Holding(s) in Company

Tullow Oil PLC
02 August 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 Limited                             48,929,067       No

Merrill Lynch Pension Nominees Ltd A/C Noncert        5,508,060       Yes

Treasury of the Government of the Isle of Man         1,250,497       No
Nominees A/C 5                                                        

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

Stamford Nominees Limited A/C CHARITY                   184,800       No

Other names                                          33,428,733       No

Total                                                89,967,203       


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

1 August 2005


12

Total holding following this notification

89,967,203


13

Total percentage holding of issued class following this notification

13.91%


14

Any additional information

Total shares in issue 646,662,574


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

2 August 2005



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