Holding(s) in Company

Tullow Oil PLC
14 September 2004

                                  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 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 of Beneficial
of shares Interests?

(Yes/No)

Nutraco Nominees Limited 38,485,769 No

Merrill Lynch Pension Nominees Ltd 5,610,070 Yes

A/C NONCERT

Treasury of the Government of 1,351,397 No

Isle of Man A/C5

Treasury of the Government of 629,946 No

Isle of Man A/C 10

Nortrust Nominees Limited 3,754,081 No

Chase Nominees Limited 4,740,000 No

Morgan Nominees Limited 1,735,586 No

Bank of New York Nominees Limited 1,007,809 No

Other names 12,993,226 No

5. Number of shares / amount of stock acquired




6. Percentage of issued class




7. Number of shares / amount of stock disposed
6,609,449 since SAR 1 June 2004

8. Percentage of issued class
1.03%

9. Class of security
Ordinary 10p shares

10. Date of transaction




11. Date company informed
13 September 2004

12. Total holding following this notification
70,307,884

13. Total percentage holding of issued class following this notification
10.95%

14. Any additional information
Total shares in issue 641,822,129

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
14 September 2004

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