Holding in Company

Tullow Oil PLC
27 November 2003

Tullow Oil Plc



27 November 2003



Re: Holding in Company





A Letter from Merrill Lynch Investment Managers dated 25 November 2003

to Tullow Oil Plc, received by Tullow Oil Plc on the 26 November 2003..





Companies Act 1985 ss 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.





Merrill Lynch Investment Managers Limited





Keli Walters

Associate



Katey Neate

Associate















Company Name: Tullow Oil Plc



Class of Shares: 10p Ordinary Shares



Date : 24rd November 2003



Total: Merrill Lynch Investment Managers Limited - 37,845,832 (10.01%)



Made up as follows:


Registered Holder         Number of Shares          Investment Management      Beneficial Interests?
                                                    Company (if separately
(if known)                                          disclosable)               (Yes/No)
Nutraco Nominees Ltd      24,045,591                                           No
(Designated &
Undesignated)
Merrill Lynch Pension     1,454,671                                            Yes
Nominees Ltd A/C Noncert
Chase Nominees Limited    6,247,570                                            No
Nortrust Nominees Limited 2,398,000                                            No
Other                     3,700,000                                            No

TOTAL                     37,845,832



This announcement has been issued through the Companies Announcement Service of

                           the Irish Stock Exchange.






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