Holding(s) in Company

Cookson Group PLC 20 August 2004 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 CAPITAL SECURITIES LIMITED (475,000 SHARES) BARCLAYS GLOBAL INVESTORS LIMITED (59,264,841 SHARES) BARCLAYS GLOBAL INVESTORS JAPAN LIMITED (385,296 SHARES) BARCLAYS GLOBAL INVESTORS JAPAN TRUST & BANKING (1,912,529 SHARES) BARCLAYS GLOBAL INVESTORS, N.A. (28,021,522 SHARES) BARCLAYS GLOBAL FUND ADVISORS (765,009 SHARES) BARCLAYS GLOBAL INVESTORS AUSTRALIA LIMITED (1,022,446 SHARES) BARCLAYS LIFE ASSURANCE CO LIMITED (2,611,570 SHARES) BARCLAYS PRIVATE BANK AND TRUST LIMITED (15,600 SHARES) GERRARD LIMITED (317,088 SHARES) 5) Number of shares/amount of stock acquired NOT DISCLOSED 6) Percentage of issued class NOT DISCLOSED 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 18 AUGUST 2004 11) Date company informed 20 AUGUST 2004 12) Total holding following this notification 94,790,901 SHARES 13) Total percentage holding of issued class following this notification 5.00% 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 AUGUST 2004 This information is provided by RNS The company news service from the London Stock Exchange

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