Diploma PlcLSE: DPLM

Director Declaration

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      10-11 CHARTERHOUSE SQUARE,
 LONDON EC1M 6EE
TELEPHONE: +44 (0)20 7549 5700

7 October 2025

DIRECTOR DECLARATION - EXTERNAL APPOINTMENT

Diploma PLC announces that Johnny Thomson, Chief Executive Officer, has been appointed to a non-executive advisory role at TDR Capital LLP ("TDR") and will join the Strategic Committee of TDR's portfolio company, Applus+.

A Lawrence

Group General Counsel & Company Secretary

For further information please contact:

Diploma PLC -

+44 (0)20 7549 5700

Anna Lawrence, Group General Counsel & Company Secretary

LEI: 2138008OGI7VYG8FGR19