TR-1: Standard form for notification of major holdings

1. Issuer Details

ISIN

GB0004866223

Issuer Name

KELLER GROUP PLC

UK or Non-UK Issuer

UK

2. Reason for Notification

An acquisition or disposal of voting rights

3. Details of person subject to the notification obligation

Name

Dimensional Fund Advisors LP

City of registered office (if applicable)

Austin

Country of registered office (if applicable)

USA

4. Details of the shareholder

        Name                       City of registered office Country of registered
                                                     office

Funds and accounts managed
by Dimensional Fund
Advisors LP and/or its
subsidiary undertakings

5. Date on which the threshold was crossed or reached

10-Jul-2025

6. Date on which Issuer notified

14-Jul-2025

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

                                % of voting
                % of voting     rights through                   Total number of
.               rights attached financial       Total of both in voting rights
                to shares       instruments     % (8.A + 8.B)    held in issuer
                (total of 8.A)  (total of 8.B 1
                                + 8.B 2)

Resulting
situation on
the date on     5.003855        0.000000        5.003855         3567147
which threshold
was crossed or
reached

Position of
previous        4.992566        0.000000        4.992566
notification
(if applicable)

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    Number of direct Number of         % of direct   % of indirect
shares ISIN code voting rights    indirect voting   voting rights voting rights
(if possible)    (DTR5.1)         rights (DTR5.2.1) (DTR5.1)      (DTR5.2.1)

GB0004866223                      3567147                         5.003855

Sub Total 8.A    3567147                            5.003855%

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

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

Sub Total 8.B1

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

Type of    Expiration Exercise/conversion Physical or Number of     % of voting
financial  date       period              cash        voting rights rights
instrument                                settlement

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)

                                               % of voting
                               % of voting     rights through  Total of both if
Ultimate      Name of          rights if it    financial       it equals or is
controlling   controlled       equals or is    instruments if  higher than the
person        undertaking      higher than the it equals or is notifiable
                               notifiable      higher than the threshold
                               threshold       notifiable
                                               threshold

              i) Dimensional
              Fund Advisors
              Ltd., (ii) DFA
              Australia
              Limited (iii)
              Dimensional
Dimensional   Ireland Limited
Holdings Inc. (iv) Dimensional
              Fund Advisors
              Canada ULC (v)
              Dimensional Fund
              Advisors Pte.
              Ltd. and (vi)
              Dimensional Fund
              Advisors LP

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

The ordinary shares are held in segregated accounts and funds (together, the “Accounts”) managed on a discretionary basis by Dimensional Fund Advisors LP ("Dimensional") and its subsidiary undertakings i) Dimensional Fund Advisors Ltd., (ii) DFA Australia Limited (iii) Dimensional Ireland Limited (iv) Dimensional Fund Advisors Canada ULC (v) Dimensional Fund Advisors Pte. Ltd. and (vi) Dimensional Fund Advisors LP.

As at 10 July 2025, Dimensional also had investment management discretion over an additional 5,519 shares where the voting rights are not controlled by Dimensional or its subsidiary undertakings.

Dimensional is controlled by its general partner, Dimensional Holdings Inc.

Dimensional, on behalf of itself and its subsidiary undertakings, expressly disclaims beneficial ownership of the shares held in the Accounts.

12. Date of Completion

14-Jul-2025

13. Place Of Completion

Paris

CONTACT:

Enquiries:

Jamie Dearsley

Company Secretarial Assistant

+44 204 557 2019

Keller Group Plc

LEI Number:         549300QO4MBL43UHSN10

Classification:        2.3 (Major shareholding notifications)