Holding(s) in Company

Rockhopper Exploration plc
19 November 2007



19 November 2007

Rockhopper Exploration PLC ('the Company')



                             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:

MF Global UK 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):

15 November 2007

6. Date on which issuer notified:

16 November 2007

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

5%

8. Notified details:

A: Voting rights attached to shares

Class/type of shares if possible           Situation previous to the Triggering transaction (vi)
using the ISIN CODE
                                  Number of shares                   Number of voting Rights (viii)
GB00B0FVQX23                      3,790,317                          3,790,317



Resulting situation after the triggering transaction (vii)


Class/type of shares if       Number of shares      Number of voting rights (ix)     % of voting rights
possible using the ISIN CODE
                              Direct                Direct (x)       Indirect        Direct      Indirect
                              3,718,317             3,718,317                        4.91        N/A
GB00B0FVQX23                                                         N/A




B: Financial Instruments

Resulting situation after the triggering transaction (xii)


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



Total (A+B)
Number of voting rights        % of voting rights
3,718,317                      4.91%



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

N/A



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:

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 Limited                                www.aquila-financial.com
Peter Reilly                                                       020 7202 2601


                      This information is provided by RNS
            The company news service from the London Stock Exchange      HOLEAEFPFFNXFAE