Form of Proxy for 2026 AGM

MR A SAMPLE

000001

< DESIGNATION> SAMPLE STREET SAMPLE TOWN SAMPLE CITY SAMPLE COUNTY AA11 1AA

Bristol, BS99 6ZY

You will be asked to enter the Control Number, the Shareholder Reference Number (SRN) and PIN and agree to certain terms and conditions.

Control Number: 921422 SRN. C0000000000 PIN. 1245

View the 2025 Integrated Annual Report and Notice of Meeting online: www.metlen.com

1. Every holder has the right to appoint some other person(s) of their choice, who need not be a shareholder, as his proxy to exercise all or any of his rights, to attend, speak and vote on their behalf at the meeting. If you wish to appoint a person other than the Chairman, please insert the name of your chosen proxy holder in the space provided (see reverse). If the proxy is being appointed in relation to less than your full voting entitlement, please enter in the box next to the proxy holders name (see reverse) the number of shares in relation to which they are authorised to act as your proxy. If returned without an indication as to how the proxy shall vote on any particular matter, the proxy will exercise his discretion as to whether, and if so how, he votes (or if this proxy form has been issued in respect of a designated account for a shareholder, the proxy will exercise his discretion as to whether, and if so how, he votes).

2. To appoint more than one proxy, an additional proxy form(s) may be obtained by contacting the Registrar's helpline on 0370 707 1094 or you may photocopy this form. Please indicate in the box next to the proxy holder's name (see reverse) the number of shares in relation to which they are authorised to act as your proxy. Please also indicate by marking the box provided if the proxy instruction is one of multiple instructions being given. All forms must be signed and should be returned together in the same envelope.

   
   
   

3. The 'Vote Withheld' option overleaf is provided to enable you to abstain on any particular resolution. However, it should be noted that a 'Vote Withheld' is not a vote in law and will not be counted in the calculation of the proportion of the votes 'For' and 'Against' a resolution.

4. Pursuant to regulation 41 of the Uncertificated Securities Regulations 2001, entitlement to attend and vote at the meeting and the number of votes which may be cast thereat will be determined by reference to the Register of Members of the Company at close of business on the day which is two days before the day of the meeting. Changes to entries on the Register of Members after that time shall be disregarded in determining the rights of any person to attend and vote at the meeting.

5. To appoint one or more proxies or to give an instruction to a proxy (whether previously appointed or otherwise) via a designated voting platform, any such messages must be received by the issuer's agent prior to the specified deadline within the relevant system. For this purpose, the time of receipt will be taken to be the time (as determined by the timestamp generated by the relevant designated voting platform) from which the issuer's agent is able to retrieve the message. The Company may treat as invalid a proxy appointment sent via a designated voting platform in the circumstances set out in Regulation 35(5)(a) of the Uncertificated Securities Regulations 2001.

6. The above is how your address appears on the Register of Members. If this information is incorrect please ring the Registrar's helpline on 0370 707 1094 to request a change of address form or go to https://www.investorcentre.co.uk to use the online Investor Centre service.

7. Any alterations made to this form should be initialled.

8. The completion and return of this form will not preclude a member from attending the meeting and voting in person.

is specific to the unique

ot transferable between unts. The Company and ny instruction that does

MR A SAMPLE

< Designation> Additional Holder 1

Additional Holder 2

Additional Holder 3

Additional Holder 4

198390_254692_MAIL/000001/000001/SG601/i

C0000000000

I/We hereby appoint the Chairman of the Meeting OR the person indicated in the box above as my/our proxy to attend, speak and vote in respect of my/our full voting entitlement* on my/our behalf at the Annual General Meeting of Metlen Energy & Metals PLC to be held at 8 Artemidos Str., Maroussi, 151 25 Athens, Greece

on 21 May 2026 at 11.00 a.m. EEST (9.00 a.m. BST), and at any adjourned meeting.

* For the appointment of more than one proxy, please refer to Explanatory Note 2 (see front).

Please mark here to indicate that this proxy appointment is one of multiple appointments being made.

Vote

Please use a black pen. Mark with an X

inside the box as shown in this example.

Vote

1. To receive the Annual Report and Accounts of the Company for the year ended 31 December 2025 (2025 Integrated Annual Report)

   Withheld

   1. To elect Ms Konstantina Mavraki, serving as an Independent Non-Executive Director, as a Director of the Company

      For Against

      Withheld

2. To approve the Directors' Remuneration Report for the year ended 31 December 2025 (excluding the Remuneration Policy)

   1. To elect Ms Katherine Smith, serving as an Independent Non-Executive Director, as a Director of the Company

3. To approve the Director's Remuneration Policy

   1. To elect Ms Fiona Paulus, serving as an Independent Non-Executive Director, as a Director of the Company

4. To approve a final dividend of €1 per share

   1. To elect Mr Spiro Youakim, serving as an Independent Non-Executive Director, as a Director of the Company

5. To elect Mr Evangelos Mytilineos, serving as Executive Chairman, as a Director of the Company

   1. To re-appoint PricewaterhouseCoopers LLP and PricewaterhouseCoopers S.A. as Auditors of the Company

6. To elect Mr Christos Gavalas, serving as Group Chief Executive Officer, as a Director of the Company

   1. To authorise the Audit and Risk Committee to determine the remuneration of the Company's auditors

7. To elect Ms Fotini Ioannou, serving as Group Chief Financial Officer, as a Director of the Company

8. To elect Mr Ioannis Petrides, serving as Senior Independent Director, an Independent Non-Executive Director, as a Director of the Company

   1. To grant the Directors authority to allot shares

      Special Business

   2. To authorise the Directors to disapply pre-emption rights

9. To elect Dr Anthony Bartzokas, serving as an Independent Non-Executive Director, as a Director of the Company

   1. Additional power to disapply pre-emption rights for acquisitions or capital investments

10. To elect Mr Philippe Henry, serving as an Independent Non-Executive Director, as a Director of the Company

    1. Authority to make on-market purchases of own shares

11. To elect Ms Xenia Kazoli, serving as an Independent Non-Executive Director, as a Director of the Company

    1. Authority to make off-market purchases of own shares

12. To elect Mr Michael Kumar, serving as an Independent Non-Executive Director, as a Director of the Company

    1. That the period of notice required for general meetings of the Company (other than Annual General Meetings) shall be not less than 14 clear days' notice

13. To elect Mr Jamie Lowry, serving as a Non-Executive Director, as a Director of the Company.

I/We instruct my/our proxy as indicated on this form. Unless otherwise instructed the proxy may vote as he or she sees fit or abstain in relation to any business of the meeting.

In the case of a corporation, this proxy must be given under its

common seal or be signed on its behalf by an attorney or officer duly authorised, stating their capacity (e.g. director, secretary).

H 8 0 1 0 1 M E N