Menhaden Resource Efficiency PLC - Holding(s) in Company

TR-1: Standard form for notification of major holdings

1. Issuer Details

ISIN

GB00BZ0XWD04

Issuer Name

MENHADEN RESOURCE EFFICIENCY PLC

UK or Non-UK Issuer

2. Reason for Notification

An acquisition or disposal of voting rights

3. Details of person subject to the notification obligation

Name

First Equity Limited

City of registered office (if applicable)

London

Country of registered office (if applicable)

United Kingdom

Name City of registered office Country of registered office Estate of William Black Rath Dhu Limited Douglas Isle of Man Armstrong Investments Limited Douglas Isle of Man

4. Details of the shareholder

Name City of registered office Country of registered office Nortrust Nominees Limited London United Kingdom

5. Date on which the threshold was crossed or reached

20-Dec-2024

6. Date on which Issuer notified

23-Dec-2024

7. Total positions of person(s) subject to the notification obligation

. % of voting rights attached to shares (total of 8.A) % of voting rights through financial instruments (total of 8.B 1 + 8.B 2) Total of both in % (8.A + 8.B) Total number of voting rights held in issuer Resulting situation on the date on which threshold was crossed or reached 6.495401 0.000000 6.495401 5120000 Position of previous notification (if applicable) 7.675230 0.000000 7.675230

8. Notified details of the resulting situation on the date on which the threshold was crossed or reached

8A. Voting rights attached to shares

Class/Type of shares ISIN code(if possible) Number of direct voting rights (DTR5.1) Number of indirect voting rights (DTR5.2.1) % of direct voting rights (DTR5.1) % of indirect voting rights (DTR5.2.1) GB00BZ0XWD04 5120000 0 6.495401 0.000000 Sub Total 8.A 5120000 6.495401%

8B1. Financial Instruments according to (DTR5.3.1R.(1) (a))

Type of financial instrument Expiration date Exercise/conversion period Number of voting rights that may be acquired if the instrument is exercised/converted % of voting rights Sub Total 8.B1

8B2. Financial Instruments with similar economic effect according to (DTR5.3.1R.(1) (b))

Type of financial instrument Expiration date Exercise/conversion period Physical or cash settlement Number of voting rights % of voting rights Sub Total 8.B2

9. Information in relation to the person subject to the notification obligation

2. Full chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held starting with the ultimate controlling natural person or legal entities (please add additional rows as necessary)

Ultimate controlling person Name of controlled undertaking % of voting rights if it equals or is higher than the notifiable threshold % of voting rights through financial instruments if it equals or is higher than the notifiable threshold Total of both if it equals or is higher than the notifiable threshold William Black First Equity Limited as Investment Manager of Armstrong Inv Limited 4.567079 0.000000 4.567079% William Black Armstrong Investments Limited William Black First Equity Limited as Investment Manager of Rath Dhu 1.928322 0.000000 1.928322% William Black Rath Dhu Limited

10. In case of proxy voting

Name of the proxy holder

The number and % of voting rights held

The date until which the voting rights will be held

11. Additional Information

12. Date of Completion

23-Dec-2024

13. Place Of Completion

London