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: ( No ) An event changing the breakdown of voting rights: ( No ) Other (please specify): ( No) 3. Full name of person(s) subject to the notification obligation: Governance for Owners LLP 4. Full name of shareholder(s) (if different from 3.): Governance for Owners European Focus Fund 1 968,073 Governance for Owners European Focus Fund 2 2,227,440 Governance for Owners European Focus Fund 3 3,413,011 Governance for Owners European Focus Fund 4 4,295,170 Governance for Owners European Focus Fund 5 165,170 5. Date of the transaction (and date on which the threshold is crossed or reached if different): 24 August 2010 6. Date on which issuer notified: 25 August 2010 7. Threshold(s) that is/are crossed or reached: 4% 8. Notified details: …………….. A: Voting rights attached to shares Class/type of shares if possible Situation previous to the using the ISIN CODE Triggering transaction Number of shares Number of voting Rights Ordinary GB00B3WK5475 10,918,864 10,918,864 Resulting situation after the triggering transaction Class/type of shares if possible Number of Number of voting % of voting using the ISIN CODE shares rights rights Direct Indirect Direct Indirect Ordinary GB00B3WK5475 11,068,864 11,068,864 4.00 B: Financial Instruments Resulting situation after the triggering transaction Type of Expiration Exercise/ Number of voting rights that may be % of financial Date Conversion acquired if the instrument is voting instrument Period/ Date exercised/ converted. rights N/A Total (A+B) Number of voting % of voting rights rights 11,068,864 4.00 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable: See Section 4 Proxy Voting: 10. Name of the proxy holder: See Section 3 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

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