Holding(s) in Company

Rockhopper Exploration plc
04 March 2008


                   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):

28 February 2008

6. Date on which issuer notified:

29 February 2008

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  3,718,317    3,718,317    3,803,317    3,803,317   N/A       5.03%  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
      3,803,317                                5.03%

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 Limited           www.aquila-financial.com
Peter Reilly                       0118 979 4100




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