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: LEGAL & GENERAL GROUP PLC (L&G) 4. Full name of shareholder(s) (if different from 3.): LEGAL & GENERAL ASSURANCE (PENSIONS MANAGEMENT) LIMITED (PMC) 5. Date of the transaction (and date on which the threshold is crossed or reached if different): 1 JUNE 2009 6. Date on which issuer notified: 3 JUNE 2009 7. Threshold(s) that is/are crossed or reached: FROM 3% - 4% (L&G) 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 ORD GBP 0.10 110,055,528 110,055,528 (pre-consolidation) 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 ORD GBP 1.00 11,224,135 11,224,135 4.06 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 11,224,135 4.06 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable: Legal & General Group Plc (Direct and Indirect) (Group) Legal & General Investment Management (Holdings) Limited (Direct and Indirect) (LGIMH) Legal & General Investment Management Limited (Indirect) (LGIM) Legal & General Group Plc (Direct) (L&G) (11,224,135 - 4.06% = LGAS, LGPL & PMC) Legal & General Investment Management (Holdings) Legal & General Insurance Limited (Direct) (LGIMHD) (10,331,489 - 3.73% = Holdings Limited (Direct) PMC) (LGIH) Legal & General Assurance (Pensions Management) Legal & General Assurance Limited (PMC) (10,331,489 - 3.73% = PMC) Society Limited (LGAS & LGPL) Legal & General Pensions Limited (Direct) (LGPL) 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: 14. Contact name: SILVANA GLIBOTA-VIGO, COMPANY SECRETARIAL ASSISTANT, COOKSON GROUP PLC 15. Contact telephone number: 020 7822 0000

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