Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

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

Premier Oil plc

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

An acquisition or disposal of voting rights

Yes 

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

No 

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

No 

An event changing the breakdown of voting rights

No

Other (please specify):

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

BlackRock Inc

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

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

1 December 2009

6. Date on which issuer notified:

3 December 2009

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

Going above 10%

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

Resulting situation after the triggering transaction

Number of Shares

Number of Voting Rights

Number of shares

Number of voting rights

% of voting rights

Direct

Direct

Indirect

Direct

Indirect

GB0033560011

5,997,406

5,997,406

N/A

N/A

12,136,693 

 N/A

10.58%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date

Exercise/ Conversion Period

Number of voting rights that may be acquired if the instrument is exercised/ converted.

% of voting rights

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

Resulting situation after the triggering transaction

Type of financial instrument

Exercise price

Expiration date

Exercise/ Conversion period

Number of voting rights instrument refers to

% of voting rights

CFD

N/A

N/A

N/A

211,347

Nominal

Delta

0.19%

Total (A+B+C)

Number of voting rights

Percentage of voting rights

 12,348,040

 10.77%

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

BlackRock Investment Management (UK) Limited - 12,348,040 (10.77%)

On 1 December 2009, the Barclays Global Investors (BGI) business was acquired by BlackRock Inc. The combined holdings of BlackRock Inc. Following this acquisition triggered this disclosure requirement.

Proxy Voting:

10. Name of the proxy holder:

11. Number of voting rights proxy holder will cease to hold:

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

13. Additional information:

14. Contact name:

Heather Garratt

15. Contact telephone number:

0207 730 1111