Holding(s) in Company

Impax Group PLC
04 June 2007


TR-1:     NOTIFICATION OF MAJOR INTERESTS IN SHARES 

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

2. Reason for the notification     (please tick the appropriate box or boxes)
An acquisition or disposal of voting rights                                                   X
An acquisition or disposal of financial instruments which may result in the
acquisition of shares already issued to which voting rights are attached
An event changing the breakdown of voting rights
Other (please specify):

3. Full name of person(s) subject to the                  Australian Ethical Investment Ltd
notification obligation:

4. Full name of shareholder(s) (if different
from 3.):
                                                               Royal Bank of Canada ACF

                                                        Australian Ethical Investment Ltd SRE

                                                          Australian Ethical Equities Trust

5. Date of the transaction (and date on which                        18 May 2007
the threshold is crossed or reached if
different):

6. Date on which issuer notified:                                    23 May 2007

7. Threshold(s) that is/are crossed or                                    3%
reached:
8. Notified details:


A: Voting rights attached to shares
Class/type of     Situation previous to   Resulting situation after the triggering transaction(i)
shares            the Triggering
                  transaction
 if possible      Number of   Number of   Number of       Number of voting rights % of voting rights
using the ISIN    Shares      Voting      shares
CODE                          Rights      Direct          Direct      Indirect    Direct    Indirect

GB0004905260      1,500,000   1,500,000   4,607,143       4,607,143               4.27%


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

Total (A+B)
Number of voting rights                               % of voting rights

4,607,143                                             4.27 %
   

9. Chain of controlled undertakings through which the voting rights and/or the financial
   instruments are effectively held, if applicable:
   
   None



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:                   Jacqueline Brown
15. Contact telephone number:       020 7434 1122

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