Holding(s) in Company

Cookson Group PLC 02 August 2006 SCHEDULE 10 NOTIFICATION OF MAJOR INTERESTS IN SHARES 1) Name of company COOKSON GROUP PLC 2) Name of shareholder having a major interest HBOS 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 IN 2 ABOVE 4) Name of the registered holder(s) and, if more than one holder, the number of shares held by each of them REGISTERED HOLDER FUND NUMBER OF SHARES HSDL NOMINEES LTD N/A 4 NORTRUST NOMINEES a/c ARW49 SLBA 143,573 NORTRUST NOMINEES a/c ARW51 SLFO 142,105 NORTRUST NOMINEES a/c ARW56 SXLFE 157,511 NORTRUST NOMINEES a/c CMI06 WP 3,521,941 NORTRUST NOMINEES a/c CMI10 1105 376,453 NORTRUST NOMINEES a/c CMM13 2314 2,324,758 NORTRUST NOMINEES a/c HLI24 HPBA 16,780 NORTRUST NOMINEES a/c HLI26 HPFO 15,110 NORTRUST NOMINEES a/c HLI27 HXPEN 18,731 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 NOT DISCLOSED 11) Date company informed 2 AUGUST 2006 12) Total holding following this notification 6,716,966 SHARES 13) Total percentage holding of issued class following this notification 3.485% 14) Any additional information 15) Name of contact and telephone number for queries RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC - TEL: 020 7822 0062 16) Name and signature of authorised company official responsible for making this notification RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC Date of notification: 2 AUGUST 2006 This information is provided by RNS The company news service from the London Stock Exchange

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