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.):                    
                                                                             
      HSBC SEOUL GL BASICS MOTHER FD       2,709                          
      JNL/M&G GLOBAL BASICS FUND           126,712                          
      M&G GLOBAL DIVIDEND FUND             95,300                         
      NORTRUST NOMINEE LTD A/C MHF01       48,941                         
      NORTRUST NOMINEE LTD A/C MKB01       183,994                        
      NORTRUST NOMINEE LTD A/C MKK01       3,750,000                      
      NORTRUST NOMS LTD                    290,610                      
      NORTRUST NOMINEE LTD A/C MEJ01       6,574,148                      
      NORTRUST NOMINEE LTD A/C MVA01       88,358                       
      NORTRUST NOMINEE LTD A/C MVB01       76,714                         
      NORTRUST NOMINEE LTD A/C PUC01       53,716                       
      NORTRUST NOMINEE LTD A/C PUS01       9,108                       
      PRUCLT HSBC GIS NOM (UK) PAC AC      2,263,445                     
      PRUCLT HSBC GIS NOM (UK) PPL AC      826,199                         
      PTF                                  29,296                         
      NORTRUST NOMS LTD A/C PUE01          600                          
      STATE STREET NOMS                    12,858
                                                                             
5     Date of the transaction (and date on which the threshold is crossed or 
      reached if different):                                                 
                                                                             
      18 May 2010                                                            
                                                                             
6     Date on which issuer notified:                                         
                                                                             
      19 May 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: 14,574,891                                           
                                                                             
      Number of voting rights: 14,574,891                                    
                                                                             
      Resulting situation after the triggering transaction:                  
                                                                             
      Number of shares (direct): 14,432,708                                  
                                                                             
      Number of voting rights (direct): 14,305,996                           
                                                                             
      Number of voting rights (indirect): 126,712                            
                                                                             
      % of voting rights (direct): 6.66%                                     
                                                                             
      % of voting rights (indirect): 0.06%                                   
                                                                             
      Total voting rights: 14,432,708 (6.72%)                                
                                                                             
9     Chain of controlled undertakings through which the voting rights and/or
      the financial instruments are effectively held if applicable:          
                                                                             
      Prudential plc (parent Company)                                       
      M&G Group Limited (wholly owned subsidiary of Prudential plc)          
      M&G Limited (wholly owned subsidiary of M&G Group Limited)             
      M&G Investment Management Limited (wholly owned subsidiary of M&G Limited)


      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 Securities Limited (wholly owned subsidiary of M&G Limited) no     
      longer has a notifiable interest - now "below 5%                       
                                                                             
14    Contact Name:                                                          
                                                                             
      Angela Purtill, Deputy Company Secretary, Johnson Matthey plc          
                                                                             
      Contact Telephone Number:                                              
                                                                             
      020 7269 8461