Impax Asset Management Group plc Provides Operating Guidance for the Year Ended September 30, 2013

Impax Asset Management Group Plc is a United Kingdom-based specialist asset manager focused on investing in the opportunities arising from the transition to a sustainable global economy. The Company is focused particularly on investing in climate solutions. The Company seeks to invest in higher quality companies with strong business models that demonstrate sound management of risk. It offers a suite of investment solutions spanning multiple asset classes seeking superior risk-adjusted returns over the medium to long term. The Company's investment solutions include environmental markets, sustainability lens, gender lens, sustainable infrastructure and multi-asset. The Company's subsidiaries include Impax Asset Management Limited, Impax Asset Management (AIFM) Limited, Impax Asset Management LLC, INEI I GP (UK) LLP, INEI II GP (UK) LLP, Impax Asset Management (US) LLC, Impax Asset Management Japan Limited and Impax Global Opportunities (GP) Limited.