Holding(s) in Company

NOTIFICATION OF MAJOR INTERESTS IN SHARES

1    Identity of the issuer or the underlying issuer of existing shares to     
     which voting rights are attached:                                         
                                                                               
     Johnson Matthey plc                                                       
                                                                               
2    Reason for the notification:                                              
                                                                               
     An acquisition or disposal of voting rights.                              
                                                                               
3    Full name of person(s) subject to the notification obligation:            
                                                                               
     Prudential plc                                                            
                                                                               
4    Full name of shareholder(s) (if different from 3.):                       
                                                                               
     REGISTERED HOLDER                           HOLDING     VOTING RIGHTS                                   
                                                                               
     Prudential plc, direct holding:                                           
                                                                               
     HSBC SEOUL GL BASICS MOTHER FD                  759               759                                    
     M&G GLOBAL DIVIDEND FUND                    278,817           278,817                                  
     NORTRUST NOMINEES LTD A/C MHF01              45,418            45,418                            
     NORTRUST NOMINEES LTD A/C MKK01           3,750,000         3,750,000                       
     NORTRUST NOMS LTD                           443,221           443,221                                         
     NORTRUST NOMS LTD A/C MEJ01               2,862,398         2,862,398                          
     NORTRUST NOMS LTD A/C MVA01                 123,810           123,810                               
     NORTRUST NOMS LTD A/C MVB01                  80,027            80,027                                 
     NORTRUST NOMS LTD A/C PUC01                  92,400            92,400                                 
     NORTRUST NOMS LTD A/C PUE01                     600               600                                       
     NORTRUST NOMS LTD A/C PUS01                   8,931             8,931                                   
     PRUCLT HSBC GIS NOM(UK) PAC AC            2,208,028         2,208,028                        
     PRUCLT HSBC GIS NOM(UK) PPL AC              758,205           758,205                            
     PTF                                          28,288            28,288

     Prudential plc, indirect holding:                                         
                                                                               
     JNL/M&G GLOBAL BASICS FUND                   64,776            64,776                                  
     STATE STREET NOMS                            12,858            12,858                                          
                                                                               
     TOTAL                                                      10,758,536 (5.01%)                                  
                                                                               
5    Date of the transaction (and date on which the threshold is crossed or    
     reached if different):                                                    
                                                                               
     22 November 2010                                                          
                                                                               
6    Date on which issuer notified:                                            
                                                                               
     23 November 2010                                                          
                                                                               
7    Threshold(s) that is/are crossed or reached:                              
                                                                               
     See item 13                                                               
                                                                               
8    Notified details:                                                         
                                                                               
     VOTING RIGHTS ATTACHED TO SHARES:                                         
                                                                               
     Class/type of shares (if possible using the ISIN CODE):                   
                                                                               
     GB0004764071                                                              
                                                                               
     Situation previous to the triggering transaction:                         
                                                                               
     Number of shares: 10,796,138                                              
                                                                               
     Number of voting rights: 10,796,138                                       
                                                                               
     Resulting situation after the triggering transaction:                     
                                                                               
     Number of shares (direct): 10,758,536                                     
                                                                               
     Number of voting rights (direct): 10,680,902                            
                                                                               
     Number of voting rights (indirect): 77,634                                
                                                                               
     % of voting rights (direct): 4.98%                                        
                                                                               
     % of voting rights (indirect): 0.03%                                      
                                                                               
     Total voting rights: 10,758,536 (5.01%)                                   
                                                                               
9    Chain of controlled undertakings through which the voting rights and/or   
     the financial instruments are effectively held if applicable:             
                                                                               
     Prudential plc (Parent Company)                                           
                                                                               
     PROXY VOTING:                                                             
                                                                               
10   Name of the proxy holder:                                                 
                                                                               
     N/A                                                                       
                                                                               
11   Number of voting rights proxy holder will cease to hold:                  
                                                                               
     N/A                                                                       
                                                                               
12   Date on which proxy holder will cease to hold voting rights:              
                                                                               
     N/A                                                                       
                                                                               
13   Additional Information                                                    
                                                                               
     M&G Group Limited (wholly owned subsidiary of Prudential plc) and M&G     
     Limited (wholly owned subsidiary of M&G Group Limited) no longer have a   
     notifiable interest - now "below 5%"                                      
                                                                               
14   Contact Name:                                                             
                                                                               
     Angela Purtill, Deputy Company Secretary, Johnson Matthey plc             
                                                                               
     Contact Telephone Number:                                                 
     020 7269 8461