Holding in Company

Cookson Group PLC 5 September 2000 Schedule 10 - Notification of Major Interests in Shares 1 Name of company: Cookson Group plc 2 Name of shareholder having a major interest: THE ALPINE GROUP, INC 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 registered holder(s) and, if more than one holder, the number of shares held by each of them: AS ABOVE 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: 3,710,000 8 Percentage of issued class: 0.51% 9 Class of security: COOKSON GROUP PLC ORDINARY SHARES OF 50P EACH 10 Date of transaction: PRIOR TO 1 SEPTEMBER 2000 11 Date company informed: 4 SEPTEMBER 2000 12 Total holding following this notification: 28,605,888 ORDINARY SHARES OF 50P EACH 13 Total percentage holding of issued class following this notification: 3.94% 14 Contact name for queries: JULIA BAGGULEY 15 Contact telephone number: 020 7766 4537 16 Name of company official responsible for making notification: JULIA BAGGULEY 17 Date of notification: 5 SEPTEMBER 2000 Additional Information:

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