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                       
4. Full name of shareholder(s) (if       N/A                                   
different from 3):                                                              
5. Date of transaction (and date on      10 December 2012                      
which the                                                                      
threshold is crossed or reached if                                             
6. Date on which issuer notified:        11 December 2012                       
7. Threshold(s) that is/are crossed or   12%                                   
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       55,001,779 55,001,779           Direct   Indirect  Direct Indirect 
                                                 60,109,307         12.05%  
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                 



C: Financial Instruments with similar economic effect to Qualifying Financial  

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             
60,109,307                              12.05%                                  
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 - 19,201,834                                       
Invesco Asset Management Ltd & Invesco Advisers Inc. - 12,149                   
Invesco PowerShares Capital Management LLC - 37,801                             
Invesco Fund Managers Ltd - 40,596,738                                          
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         
15. Contact telephone name:         01256 744272                                
-0- Dec/11/2012 14:57 GMT
Press spacebar to pause and continue. Press esc to stop.