Holding(s) in Company

Cookson Group PLC
04 September 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:

THE GOLDMAN SACHS GROUP, INC



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

GOLDMAN, SACHS & CO.

GOLDMAN SACHS ASSET MANAGEMENT INTERNATIONAL

GOLDMAN SACHS ASSET MANAGEMENT, L.P.



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

31 AUGUST 2007



6. Date on which issuer notified:

4 SEPTEMBER 2007



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

15%



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                      29,058,290                         15.01%



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                                                       28,866,978                       14.91%



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


28,866,978                     14.91%



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

The interest in 33,098 shares arose from an interest held by Goldman, Sachs &
Co., a wholly-owned direct subsidiary of GS Inc, acting as custodian for its
customers. These shares are, or will be, registered in the name of Goldman Sachs
Securities (Nominees), Limited.

The interest in 20,910 shares arose from an interest held by Goldman, Sachs &
Co., a wholly-owned direct subsidiary of GS Inc, acting as discretionary
manager. These shares are, or will be, registered in the name of Goldman Sachs
Securities (Nominees), Limited.

The interest in 9,085,993 shares arose from the interest held by Goldman Sachs
Asset Management International, a wholly-owned subsidiary of GS Inc acting as
discretionary manager.  We believe that some of these shares are, or will be,
registered in the name of Goldman Sachs Securities (Nominees), Limited ('GSSN').

The interest in 19,726,977 shares arose from the interest held by Goldman Sachs
Asset Management, LP a wholly owned subsidiary of GS Inc acting as discretionary
manager.  It is believed that some of these shares are, or will be, registered
in the name of Goldman Sachs Securities (Nominees), Limited ('GSSN').



Proxy Voting:



10. Name of the proxy holder:

N/A



11. Number of voting rights proxy holder will cease to hold:

N/A



12. Date on which proxy holder will cease to hold voting rights:

N/A



13. Additional information:

N/A



14. Contact name:

RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC



15. Contact telephone number:

+  44 (0) 20 7822 0000




                      This information is provided by RNS
            The company news service from the London Stock Exchange