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: (     )

 

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) : ( Yes: Notification of holding at 20 January 2007 )

 

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

JPMORGAN CHASE & CO

 

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

J.P. MORGAN INVESTMENT MANAGEMENT INC

JPMORGAN ASSET MANAGEMENT (UK) LIMITED

 

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

N/A

 

6. Date on which issuer notified:

13 FEBRUARY 2007

 

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

5%

 

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             
                                                                      
                                                                      
GB00B07V4P80                         N/A           N/A                
                                                                      

 

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
                                                                                     
                                                                                     
GB00B07V4P80                           0            0      11,120,525 0      5.75    
                                                                                     

 

B: 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                                            
                                                                                     

 

Total (A+B)

Number of voting       % of voting      
rights                 rights           
                                        
                                        
11,120,525             5.75             
                                        

 

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 Chase & Co: 11,120,525 voting rights
(5.75%)

Holdings by controlled undertaking of JPMorgan Chase & Co are as follows:

J.P. Morgan Investment Inc: 92,496 voting rights (0.05%)

JPMorgan Asset Management (UK) Limited: 11,028,029 voting rights (5.70%)

 

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:

This is notification of disclosable holding as at 20 January 2007. The group
has other holdings which are covered by exemptions.

 

14. Contact name:

SILVANA GLIBOTA-VIGO, COMPANY SECRETARIAL ASSISTANT, COOKSON GROUP PLC

 

15. Contact telephone number:

020 7822 0000