Director/PDMR Shareholding

27 March 2015

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

Director Shareholding

The Company has been informed today of the following transactions. Ian Simm, Chief Executive Officer, has been gifted for nil consideration 40,000 Ordinary Shares by his wife, Helen Dell. Mr Simm has invested 28,692 Ordinary Shares into his ISA and sold a further 157 shares to cover the cost of the transaction. His wife has invested 28,692 Ordinary Shares (held in her own name) into her ISA and also sold a further 157 shares to cover the cost of the transaction.

Following these transactions, Mr Simm's interest and that of his connected persons in Ordinary Shares is 9,485,947 Ordinary Shares representing 7.4% of the total issued share capital of the Company.

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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 Adviser and BrokerPeel Hunt LLP