Holding(s) in Company

Cookson Group PLC
02 February 2007



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:

DEUTSCHE BANK AG



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

DEUTSCHE BANK AG

DEUTSCHE INVESTMENT MANAGEMENT AMERICAS INC

DEUTSCHE ASSET MANAGEMENT INVESTMENT GMBH

TILNEY GROUP LIMITED



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

25 JANUARY 2007



6. Date on which issuer notified:

1 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 Triggering transaction
using the ISIN CODE
                                  Number of shares                   Number of voting Rights


GB00B07V4P80                      7,992,304                          4.14%



Resulting situation after the triggering transaction


Class/type of shares if      Number of shares         Number of voting rights           % of voting rights
possible using the ISIN CODE
                             Direct                   Direct       Indirect             Direct      Indirect


GB00B07V4P80                 9,704,005                9,704,005    456,323              5.017       0.235



B: Financial Instruments

Resulting situation after the triggering transaction


Type of         Expiration Date      Exercise/Conversion       Number of voting rights     % of voting rights
financial                            Period/ Date              that may be acquired if the
instrument                                                     instrument is exercised/
                                                               converted.

                                                      N/A



Total (A+B)
Number of voting rights        % of voting rights


10,160,328                     5.25



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



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:

First disclosure made on behalf of Deutsche Bank AG and its subsidiaries in
relation to holdings in Cookson Group plc since the implementation of the DTR in
the UK.



14. Contact name:

RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC



15. Contact telephone number:

020 7822 0000




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