Holding(s) in Company

Impax Asset Management Group plc

Holdings in Company

Impax Asset Management Group plc ("Impax" or the "Company"), the AIM quoted investment manager focused on environmental markets and related resource efficiency sectors, today announces that Bruce Jenkyn-Jones has today notified the Company that he has exercised options over and sold 250,000 shares awarded pursuant to the Company's April 2011 option scheme at a price of 52 pence per share.

Following the disposal Bruce Jenkyn-Jones has a beneficial interest in 6.22 million shares (including 3.75 million vested shares within sub-funds of the Impax Group Employee Benefit Trust 2004) equating to 4.87 per cent. of the issued share capital of the Company.

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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: [email protected]

www.impaxam.com

Guy Wiehahn Tel: +44 (0) 20 7418 8893Nominated AdviserPeel Hunt LLP