Holding in Company

Tullow Oil PLC
14 March 2003

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES



1. Name of company


Tullow Oil Plc



2. Name of shareholder having a major interest


Lansdowne Partners



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






4. Name of the registered holder(s) and, if more than one holder, the number of
shares held by each of them


Lansdowne Partners Limited Partnership



5. Number of shares / amount of stock acquired






6. Percentage of issued class






7. Number of shares / amount of stock disposed






8. Percentage of issued class






9. Class of security


10p Ordinary Stock



10. Date of transaction









11 Date company informed


12/3/03



12. Total holding following this notification


14,236,302



13. Total percentage holding of issued class following this notification


3.78%



14. Any additional information


Update following recent placing



15. Name of contact and telephone number for queries


Tom Hickey

Tel: [phone]



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


Tom Hickey



Date of notification


14/3/2003







                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES



1. Name of company


Tullow Oil Plc



2. Name of shareholder having a major interest


Capital 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






4. Name of the registered holder(s) and, if more than one holder, the number of
shares held by each of them


State St Nominees



5. Number of shares / amount of stock acquired


n/a



6. Percentage of issued class


n/a



7. Number of shares / amount of stock disposed


N/a



8. Percentage of issued class


n/a



9. Class of security


10p Ordinary Stock



10. Date of transaction


n/a






11 Date company informed


13/3/03



12. Total holding following this notification


14,260,532



13. Total percentage holding of issued class following this notification


3.79%



14. Any additional information


Update following recent placing



15. Name of contact and telephone number for queries


Tom Hickey

Tel: [phone]



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


Tom Hickey



Date of notification


14/3/2003













                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES



1. Name of company


Tullow Oil Plc



2. Name of shareholder having a major interest


M&G Investments



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






4. Name of the registered holder(s) and, if more than one holder, the number of
shares held by each of them


Clydesdale Bank Nominees

     - 39,121,085

Other - 12,574,006



5. Number of shares / amount of stock acquired






6. Percentage of issued class






7. Number of shares / amount of stock disposed






8. Percentage of issued class






9. Class of security


10p Ordinary Stock



10. Date of transaction









11 Date company informed


13/3/03



12. Total holding following this notification


51,695,091



13. Total percentage holding of issued class following this notification


13.72%



14. Any additional information


Update following recent placing



15. Name of contact and telephone number for queries


Tom Hickey

Tel: [phone]



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


Tom Hickey



Date of notification


14/3/2003





This announcement has been issued through the Companies Announcement Service of

                           the Irish Stock Exchange.








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