Holding(s) in Company

Cookson Group PLC 14 March 2005 SCHEDULE 10 NOTIFICATION OF MAJOR INTERESTS IN SHARES 1) Name of company COOKSON GROUP PLC 2) Name of shareholder having a major interest FMR Corp. & FIDELITY INTERNATIONAL 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 NON-BENEFICIAL INTEREST 4) Name of the registered holder(s) and, if more than one holder, the number of shares held by each of them REGISTERED NAME MANAGEMENT COMPANY NUMBER OF SHARES JP MORGAN, BOURNEMOUTH FIDELITY INVESTMENTS INTERNATIONAL 1,214,693 BROWN BROS HARRIMN LTD LUX FIDELITY INTERNATIONAL LIMITED 86,764,469 NORTHERN TRUST LONDON FIDELITY INTERNATIONAL LIMITED 411,060 JP MORGAN, BOURNEMOUTH FIDELITY INVESTMENT SERVICES LIMITED 28,580,597 JPMORGAN CHASE BANK FMR CORP 30,000 BANK OF NEW YORK BRUSSELS FIDELITY PENSION MANAGEMENT 495,955 BANK OF NEW YORK EUROPE LDN FIDELITY PENSION MANAGEMENT 126,880 CITIBANK LONDON FIDELITY PENSION MANAGEMENT 204,700 JP MORGAN, BOURNEMOUTH FIDELITY PENSION MANAGEMENT 6,295,047 NORTHERN TRUST LONDON FIDELITY PENSION MANAGEMENT 2,006,075 STATE STR BK AND TR CO LNDN FIDELITY PENSION MANAGEMENT 354,300 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 25,116,665 8) Percentage of issued class 1.325% 9) Class of security ORDINARY SHARES OF 1 PENCE EACH 10) Date of transaction NOT DISCLOSED 11) Date company informed 14 MARCH 2005 12) Total holding following this notification 126,483,776 SHARES 13) Total percentage holding of issued class following this notification 6.671% 14) Any additional information 15) Name of contact and telephone number for queries RACHEL BENJAMIN, COMPANY SECRETARIAL ASSISTANT, COOKSON GROUP PLC - TEL: 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: 14 MARCH 2005 This information is provided by RNS The company news service from the London Stock Exchange

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