Holding(s) in Company

Cookson Group PLC
01 December 2006

                                  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

BANK OF NEW YORK (13,862 SHARES)

BNP PARIBAS (6,932 SHARES)

BOISS NOMINEES LTD - DESIG 4224361 (199,926 SHARES)

BARCLAYS CAPITAL NOMINEES LTD (59,899 SHARES)

BARCLAYS CAPITAL NOMINEES LTD (705,653 SHARES)

BARCLAYS GLOBAL INVESTORS CANADA (13,952 SHARES)

CHASE NOMINEES LTD - DESIG 16376 (98,776 SHARES)

CHASE NOMINEES LTD - DESIG 21359 (74,385 SHARES)

CHASE NOMINEES LTD - DESIG 28270 (65,682 SHARES)

CIBC MELLON GLOBAL SECURITIES (3,661 SHARES)

DURLACHER NOMINEES LTD (124,927 SHARES)

GREIG MIDDLETON NOMINEES LIMITED (GM1) (2,940 SHARES)

INVESTORS BANK AND TRUST CO. (1,717,251 SHARES)

INVESTORS BANK AND TRUST CO. (789,361 SHARES)

JP MORGAN (BGI CUSTODY) - DESIG 16331 (54,925 SHARES)

JP MORGAN (BGI CUSTODY) - DESIG 16341 (106,582 SHARES)

JP MORGAN (BGI CUSTODY) - DESIG 16400 (1,392,988 SHARES)

JP MORGAN (BGI CUSTODY) - DESIG 18409 (178,630 SHARES)

JPMORGAN CHASE BANK (6,218 SHARES)

JPMORGAN CHASE BANK (59,982 SHARES)

JPMORGAN CHASE BANK (12,855 SHARES)

JPMORGAN CHASE BANK (220,752 SHARES)

MELLON TRUST OF NEW ENGLAND (6,671 SHARES)

MELLON TRUST - US CUSTODIAN / (17,723 SHARES)

MITSUI ASSET (3,313 SHARES)

NORTHERN TRUST BANK - BGI SEPA (32,217 SHARES)

RC GREIG NOMINEES LIMITED (9,417 SHARES)

RC GREIG NOMINEES LIMITED GP1 (1,665 SHARES)

RC GREIG NOMINEES LIMITED A/C AK1 (10,475 SHARES)

RC GREIG NOMINEES LIMITED A/C BL1 (12,257 SHARES)

RC GREIG NOMINEES LIMITED A/C CM1 (3,328 SHARES)

STATE STREET BANK & TRUST - W1 (7,336 SHARES)

STATE STREET BOSTON (100,505 SHARES)

STATE STREET TRUST OF CANADA (10,855 SHARES)

THE NORTHERN TRUST COMPANY - U (7,678 SHARES)

TRUST & CUSTODY SERVICES BANK (2,539 SHARES)

ZEBAN NOMINEES LIMITED (24,070 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 10 PENCE EACH

10) Date of transaction

NOT DISCLOSED

11) Date company informed

1 DECEMBER 2006

12) Total holding following this notification

6,160,188

13) Total percentage holding of issued class following this notification

3.19%

14) Any additional information


15) Name of contact and telephone number for queries

RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC - 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: 1 DECEMBER 2006


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