Holding(s) in Company

Cookson Group PLC 31 October 2006 SCHEDULE 10 NOTIFICATION OF MAJOR INTERESTS IN SHARES 1) Name of company COOKSON GROUP PLC 2) Name of shareholder having a major interest BARCLAYS 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 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 24 OCTOBER 2006 11) Date company informed 31 OCTOBER 2006 12) Total holding following this notification NOT DISCLOSED 13) Total percentage holding of issued class following this notification NOT DISCLOSED 14) Any additional information BARCLAYS PLC NO LONGER HAS A NOTIFIABLE INTEREST IN THE CAPITAL OF COOKSON GROUP PLC 15) Name of contact and telephone number for queries SILVANA GLIBOTA-VIGO, COMPANY SECRETARIAL ASSISTANT, COOKSON GROUP PLC - 020 7822 0065 16) Name and signature of authorised company official responsible for making this notification SILVANA GLIBOTA-VIGO, COMPANY SECRETARIAL ASSISTANT, COOKSON GROUP PLC Date of notification: 31 OCTOBER 2006 This information is provided by RNS The company news service from the London Stock Exchange

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