SERCO GROUP PLC: Holding(s) in Company

For filings with the FSA include the annex For filings with issuer exclude the annex

TR-1: Notifications of Major Interests in Shares

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached:

Serco Group plc

2. Reason for notification [Yes/No]

An acquisition or disposal of voting rights Yes

An acquisition or disposal of financial instruments which may result in the acquisition of shares already issued to which voting rights are attached

An event changing the breakdown of voting rights

Other (please specify):

3. Full name of person(s) subject to Invesco Limited notification obligation:

4. Full name of shareholder(s) (if N/A different from 3):

5. Date of transaction (and date on 5 November 2012 which the threshold is crossed or reached if different):

6. Date on which issuer notified: 6 November 2012

7. Threshold(s) that is/are crossed or 10%, 11% reached:

8: Notified Details

A: Voting rights attached to shares

Class/type Situation previous to Resulting situation after of the triggering the triggering transaction shares transaction

If possible Number of Number of Number of Number of Percentage of use shares voting shares voting rights voting rights ISIN code rights

Ord 2p 49,961,897 49,961,897 Direct Indirect Direct Indirect

55,001,779 11.03%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of Expiration Exercise/ No. of voting Percentage of financial date conversion rights that may be voting rights instrument period/date acquired (if the

                                                  instrument                   
                                                  exercised/                   
                                                  converted)                   
                                                                               

NominalDelta

C: Financial Instruments with similar economic effect to Qualifying Financial  
Instruments                                                                    

Resulting situation after the triggering transaction

Type of Exercise Expiration Exercise/ Number of voting % of voting financial price date Conversion rights instrument rights instrument period refers to

Total (A+B+C)

Number of voting rights Percentage of voting rights

55,001,779 11.03%

9. Chain of controlled undertakings through which the voting rights and /or the financial instruments are effectively held, if applicable:

Invesco Canada Ltd & Invesco Advisers Inc - 14,048

Invesco Asset Management Deutschland GmbH - 40,441

Invesco Asset Management Dublin - 153,117

Invesco Asset Management Japan - 53,179

Invesco Asset Management Ltd - 19,037,272

Invesco Asset Management Ltd & Invesco Advisers Inc. - 12,149

Invesco PowerShares Capital Management LLC - 37,394

Invesco PowerShares Capital Management Ireland - 407

Invesco Fund Managers Ltd - 35,653,772

Proxy Voting:

10. Name of proxy holder: N/A

11. Number of voting rights proxy N/A holder will cease to hold:

12. Date on which proxy holder will N/A cease to hold voting rights:

13. Additional information: Serco Group plc is disclosing this

information in accordance with DTR 5.8.12

14 Contact name: Sarah Howfield, Company Secretarial

Assistant

15. Contact telephone name: 01256 744272

END

-0- Nov/09/2012 12:39 GMT