Impax Asset Management Regulatory News (IPX)

For filings with the FSA incude the annex

For filings with issuer exclude the annex

TR-1: NOTIFICATION OF MAJOR INTERES IN SHARES

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

Impax Asset Management Group PLC

2 Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

√

An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (please specify):

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

Australian Ethical Investment Ltd, as responsible entity for the Australian Ethical International Equities Trust

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

As above

5. Date of the transaction and date on which the threshold is crossed or reached: v

19 March 2010

6. Date on which issuer notified:

24 March 2010

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

Ceasing to be a major shareholder. Disposal of shareholding of 4.4% of shares outstanding.

8. Notified details:

A: Voting rights attached to shares viii, ix

Class/type of shares

if possible using the ISIN CODE

Situation previous to the triggering transaction

Resulting situation after the triggering transaction

Number of Shares

Number of Voting Rights

Number of shares

Number of voting rights

% of voting rights x

Direct

Direct xi

Indirect xii

Direct

Indirect

GB0004905260

5057143

5057143

0

0

0

0%

0%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date xiii

Exercise/ Conversion Period xiv

Number of voting rights that may be acquired if the instrument is exercised/ converted.

% of voting rights

n/a

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv, xvi

Resulting situation after the triggering transaction

Type of financial instrument

Exercise price

Expiration date xvii

Exercise/ Conversion period xviii

Number of voting rights instrument refers to

% of voting rights xix, xx

n/a

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

0

0%

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

n/a share holding sold.

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:

15. Contact telephone number:

Note: Annex should only be submitted to the FSA not the issuer

Annex: Notification of major interests in share

A: Identity of the persons or legal entity subject to the notification obligation

Full name

(including legal form of legal entities)

Australian Ethical Investment Ltd, as responsible entity for the Australian Ethical International Equities Trust

Contact address

(registered office for legal entities)

GPO Box 2435

Canberra, ACT, 2600

Australia

Phone number & email

061 2 62011908

utonkin@australianethical.com.au

Other useful information

(at least legal representative for legal persons)

B: Identity of the notifier, if applicable

Full name

Contact address

Phone number & email

Other useful information

(e.g. functional relationship with the person or legal entity subject to the notification obligation)

C: Additional information

For notes on how to complete form TR-1 please see the FSA website.