Mendell Helium announces that, further to its announcement of 17 November 2025, the Company is pleased to announce that it has raised, through the Subscription and an unsecured convertible loan note facility (“CLN”) with certain high net worth investors, aggregate gross proceeds of approximately £513,000.

Highlights

Fundraising

• A total of 7,102,320 new Ordinary Shares have been issued through the Subscription (all as previously announced) to raise approximately £213,000
• A further £300,000 of funding is available to the Company through the CLN, with the timing most likely linked to the next phase of expansion of M3 Helium Corporation’s (“M3 Helium”) Fort Dodge, Kansas projects
• The CLN, if converted before the Company is admitted to trading on AIM, entitles the holders to new Ordinary Shares at a price of 3 pence per share (further details are below)
• The CLN, if converted after the Company is admitted to trading on AIM, entitles the holders to new Ordinary Shares at a price of 4.5 pence per share (further details are below)

Operations

• Advanced discusssions with a group of US based investors who have expressed interest in supporting M3 Helium in drilling a new production well in the Fort Dodge region
• Agreement in principle with a local well owner to dewater and recomplete a currently disused well

As announced on 27 June 2024, the Company has an option (the “Option”) to acquire M3 Helium, a producer of helium which is based in Kansas and holds an interest in six producing wells.  There is no certainty that the Company’s option to acquire M3 Helium will be exercised, nor that the enlarged group will successfully complete a re-admission. As announced on 1 December 2025, the Company and M3 Helium have agreed to extend the date on which the Option should be exercised to 28 February 2026.

Subscription

Investments in the Subscription were announced on 17 and 25 November 2025 and 4 December 2025.  No further new Ordinary Shares have been issued pursuant to this announcement.

For every two new Ordinary Shares issued pursuant to the Subscription, investors have received one warrant allowing the holder to subscribe for an additional new Ordinary Share in the Company at an exercise price of 4.5 pence per Ordinary Share, exercisable within two years of Admission (as defined further below) and one warrant allowing the holder to subscribe for an additional new Ordinary Share in the Company at an exercise price of 6 pence per Ordinary Share, each exercisable within two years of Admission. In aggregate 7,102,320 warrants have been issued pursuant to the Subscription. The warrants will not be tradeable, nor transferable or CREST-enabled.

Investments in the Subscription were announced on 17 and 25 November 2025 and 4 December 2025.  No further new Ordinary Shares have been issued pursuant to this announcement.

No commissions are due under the Subscription as each subscriber made a direct investment in the Company.

Convertible Loan Note 

Further to the announcement on 4 December 2025, certain high net worth investors have agreed to provide £300,000 under the unsecured CLN in substitution of the Broker Option.  The advantage of this structure is that it secures funding for the Company at the likely time of the next phase of expansion of its Fort Dodge, Kansas projects but, unless the CLN is converted prior to the move to AIM (as described below) is a less dilutive structure for Mendell Helium’s shareholders.

Key terms of the CLN are detailed below:

• The CLN can be converted by the holders into new Ordinary shares at 3p up to the date of Mendell Helium’s proposed admission to trading on AIM
• The CLN can be converted by the holders into new Ordinary shares at 4.5p after the date of Mendell Helium’s proposed admission to trading on AIM
• If the CLN is converted then £300,000 (or pro rata) is payable to the Company at the time of conversion
• If the CLN is not converted, the Company agrees not to draw down on the CLN until the later of (i) admission to trading on AIM or (ii) 14 February 2026
• Following draw down, CLN carries a coupon of 10% payable half yearly or can at any time be converted into new Ordinary Shares at 4.5 pence per share
• A 5% fee will be payable in new Ordinary shares on draw down of the CLN
• The CLN will expire if it is neither converted nor drawn down by 30 April 2026
• The CLN is repayable in full (principal and interest) by the later of (i) second anniversary of admission to AIM or (ii) 14 February 2028
• The CLN will expire if it is neither converted nor drawn down by 30 April 2026

In consideration for providing the CLN, investors in the CLN will be issued, in aggregate, 10,000,000 warrants on the same terms as the Subscription as described above.

AlbR Capital Limited (“AlbR”) acted as the Company’s broker in connection with the CLN. The Company is pleased to announce that AlbR has been appointed as a Joint Broker to the Company with immediate effect.

Use of proceeds

On 17 November 2025, Mendell Helium announced that the success of M3 Helium’s Rost 1-26 well (“Rost”)  had generated interest from finance partners, nearby well owners and specialist engineers, all of whom have expressed interest in principle in working with M3 Helium to expand its operations in Fort Dodge, Kansas.  The Company is now pleased to provide the following update:

• Mendell Helium is in advanced discussions with a group of US based investors who have expressed interest in supporting M3 Helium in drilling a new production well in the Fort Dodge region.
• Mendell Helium has reached an agreement in principle with a local well owner to dewater and recomplete a currently disused well. This partnership would provide a faster route to expansion than drilling on a new site.
• The Company has also received recommendations from several firms of specialist engineers to enhance M3 Helium’s Fort Dodge operations by, amongst other things, purifying produced helium to a higher concentration and capturing produced NGLs for sale.

As previously announced, whilst there can be no guarantee that any of the above opportunities will be realised, given Rost has attracted so much attention in its early weeks of operation is an indication of both Rost’s and the region’s potential.

Mendell Helium intends to apply the proceeds of the Subscription and, in time, the CLN through issuing additional loans to M3 Helium to enable M3 Helium to further invest in its operations at Rost and to continue to investigate the opportunity for M3 Helium to expand its interests in the Fort Dodge area through additional producing wells.

At the date of this announcement Mendell has provided approximately US$1.3 million in loans to M3 Helium including accrued interest.

Nick Tulloch, Chief Executive Officer of Mendell Helium and Chairman of M3 Helium, said: “Our fundraising which began as an offer of new investment from one shareholder has closed with in excess of £0.5 million of new funds secured for Mendell Helium. The success of M3 Helium’s operations in Kansas and the prospects that its has created in the Fort Dodge region have attracted support from both existing shareholders and new investors – and significantly from industry partners in the US.  The convertible loan note structure has been employed as a creative mechanism that may delay access to funds until such time as M3 Helium requires them – namely for new wells in Fort Dodge – and, subject to the timing of conversion, may be less dilutive for existing holders than taking all the funds in now through the issue of new Ordinary Shares.

“M3 Helium’s Rost well is a complex dewatering and helium purification project.  In proving its success, as evidenced by commercial production of helium being underway, it is no surprise that there is now rising interest in working with M3 Helium on related projects.  Proceeds of the fundraising puts M3 Helium in a strong position to develop and, in time, conclude these discussions and, with that, secure the next phase of development at Fort Dodge.”

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 investors@mendellhelium.com
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
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