Annual Information Update

Tullow Oil PLC 09 May 2008 Tullow Oil plc (the 'Company') Annual Information Update - 9 May 2007 to 8 May 2008 In accordance with Prospectus Rule 5.2 the Company gives notice that the following information has been published or made available to the public over the previous 12 months. 1. Regulatory Announcements The following regulatory announcements have been made by the Company via RNS, a Regulatory Information Service: Date of Announcement Regulatory Headline 8 May 2008 Blocklisting Interim Review 7 May 2008 Drilling Update 6 May 2008 Operations Update 30 April 2008 Total Voting Rights 30 April 2008 Appraisal Well Update 28 April 2008 Board Change 15 April 2008 Document Availability 3 April 2008 Directors/PDMR Shareholding 3 April 2008 Sale of 10 CMS Blocks 2 April 2008 Total Voting Rights 31 March 2008 Retirement of Director 25 March 2008 Holding in Company 18 March 2008 Holding in Company 13 March 2008 Award of Share Options 13 March 2008 Holding in Company 12 March 2008 Final Results - Part 1 12 March 2008 Final Results - Part 2 12 March 2008 Final Results - Part 3 29 February 2008 Total Voting Rights 25 February 2008 Exploration Update 31 January 2008 Total Voting Rights 31 January 2008 Sale of Interest in M'Boundi 23 January 2008 Trading Statement 3 January 2008 Director/PDMR Shareholding 31 December 2007 Total Voting Rights 21 December 2007 Director/PDMR Shareholding 20 December 2007 Well Update 6 December 2007 Holding in Company 3 December 2007 Electronic Shareholder Communications 30 November 2007 Total Voting Rights 30 November 2007 Holding in Company 29 November 2007 Blocklisting Interim Review 22 November 2007 International Activity Update 31 October 2007 Total Voting Rights 30 October 2007 Holding in Company 24 October 2007 Directorate Change 15 October 2007 Analyst Visit and Activity Update 12 October 2007 Holding in Company 9 October 2007 Well Update 2 October 2007 Director/PDMR Shareholding 2 October 2007 Tullow MPuta-4 Appraisal 28 September 2007 Holding in Company 28 September 2007 Total Voting Rights 18 September 2007 Well Update 4 September 2007 Interim Results - Part 1 4 September 2007 Interim Results - Part 2 3 September 2007 UK Exploration Update 31 August 2007 Total Voting Rights 23 August 2007 Mputa-3 Appraisal 22 August 2007 Exploration Update 31 July 2007 Total Voting Rights 12 July 2007 Holding in Company 11 July 2007 Trading Statement 9 July 2007 Holding in Company 3 July 2007 Director/PDMR Shareholding 2 July 2007 Total Voting Rights 2 July 2007 Holding in Company 18 June 2007 Significant Oil Discovery 15 June 2007 Holding in Company 30 May 2007 AGM - Resolutions 30 May 2007 AGM Statement 15 May 2007 Holding in Company 9 May 2007 Annual Information Update Copies of the documents published via RNS may be obtained from the Regulatory News Service provided by the London Stock Exchange (www.londonstockexchange.com/ rns) market news under code TLW and at the Company's website at www.tullowoil.com . 2. Documents filed with the Registrar of Companies The following documents have been filed by the Company with the Registrar of Companies at Companies House: Date of Filing Type Description of Document 15 April 2008 88(2) Return of Allotment of Shares (2) 14 April 2008 288b Director Resigned 17 March 2008 363a Annual Return made up to 04/02/08 10 March 2008 288b Secretary Resigned 10 March 2008 288a Secretary Appointed 22 January 2008 395 Particulars of Mortgage / Charge 22 January 2008 395 Particulars of Mortgage / Charge 22 January 2008 395 Particulars of Mortgage / Charge 15 January 2008 88(2) O Return of Allotment of Shares 8 January 2008 88(2) R Return of Allotment of Shares (3) 8 January 2008 288b Director Resigned 27 October 2007 88(2) R Return of Allotment of Shares 18 September 2007 88(2) R Return of Allotment of Shares (2) 9 August 2007 395 Particulars of Mortgage / Charge 6 August 2007 AA Group of Companies' Accounts made up to 31/12/06 3 August 2007 395 Particulars of Mortgage / Charge 3 August 2007 395 Particulars of Mortgage / Charge 3 August 2007 395 Particulars of Mortgage / Charge 27 July 2007 88(2) R Return of Allotment of Shares (2) 26 June 2007 88(2) R Return of Allotment of Shares 21 June 2007 288c Directors' Particulars Changed 20 June 2007 Res 11 Authorise Allotment of Security 30/05/07 Disapply Pre-empt Rights 30/05/07 10 May 2007 88(2) R Return of Allotment of Shares (2) Copies of the documents listed above can be obtained from Companies House, Crown Way, Cardiff (email: enquiries@companies-house.gov.uk) or, if you are a registered user, through Companies House Direct at www.direct.companieshouse.gov.uk. 3. Documents sent to shareholders or lodged with the UKLA and Irish Stock Exchange Document Viewing Facilities: The following documents have been sent to the Company's shareholders and lodged with the UKLA and Irish Stock Exchange Document Viewing Facilities. Date Brief Description of Document(s) 15 April 2008 2007 Annual Report and Accounts and Circular Regarding the 2008 Annual General Meeting 15 April 2008 Year in Review to 31 December 2007 11 September 2007 Interim Results Copies of these documents may be viewed at the Document Viewing Facilities of the UK Listing Authority at 25 The North Colonnade, Canary Wharf, London E14 5HS and of the Irish Stock Exchange at Irish Stock Exchange at 28 Anglesea Street, Dublin 2, Ireland. The information referred to in this update was current at the time of publication but some information may now be out of date. The Company does not undertake any obligation to update any such information in the future. No representation is made to the accuracy or completeness of such information and neither this Annual Information Update, not the information referred to above, constitutes an offer of any securities nor a recommendation in respect of any securities. Copies of this Annual Information Update and the documents referred to within it are held at and can be obtained from the Company Secretary at the registered office of the Company, 3rd Floor, Building 11, Chiswick Park, 566 Chiswick High Road, London, W4 5YS. Inquiries Graham Martin Company Secretary +44 208 996 1000 This announcement has been issued through the Companies Announcement Service of The Irish Stock Exchange This information is provided by RNS The company news service from the London Stock Exchange

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