Director/PDMR Shareholding

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

Director Shareholding

The Company has been informed today of the following transactions by Ian Simm, Chief Executive Officer. Mr Simm has transferred 24,061 Ordinary Shares (held in his own name) into his ISA and sold a further 90 Ordinary Shares to cover the cost of the transaction.

His wife, Helen Dell, has transferred 31,164 Ordinary Shares (held in her own name) into her ISA and sold a further 89 Ordinary Shares to cover the cost of the transaction. Helen Dell has also re-invested dividends received from Ordinary Shares held in her ISA by acquiring 234 Ordinary Shares.

Following these transactions, Mr Simm's interest and that of his connected persons in Ordinary Shares is 9,486,002 Ordinary Shares representing 7.4% of the total issued share capital of the Company.

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Zack Wilson

Group General Counsel and Company Secretary Tel: + 44 (0) 20 7434 1122 (switchboard)

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