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): ( Yes - Increase in share capital )


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

BlackRock, Inc


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

 

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

15 December 2009


6. Date on which issuer notified:

16 December 2009


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

Holding has gone above 11%


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  
                                                                      
                                                                      
GB00B3WK5475           28,144,367              28,144,367             
                                                                      
      
 

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             Direct     Indirect         Direct    Indirect  
                                                                                         
                                                                                         
GB00B3WK5475           N/A               N/A        29,708,666        N/A      10.75     
                                                                                         

 

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

 

Type of     Exercise price   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.                 
                                                                                                        
                                                                                                        
                                                                                                        
                                      N/A                                                               
                                                                                                        

 

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

Resulting situation after the triggering transaction

 

Type of     Exercise price   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  
                                                                                                         
    CFD           N/A              N/A                N/A                780,501          0.28           
                                                                                                         

 

 

Total (A+B+C)

Number of voting     % of voting rights 
rights                                  
                                        
                                        
30,489,167           11.03              
                                        

 

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

 

BlackRock Investment Management (UK) Limited - 30,489,167 (11.03%)

 

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:

020 7822 0000