Director/PDMR Shareholding

DIPLOMA PLC

12 CHARTERHOUSE SQUARE, LONDON EC1M 6AX

TELEPHONE: +44 (0)20 7549 5700

FACSIMILE: +44 (0)20 7549 5715

FOR IMMEDIATE RELEASE

21 December 2020

DIPLOMA PLC - DIRECTOR'S INTEREST IN SHARES

Diploma PLC has been notified that on 18 December 2020, Johnny Thomson, Chief Executive Officer, acquired the beneficial interest in 2,690 Ordinary Shares in the Company at £21.09 per share and Barbara Gibbes, Chief Financial Officer, acquired the beneficial interest in 773 Ordinary Shares in the Company at £21.09 per share.

The shares were acquired with an amount equal to 50% of each executive directors' annual bonus, net of tax thereon, which was awarded for FY2020. These shares will be held by Sanne Fiduciary Services Limited on behalf of each executive director.

Following these transactions, the beneficial shareholding of each executive director is as follows:

The notification set out below has been made in accordance with Article 19 of the EU Market Abuse Regulation.