Bowleven Regulatory News (BLVN)

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:

Bowleven 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

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 the notification obligation:

JPMorgan Asset Management Holdings Inc.

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

JPMorgan Asset Management (UK) Limited 

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

 20 August 2009

6. Date on which issuer notified:

 24 August 2009

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

 10% upwards

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

 GB00B04PYL99

 4,564,718

 4,564,718

18,017,689 

9.34% 

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

Contract for Difference

 1,544,283

Nominal

Delta

 0.80%

Total (A+B+C)

Number of voting rights

Percentage of voting rights

 19,561,972

 10.14%

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

Total disclosable holding for JPMorgan Asset Management Holdings Inc: 19,561,972 (10.14%)

JPMorgan Asset Management (UK) Limited: 19,561,972 (10.14%)

Proxy Voting:

10. Name of the proxy holder:

 N/A

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

 N/A

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

 N/A

13. Additional information:

 N/A

14. Contact name:

 Miss Jay Supaya

15. Contact telephone number:

 020 7325 4513