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: ( ) An event changing the breakdown of voting rights: ( ) Other (please specify): ( ) 3. Full name of person(s) subject to the notification obligation: Adage Capital Partners GP LLC 4. Full name of shareholder(s) (if different from 3.): JP Morgan Custodial Trust Company and Morgan Stanley & Co. 5. Date of the transaction (and date on which the threshold is crossed or reached if different): 6 July 2010 6. Date on which issuer notified: 8 July 2010 7. Threshold(s) that is/are crossed or reached: 3% 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 Shares GB00B3WK5475 11,295,982 11,295,982 Resulting situation after the triggering transaction Class/type of shares if possible using Number of Number of voting % of voting the ISIN CODE shares rights rights Direct Indirect Direct Indirect Ordinary Shares GB00B3WK5475 8,486,945 8,486,945 3.07 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 None C:Financial Instruments with similar economic effect to Qualifying Financial instruments Resulting situation after the triggering transaction Type of Expiration Exercise/ Number of voting rights that may be % of voting financial Date Conversion acquired if the instrument is rights instrument Period/ Date exercised/ converted. Nominal Delta None Total (A+B+C) Number of voting % of voting rights rights 8,486,945 3.07 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable: JP Morgan Custodial Trust Company and Morgan Stanley & Co. are the custodians of the shares held by Adage Custodial Partners GP LLC. 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: 14. Contact name: RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC 15. Contact telephone number: + 44 (0) 20 7822 0000

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