Holding(s) in Company

Cookson Group PLC
14 March 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) : (Yes - New Exemption Trading book DTR 5.1.3 (4) )


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):

12 MARCH 2007


6. Date on which issuer notified:

14 MARCH 2007


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

9%


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                      15,559,615                         8.05%



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                                                       17,406,330                       9.00%


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.







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

17,406,330                     9.00%



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

The interest in 309,406 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 17,076,014 shares arose from the interest held by Goldman Sachs
Asset Management, 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 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




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