<div id="readability-page-1"><div>RNS Number : 0663I Diploma PLC 19 November 2025 10-11 CHARTERHOUSE SQUARE, LONDON EC1M 6EETELEPHONE: +44 (0) 20 7549 570019 November 2025Notification of transactions by persons discharging managerial responsibilities (PDMRs)Diploma PLC (the &#34;Company&#34;) has been notified that Johnny Thomson and Wilson Ng have exercised their share awards in the Company granted on 18 January 2023 and 28 November 2022 respectively, under the Diploma PLC 2020 Performance Share Plan (&#34;PSP&#34;). The net shares are required to be held until the fifth anniversary of the date of grant of the PSP awards.These awards vested after meeting performance conditions measured over a three-year period ended 30 September 2025. Further details relating to the performance conditions of these awards are set out in the Annual Report and Accounts FY25, which will be published in due course.The Notification of Dealing Form can be found below. This announcement is made in accordance with the UK Market Abuse Regulation.<div><table><tbody><tr><td>1</td><td colspan="2">Details of the Director/PDMR/PCA</td></tr><tr><td>a)</td><td>Name</td><td>1. Johnny Thomson2. Wilson Ng </td></tr><tr><td>2</td><td colspan="2">Reason for the notification</td></tr><tr><td>a)</td><td>Position/Status</td><td>1. Chief Executive Officer2. Acting Chief Financial Officer</td></tr><tr><td>b)</td><td>Initial notification/Amendment</td><td>Initial notification</td></tr><tr><td>3</td><td colspan="2">Details of the issuer</td></tr><tr><td>a)</td><td>Name</td><td>Diploma PLC</td></tr><tr><td>b)</td><td>LEI</td><td>2138008OGI7VYG8FGR19</td></tr><tr><td>4</td><td colspan="2">Details of the transactions:</td></tr><tr><td>a)</td><td>Description of the financial instrument, type of instrumentIdentification code</td><td>Ordinary shares of 5p each in the CompanyGB0001826634</td></tr><tr><td>b)</td><td>Nature of the transaction</td><td>Exercise of awards made under the Diploma Performance Share Plan</td></tr><tr><td>c)</td><td>Price(s) and volume(s)</td><td><div><table><tbody><tr><td></td><td>Price</td><td>Volume</td></tr><tr><td>1. </td><td>Nil cost</td><td>79,424</td></tr><tr><td>2. </td><td>Nil cost</td><td>9,433</td></tr></tbody></table></div></td></tr><tr><td>d)</td><td>Aggregated information- Aggregated volume- Price</td><td><div><table><tbody><tr><td></td><td>Price</td><td>Volume</td></tr><tr><td>1. </td><td>Nil cost</td><td>79,424</td></tr><tr><td>2. </td><td>Nil cost</td><td>9,433</td></tr></tbody></table></div></td></tr><tr><td>e)</td><td>Date of the transaction</td><td>18 November 2025</td></tr><tr><td>f)</td><td>Place of the transaction</td><td>Outside a trading venue</td></tr></tbody></table></div><div><table><tbody><tr><td>1</td><td colspan="2">Details of the Director/PDMR/PCA</td></tr><tr><td>a)</td><td>Name</td><td>1. Johnny Thomson2. Wilson Ng</td></tr><tr><td>2</td><td colspan="2">Reason for the notification</td></tr><tr><td>a)</td><td>Position/Status</td><td>1. Chief Executive Officer2. Acting Chief Financial Officer</td></tr><tr><td>b)</td><td>Initial notification/Amendment</td><td>Initial notification</td></tr><tr><td>3</td><td colspan="2">Details of the issuer</td></tr><tr><td>a)</td><td>Name</td><td>Diploma PLC</td></tr><tr><td>b)</td><td>LEI</td><td>2138008OGI7VYG8FGR19</td></tr><tr><td>4</td><td colspan="2">Details of the transactions</td></tr><tr><td>a)</td><td>Description of the financial instrument, type of instrumentIdentification code</td><td>Ordinary shares of 5p each in the CompanyGB0001826634</td></tr><tr><td>b)</td><td>Nature of the transaction</td><td>Sale of Shares to cover tax and national insurance</td></tr><tr><td>c)</td><td>Price(s) and volume(s)</td><td><div><table><tbody><tr><td></td><td>Price</td><td>Volume</td></tr><tr><td>1. </td><td>£52.59</td><td>37,407</td></tr><tr><td>2. </td><td>£52.59</td><td>4,446</td></tr></tbody></table></div></td></tr><tr><td>d)</td><td>Aggregated information- Aggregated volume- Price</td><td><div><table><tbody><tr><td></td><td>Price</td><td>Volume</td></tr><tr><td>1. </td><td>£52.59</td><td>37,407</td></tr><tr><td>2. </td><td>£52.59</td><td>4,446</td></tr></tbody></table></div></td></tr><tr><td>e)</td><td>Date of the transaction</td><td>18 November 2025</td></tr><tr><td>f)</td><td>Place of the transaction</td><td>Outside a trading venue</td></tr></tbody></table></div>For further information please contact:<div><table><tbody><tr><td>Diploma PLC</td><td>Tel: +44 (0) 20 7549 5700</td></tr><tr><td>Anna Lawrence, Group Company Secretary</td><td></td></tr></tbody></table></div>LEI: 2138008OGI7VYG8FGR19This information is provided by RNS, the news service of the London Stock Exchange. 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DPLM

Diploma PLC announced that CEO Johnny Thomson and Acting CFO Wilson Ng exercised their share awards under the 2020 Performance Share Plan. The shares, granted in 2023 and 2022, vested after meeting performance conditions over three years. They sold shares to cover tax and national insurance. The transactions occurred on 18 November 2025, outside a trading venue, at £52.59 per share. This announcement complies with UK Market Abuse Regulation.

REG - Diploma PLC - Director/PDMR Shareholding