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:            
                                                                               
     Ameriprise Financial, Inc. and its group                                  
                                                                               
4.   Full name of shareholder(s) (if different from 3.):                       
                                                                               
     See additional information under 13.                                      
                                                                               
5.   Date of the transaction (and date on which the threshold is crossed or    
     reached if different):                                                    
                                                                               
     24 August 2007                                                            
                                                                               
6.   Date on which issuer notified:                                            
                                                                               
     3 September 2007                                                          
                                                                               
7.   Threshold(s) that is/are crossed or reached:                              
                                                                               
     Gone below 5%                                                             
                                                                               
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: 13,815,035                                              
                                                                               
     Number of voting rights: 13,815,035                                       
                                                                               
     Resulting situation after the triggering transaction:                     
                                                                               
     Number of shares (direct): 10,564,458                                     
                                                                               
     Number of voting rights (direct): 450,386                                 
                                                                               
     Number of voting rights (indirect): 10,114,072                            
                                                                               
     % of voting rights (direct): 0.209%                                       
                                                                               
     % of voting rights (indirect): 4.702%                                     
                                                                               
     Total voting rights: 10,564,458 shares (4.911%)                           
                                                                               
9.   Chain of controlled undertakings through which the voting rights and/or   
     the financial instruments are effectively held if applicable:             
                                                                               
     Ameriprise Financial, Inc., which controls the voting rights of           
     Threadneedle Asset Management Holdings Ltd, which controls the voting     
     rights of Threadneedle Asset Management Ltd, Threadneedle International   
     Ltd and Threadneedle Pensions Ltd.                                        
                                                                               
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:                                                   
                                                                               
     Registered Owner
     Ameriprise Financial Inc                   A/C                   87,119                                      
     Bank of Ireland Nominees                   A/C 4270483           123,372                              
     Bank of Ireland Nominees                   A/C 4239914           192,709                              
     BNY (OCS) Nominees Ltd                     A/C 219064            67,418                                  
     BNY (OCS) Nominees Ltd                     A/C 277650            151,072                                 
     Littledown Nominees Ltd                    A/C 11121             3,250                                   
     Littledown Nominees Ltd                    A/C 35822             4,400                                   
     Littledown Nominees Ltd                    A/C 10479             7,253                                   
     Littledown Nominees Ltd                    A/C 10478             9,000                                   
     Littledown Nominees Ltd                    A/C 7199              20,004                                   
     Littledown Nominees Ltd                    A/C 18668             20,938                                  
     Littledown Nominees Ltd                    A/C 7196              31,100                                  
     Littledown Nominees Ltd                    A/C 21688             125,960                                 
     Littledown Nominees Ltd                    A/C 10469             126,184                                 
     Littledown Nominees Ltd                    A/C 10489             128,814                                
     Littledown Nominees Ltd                    A/C 27642             156,226                                
     Littledown Nominees Ltd                    A/C 10492             250,000                                 
     Littledown Nominees Ltd                    A/C 7205              286,884                                  
     Littledown Nominees Ltd                    A/C 7198              292,253                                 
     Littledown Nominees Ltd                    A/C 7207              381,367                                  
     Littledown Nominees Ltd                    A/C 2642              409,641                                  
     Littledown Nominees Ltd                    A/C 10491             708,419                                
     Littledown Nominees Ltd                    A/C 10488             1,922,404                               
     Littledown Nominees Ltd                    A/C 2891              4,382,722                                
     Mellon Nominees (UK) Ltd                   A/C WWSF0004002       157,444                          
     Roy Nominees                               A/C 104450            55,964                                          
     State Street Bank & Trust, Boston          A/C GPE1              42,050                        
     The Bank of New York (nominees) Limited    A/C 96111             1,907                   
     The Bank of New York (nominees) Limited    A/C 960011            5,054                  
     The Bank of New York (nominees) Limited    A/C 960053            21,536                 
     The Bank of New York (nominees) Limited    A/C 254362            84,135                 
     The Bank of New York (nominees) Limited    A/C 960028            102,397                
     The Bank of New York (nominees) Limited    A/C 960253            185,462                
     William & Glyns (Isle of Man)Nominees Ltd  A/C 301780            20,000                                            
                                                                               
14.  Contact Name:                                                             
                                                                               
15.  Angela Purtill, Assistant Company Secretary, Johnson Matthey plc          
                                                                               
     Contact Telephone Number:                                                 
     020 7269 8461                                                             
                                                                               
     4 September 2007