Keller Group Plc - Holding(s) in Company

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 financial instruments

3. Details of person subject to the notification obligation

Name

BlackRock, Inc.

City of registered office (if applicable)

Wilmington

Country of registered office (if applicable)

USA

4. Details of the shareholder

Full name of shareholder(s) if different from the person(s) subject to the notification obligation, above

City of registered office (if applicable)

Country of registered office (if applicable)

5. Date on which the threshold was crossed or reached

20-May-2026

6. Date on which Issuer notified

22-May-2026

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


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

  Resulting
situation on
the date on       3.910000      1.090000         5.000000         3,509,097
which threshold
was crossed or
reached

  Position of
previous          Below 5%        Below 5%         Below 5%
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      Number of       Number of       % of direct      % of
of shares ISIN  direct voting   indirect voting voting rights    indirect voting
code(if         rights (DTR5.1) rights          (DTR5.1)         rights
possible)                       (DTR5.2.1)                       (DTR5.2.1)

  GB0004866223                    2,741,367                        3.910000

     Sub Total       2,741,367                       3.910000
8.A



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


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

  Securities                                    11,700              0.020000
Lending

     Sub Total                                     11,700              0.020000
8.B1



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


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

  CFD                                         Cash        756,030      1.070000

     Sub                                                     756,030
Total 8.B2                                                           1.070000



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

  BlackRock,     BlackRock
Inc. (Chain 1) Saturn Subco,
               LLC

  BlackRock,     BlackRock
Inc. (Chain 1) Finance, Inc.BlackRock,     Trident
Inc. (Chain 1) Merger, LLC

  BlackRock,     BlackRock
Inc. (Chain 1) Investment
               Management, LLC

  BlackRock,     BlackRock
Inc. (Chain 2) Saturn Subco,
               LLC

  BlackRock,     BlackRock
Inc. (Chain 2) Finance, Inc.

  BlackRock,     BlackRock
Inc. (Chain 2) Holdco 2, Inc.

                 BlackRock
  BlackRock,   Financial
Inc. (Chain 2) Management,
               Inc.

  BlackRock,     BlackRock
Inc. (Chain 2) International
               Holdings, Inc.

  BlackRock,     BR Jersey
Inc. (Chain 2) International
               Holdings L.P.

  BlackRock,     BlackRock
Inc. (Chain 2) Holdco 3, LLC

  BlackRock,     BlackRock
Inc. (Chain 2) Cayman 1 LP

  BlackRock,     BlackRock
Inc. (Chain 2) Cayman West Bay
               Finco Limited

  BlackRock,     BlackRock
Inc. (Chain 2) Cayman West Bay
               IV Limited

  BlackRock,     BlackRock
Inc. (Chain 2) Group Limited

                 BlackRock
  BlackRock,   Investment
Inc. (Chain 2) Management (UK)
               Limited

  BlackRock,     BlackRock
Inc. (Chain 3) Saturn Subco,
               LLC

  BlackRock,     BlackRock
Inc. (Chain 3) Finance, Inc.

  BlackRock,     BlackRock
Inc. (Chain 3) Holdco 2, Inc.

                 BlackRock
  BlackRock,   Financial
Inc. (Chain 3) Management,
               Inc.

  BlackRock,     BlackRock
Inc. (Chain 3) International
               Holdings, Inc.

  BlackRock,     BR Jersey
Inc. (Chain 3) International
               Holdings L.P.

                 BlackRock
  BlackRock,   Australia
Inc. (Chain 3) Holdco Pty.
               Ltd.

                 BlackRock
  BlackRock,   Investment
Inc. (Chain 3) Management
               (Australia)
               Limited

  BlackRock,     BlackRock
Inc. (Chain 4) Saturn Subco,
               LLC

  BlackRock,     BlackRock
Inc. (Chain 4) Finance, Inc.

  BlackRock,     BlackRock
Inc. (Chain 4) Holdco 2, Inc.

                 BlackRock
  BlackRock,   Financial
Inc. (Chain 4) Management,
               Inc.

  BlackRock,     BlackRock
Inc. (Chain 4) Holdco 4, LLC

  BlackRock,     BlackRock
Inc. (Chain 4) Holdco 6, LLC

  BlackRock,     BlackRock
Inc. (Chain 4) Delaware
               Holdings Inc.

