Holdings in Company

Tullow Oil PLC
27 July 2005

                   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                49,005,329                   No
     Limited

     Merrill Lynch Pension            5,575,160                  Yes
     Nominees Ltd A/C Noncert

     Treasury of the                  1,400,897                   No
     Government of the Isle of Man
     Nominees A/C 5

     Treasury of the                    666,046                   No
     Government of the Isle of Man
     Nominees A/C 10

     Stamford Nominees                  184,800                   No
     Limited A/C CHARITY

     Other names                     33,743,430                   No

     Total                           90,575,662


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

     26 July 2005

12   Total holding following this notification

     90,575,662

13   Total percentage holding of issued class following this notification

     14.00%

14   Any additional information

     Total shares in issue 646,645,574

15   Name of contact and telephone number for queries

     Richard Taylor 0207 333 6800

16   Name and signature of authorised company official responsible for
     making this notification

     Richard Taylor

Date of notification

27 July 2005

The FSA does not give any express or implied warranty as to the accuracy of this
document or material and does not accept any liability for error or omission.
The FSA is not liable for any damages (including, without limitation, damages
for loss of business or loss of profits) arising in contract, tort or otherwise
from the use of or inability to use this document, or any material contained in
it, or from any action or decision taken as a result of using this document or
any such material.


                      This information is provided by RNS
            The company news service from the London Stock Exchange