Holding(s) in Company

Cookson Group PLC 07 September 2006 NOTIFICATION OF MAJOR INTERESTS IN SHARES 1. Name of company Cookson Group plc 2. Name of shareholder having a major interest Aviva plc and its subsidiaries 3. Please state whether notification indicates that it is in respect of holding of the shareholder named in 2 above or in respect of a non-beneficial interest or in the case of an individual holder if it is a holding of that person's spouse or children under the age of 18 As in 2 above 4. Name of the registered holder(s) and, if more than one holder, the number of shares held by each of them Morley Fund Management Ltd: BNY Norwich Union Nominees Limited 2,354,549* Chase GA Group Nominees Limited 5,098,773* Chase Nominees Limited 223,302* CUIM Nominee Limited 2,069,950* * denotes beneficial interest 5. Number of shares / amount of stock acquired 393,377 6. Percentage of issued class 0.20% 7. Number of shares / amount of stock disposed n/a 8. Percentage of issued class n/a 9. Class of security Ordinary Shares of 10 pence each 10. Date of transaction 5 September 2006 11. Date company informed 6 September 2006 12. Total holding following this notification 9,746,574* * beneficial interest only 13. Total percentage holding of issued class following this notification 5.06% 14. Any additional information 15. Name of contact and telephone number for queries Rachel Fell, Deputy Secretary, Cookson Group plc - Tel: 020 7822 0062 16. Name and signature of authorised company official responsible for making this notification Rachel Fell, Deputy Secretary, Cookson Group plc Date of notification 7 September 2006 The FSA does not give any express or implied warranty as to the accuracy of this document or material and does not accept any liability for error or omission. The FSA is not liable for any damages (including, without limitation, damages for loss of business or loss of profits) arising in contract, tort or otherwise from the use of or inability to use this document, or any material contained in it, or from any action or decision taken as a result of using this document or any such material. This information is provided by RNS The company news service from the London Stock Exchange

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