Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTERESTS IN SHARES
 

1. Identity of the issuer or the underlying issuer of existing shares to which
voting rights are attached:

COOKSON GROUP PLC
 

2. Reason for the notification (please state Yes/No):

 
An acquisition or disposal of voting rights: ( Yes )

 
An acquisition or disposal of financial instruments which may result in the
acquisition of shares already issued to which voting rights are attached: (   
)
 

An event changing the breakdown of voting rights: (    )

 
Other (please specify) (     )

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

JPMorgan Asset Management Holdings Inc.
 

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

JPMorgan Asset Management (UK) Limited

J. P. Morgan Investment Management Inc.

JPMorgan Asset Management (Taiwan) Limited

JPMorgan Chase bank, National Association

 

5. Date of the transaction (and date on which the threshold is crossed or
reached if different):

19 MAY 2010

 
6. Date on which issuer notified:

     21 MAY 2010

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

5% downwards

 
8. Notified details:

 


A: Voting rights attached to shares

 

Class/type of shares if possible        Situation previous to the     
using the ISIN CODE                       Triggering transaction      
                                                                      
                                    Number of    Number of voting     
                                    shares       Rights               
                                                                      
                                                                      
GB00B3WK5475                        14,748,055        14,748,055      
                                                                      

 
Resulting situation after the triggering transaction

 

Class/type of shares if possible using Number of    Number of voting  % of voting    
the ISIN CODE                          shares       rights            rights         
                                                                                     
                                       Direct       Direct Indirect   Direct Indirect
                                                                                     
                                                                                     
GB00B3WK5475                                               13,617,927        4.93    
                                                                                     
 

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

 

Type of      Expiration Exercise/      Number of voting rights that may be   % of    
financial    Date       Conversion     acquired if the instrument is         voting  
instrument              Period/ Date   exercised/ converted.                 rights  
                                                                                     
                                                                                     
                                                                                     
                                                                                     
                                      N/A                                            
                                                                                   

 
C: Financial Instruments with similar economic effect to Qualifying Financial
Instruments

Resulting situation after the triggering transaction

 

Type of         Exercise Expiration   Exercise/         Number of voting rights % of voting rights   
financial       price    date         Conversion period instrument refers to                         
instrument                                                                                           
                                                                                                     
                                                                                                     
                                                                                                    
                                                                                    Nominal     Delta
                                                                                                     
 Contract For                                               71,818                               0.03
  Difference                                                                                         
                                                                                                     

 

Total (A+B+C)

Number of voting       % of voting      
rights                 rights           
                                        
                                        
13,689,745             4.95             
                                        
 

9. Chain of controlled undertakings through which the voting rights and/or the
financial instruments are effectively held, if applicable:

Total disclosable holding for JPMorgan Asset Management Holdings Inc.:
13,689,745 (4.95%)

 
JPMorgan Asset Management (UK) Limited

J. P. Morgan Investment Management Inc.

JPMorgan Asset Management (Taiwan) Limited

JPMorgan Chase bank, National Association
 

Proxy Voting:
 

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:

RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC
 

15. Contact telephone number:

+ 44 (0)20 7822 0000