Re: Schedule 5

Tullow Oil PLC
06 May 2005

                                   SCHEDULE 5

                        BLOCKLISTING SIX MONTHLY RETURN



1. Name of company



   Tullow Oil plc


2. Name of schemes



   Tullow Oil 1988 Executive Share Option Scheme ('1988 Scheme')

   Tullow Oil 1998 Executive Share option Scheme ('1998 Scheme')

   Tullow Oil 2000 Executive Share option Scheme ('2000 Scheme')

3. Period of return: From 5 November 2004 to 4 May 2005


4. Number and class of shares(s)
   (amount of stock/debt security)
   not issued under schemes at end

   of last period



   5,960,945 ordinary shares of 10p each


5. Number of shares issued/allotted
   under schemes during period



   1,018,618 - 1988 Scheme

     732,617 - 1998 Scheme

     975,771 - 2000 Scheme


6. Balance under schemes not yet issued/allotted
   at end of period



 1,208,549  - 1988 Scheme

   949,161  - 1998 Scheme

 1,076,229  - 2000 Scheme


7. Number and class of share(s)
   (amount of stock/debt securities)
   originally listed and the date of admission



2,200,000 Ordinary shares of 10p each admitted on 5 November 2003

1,700,000 Ordinary shares of 10p each admitted on 9 June 2004

5,000,000 Ordinary shares of 10p each admitted on 11 October 2004



Please confirm total number of shares in issue at the end of the period
in order for us to update our records



646,429,868

Contact for queries:    Richard Taylor



Telephone: [phone]







This announcement has been issued through the Companies Announcement Service of

                           the Irish Stock Exchange.




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