Holding(s) in Company

Tullow Oil PLC
13 January 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

As Above


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

22,098,889 - Chase Nominees
6,094,190 - Various


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 Ordinary


10. Date of transaction

09/01/03


11. Date company informed

10/01/03


12. Total holding following this notification

28,193,079


13. Total percentage holding of issued class following this notification

7.85%


14. Any additional information

N/A


15. Name of contact and telephone number for queries

Tom Hickey


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

Tom Hickey


Date of notification

13 January 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