Holding(s) in Company

Tullow Oil PLC
19 June 2002


                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES



1. Name of company


Tullow Oil Plc



2. Name of shareholder having a major interest


Morgan Stanley Securities Ltd



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


Not Disclosed



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


Morgan Stanley Securities Limited



5. Number of shares / amount of stock acquired


N/D



6. Percentage of issued class


N/D



7. Number of shares / amount of stock disposed


N/D



8. Percentage of issued class


N/D



9. Class of security


10p Ordinary Shares



10. Date of transaction


11 June 2002


11. Date company informed


14 June 2002



12. Total holding following this notification


11,800,000



13. Total percentage holding of issued class following this notification


3.29%



14. Any additional information


N/A



15. Name of contact and telephone number for queries


Tom Hickey  0207 333 6843



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


Tom Hickey

Date of notification


19 June 2002




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