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:            
                                                                               
     Vanguard Precious Metals & Mining                                         
                                                                               
4    Full name of shareholder(s) (if different from 3.):                       
                                                                               
5    Date of the transaction (and date on which the threshold is crossed or    
     reached if different):                                                    
                                                                               
     4 June 2010                                                               
                                                                               
6    Date on which issuer notified:                                            
                                                                               
     27 May 2011                                                               
                                                                               
7    Threshold(s) that is/are crossed or reached:                              
                                                                               
     3%                                                                        
                                                                               
8    Notified details:                                                         
                                                                               
     VOTING RIGHTS ATTACHED TO SHARES:                                         
                                                                               
     Class/type of shares (if possible using the ISIN CODE):                   
                                                                               
     Ordinary £1 Share                                                         
                                                                               
     GB0004764071                                                              
                                                                               
     Situation previous to the triggering transaction:                         
                                                                               
     Number of shares: 6,450,000                                               
                                                                               
     Number of voting rights: 6,450,000                                        
                                                                               
     Resulting situation after the triggering transaction:                     
                                                                               
     Number of shares (direct): 6,250,000                                      
                                                                               
     Number of voting rights (direct): 6,250,000                               
                                                                               
     Number of voting rights (indirect): N/A                                   
                                                                               
     % of voting rights (direct): 2.91%                                        
                                                                               
     % of voting rights (indirect): N/A                                        
                                                                               
     Total voting rights: 6,250,000 (2.91%)                                    
                                                                               
9    Chain of controlled undertakings through which the voting rights and/or   
     the financial instruments are effectively held if applicable:             
                                                                               
     PROXY VOTING:                                                             
                                                                               
10   Name of the proxy holder:                                                 
                                                                               
     N/A                                                                       
                                                                               
11   Number of voting rights proxy holder will cease to hold:                  
                                                                               
12   Date on which proxy holder will cease to hold voting rights:              
                                                                               
13   Additional Information                                                    
                                                                               
14   Contact Name:                                                             
                                                                               
     Angela Purtill, Deputy Company Secretary, Johnson Matthey plc             
                                                                               
     Contact Telephone Number:                                                  
     020 7269 8461                                                             


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