Holding in Company

Tullow Oil PLC
02 March 2005

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES



1. Name of company


Tullow Oil plc



2. Name of shareholder having a major interest


Merrill Lynch Investment Managers Group 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 4 below



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

Beneficial Interests

(Yes/No)



Nutraco Nominees Limited

35,865,533

No



Merrill Lynch Pension Nominees Ltd A/C NONCERT

  4,680,659

Yes



Treasury of the Government of Isle of Man A/C5

  1,351,397

No



Treasury of the Government of Isle of Man A/C10

    629,946

No



Stamford Nominees Limited A/C  CHARITY

      26,296



No



Morgan Nominees Limited

 1,770,186



No



Chase Nominees Limited

 4,740,000



No



Bank of New York Nominees Limited

 1,115,947



No



Nortrust Nominees Limited

  3,064,000



No



Other names

13,790,816

No









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


1 March 2005



12. Total holding following this notification


67,034,780 (as at 25 February 2005)



13. Total percentage holding of issued class following this notification


10.37%



14. Any additional information


Total shares in issue 646,179,868



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


1 March 2005



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for loss of business or loss of profits) arising in contract, tort or otherwise
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it, or from any action or decision taken as a result of using this document or
any such material.







This announcement has been issued through the Companies Announcement Service of

                           the Irish Stock Exchange.








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