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Holding(s) in Company

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Quantum Data Energy PLC announced that Peel Hunt LLP briefly became a major shareholder, crossing the 10% threshold on October 31, 2025. Peel Hunt LLP's holding reached 10.246828% of the voting rights, equating to 3,255,000 shares, up from a previous position of under 10%. However, Peel Hunt LLP subsequently disposed of voting rights, reducing its stake to below the 10% notifiable threshold on November 3, 2025. This rapid acquisition and subsequent reduction in a significant holding could influence investor perception.

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(Registration Number: 12886458)

Share code on the LSE: MAST

('Quantum Data' or 'the Company')

Dated: 4 November 2025

Quantum Data Energy PLC

TR-1: Standard form for notification of major holdings

Issuer Details

ISIN

GB00BNG90H86

Issuer Name

MAST ENERGY DEVELOPMENTS PLC

UK or Non-UK Issuer

UK

Reason for Notification

An acquisition or disposal of voting rights

Details of person subject to the notification obligation

Name

Peel Hunt LLP

City of registered office (if applicable)

London

Country of registered office (if applicable)

United Kingdom

Details of the shareholder

City of registered office (if applicable)

Country of registered office (if applicable)

Date on which the threshold was crossed or reached

31-Oct-2025

Date on which Issuer notified

03-Nov-2025

  • Total positions of person(s) subject to the notification obligation
Resulting situation on the date on which threshold was crossed or reached10.2468280.00000010.2468283255000
Position of previous notification (if applicable)Under 10%0.000000Under 10%
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)
GB00BNG90H863255000010.2468280.000000
Sub Total 8.A325500010.246828%

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

Sub Total 8.B1

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

Sub Total 8.B2

  • Information in relation to the person subject to the notification obligation
  • 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

  • Additional Information
  • Date of Completion

03-Nov-2025

Place Of Completion

London

TR-1: Standard form for notification of major holdings

Issuer Details

ISIN

GB00BNG90H86

Issuer Name

MAST ENERGY DEVELOPMENTS PLC

UK or Non-UK Issuer

UK

Reason for Notification

An acquisition or disposal of voting rights

Details of person subject to the notification obligation

Name

Peel Hunt LLP

City of registered office (if applicable)

London

Country of registered office (if applicable)

United Kingdom

Details of the shareholder

City of registered office (if applicable)

Country of registered office (if applicable)

Date on which the threshold was crossed or reached

03-Nov-2025

Date on which Issuer notified

04-Nov-2025

  • Total positions of person(s) subject to the notification obligation
Resulting situation on the date on which threshold was crossed or reachedBelow 10%0.000000Below 10%Below 10% of shares in issue
Position of previous notification (if applicable)10.2468280.00000010.246828
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)
GB00BNG90H86Below 10% of shares in issueBelow 10%
Sub Total 8.ABelow 10% of shares in issueBelow 10%

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

Sub Total 8.B1

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

Sub Total 8.B2

  • Information in relation to the person subject to the notification obligation
  • 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

  • Additional Information
  • Date of Completion

04-Nov-2025

Place Of Completion

London

Pieter Krügelinfo@med.energyMast Energy Developments PLCCEO
Guy Wheatley, CFA+44 (0)203 411 7773Fortified SecuritiesCorporate Broker

Cleaned text: letterheads, contacts and legal notices removed. View the original announcement ↗ · Company filings. Not investment advice.

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