Holding(s) in Company

Cookson Group PLC 22 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 82,294,569 NORTHERN TRUST LONDON FIDELITY INTERNATIONAL LIMITED 389,860 JP MORGAN, BOURNEMOUTH FIDELITY INVESTMENT SERVICES LIMITED 21,358,452 JPMORGAN CHASE BANK FMR CORP 30,000 JP MORGAN, BOURNEMOUTH FIDELITY PENSION MANAGEMENT 5,970,747 NORTHERN TRUST LONDON FIDELITY PENSION MANAGEMENT 330,255 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 14,895,200 8) Percentage of issued class 0.79% 9) Class of security ORDINARY SHARES OF 1 PENCE EACH 10) Date of transaction NOT DISCLOSED 11) Date company informed 21 MARCH 2005 12) Total holding following this notification 111,588,576 SHARES 13) Total percentage holding of issued class following this notification 5.89% 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: 22 MARCH 2005 This information is provided by RNS The company news service from the London Stock Exchange

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