                 BlackRock
  BlackRock,   Institutional
Inc. (Chain 4) Trust Company,
               National
               Association

  BlackRock,     BlackRock
Inc. (Chain 5) Saturn Subco,
               LLC

  BlackRock,     BlackRock
Inc. (Chain 5) Finance, Inc.

  BlackRock,     BlackRock
Inc. (Chain 5) Holdco 2, Inc.

                 BlackRock
  BlackRock,   Financial
Inc. (Chain 5) Management,
               Inc.

  BlackRock,     BlackRock
Inc. (Chain 5) Holdco 4, LLC

  BlackRock,     BlackRock
Inc. (Chain 5) Holdco 6, LLC

  BlackRock,     BlackRock
Inc. (Chain 5) Delaware
               Holdings Inc.

  BlackRock,     BlackRock
Inc. (Chain 5) Fund Advisors

  BlackRock,     BlackRock
Inc. (Chain 6) Saturn Subco,
               LLC

  BlackRock,     BlackRock
Inc. (Chain 6) Finance, Inc.

  BlackRock,     BlackRock
Inc. (Chain 6) Holdco 2, Inc.

                 BlackRock
  BlackRock,   Financial
Inc. (Chain 6) Management,
               Inc.

  BlackRock,     BlackRock
Inc. (Chain 7) Saturn Subco,
               LLC

  BlackRock,     BlackRock
Inc. (Chain 7) Finance, Inc.

  BlackRock,     BlackRock
Inc. (Chain 7) Holdco 2, Inc.

                 BlackRock
  BlackRock,   Financial
Inc. (Chain 7) Management,
               Inc.

  BlackRock,     BlackRock
Inc. (Chain 7) International
               Holdings, Inc.

  BlackRock,     BlackRock
Inc. (Chain 7) Canada Holdings
               ULC

                 BlackRock
  BlackRock,   Asset
Inc. (Chain 7) Management
               Canada Limited

  BlackRock,     BlackRock
Inc. (Chain 8) Saturn Subco,
               LLC

  BlackRock,     BlackRock
Inc. (Chain 8) Finance, Inc.

  BlackRock,     BlackRock
Inc. (Chain 8) Holdco 2, Inc.

                 BlackRock
  BlackRock,   Financial
Inc. (Chain 8) Management,
               Inc.

  BlackRock,     BlackRock
Inc. (Chain 8) Capital
               Holdings, Inc.

  BlackRock,     BlackRock
Inc. (Chain 8) Advisors, LLC

  BlackRock,     BlackRock
Inc. (Chain 9) Saturn Subco,
               LLC

  BlackRock,     BlackRock
Inc. (Chain 9) Finance, Inc.

  BlackRock,     BlackRock
Inc. (Chain 9) Holdco 2, Inc.

                 BlackRock
  BlackRock,   Financial
Inc. (Chain 9) Management,
               Inc.

  BlackRock,     BlackRock
Inc. (Chain 9) International
               Holdings, Inc.

  BlackRock,     BR Jersey
Inc. (Chain 9) International
               Holdings L.P.

  BlackRock,     BlackRock
Inc. (Chain 9) Holdco 3, LLC

  BlackRock,     BlackRock
Inc. (Chain 9) Cayman 1 LP

  BlackRock,     BlackRock
Inc. (Chain 9) Cayman West Bay
               Finco Limited

  BlackRock,     BlackRock
Inc. (Chain 9) Cayman West Bay
               IV Limited

  BlackRock,     BlackRock
Inc. (Chain 9) Group Limited

  BlackRock,     BlackRock
Inc. (Chain 9) Advisors (UK)
               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

BlackRock Regulatory Threshold Reporting Team

Jana Blumenstein

020 7743 365

12. Date of Completion

22 May 2026

13. Place Of Completion

12 Throgmorton Avenue, London, EC2N 2DL, U.K.

CONTACT:

Enquiries:

Jamie Dearsley

Assistant Company Secretary

+44 7824 584 151

Keller Group plc


LEI Number:         549300QO4MBL43UHSN10