Holding(s) in Company

Cookson Group PLC 07 February 2005 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 BARCLAYS GLOBAL INVESTORS LTD (46,849,920 SHARES) BARCLAYS LIFE ASSURANCE CO LTD (2,557,991 SHARES) BARCLAYS GLOBAL INVESTORS, N.A. (17,507,433 SHARES) BARCLAYS GLOBAL INVESTORS JAPAN TRUST & BANKING (1,889,018 SHARES) BARCLAYS GLOBAL FUND ADVISORS (4,414,908 SHARES) GERRARD LTD (279,071 SHARES) BARCLAYS CAPITAL SECURITIES LTD (300,000 SHARES) BARCLAYS GLOBAL INVESTORS AUSTRALIA LTD (307,759 SHARES) BARCLAYS PRIVATE BANK AND TRUST LTD (15,600 SHARES) BARCLAYS GLOBAL INVESTORS JAPAN LTD (443,401 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 1 PENCE EACH 10) Date of transaction 2 FEBRUARY 2005 11) Date company informed 7 FEBRUARY 2005 12) Total holding following this notification 74,565,101 SHARES 13) Total percentage holding of issued class following this notification 3.93% 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: 7 FEBRUARY 2005 This information is provided by RNS The company news service from the London Stock Exchange

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