Holding in Company

Tullow Oil PLC
10 September 2003

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES



1. Name of company


Tullow Oil Plc



2. Name of shareholder having a major interest


Fidelity 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






4. Name of the registered holder(s) and, if more than one holder, the number of
shares held by each of them


Chase Nominees - 25,470,050

MSS Nominees - 3,393,416

Chase Manhattan London - 2,354,347

Other - 10,372,486



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


10p Ord. Shares



10. Date of transaction






11. Date company informed


09/09/03



12. Total holding following this notification


41,590,299



13. Total percentage holding of issued class following this notification


11.01%



14. Any additional information




15. Name of contact and telephone number for queries
Tom Hickey

0044 207 333 6843



16. Name and signature of authorised company official responsible for making
this notification


Tom Hickey





Date of notification


10 September 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