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

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