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: Aviva plc & its subsidiaries 4. Full name of shareholder(s) (if different from 3.): Registered Holders: BNY Norwich Union Nominees Limited 1,943,672* Chase GA Group Nominees Limited 8,692,890* Chase Nominees Limited 454,308* CUIM Nominee Limited 1,079,877* Vidacos Nominees Limited 64,329* Chase Nominees Limited 1,207,015 Vidacos Nominees Limited 133,157 * denotes direct interest 5. Date of the transaction (and date on which the threshold is crossed or reached if different): 19 June 2009 6. Date on which issuer notified: 23 June 2009 7. Threshold(s) that is/are crossed or reached: 5% to <5% change at Combined Interest Level 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 GBP 1.00 GB00B3WK5475 14,979,209 14,979,209 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 Direct Indirect Direct Indirect Ordinary Shares GBP 1.00 GB00B3WK5475 12,235,076 12,235,076 1,340,172 4.43 0.48 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 13,575,248 4.91 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable: The voting rights are managed and controlled by Aviva Investors Global Services Limited, with the following chain of controlled undertakings: Aviva Investors Global Services Limited: · Aviva plc (parent company) · Aviva Group Holdings Limited (wholly owned subsidiary of Aviva plc) · Aviva Investors Holdings Limited (wholly owned subsidiary of Aviva Group Holdings Limited) · Aviva Investors Global Services Limited (wholly owned subsidiary of Aviva Investors Holdings Limited) Proxy Voting: 10. Name of the proxy holder: See Section 4 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: 14. Contact name: RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC 15. Contact telephone number: 020 7822 0000

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