Holding(s) in Company

RNS Number : 6167L

Tullow Oil PLC

02 August 2011

TR-1(i): NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached :

TULLOW OIL PLC

2. Reason for the notification (please tick the appropriate box or boxes)

An acquisition or disposal of voting rights: ( )

An acquisition or disposal of financial instruments which may result in the acquisition of shares already issued to which voting rights are attached: ( )

An event changing the breakdown of voting rights: ( )

Other (please specify): ( X )

Update to Total Voting Rights figure triggered this notification.

3. Full name of person(s) subject to the notification obligation :

Prudential plc group of companies

4. Full name of shareholder(s) (if different from 3.):

See attached Schedule

5. Date of the transaction (and date on which the threshold is crossed or reached if different):

1 August 2011

6. Date on which issuer notified:

2 August 2011

7. Threshold(s) that is/are crossed or reached:

See item 13.

8. Notified details:

A: Voting rights attached to shares

Class/type of shares if possible using the ISIN CODE	Situation previous to the Triggering transaction
Ord 10p GB0001500809	Number of shares 61,418,503	Number of voting Rights 61,418,503

Resulting situation after the triggering transaction
Class/type of shares if possible using the ISIN CODE	Number of shares	Number of voting rights		% of voting rights
		Direct	Indirect	Direct	Indirect
Ord 10p GB0001500809	61,418,503	60,730,632	687,871	6.79%	0.00%

B: Financial Instruments

Resulting situation after the triggering transaction (xii)

Type of financial instrument	Expiration Date (xiii)	Exercise/Conversion Period/ Date (xiv)	Number of voting rights that may be acquired if the instrument is exercised/ converted.	% of voting rights