Holding(s) in Company

Impax Environmental Markets plc has today received the following
notification of a major interest in its shares.

TR-1(i): NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Identity of the issuer or the underlying issuer of existing shares
to which voting rights are attached (ii):
Impax Environmental Markets Plc

2. Reason for the notification (please state Yes/No): (    ) n/a see
additional information

An acquisition or disposal of voting rights: (Yes)

An acquisition or disposal of financial instruments which may result
in the acquisition of shares already issued to which voting rights
are attached: (No)

An event changing the breakdown of voting rights: (No)

Other (please specify) : (No)

3. Full name of person(s) subject to the notification obligation
(iii):
Rathbone Brothers Plc

4. Full name of shareholder(s) (if different from 3.) (iv):
Rathbone Brothers Plc
Rathbone Investment Management Ltd

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

6. Date on which issuer notified:
16 May 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
using the ISIN CODE                        transaction (vi)
                                 Number of shares   Number of voting
                                                    Rights (viii)


Ord 10p shares                   9,949,974          9,949,974
GB0031232498



Resulting situation after the triggering transaction (vii)


Class/type of       Number of Number of voting rights % of voting
shares if possible  shares    (ix)                    rights
using the ISIN CODE
                    Direct    Direct   Indirect (xi)  Direct Indirect
                              (x)


Ord 10p shares      N/A       N/A      10,009,574     N/A    5.00%
GB0031232498


B: Financial Instruments
Resulting situation after the triggering transaction (xii)


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



Total (A+B)

Number of voting rights % of voting rights
10,009,574              5.00%


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

Rathbone Brothers Plc*
Rathbone Investment Management Ltd      5.00%
* Rathbone Brothers Plc is the holding company of the following





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:
Compliance Department

15. Contact telephone number:
020 7399 000



The person making this annoucement on behalf of Impax Environmental
Markets plc is as follows;

Anthony Lee
Tel: [phone]

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