Holding(s) in Company

1. Identity of the issuer or the underlying issuerof existing shares to which voting rights areattached: ii

SERCO GROUP PLC

2 Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

X

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

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (please specify):

3. Full name of person(s) subject to thenotification obligation: iii

Invesco Limited

4. Full name of shareholder(s)  (if different from 3.):iv

5. Date of the transaction and date onwhich the threshold is crossed orreached: v

29 August 2013

6. Date on which issuer notified:

30 August 2013

7. Threshold(s) that is/are crossed orreached: vi, vii

13%

8. Notified details:

A: Voting rights attached to shares viii, ix

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights x

Direct

Direct xi

Indirect xii

Direct

Indirect

Ordinary 2p Shares

60,109,307

60,109,307

67,315,347

13.48%

GB0007973794

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate xiii

Exercise/Conversion Period xiv

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv, xvi

Resulting situation after the triggering transaction

Type of financialinstrument

Exercise price

Expiration date xvii

Exercise/Conversion period xviii

Number of voting rights instrument refers to

% of voting rights xix, xx

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

67,315,347

13.48%

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

Invesco Asset Management Ltd & Invesco GT Management - 20,469

Invesco Asset Management Japan Limited - 657,181

Invesco Asset Management Dublin - 166,465

Invesco Asset Management GmbH Deutschland - 40,441

Invesco Asset Management Limited - 20,644,011

Invesco Canada Ltd & Advisers Limited - 11,883

Invesco GT Management S.A - 20,469

Invesco PowerShares Capital Management LLC - 28,964

Invesco PowerShares Capital Management Ireland - 26,549

Invesco Fund Managers Limited - 45,719,384

Proxy Voting:

10. Name of the proxy holder:

11. Number of voting rights proxy holder will ceaseto hold:

12. Date on which proxy holder will cease to holdvoting rights:

13. Additional information:

Serco Group plc is disclosing this information in accordance with DTR 5.8.12

14. Contact name:

Sarah Howfield

15. Contact telephone number:

01256 744272