Annual Information Update

Cookson Group PLC 10 May 2006 COOKSON GROUP PLC ANNUAL INFORMATION UPDATE - 12 MONTHS UP TO AND INCLUDING 10 MAY 2006 In accordance with Prospectus Rule 5.2, Cookson Group plc sets out below a summary of the information that has been published or made available to the public over the previous twelve months in accordance with laws and rules dealing with the regulation of securities, issuers of securities and securities markets. In accordance with Article 27(3) of the Prospectus Directive Regulation, it is acknowledged that whilst the information referred to in this Annual Information Update was up to date at the time of publication, such disclosures may, at any time, become out of date due to changing circumstances. 1. Announcements made via a Regulatory Information Service All of the announcements listed below were made via RNS and can be obtained from the London Stock Exchange website: www.londonstockexchange.com Date Brief Description of Announcement 24-Apr-06 Completion of Disposal of Laminates 21-Apr-06 Annual Report and Accounts 07-Apr-06 Director/PDMR Shareholding - LTIP Awards Mike Butterworth and Nick Salmon 07-Apr-06 Director/PDMR Shareholding - Share Purchases Mike Butterworth and Nick Salmon 03-Apr-06 Completion of Disposal of Ceramic Fibres 23-Mar-06 Capital Markets Day Presentation 17-Mar-06 Holding(s) in Company - Standard Life 14-Mar-06 Final Results 22-Feb-06 Disposal of Ceramic Fibres 21-Feb-06 SEC De-registration 20-Feb-06 Holding(s) in Company - Standard Life 15-Feb-06 Reduction of Capital 26-Jan-06 Holding(s) in Company - Standard Life 19-Jan-06 Holding(s) in Company - Standard Life 18-Jan-06 Holding(s) in Company - Standard Life 12-Jan-06 Result of EGM 10-Jan-06 Fourth Quarter Trading Update 06-Jan-06 Holding(s) in Company - Britel 04-Jan-06 Blocklisting Interim Review 03-Jan-06 Disposal of Specialty Coating Systems 29-Dec-05 Additional Listing 20-Dec-05 Holding(s) in Company - Britel 20-Dec-05 Holding(s) in Company - Standard Life 19-Dec-05 SEC Deregistration/EGM Notice 19-Dec-05 Holding(s) in Company - Hermes 19-Dec-05 Holding(s) in Company - Britel 15-Dec-05 Disposal of Laminates 22-Nov-05 Holding(s) in Company - Britel 22-Nov-05 Holding(s) in Company - Britel 22-Nov-05 Holding(s) in Company - Standard Life 16-Nov-05 Holding(s) in Company - Fidelity 14-Nov-05 Holding(s) in Company - HBOS 08-Nov-05 Holding(s) in Company - Standard Life 08-Nov-05 Holding(s) in Company - Schroder 07-Nov-05 Holding(s) in Company - Standard Life 04-Nov-05 3rd Quarter Trading Update 17-Oct-05 Proposed Termination of SEC Registration 12-Oct-05 Holding(s) in Company - Standard Life 07-Oct-05 Holding(s) in Company- Barclays 04-Oct-05 Holding(s) in Company - Aviva 26-Sep-05 Holding(s) in Company - Standard Life 19-Sep-05 Termination of ADR Programme 13-Sep-05 Holding(s) in Company - Barclays 18-Aug-05 Holding(s) in Company - Standard Life 03-Aug-05 Director/PDMR Shareholding - Share Purchase Mike Butterworth 02-Aug-05 Director/PDMR Shareholding - LTIP Award Mike Butterworth 26-Jul-05 Interim Results 22-Jul-05 Restatement for IFRS 21-Jul-05 Holding(s) in Company - Fidelity 15-Jul-05 Holding(s) in Company - Standard Life 01-Jul-05 Blocklisting Interim Review 21-Jun-05 Holding(s) in Company - Standard Life 20-Jun-05 Holding(s) in Company - Standard Life 08-Jun-05 Director Shareholding - Share Purchase Jeff Hewitt 06-Jun-05 Form 20-F Submitted to UKLA 26-May-05 Director Shareholding - Share Purchase Jan Oosterveld 26-May-05 Result of AGM 26-May-05 Directorate Change 2. Documents filed at Companies House All of the documents listed below were filed with the Registrar of Companies and copies can be obtained from Companies House, Crown Way, Maindy, Cardiff CF14 3UZ or through Companies House direct at www.direct.companieshouse.gov.uk. Date Brief Description of Filing 28-Apr-06 Change of Registered Office 24-Apr-06 Return on allotments 88(2) 19-Apr-06 Return on allotments 88(2) 19-Apr-06 Return on allotments 88(2) 19-Apr-06 Return on allotments 88(2) 19-Apr-06 Return on allotments 88(2) 03-Apr-06 Return on allotments 88(2) 03-Apr-06 Return on allotments 88(2) 03-Apr-06 Return on allotments 88(2) 13-Mar-06 Return on allotments 88(2) 07-Mar-06 Return on allotments 88(2) 07-Mar-06 Return on allotments 88(2) 07-Mar-06 Return on allotments 88(2) 07-Mar-06 Return on allotments 88(2) 07-Mar-06 Return on allotments 88(2) 07-Mar-06 Return on allotments 88(2) 24-Feb-06 Return on allotments 88(2) 24-Feb-06 Return