Re: Holding in Company

Tullow Oil PLC
24 February 2004

Tullow Oil plc





24th February  2004



Re: Holding in Company





A letter from Merrill Lynch Investment Managers to Tullow Oil plc dated 23rd
February 2004, received by the Tullow Oil plc on 24th February 2004.



Companies Act 1985ss - 198-202 (as amended)



We are advised that for the purposes of the above provisions Merrill Lynch
Investment Managers Limited has interests in the relevant share capital of your
company which are disclosable pursuant to section 199(2) of the above Act.  Save
where specifically identified to the contrary such interests arise by reason of
discretionary investment management arrangements entered into by us or by our
affiliates in the Merrill Lynch Investment Managers Limited.  Each such
affiliate is interested in the relevant share capital to the extent set out in
the attachment and, where applicable, this letter constitutes disclosure on
behalf of such affiliates.  Relevant details of such interests are set out in
the attachment to this letter.





Keli Walters

Associate



Katey Neate

Associate

Merrill Lynch Investment Managers Limited









Date: 20th February 2004





Company Name: Tullow Oil plc



Class of Shares: 10p Ordinary Shares



Total Interest held by: Merrill Lynch Investment Managers Limited: 45,463,800
(12.03%)





Made up as follows:


Registered Holder          Number of Shares          Investment Management      Beneficial Interests? (Yes
                                                     Company (if separately     /No)
(if known)                                           disclosable)






Nutraco Nominees Limited   26,900,570                                           No
(Designated &
Undesignated)
Merrill Lynch Pension      4,823,250                                            Yes
Nominees Limited A/C
NONCERT
Chase NomineesLimited      5,797,570                                            No
Nortrust Nominees Limited  2,956,885                                            No
Bank of New York Nominees  1,385,525                                            No
Limited
Other                      3,600,000                                            No
TOTAL                      45,463,800









This announcement has been issued through the Companies Announcement Service of

The Irish Stock Exchange














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