Issue of Equity, TVR & Director Dealing

Mendell Helium PLC

24 August 2026

Mendell Helium plc

("Mendell Helium" or the "Company")

Issue of Equity, Total Voting Rights & Director Dealing

Mendell Helium (LON: MDH), the helium production company with operations in Kansas, announces that, in accordance with his share-based remuneration arrangements announced on 23 June 2025, Nick Tulloch, Chief Executive Officer, will receive 562,500 new Ordinary Shares ("New Shares"), as payment in lieu of £22,500 of accrued remuneration for the period from 1 April 2026 to 30 June 2026. Mr Tulloch will receive a further 1,500,000 new Ordinary Shares ("New Shares"), as payment of a £60,000 bonus following admission of the Company's ordinary shares to trading on AIM in June 2026.  The New Shares will be issued at a price of 4.0 pence per share, being a price equal to the issue price of the Company's fundraising announced on 30 April 2026. 

Following this issuance, the total number of Ordinary Shares that will be held following Admission by Nick Tulloch, a Person Discharging Managerial Responsibility ("PDMR"), is as follows:

Name	New Ordinary Shares to be issued	Total Ordinary Shares held in the Company following Admission	Percentage of the Company's enlarged issued ordinary share capital following Admission
Nick Tulloch	2,062,500	8,386,4831	2.43%

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

Additional Issue of Equity

The Company has agreed to issue and allot 1,087,500 new Ordinary Shares ("New Shares") as payment in lieu of approximately £43,500 of accrued fees owed by the Company to professional advisers. The majority of these accrued fees represent investor relations support in the period from 2024 through to 2027. These New Shares will be issued at the same price of 4.0 pence per share, being a price equal to the issue price of the Company's fundraising announced on 30 April 2026.

Admission

Application will be made for the 3,150,000 new Ordinary Shares to be admitted to trading on AIM ("Admission"). Admission is expected to occur at 8:00 am on or around 27 August 2026. The New Shares will rank pari passu with the existing ordinary shares.

Total Voting Rights

Following Admission, the Company's enlarged share capital will comprise 345,036,938 ordinary shares of 1 pence each. Therefore, the total number of voting rights in the Company will be 345,036,938. This figure may be used by shareholders as the denominator for calculations by which they will determine if they are required to notify their interest in the Company, or a change to their interest in the Company, under the Financial Conduct Authority's Disclosure Guidance and Transparency Rules.

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 videosummaries and seeing what other shareholders have to say. Navigate to our Interactive Investorwebsite here: https://mendellhelium.com/link/PKa6Ve

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 investors@mendellhelium.com
Cairn Financial Advisers LLP (Nominated Adviser) Ludovico Lazzaretti / Liam Murray	Tel:  +44 (0) 20 7213 0880
SI Capital Limited (Broker) Nick Emerson	Tel:  +44 (0) 1483 413500
Fortified Securities Guy Wheatley	Tel: +44 (0) 203 4117773
OAK Securities Jerry Keen / Calvin Man	Tel:  +44 (0) 20 3973 3678
AlbR Capital Limited Gavin Burnell / Colin Rowbury / Jon Belliss	Tel: +44 (0) 207 4690930
Brand Communications (Public & Investor Relations) Alan Green	Tel: +44 (0) 7976 431608

Overview of Mendell Helium

Mendell Helium is a helium producer in Kansas, USA where it operates through its wholly owned subsidiary M3 Helium.

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. Water removed from Rost 1-26 is delivered to Brobee, a nearby disposal well that has been permitted at 10,000 barrels of water per day at 1,200 psi.  Production at Rost 1-26 commenced in early November 2025 and the most recently recorded flow rate in December 2025 was 250 Mcf per day equating to approximately $1.4 million of helium per year (at $300/Mcf helium).

M3 Helium has subsequently drilled and completed a second well, Rost 2-26, which is currently being de-watered. It also owns additional leases in the Fort Dodge area capable of supporting up to eight new production wells. It has also agreed a joint venture with Ritchie Exploration, Inc. to recomplete the Schneweis Ventures 13A, a well with a drill stem test of over 10,000 Mcf per day and a historic flow rate of 300 Mcf per day.

At the Rost wells in Fort Dodge, M3 Helium treats the raw gas on site to concentrate the helium and has leased two tube trailers which it uses for deliveries to its offtaker.

M3 Helium also has interests in five producing wells (Peyton, Smith, Nilson, Bearman and Dimmitt) 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.

Forward Looking Statements

These forward-looking statements are not historical facts but rather are based on the Company's current expectations, estimates, and projections about its industry; its beliefs; and assumptions. Words such as 'anticipates,' 'expects,' 'intends,' 'plans,' 'believes,' 'seeks,' 'estimates,' and similar expressions are intended to identify forward-looking statements. These statements are not a guarantee of future performance and are subject to known and unknown risks, uncertainties, and other factors, some of which are beyond the Company's control, are difficult to predict, and could cause actual results to differ materially from those expressed or forecasted in the forward-looking statements. The Company cautions security holders and prospective security holders not to place undue reliance on these forward-looking statements, which reflect the view of the Company only as of the date of this announcement. The forward-looking statements made in this announcement relate only to events as of the date on which the statements are made. The Company will not undertake any obligation to release publicly any revisions or updates to these forward-looking statements to reflect events, circumstances, or unanticipated events occurring after the date of this announcement except as required by law or by any appropriate regulatory authority.

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	Issue of shares pursuant to director remuneration
c)	Price(s) and volume(s)	Price(s) Volume(s) 4.0 pence 2,062,500
d)	Aggregated information -      Aggregated volume -      Price	N/A
e)	Date of transaction	24 August 2026
f)	Place of transaction	AIM

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