<div id="readability-page-1">1. Issuer Details2. Reason for Notification3. Details of person subject to the notification obligationBlackRock, Inc.4. Details of the shareholderFull name of shareholder(s) if different from the person(s) subject to the notification obligation, above5. Date on which the threshold was crossed or reached6. Date on which Issuer notified7. Total positions of person(s) subject to the notification obligation8. Notified details of the resulting situation on the date on which the threshold was crossed or reached8A. Voting rights attached to shares8B1. Financial Instruments according to (DTR5.3.1R.(1) (a))8B2. Financial Instruments with similar economic effect according to (DTR5.3.1R.(1) (b))9. Information in relation to the person subject to the notification obligation2. Full chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held starting with the ultimate controlling natural person or legal entities (please add additional rows as necessary)<div><table><tbody><tr><td>Ultimate controlling person</td><td>Name of controlled undertaking</td><td>% of voting rights if it equals or is higher than the notifiable threshold</td><td>% of voting rights through financial instruments if it equals or is higher than the notifiable threshold</td><td>Total of both if it equals or is higher than the notifiable threshold</td></tr><tr><td>BlackRock, Inc. (Chain 1)</td><td>BlackRock Saturn Subco, LLC</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 1)</td><td>BlackRock Finance, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 1)</td><td>BlackRock Holdco 2, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 1)</td><td>BlackRock Financial Management, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 1)</td><td>BlackRock International Holdings, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 1)</td><td>BR Jersey International Holdings L.P.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 1)</td><td>BlackRock Holdco 3, LLC</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 1)</td><td>BlackRock Cayman 1 LP</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 1)</td><td>BlackRock Cayman West Bay Finco Limited</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 1)</td><td>BlackRock Cayman West Bay IV Limited</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 1)</td><td>BlackRock Group Limited</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 1)</td><td>BlackRock Investment Management (UK) Limited</td><td>4.980000</td><td>0.320000</td><td>5.310000%</td></tr><tr><td>BlackRock, Inc. (Chain 2)</td><td>BlackRock Saturn Subco, LLC</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 2)</td><td>BlackRock Finance, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 2)</td><td>BlackRock Holdco 2, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 2)</td><td>BlackRock Financial Management, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 2)</td><td>BlackRock International Holdings, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 2)</td><td>BR Jersey International Holdings L.P.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 2)</td><td>BlackRock Australia Holdco Pty. Ltd.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 2)</td><td>BlackRock Investment Management (Australia) Limited</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 3)</td><td>BlackRock Saturn Subco, LLC</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 3)</td><td>BlackRock Finance, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 3)</td><td>BlackRock Holdco 2, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 3)</td><td>BlackRock Financial Management, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 3)</td><td>BlackRock Holdco 4, LLC</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 3)</td><td>BlackRock Holdco 6, LLC</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 3)</td><td>BlackRock Delaware Holdings Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 3)</td><td>BlackRock Institutional Trust Company, National Association</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 4)</td><td>BlackRock Saturn Subco, LLC</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 4)</td><td>BlackRock Finance, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 4)</td><td>BlackRock Holdco 2, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 4)</td><td>BlackRock Financial Management, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 4)</td><td>BlackRock Holdco 4, LLC</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 4)</td><td>BlackRock Holdco 6, LLC</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 4)</td><td>BlackRock Delaware Holdings Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 4)</td><td>BlackRock Fund Advisors</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 5)</td><td>BlackRock Saturn Subco, LLC</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 5)</td><td>BlackRock Finance, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 5)</td><td>BlackRock Holdco 2, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 5)</td><td>BlackRock Financial Management, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 6)</td><td>BlackRock Saturn Subco, LLC</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 6)</td><td>BlackRock Finance, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 6)</td><td>BlackRock Holdco 2, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 6)</td><td>BlackRock Financial Management, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 6)</td><td>BlackRock International Holdings, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 6)</td><td>BR Jersey International Holdings L.P.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 6)</td><td>BlackRock Holdco 3, LLC</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 6)</td><td>BlackRock Cayman 1 LP</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 6)</td><td>BlackRock Cayman West Bay Finco Limited</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 6)</td><td>BlackRock Cayman West Bay IV Limited</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 6)</td><td>BlackRock Group Limited</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 6)</td><td>BlackRock (Netherlands) B.V.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 6)</td><td>BlackRock Asset Management Deutschland AG</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 7)</td><td>BlackRock Saturn Subco, LLC</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 7)</td><td>BlackRock Finance, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 7)</td><td>BlackRock Holdco 2, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 7)</td><td>BlackRock Financial Management, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 7)</td><td>BlackRock International Holdings, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 7)</td><td>BlackRock Canada Holdings ULC</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 7)</td><td>BlackRock Asset Management Canada Limited</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 8)</td><td>BlackRock Saturn Subco, LLC</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 8)</td><td>BlackRock Finance, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 8)</td><td>BlackRock Holdco 2, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 8)</td><td>BlackRock Financial Management, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 8)</td><td>BlackRock Capital Holdings, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 8)</td><td>BlackRock Advisors, LLC</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 9)</td><td>BlackRock Saturn Subco, LLC</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 9)</td><td>BlackRock Finance, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 9)</td><td>BlackRock Holdco 2, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 9)</td><td>BlackRock Financial Management, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 9)</td><td>BlackRock International Holdings, Inc.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 9)</td><td>BR Jersey International Holdings L.P.</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 9)</td><td>BlackRock Holdco 3, LLC</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 9)</td><td>BlackRock Cayman 1 LP</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 9)</td><td>BlackRock Cayman West Bay Finco Limited</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 9)</td><td>BlackRock Cayman West Bay IV Limited</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 9)</td><td>BlackRock Group Limited</td><td></td><td></td><td></td></tr><tr><td>BlackRock, Inc. (Chain 9)</td><td>BlackRock Advisors (UK) Limited</td><td></td><td></td><td></td></tr></tbody></table></div>10. In case of proxy voting11. Additional Information12. Date of Completion13. Place Of Completion12 Throgmorton Avenue, London, EC2N 2DL, U.K.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 HOLBRGDDRDGDGLC</div>

Serco Group PLC has received a notification regarding significant shareholding changes from BlackRock, Inc. The notification details the voting rights and financial instruments held by BlackRock and its controlled undertakings. The report outlines the total positions and the percentage of voting rights that have crossed the notifiable threshold. The completion date of this notification is noted as well as the place of completion in London, U.K.

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