Re: Holding in Company

Tullow Oil PLC 11 June 2004 SCHEDULE 10 NOTIFICATION OF MAJOR INTERESTS IN SHARES 1. Name of company Tullow Oil plc 2. Name of shareholder having a major interest IFG International Trust Company Limited 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 See 2 above 4. Name of the registered holder(s) and, if more than one holder, the number of shares held by each of them Registered Holder Number of Shares Porthleven Limited 7,892,640 Tarondo Limited 11,196,342 Gemmill Limited 11,196,341 Ferl Limited 11,196,341 Dryden Bank S.A 3,303,702 5. Number of shares / amount of stock acquired 6. Percentage of issued class 7. Number of shares / amount of stock disposed 8. Percentage of issued class 9. Class of security Ordinary 10p shares 10. Date of transaction 11. Date company informed 10 June 2004 12. Total holding following this notification 44,785,366 13. Total percentage holding of issued class following this notification 7.166% 14. Any additional information These shares represent part of the consideration shares issued in relation to the acquisition of Energy Africa Limited and all of the consideration shares issued in relation to the acquisition of 50% of Energy Africa Gabon Holdings Limited. Total shares in issue 624,944,799 15. Name of contact and telephone number for queries Tom Hickey 0207 333 6800 16. Name and signature of authorised company official responsible for making this notification Tom Hickey Date of notification 10 June 2004 The FSA does not give any express or implied warranty as to the accuracy of this document or material and does not accept any liability for error or omission. The FSA is not liable for any damages (including, without limitation, damages for loss of business or loss of profits) arising in contract, tort or otherwise from the use of or inability to use this document, or any material contained in it, or from any action or decision taken as a result of using this document or any such material. 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

Companies

Tullow Oil (TLW)
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