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



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The Irish Stock Exchange







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