Ian Simm

Ian Simm is a British businessman and the founder and chief executive officer (CEO) of Impax Asset Management, an investment firm focused on the transition to a more sustainable economy.

Early life and education Ian Simm was born in West Yorkshire in 1966 and educated at a state school. He went on to study natural sciences at Cambridge University, where he specialised in physics, and graduated with first-class honours in 1988. While at Cambridge, he ran the university’s expedition society and developed an interest in environmental issues after reading Our Common Future (1987), the influential report by former Norwegian prime minister Gro Harlem Brundtland that popularized the term "sustainable development". His early career included environmental consultancy, an expedition to West Africa to track vegetation on the edge of the Sahara Desert (during which he contracted malaria and led an expedition to cross the Sahara on a tandem bicycle) and an attempt to launch a solar lighting business in South Africa.

Career With a mandate from the World Bank to help it design and run a solar energy investment fund, Simm founded Impax Asset Management in 1998. Impax listed on the London Stock Exchange in 2001 and formally partnered with FTSE to expand its range of environmental indexes in 2008.

The company grew steadily under Simm's guidance.

In later years, Simm has frequently represented Impax in the financial press, outlining its investment philosophy, defending its strategy during periods of volatility, and articulating the case for investing in resource efficiency and sustainability.

Views and advocacy In a 2021 profile, Simm argued that investing in companies addressing environmental challenges provided a compelling business case, apart from any notion of ethics.

Board and advisory roles Simm holds a number of roles outside his executive work at Impax. He is a member of the UK government’s Net Zero Council, which advises the government on its low carbon objectives, and the Net Zero Innovation Board, which oversees public sector funding of energy innovation programmes. He also serves on the board of the Institutional Investors Group on Climate Change (IIGCC) He is a commissioner with the Energy Transitions Commission, a global coalition developing roadmaps to net-zero emissions, and he chairs the Net Zero Committee of the Confederation of British Industry.

Between 2013 and 2018, Simm was a board member of the Natural Environment Research Council (NERC), the UK’s principal public funder of environmental science. He also served s a Commissioner with the Severn Estuary Commission.

Recognition At the Financial News Asset Management Awards 2020, Simm was named Industry Leader of the Year. In 2024, Financial News included Simm in its list of the Most Influential in Sustainable Finance, naming him as one of six European leaders in the field.

Personal life Simm lives in London. He is married and has two children.