Issue of Shares & Total Voting Rights

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

13 November 2025

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ISSUE OF SHARES AND TOTAL VOTING RIGHTS

Diploma PLC (the "Company") announces that it has allotted and issued 141,191 new Ordinary Shares of 5p each in the capital of the Company (the "New Shares"). The New Shares have been allotted and issued to the Diploma PLC Employee Benefit Trust ("EBT") at the par value of 5p each, to satisfy future exercises of awards granted to beneficiaries under the 2020 Performance Share Plan.

The EBT now holds a total of 222,559 Ordinary Shares of 5p each in the capital of the Company, representing 0.17 per cent. of the issued share capital.

In relation to the above, applications have been made to the Financial Conduct Authority (the "FCA") for admission of the New Shares to the premium listing segment of the Official List of the FCA and to London Stock Exchange plc for admission to trading of the New Shares on its main market for listed securities (together, "Admission"). The Admission is expected to take place at 8.00 a.m. on Monday 17 November 2025.

Following admission of the New Shares, the Company will have 134,317,398 Ordinary Shares of 5p each in issue. There are no shares held in treasury. Therefore, following the Admission of the New Shares, the total number of voting rights in the Company will be 134,317,398 (the "Voting Rights Figure"). The Voting Rights Figure may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their voting rights interest, or a change to that interest, in the Company under the FCA's Disclosure Guidance and Transparency Rules.

For further information please contact:

LEI: 2138008OGI7VYG8FGR19