Recommendation to Trustees of EBT

Impax Asset Management Group plc

Recommendation to Trustees of EBT

Impax Asset Management Group plc (the "Company" or "Impax") announces that prior to entering into a close period, ahead of the release its interim results for the six month period ended 31 March 2018 on Thursday 7 June 2018, it 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 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 12,203,808 Impax Shares and the Impax Group Employee Benefit Trust 2004 owns 15,388,353 Impax Shares. In aggregate they own 27,592,161 Impax Shares.

The total number of voting rights in Impax is 130,415,087.

LEI number: 213800AJDNW4S2B7E680

-ENDS-

Enquiries:

Ian Simm

Chief Executive Tel: +44 (0) 20 3912 3000 (switchboard)

Impax Asset Management Group plc

7th floor, 30 Panton Street

London SW1Y 4AJ

www.impaxam.com

Anne Gilding Tel: +44 (0) 20 3912 3000 (switchboard)

Head of Brand & Communications Tel: +44 (0) 20 3912 3126 (direct)

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

7th floor, 30 Panton Street

London SW1Y 4AJ

www.impaxam.com Email: a.gilding@impaxam.com

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