Re: Holding in Company

Tullow Oil PLC
27 January 2004

Tullow Oil plc



27 January 2004



Re: Holding in Company



The Company was informed on 26 January 2004 by Fidelity Investments on behalf of
FMR Corp. and its direct and indirect subsidiaries and Fidelity International
Limited and its direct and indirect subsidiaries that following an increase in
holdings of 5,288,566 ordinary shares of 10p each since the last notification
they now have a non beneficial interest in a total of 50,838,161 shares
representing 13.45% of the issued share capital of the Company.



The above interests also include the notifiable interest of Edward C Johnson
III, a principal shareholder of Fidelity International and FMR Corp.



The shares are held as follows:



Nominee/Registered Name                                                   Shares
              State Street Nominees Ltd                                      18,500
               Brown Brothers Harriman                                       14,200
              State Street Bank & Trust                                      9,500
                 Chase Nominees Ltd                                        28,113,589
             Chase Manhattan Bank London                                   2,404,538
                   Northern Trust                                           732,600
                      Citibank                                              514,000
                        HSBC                                                271,000
               Bank of New York London                                      392,900
                  MSS Nominees Ltd                                         3,302,516
             Bank of New York - Brussels                                   1,600,797
                    Bankers Trust                                           220,848
                   Bank of Ireland                                          467,199
           Brown Brothers Harriman Ltd LUX                                   60,400
     HSBC Clients Holdings Nominees (UK) Limited                           1,736,262
                   Northern Trust                                          2,174,400
              State Street Bank & Trust                                     231,400
               Bank of New York London                                     2,284,800
                Nortrust Nominees Ltd                                      2,866,300
                    Deutsche Bank                                           114,100
                 Mellon Nominees Ltd                                         92,200
                      JP Morgan                                            1,298,158
              State Street Nominees Ltd                                     729,400
                   Morgan Stanley                                          1,076,100
              Deutsche Bank AG, London                                      112,454





This announcement has been issued through the Companies Announcement Service of

The Irish Stock Exchange







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