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 group of companies                                         
                                                                               
4    Full name of shareholder(s) (if different from 3.):                       
                                                                               
     PRUCLT HSBC GIS NOM (UK) PPL AC     828,620                                  
     NORTRUST NOMINEE LTD A/C MEJ01    3,141,331                                 
     NORTRUST NOMS LTD                   303,955                                                 
     M&G GLOBAL DIVIDEND FUND            124,000                                          
     NORTRUST NOMINEE LTD A/C PUC01       57,218                                     
     HSBC SEOUL GL BASICS MOTHER FD        1,001                                      
     NORTRUST NOMINEE LTD A/C PUS01        9,108                                      
     STATE STREET NOMS                    12,858                                                  
     JNL/M&G GLOBAL BASICS FUND           64,776                                         
     PRUCLT HSBC GIS NOM (UK) PAC AC   2,212,470                                 
     NORTRUST NOMINEE LTD A/C MKK01    3,750,000                                 
     NORTRUST NOMS LTD A/C PUE01             600                                           
     NORTRUST NOMINEE LTD A/C MVB01       76,714                                    
     NORTRUST NOMINEE LTD A/C MHF01       48,941                                     
     NORTRUST NOMINEE LTD A/C MVA01       88,358                                     
     PTF                                  29,296                                                                
                                                                               
5    Date of the transaction (and date on which the threshold is crossed or    
     reached if different):                                                    
                                                                               
     26 August 2010                                                            
                                                                               
6    Date on which issuer notified:                                            
                                                                               
     27 August 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: 10,849,246                                              
     Number of voting rights: 10,849,246                                       
                                                                               
     Resulting situation after the triggering transaction:                     
     Number of shares (direct): 10,749,246                                     
     Number of voting rights (direct): 10,642,316                              
     Number of voting rights (indirect): 106,930                               
     % of voting rights (direct): 4.95%                                        
     % of voting rights (indirect): 0.05%                                      
     Total voting rights: 10,749,246 (5.00%)                                   
                                                                               
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), M&G Limited
     (wholly owned subsidiary of M&G Group Limited) and M&G Investment         
     Management Limited (wholly owned subsidiary of M&G 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