Holding(s) in Company

Tullow Oil PLC
22 January 2007


TULLOW OIL PLC

NOTIFICATION OF MAJOR INTERESTS IN SHARES


1. Name of company

Tullow Oil plc


2. Name of shareholder having a major interest

BlackRock Group


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 Shares         Beneficial Interest
Nutraco Nominees Limited                                             52,914,295               No
Stamford Nominees Limited A/C CHARTY                                 165,400                  No
Treasury of the Government of the Isle of Man Nominees A/C 5         894,880                  No
Treasury of the Government of the Isle of Man Nominees A/C 10        2,234,359                No
BlackRock Pensions Nominees Ltd                                      182,386                  Yes
BlackRock Pensions Nominees Ltd A/C Noncert                          5,278,128                Yes
Other names                                                          46,077,371               No
Total                                                                107,746,819

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

22 January 2007

12. Total holding following this notification

107,746,819

13. Total percentage holding of issued class following this notification

15.025%

14. Any additional information

N/A

15. Name of contact and telephone number for queries

Tom Hickey 208 996 1000

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

Richard Taylor

Date of notification
22 January 2007


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