JOHNSON MATTHEY PLC: 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                               
                                                                               
     An acquisition or disposal of instruments with similar economic effect to 
     qualifying instruments                                                    


                                                                           
3.   Full name of person(s) subject to the notification obligation:             


                                                                               
     BlackRock, Inc.                                                           


                                                                           
4.   Full name of shareholder(s) (if different from 3.):                        


                                                                               
     N/A                                                                       


                                                                           
5.   Date of the transaction (and date on which the threshold is crossed or     


     reached if different):                                                    
                                                                               
     6 March 2013                                                              


                                                                           
6.   Date on which issuer notified:                                             


                                                                               
     7 March 2013                                                              


                                                                           
7.   Threshold(s) that is/are crossed or reached:                               


                                                                               
     Holding has gone above 10%                                                


                                                                           
8.   Notified details:                                                          
                                                                           
A.   VOTING RIGHTS ATTACHED TO SHARES:                                          


                                                                               
     Class/type of shares (if possible using the ISIN CODE):                   
                                                                               
     GB00B70FPS60                                                              
                                                                               
     Situation previous to the triggering transaction:                         
                                                                               
     Number of shares: 20,164,605                                              
     Number of voting rights: 20,164,605                                       
                                                                               
     Resulting situation after the triggering transaction:                     
                                                                               
     Number of shares (direct): N/A                                            
     Number of voting rights (direct): N/A                                     
     Number of voting rights (indirect): 20,254,207                            
     % of voting rights (direct): N/A                                          
     % of voting rights (indirect): 9.88%                                      


                                                                           
B    QUALIFYING FINANCIAL INSTRUMENTS                                           


                                                                               
     N/A                                                                       


                                                                           
C    FINANCIAL INSTRUMENTS WITH SIMILAR ECONOMIC EFFECT TO QUALIFYING FNIANCIAL 


     INSTRUMENTS                                                               
                                                                               
     Type of financial instrument: CFD                                         
     Exercise price: N/A                                                       
     Expiration date: N/A                                                      
     Exercise/Conversion period: N/A                                          
     Number of voting rights instrument refers to: 289,753                     
     % of voting rights (Nominal): 0.14%                                       
     % of voting rights (Delta): 0.14%                                         
     Total voting rights: 20,543,960 shares (10.03%)                           


                                                                           
9.   Chain of controlled undertakings through which the voting rights and/or    


     the financial instruments are effectively held if applicable:             
                                                                               
     BlackRock Investment Management (UK) Limited - 20,543,960 shares (10.03%) 


                                                                           
10.  Name of the proxy holder:                                                  
                                                                           
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:                                                              
                                                                           
15.  Angela Purtill, Deputy Company Secretary, Johnson Matthey plc             
 Contact Telephone Number: 020 7269 8461                                    
7 Mach 2013 
END 
-0- Mar/07/2013 16:48 GMT