Holding(s) in Company

Tullow Oil PLC
30 May 2002

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES



1. Name of company


Tullow Oil Plc



2. Name of shareholder having a major interest


Schroder Investment Mgmnt



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


Schroder Nominees - 12,203,295

Chase Nominee - 9,475,714

Other - 10,046,264



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 Ordinary Shares



10. Date of transaction


n/a






11. Date company informed


29 May 2002



12. Total holding following this notification


31,725,273



13. Total percentage holding of issued class following this notification


8.85%



14. Any additional information


n/a



15. Name of contact and telephone number for queries


Tom Hickey

 Te: 0035312185707



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


Thomas Hickey



Date of notification


30 May 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