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: BlackRock, Inc 4. Full name of shareholder(s) (if different from 3.): 5. Date of the transaction (and date on which the threshold is crossed or reached if different): 18 December 2009 6. Date on which issuer notified: 22 December 2009 7. Threshold(s) that is/are crossed or reached: Holding has gone above 11% 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 GB00B3WK5475 28,567,619 28,567,619 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 Direct Indirect Direct Indirect GB00B3WK5475 N/A N/A 29,763,260 N/A 10.77 B: Qualifying Financial Instruments Resulting situation after the triggering transaction Type of Exercise Expiration Exercise/ Number of voting rights that may be % of financial price Date Conversion acquired if the instrument is exercised/ voting instrument Period/ Date converted. rights N/A C: Financial Instruments with similar economic effect to Qualifying Financial Instruments Resulting situation after the triggering transaction Type of Exercise Expiration Exercise/ Number of voting rights that may be % of voting financial price Date Conversion acquired if the instrument is rights instrument Period/ Date exercised/ converted. Nominal Delta CFD N/A N/A N/A 695,518 0.25 Total (A+B+C) Number of voting % of voting rights rights 30,458,778 11.02 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable: BlackRock Investment Management (UK) Limited - 30,458,778 (11.02%) 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: 020 7822 0000

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