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):

23 February 2010

 

6. Date on which issuer notified:

25 February 2010

 

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

4%

 

8. Notified details:

……………..

 

A: Voting rights attached to shares

 

Class/type of shares  Situation previous to the Triggering transaction
if possible using the                                                 
ISIN CODE                                                             
                                                                      
                      Number of shares       Number of voting Rights  
                                                                      
                                                                      
Ordinary Shares                                                       
                                                                      
GB00B3WK5475          10,595,982               10,595,982             
                                                                      

 

Resulting situation after the triggering transaction

 

Class/type of shares  Number of shares   Number of voting rights     % of voting rights  
if possible using the                                                                    
ISIN CODE                                                                                
                                                                                         
                                         Direct     Indirect         Direct    Indirect  
                                                                                         
                                                                                         
Ordinary Shares                                                                          
                                                                                         
GB00B3WK5475          11,295,982         11,295,982                  4.08                
                                                                                         

 

B: Financial Instruments

Resulting situation after the triggering transaction

 

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

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

 

Resulting situation after the triggering transaction

 

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

 

Total (A+B+C)

Number of voting     % of voting rights 
rights                                  
                                        
                                        
11,295,982           4.08               
                                        

 

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