Appointment of Non-Executive Director

10-11 CHARTERHOUSE SQUARE, LONDON EC1M 6EE

TELEPHONE: +44 (0)20 7549 5700

27th 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 2nd 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:

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

LEI: 2138008OGI7VYG8FGR19