Recommendation to Trustees of EBT

8 September 2016

Impax Asset Management Group plc ('Impax' or the 'Company')

Recommendation to Trustees of EBT

The Company announces that it has provided a recommendation to Sanne Fiduciary Services Limited, the independent trustee of the Impax Asset Management Group plc Employee Benefit Trust 2012, to continue to acquire Impax Ordinary Shares of 1p each ("Impax Shares") in the market to satisfy share awards to employees.

The recommendation expires upon the publication of the Company's results for the year ended 30 September 2016. The recommendation is subject to a pre-agreed maximum price and general availability of Impax Shares in the market.

Given the low levels of liquidity in Impax Shares, the EBT may be the largest purchaser of Impax Shares on any given day.

As at the date of this announcement the Impax Asset Management Group plc Employee Benefit Trust 2012 owns 19,999,566 Impax Shares and the Impax Group Employee Benefit Trust 2004 owns 15,388,353 Impax Shares. In aggregate they own 35,387,919 Impax Shares.

The total number of voting rights in Impax is 127,749,098.

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Enquiries:

Ian Simm Tel: + 44 (0) 20 7434 1122 (switchboard)

Chief Executive

Impax Asset Management Group plc

Norfolk House, 31 St James's Square,

London, SW1Y 4JR

www.impaxam.com

Anne Gilding Tel: +44 (0) 20 7434 1122 (switchboard)

Head of Brand & Communications Tel: +44 (0) 20 7432 2602 (direct)

Impax Asset Management Group plc Tel: +44 (0) 7881 249612 (mobile)

Norfolk House, 31 St James's Square,

London, SW1Y 4JR Email: a.gilding@impaxam.com

www.impaxam.com

Guy Wiehahn / Rishi Shah Tel: +44 (0) 20 7418 8893Nominated Adviser and BrokerPeel Hunt LLP