Holding(s) in Company

Rockhopper Exploration plc
15 June 2007


                                                                             


Rockhopper Exploration PLC ('the Company')


June 15, 2007


                              Notifiable Interest


A form TR-1 containing the following information has been received by the
Company.

TR-1 notification of major interests in shares


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


2. Reason for the notification

An acquisition or disposal of voting rights


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

Man Financial Limited


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

N/A


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

12 June 2007


6. Date on which issuer notified:

13 June 2007


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

5%


8. Notified details:


A: Voting rights attached to shares
Class/type   Situation previous to     Resulting situation after the triggering
of shares    Triggering transaction    transaction
if possible                            Notification required under DTR transitional
using ISIN                             provision 7
CODE         Number of    Number of    Number of    Number of voting      % of voting
             Shares       Voting       shares       rights                rights
                          Rights       Direct       Direct       Indirect Direct  Indirect

GB00B0FVQX23 2,994,215    2,994,215    3,790,317    3,790,317   N/A       5.01   N/A


B: Financial Instruments
Resulting situation after the triggering transaction
Type of     Expiration Exercise/     Number of voting rights that may   % of
financial   date       Conversion    be acquired if the instrument is   voting
instrument             Period/ Date  exercised/ converted               rights
N/A         N/A        N/A           N/A                                N/A


Total (A+B)
Number of voting rights                      % of voting rights
        3,790,317                                5.01


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

N/A


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:

N/A


15. Contact telephone number:

N/A


For further information, please contact:


Rockhopper Exploration plc www.rockhopperexploration.co.uk

Sam Moody - Managing Director 01722 414 419


Aquila Financial Ltd www.aquila-financial.com

Peter Reilly 020 7202 2601




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