Posting of Interim Results

11 June 2012

Impax Asset Management Group plc

('Impax' or the 'Company')

Posting of Interim Results

The Directors of Impax announce that copies of the Company's interim results for the six months ended 31 March 2012 have been distributed to shareholders.

An electronic copy of the interim results is available from the Company's website at http://www.impaxam.com/investor-relations/reports-and-presentations

Enquiries:

Impax Asset Management Group plc 020 7434 1122

Ian Simm, Chief Executive

Execution Noble & Co Limited 020 7456 9191

John Riddell

James Bromhead