Appointment of Non-Executive Director

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Diploma PLC announced the appointment of Cheri Phyfer as an independent non-executive director, effective March 2, 2026, who will also join the Nomination and Remuneration Committees. Phyfer brings over three decades of experience, including seven years as Group President at Fortune Brands Innovations Inc. and various senior management roles at The Sherwin Williams Company, alongside current independent board memberships at BlueScope Steel Limited and O-I Glass Inc. The company stated there is no further information required for disclosure under UK Listing Rule 6.4.8R.

Disclaimer*

Diploma PLC

27 February 2026

10-11 CHARTERHOUSE SQUARE, LONDON EC1M 6EE

TELEPHONE: +44 (0)20 7549 5700

27^th February 2026

APPOINTMENT OF NON-EXECUTIVE DIRECTOR

Diploma PLC, the value-add solutions group, is pleased to announce the appointment of Cheri Phyfer as an independent non-executive director with effect from 2^nd March 2026. Cheri will join the Nomination Committee and the Remuneration Committee.

Cheri is currently an independent board member at BlueScope Steel Limited, O-I Glass Inc. and W.C. Bradley Co. Prior to this, Cheri gained over three decades of experience working in industry, as Group President at Fortune Brands Innovations Inc. for seven years and, prior to that, at The Sherwin Williams Company, where she held a number of senior management positions.

Cheri holds a Bachelor of Science degree in Management and an MBA, both from Clemson University, South Carolina.

David Lowden, Board Chair, commented:

"We are delighted to welcome Cheri to the Diploma Board. Cheri is a highly experienced business leader across US industrial, building materials and consumer products markets and her expertise and experience further strengthen our Board."

There is no other information that is required to be disclosed pursuant to UK Listing Rule 6.4.8R.

Anna Lawrence

Group General Counsel & Company Secretary

Diploma PLC

For further information, please contact:

Diploma PLC -

+44 (0)20 7549 5700

Anna Lawrence, General Counsel & Company Secretary

Holly Gillis, Head of Investor Relations

Further information on Diploma PLC can be found at www.diplomaplc.com

LEI: 2138008OGI7VYG8FGR19

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