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BLOCK LISTING SIX MONTHLY RETURN
Date: 4 January 2010

Name of applicant:                      Cookson Group plc

Name of scheme:                         Cookson Group Executive Share Option
                                        Schemes (CGESOS)

                                        Cookson Group Employee Share Savings
                                        Scheme (CGESSS)

Period of return:            From:      1 July 2009   To: 31 December 2009

Balance of unallotted securities under  CGESOS - 138,771 ordinary £1 shares
scheme(s) from previous return:
                                        CGESSS - 51,060 ordinary £1 shares

Plus:  The amount by which the block    Nil
scheme(s) has been increased since the
date of the last return (if any
increase has been applied for):

Less:  Number of securities issued/     CGESOS - 1,841 ordinary £1 shares
allotted under scheme(s) during period
(see LR3.5.7G):                         CGESSS - Nil

Equals:  Balance under scheme(s) not    CGESOS - 136,930 ordinary £1 shares
yet issued/allotted at end of period:
                                        CGESSS - 51,060 ordinary £1 shares




Name of contact:                                      Rachel Fell

Telephone number of contact:                          020 7822 0000

Name of person making return: Rachel S Fell, Deputy Secretary, Cookson Group
plc
END