium plc

Director's Dealing • Nov 10, 2025

National Storage Mechanism | Additional information

RNS Number : 8398G

Mendell Helium PLC

10 November 2025

Mendell Helium plc

("Mendell Helium" or the "Company")

Director dealing

Mendell Helium announces that Nick Tulloch, Chief Executive Officer, has acquired an aggregate of 8,683,117 warrants ("Warrants") in the Company.  Each Warrant may be exercised to subscribe for one new ordinary share in Mendell Helium.

The warrants acquired by Mr Tulloch are as follows:

No. of Warrants	Exercise price	Expiry date
7,364,500	3 pence	13 April 2027
1,318,617	6 pence	19 July 2026

The Warrants were acquired for 1 pence each (£86,831.17 in aggregate).

Following the acquisition, Mr Tulloch's holding in the Company comprises 4,823,9831 ordinary shares (representing 4.15% of the issued share capital) and an aggregate of 10,021,087 warrants and share options.

1Including shares held by his spouse and Fetlar Capital, a company controlled by Nick Tulloch and his spouse.

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.

ENDS

Engage with the Mendell Helium management team directly by asking questions, watching video summaries and seeing what other shareholders have to say. Navigate to our Interactive Investor website here: https://mendellhelium.com/s/a6a55a

Enquiries:

Investor questions on this announcement We encourage all investors to share questions on this announcement via our investor website	https://mendellhelium.com/s/a6a55a
Mendell Helium plc Nick Tulloch, CEO	Via our website [email protected]
Cairn Financial Advisers LLP (AQSE Corporate Adviser) Ludovico Lazzaretti / Liam Murray	Tel:  +44 (0) 20 7213 0880
SI Capital Limited (Broker) Nick Emerson	Tel:  +44 (0) 1483 413500
Stanford Capital Partners Ltd (Broker) Patrick Claridge/Bob Pountney	Tel:  +44 (0) 203 3650 3650/51
Fortified Securities Guy Wheatley	Tel: +44 (0) 203 4117773
Brand Communications (Public & Investor Relations) Alan Green	Tel: +44 (0) 7976 431608

Overview of M3 Helium

Mendell Helium announced on 27 June 2024 that it has entered into an option agreement to acquire the entire issued share capital of M3 Helium through the issue of 57,611,552 new ordinary shares in Mendell Helium to M3 Helium's shareholders.  The exercise of the option will constitute a reverse takeover pursuant to AQSE Rule 3.6 of the Access Rule Book and is subject to, inter alia, publication of an admission document.

M3 Helium's flagship well, Rost 1-26, is in Fort Dodge, just to the east of Dodge City, Kansas.  It has been tested as containing 5.1% helium composition and a drill stem test yielded a maximum flow rate of approximately 2,900 Mcf per day.  M3 Helium owns a mobile Pressure Swing Adsorption production plant which has been installed on site and will be used to purify the produced helium.  The plant is capable of processing up to 800 Mcf per day of raw gas and purifying it up to 99.999% helium although management believes on-site purification to around 75% will be more practical.

Water removed from Rost 1-26 is delivered to Brobee, a nearby disposal well that has been permitted at 5,000 barrels of water per day at 1,200 psi.

Production at Rost 1-26 commenced in early November 2025.

M3 Helium also has interests in five producing wells (Peyton, Smith, Nilson, Bearman and Demmit) within the Hugoton gas field in South-Western Kansas, one of the largest natural gas fields in North America.  Significantly these wells are in the proximity of a gathering network and the Jayhawk gas processing plant meaning that producing wells are all tied into the infrastructure.

M3 Helium is also developing a Bitcoin mining operation in Nebraska where it has taken a lease of land prospective for biogenic methane and has drilled a pilot well (Jasper).  It is onboarded for custody with Bitgo Inc. and its Bitcoin treasury management policy is available at https://mendellhelium.com/bitcoin-treasury.

1

Details of the persons discharging managerial responsibilities / person closely associated

a)

Name

Nick Tulloch

2

Reason for the notification

a)

Position/Status

Chief Executive Officer

b)

Initial notification/ Amendment

Initial

3

Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor

a)

Name

Mendell Helium plc

b)

LEI

213800XIUQ3AHRZ6UF89

4

Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted

a)

Description of the financial

instrument, type of

instrument

Identification code

Ordinary shares of 1 pence each

GB00BLD3FF28

b)

Nature of the transaction

Acquisition of warrants over new ordinary shares

c)

Price(s) and volume(s)

Price(s)	Volume(s)
6 pence	1,318,617
3 pence	7,364,500

d)

Aggregated information

-      Aggregated volume

-      Price

N/A

e)

Date of transaction

10 November 2025

f)

Place of transaction

AQSE

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