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:

CEVIAN CAPITAL II G.P. LIMITED

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):

10 NOVEMBER 2011

6. Date on which issuer notified:

14 NOVEMBER 2011

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

5%

8. Notified details:

A: Voting rights attached to shares

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

Resulting situation after the triggering transaction

Class/type of      Number of shares Number of voting rights   % of voting      
shares if possible                                            rights           
using the ISIN                                                                 
CODE                                                                           
                                                                               
                                    Direct     Indirect       Direct   Indirect
                                                                               
                                                                               
GB00B3WK5475       16,913,097       16,913,097                6.12%            

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of    Expiration Date Exercise/         Number of voting    % of voting   
financial                  Conversion Period rights that may be  rights        
instrument                 / Date            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    Expiration  Exercise/      Number of       % of voting   
financial  price       date        Conversion     voting rights   rights        
instrument                         period         instrument                    
                                                  refers to                     
                                                                                
                                                                                
                                                                  Nominal Delta 
                                                                                
                                      N/A                                       

Total (A+B+C)

Number of voting       % of voting rights   
rights                                      
                                            
                                            
16,913,097             6.12%                

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

CEVIAN CAPITAL II G.P. LIMITED ACTS AS GENERAL PARTNER FOR CEVIAN CAPITAL II
MASTER FUND L.P.

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