Holding in Company

Tullow Oil PLC 15 July 2003 SCHEDULE 10 NOTIFICATION OF MAJOR INTERESTS IN SHARES 1. Name of company Tullow Oil Plc 2. Name of shareholder having a major interest M&G Investments 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 As Above 4. Name of the registered holder(s) and, if more than one holder, the number of shares held by each of them Clydesdale Nominees - 40,564,285 Chase Nominees - 6,316,006 Others - 6,028,800 5. Number of shares / amount of stock acquired N/A 6. Percentage of issued class N/A 7. Number of shares / amount of stock disposed N/A 8. Percentage of issued class N/A 9. Class of security 10p Ord Shares 10. Date of transaction N/A 11. Date company informed 10/07/03 12. Total holding following this notification 52,909,091 13. Total percentage holding of issued class following this notification 14.00% 14. Any additional information 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 15 July 2003 SCHEDULE 10 NOTIFICATION OF MAJOR INTERESTS IN SHARES 1. Name of company Tullow Oil Plc 2. Name of shareholder having a major interest Lansdowne Partners 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 As Above 4. Name of the registered holder(s) and, if more than one holder, the number of shares held by each of them As Above 5. Number of shares / amount of stock acquired N/A 6. Percentage of issued class N/A 7. Number of shares / amount of stock disposed N/A 8. Percentage of issued class N/A 9. Class of security 10p Ord Shares 10. Date of transaction 11/07/03 11. Date company informed 14/07/03 12. Total holding following this notification 15,811,302 13. Total percentage holding of issued class following this notification 4.18% 14. Any additional information 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 15 July 2003 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 HOLNKPKQKBKDCOD

Companies

Tullow Oil (TLW)
UK 100

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