Blocklisting Interim Review

Name of applicant:

Cookson Group plc

Name of scheme:

Cookson Group Executive Share Option Schemes (CGESOS)

Cookson Group Long-Term Incentive Plan (CGLTIP)

Period of return:

From:

1 January 2012

To:

30 June 2012

Balance of unallotted securities under scheme(s) from previous return:

CGESOS - 110,397 ordinary £1 shares

CGLTIP - Nil

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

CGESOS - 100,000 ordinary £1 shares

CGLTIP - 2,000,000 ordinary £1 shares

Less:  Number of securities issued/allotted under scheme(s) during period (see LR3.5.7G):

CGESOS - 11,751 ordinary £1 shares

CGLTIP - 1,890,000 ordinary £1 shares

Equals:  Balance under scheme(s) not yet issued/allotted at end of period:

CGESOS - 198,646 ordinary £1 shares

CGLTIP - 110,000 ordinary £1 shares

Name of contact:

Rachel Fell

Telephone number of contact:

020 7822 0000