EBT Share Purchase

17 December 2012

Impax Asset Management Group plc (the 'Company')

EBT Share Purchase

The Company has been notified by Sanne Trust Company Limited, the trustees of the Impax Asset Management Group plc Employee Benefit Trust 2012 (the "EBT"), that on 14 December 2012 the EBT purchased 500,000 ordinary shares in the Company at a price of 33.25 pence per share.

Following this purchase, the EBT holds 17,640,667 ordinary shares, representing 13.81% of the Company's current voting rights.

Enquiries: 

Impax Asset Management Group plc

Ian Simm, Chief Executive 020 7434 1122

Anne Gilding Head of Brand Communications Tel: +44 (0) 20 7432 2602

Mobile: +44 (0) 7881 249612 (mobile)

Email: [email protected]

www.impaxam.com

Execution Noble

John Riddell, Director 020 7456 9191