Holdings in Company

Tullow Oil PLC
10 March 2005

                                 TULLOW OIL PLC

                                  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                   Beneficial
                                         of Shares                     Interest

     Nutraco Nominees                   37,300,667                           No
     Limited

     Merrill Lynch Pension               5,103,436                          Yes
     Nominees Ltd A/C NONCERT

     Treasury of the                     1,351,397                           No
     Government of Isle of Man A/C5

     Treasury of the                       629,946                           No
     Government of Isle of Man A/C10

     Stamford Nominees                      59,860                           No
     Limited A/C CHARITY

     Other names                        26,816,711                           No

     Total                              71,262,017


     

5    Number of shares / amount of stock acquired

     Not disclosed

6    Percentage of issued class

     Not Disclosed

7    Number of shares / amount of stock disposed

     Not Disclosed

8    Percentage of issued class

     Not Disclosed

9    Class of security

     Ordinary 10p shares

10   Date of transaction

     -

11   Date company informed

     9 March 2005

12   Total holding following this notification

     71,262,017

13   Total percentage holding of issued class following this notification

     11.028%

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

10 March 2005


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