Holding(s) in Company

Cookson Group PLC 20 December 2005 SCHEDULE 10 NOTIFICATION OF MAJOR INTERESTS IN SHARES 1) Name of company COOKSON GROUP PLC 2) Name of shareholder having a major interest BRITEL FUND TRUSTEES LIMITED 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 BRITEL FUND NOMINEES LTD (335,093 SHARES) CHASE NOMINEES LTD (6,929,047 SHARES) 5) Number of shares/amount of stock acquired N/A 6) Percentage of issued class N/A 7) Number of shares/amount of stock disposed NOT DISCLOSED 8) Percentage of issued class NOT DISCLOSED 9) Class of security ORDINARY SHARES OF 10 PENCE EACH 10) Date of transaction 19 DECEMBER 2005 11) Date company informed 20 DECEMBER 2005 12) Total holding following this notification 7,264,140 SHARES 13) Total percentage holding of issued class following this notification 3.82% 14) Any additional information 15) Name of contact and telephone number for queries RACHEL BENJAMIN, COMPANY SECRETARIAL ASSISTANT, COOKSON GROUP PLC - 020 7061 6565 16) Name and signature of authorised company official responsible for making this notification RACHEL BENJAMIN, COMPANY SECRETARIAL ASSISTANT, COOKSON GROUP PLC Date of notification: 20 DECEMBER 2005 This information is provided by RNS The company news service from the London Stock Exchange

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