Holding(s) in Company

For filings with the FCA include the annex

For filings with issuer exclude the annex

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

1. Identity of the issuer or the underlying issuerof existing shares to which voting rights areattached:

Tullow Oil Plc

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

An acquisition or disposal of voting rights

X

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

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (please specify):

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

Prudential plc group of companies

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

Prudential plc

M&G Group Limited

M&G Limited

M&G Investment Management Limited

5. Date of the transaction and date onwhich the threshold is crossed orreached:

12 December 2016

6. Date on which issuer notified:

13 December 2016

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

See item 13

8. Notified details:

A: Voting rights attached to shares

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights

Direct

Direct

Indirect

Direct

Indirect

ORD GBP0.10

GB0001500809

45,958,307

45,958,307

45,809,457

0

45,809,457

0

5.02%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate

Exercise/Conversion Period

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Exercise price

Expiration date

Exercise/Conversion period

Number of voting rights instrument refers to

% of voting rights

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

45,809,457

5.02%

9. Chain of controlled undertakings through which the voting rights and/or thefinancial instruments are effectively held, if applicable:

Prudential plc (parent Company) - 45,809,457 (5.02%)

M&G Group Limited (wholly owned subsidiary of Prudential plc) - 45,606,692 (4.99%)

M&G Limited (wholly owned subsidiary of M&G Group Limited) - 45,606,692 (4.99%)

M&G Investment Management Limited (wholly owned subsidiary of M&G Limited) - 45,606,692 (4.99%)

Proxy Voting:

10. Name of the proxy holder:

N/A

11. Number of voting rights proxy holder will ceaseto hold:

N/A

12. Date on which proxy holder will cease to holdvoting rights:

N/A

13. Additional information:

The following entities have triggered a notification, moving below a 5% indirect notifiable interest:

M&G Group Limited (wholly owned subsidiary of Prudential plc)

M&G Limited (wholly owned subsidiary of M&G Group Limited)

M&G Investment Management Limited (wholly owned subsidiary of M&G Limited)

14. Contact name:

Kevin MassieCorporate Counsel & Company SecretaryTullow Oil plc

15. Contact telephone number:

020 3249 9000