<div id="readability-page-1"><div>RNS Number : 1364M Diploma PLC 18 December 2025 10-11 CHARTERHOUSE SQUARE, LONDON EC1M 6EETELEPHONE: +44 (0) 20 7549 570018 December 2025TR-1: Standard form for notification of major holdings1. Issuer DetailsISINGB0001826634Issuer NameDIPLOMA PLCUK or Non-UK IssuerUK2. Reason for NotificationAn acquisition or disposal of voting rights3. Details of person subject to the notification obligationNameNorges BankCity of registered office (if applicable)OsloCountry of registered office (if applicable)Norway4. Details of the shareholderFull name of shareholder(s) if different from the person(s) subject to the notification obligation, aboveCity of registered office (if applicable)Country of registered office (if applicable)5. Date on which the threshold was crossed or reached16-Dec-20256. Date on which Issuer notified17-Dec-20257. Total positions of person(s) subject to the notification obligation<div><table><tbody><tr><td></td><td>% of voting rights attached to shares (total of 8.A)</td><td>% of voting rights through financial instruments (total of 8.B 1 + 8.B 2)</td><td>Total of both in % (8.A + 8.B)</td><td>Total number of voting rights held in issuer</td></tr><tr><td>Resulting situation on the date on which threshold was crossed or reached</td><td>2.985710</td><td>0.000000</td><td>2.985710</td><td>4010331</td></tr><tr><td>Position of previous notification (if applicable)</td><td>3.007800</td><td>0.000000</td><td>3.007800</td><td></td></tr></tbody></table></div>8. Notified details of the resulting situation on the date on which the threshold was crossed or reached8A. Voting rights attached to shares<div><table><tbody><tr><td>Class/Type of shares ISIN code(if possible)</td><td>Number of direct voting rights (DTR5.1)</td><td>Number of indirect voting rights (DTR5.2.1)</td><td>% of direct voting rights (DTR5.1)</td><td>% of indirect voting rights (DTR5.2.1)</td></tr><tr><td>GB0001826634</td><td>4010331</td><td></td><td>2.985710</td><td></td></tr><tr><td>Sub Total 8.A</td><td colspan="2">4010331</td><td colspan="2">2.985710%</td></tr></tbody></table></div>8B1. Financial Instruments according to (DTR5.3.1R.(1) (a))<div><table><tbody><tr><td>Type of financial instrument</td><td>Sub Total 8.B1</td></tr><tr><td>Expiration date</td><td colspan="2"></td></tr><tr><td>Exercise/conversion period</td><td></td></tr><tr><td>Number of voting rights that may be acquired if the instrument is exercised/converted</td><td></td></tr><tr><td>% of voting rights</td></tr></tbody></table></div>8B2. Financial Instruments with similar economic effect according to (DTR5.3.1R.(1) (b))<div><table><tbody><tr><td>Type of financial instrument</td><td>Sub Total 8.B2</td></tr><tr><td>Expiration date</td><td colspan="3"></td></tr><tr><td>Exercise/conversion period</td><td></td></tr><tr><td>Physical or cash settlement</td><td></td></tr><tr><td>Number of voting rights</td></tr><tr><td>% of voting rights</td></tr></tbody></table></div>9. Information in relation to the person subject to the notification obligation1. Person subject to the notification obligation is not controlled by any natural person or legal entity and does not control any other undertaking(s) holding directly or indirectly an interest in the (underlying) issuer.<ul><li>Ultimate controlling person</li><li>Name of controlled undertaking</li><li>% of voting rights if it equals or is higher than the notifiable threshold</li><li>% of voting rights through financial instruments if it equals or is higher than the notifiable threshold</li><li>Total of both if it equals or is higher than the notifiable threshold</li></ul>10. In case of proxy votingName of the proxy holderThe number and % of voting rights heldThe date until which the voting rights will be held11. Additional Information12. Date of Completion17-Dec-202513. Place Of CompletionOslo, NorwayThis information is provided by RNS, the news service of the London Stock Exchange. RNS is approved by the Financial Conduct Authority to act as a Primary Information Provider in the United Kingdom. Terms and conditions relating to the use and distribution of this information may apply. For further information, please contact rns@lseg.com or visit www.rns.com.RNS may use your IP address to confirm compliance with the terms and conditions, to analyse how you engage with the information contained in this communication, and to share such analysis on an anonymised basis with others as part of our commercial services. For further information about how RNS and the London Stock Exchange use the personal data you provide us, please see our Privacy Policy. END HOLPKFBQKBDDFBD</div></div>

DPLM

Diploma PLC announced a change in major holdings, with Norges Bank crossing a threshold of 2.9857% voting rights as of December 16, 2025. The notification was completed on December 17, 2025, in Oslo, Norway. This information was provided by RNS, the news service of the London Stock Exchange.

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