HBR 2026-02-16 investegate

Holding(s) in Company

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Letterone Investment Holdings S.A. has notified Harbour Energy PLC of a change in its major holding, with its total voting rights decreasing from 4.000150% to 3.600919%, representing 56,884,589 voting rights. This reduction is due to an acquisition by the issuer that was partially financed through the issuance of shares. The notification was made on February 13, 2026, following the threshold crossing on February 12, 2026.

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Harbour Energy PLC

16 February 2026

TR-1: Standard form for notification of major holdings

1. Issuer Details

ISIN

GB00BMBVGQ36

Issuer Name

HARBOUR ENERGY PLC

UK or Non-UK Issuer

2. Reason for Notification

Other

Comments

Acquisition by Issuer partially financed through issuance of shares

3. Details of person subject to the notification obligation

Name

Letterone Investment Holdings S.A.

City of registered office (if applicable)

Luxembourg

Country of registered office (if applicable)

Luxembourg

4. Details of the shareholder

Name

City of registered office

Country of registered office

Letterone Treasury Services S.A.

Strassen

Luxembourg

5. Date on which the threshold was crossed or reached

12-Feb-2026

6. Date on which Issuer notified

13-Feb-2026

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

3.600919

0.000000

3.600919

56884589

Position of previous notification (if applicable)

4.000150

0.000000

4.000150

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)

GB00BMBVGQ36

56884589

3.600919

0.000000

Sub Total 8.A

56884589

3.600919%

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

Letterone Investment Holdings S.A.

L1TS (Cyprus) Limited

Letterone Treasury Services S.A.

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

Please note, the total amount of voting rights have been rounded to 6 decimal places therefore there is a possibility of a rounding error.

12. Date of Completion

13-Feb-2026

13. Place Of Completion

London

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