on allotments 88(2) 22-Feb-06 Return on allotments 88(2) 22-Feb-06 Memorandum and articles of association 20-Feb-06 Return on allotments 88(2) 17-Feb-06 Return on allotments 88(2) 17-Feb-06 Return on allotments 88(2) 17-Feb-06 Return on allotments 88(2) 17-Feb-06 Return on allotments 88(2) 17-Feb-06 Return on allotments 88(2) 17-Feb-06 Return on allotments 88(2) 17-Feb-06 Return on allotments 88(2) 17-Feb-06 Return on allotments 88(2) 17-Feb-06 Return on allotments 88(2) 17-Feb-06 Return on allotments 88(2) 17-Feb-06 Return on allotments 88(2) 17-Feb-06 Return on allotments 88(2) 17-Feb-06 Return on allotments 88(2) 17-Feb-06 Return on allotments 88(2) 17-Feb-06 Return on allotments 88(2) 17-Feb-06 Return on allotments 88(2) 17-Feb-06 Return on allotments 88(2) 17-Feb-06 Resolution re cancellation of share premium, reduction of issued share capital and alteration to articles of association 15-Feb-06 Court certificate re reduction of issued capital and share premium 15-Feb-06 Court order re reduction of issued capital and share premium 06-Feb-06 Declaration mortgage/charge 403a 06-Feb-06 Declaration mortgage/charge 403a 18-Jan-06 Memorandum and articles of association 06-Jan-06 Return on allotments 88(2) 06-Jan-06 Return on allotments 88(2) 06-Jan-06 Return on allotments 88(2) 06-Jan-06 Return on allotments 88(2) 06-Jan-06 Return on allotments 88(2) 06-Jan-06 Return on allotments 88(2) 07-Dec-05 Return on allotments 88(2) 11-Nov-05 Return on allotments 88(2) 09-Nov-05 Return on allotments 88(2) 09-Nov-05 Return on allotments 88(2) 14-Oct-05 Return on allotments 88(2) 12-Oct-05 Return on allotments 88(2) 06-Oct-05 Director resignation 288b 08-Sept-05 Return on allotments 88(2) 01-Sept-05 Return on allotments 88(2) 01-Sept-05 Return on allotments 88(2) 19-Aug-05 Return on allotments 88(2) 17-Aug-05 Return on allotments 88(2) 01-Aug-05 Director resignation 288b 12-Jul-05 Annual return 363a 28-Jun-05 Director appointment 288a 22-Jun-05 Share consolidation 122 17-Jun-05 Return on allotments 88(2) 16-Jun-05 Return on allotments 88(2) 09-Jun-05 Return on allotments 88(2) 08-Jun-05 Director appointment 288a 07-Jun-05 Special resolutions for disapplication of pre-emption rights and authority to allot shares 06-Jun-05 Director resignation 288b 31-May-05 Return on allotments 88(2) 31-May-05 Return on allotments 88(2) 26-May-05 Annual return 363a 16-May-05 Annual Report and Accounts 16-May-05 Return on allotments 88(2) 3. Documents sent to shareholders All of the documents listed below were despatched to holders of Cookson Group plc securities during the last twelve months. Date Brief Description of Documents 21-Apr-06 Notice of Annual General Meeting and Proxy Form 21-Apr-06 Annual Report and Accounts 2005 21-Apr-06 Dividend Reinvestment Plan documentation 19-Dec-05 Notice of Extraordinary General Meeting, Proxy Form and SEC Schedule 13E-3/A 26-Jul-05 Interim Report 2005 4. Documents filed with Financial Services Authority Document Viewing Facility All of the documents listed below were filed with the Financial Services Authority Document Viewing Facility and can be viewed at the UK Listing Authority, The Financial Services Authority, 25 The North Colonnade, Canary Wharf, London E14 5HS. Date Brief Description of Documents 21-Apr-06 Notice of Annual General Meeting and Proxy Form 21-Apr-06 Annual Report and Accounts 2005 21-Apr-06 Dividend Reinvestment Plan documentation 12-Jan-06 Resolutions passed at EGM 19-Dec-05 Notice of Extraordinary General Meeting, Proxy Form and SEC Schedule 13E-3/A 26-Jul-05 Interim Report 2005 26-May-05 Resolutions passed as Special Business at AGM 2005 5. Documents filed with the Securities and Exchange Commission ('SEC') The Company submitted filings with the SEC until 21 February 2006, when the Company submitted Form 15, with the SEC to terminate the registration of its Ordinary Shares. Full details of these filings can be viewed at www.sec.gov/ edgar/searchedgar/webusers.htm Copies of the Annual and Interim Reports 2005, the Annual General meeting documentation and Form 20-F 2004 can be found on Cookson's website at www.cooksongroup.co.uk Copies of all documents referred to above are also available from the Group Secretary, Cookson Group plc, 165 Fleet Street, London EC4A 2AE England. Further enquiries: Rachel Fell Tel : + 44(0)20 7822 0000 Deputy Secretary This information is provided by RNS The company news service from the London Stock Exchange

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