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:

Adage Capital Partners GP LLC

 

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

JP Morgan Custodial Trust Company and Morgan Stanley & Co.

 

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

6 July 2010

 

6. Date on which issuer notified:

8 July 2010

 

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

3%

 

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 shares Number of voting 
                                                     Rights           
                                                                      
Ordinary Shares                                                       
                                                                      
GB00B3WK5475                             11,295,982       11,295,982  
                                                                      
                                                                      
                                                                      

 

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    Indirect Direct Indirect
                                                                                     
Ordinary Shares                                                                      
                                                                                     
GB00B3WK5475                           8,486,945   8,486,945          3.07           
                                                                                     

 

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  
                                                                                     
                                                                                     
                                     None                                            
                                                                                     
                                                                                     
                                                                                     

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

 

Resulting situation after the triggering transaction

 

Type of     Expiration Exercise/     Number of voting rights that may be % of voting 
financial   Date       Conversion    acquired if the instrument is       rights      
instrument             Period/ Date  exercised/ converted.                           
                                                                                     
                                                                         Nominal     
                                                                         Delta       
                                                                                     
                                     None                                            
                                                                                     

 

Total (A+B+C)

Number of voting       % of voting      
rights                 rights           
                                        
8,486,945              3.07             
                                        

 

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

 

JP Morgan Custodial Trust Company and Morgan Stanley & Co. are the custodians
of the shares held by Adage Custodial Partners GP LLC.

 

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