Holding(s) in Company

Cookson Group PLC 06 August 2003 SCHEDULE 10 NOTIFICATION OF MAJOR INTERESTS IN SHARES 1) Name of company COOKSON GROUP PLC 2) Name of shareholder having a major interest AEGON UK PLC 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 ABOVE 4) Name of the registered holder(s) and, if more than one holder, the number of shares held by each of them CHASE NOMINEES LIMITED 5) Number of shares/amount of stock acquired 7,581,041 SHARES 6) Percentage of issued class 0.40% 7) Number of shares/amount of stock disposed N/A 8) Percentage of issued class N/A 9) Class of security ORDINARY SHARES OF 1 PENCE EACH 10) Date of transaction NOT DISCLOSED 11) Date company informed 5 AUGUST 2003 12) Total holding following this notification 95,940,223 SHARES 13) Total percentage holding of issued class following this notification 5.07% 14) Any additional information N/A 15) Name of contact and telephone number for queries RACHEL FELL, ASSISTANT COMPANY SECRETARY, COOKSON GROUP PLC - 020 7061 6562 16) Name and signature of authorised company official responsible for making this notification RACHEL FELL, ASSISTANT COMPANY SECRETARY, COOKSON GROUP PLC Date of notification: 6 AUGUST 2003 This information is provided by RNS The company news service from the London Stock Exchange

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