Impax Asset Management

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Market Cap:
£759.02 m
582.00 GBX
52 weeks high
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Mission Statement

To generate superior, risk-adjusted investment returns from opportunities arising from the transition to a more sustainable economy for clients with a medium to long-term horizon.

In addition, to provide a stimulating, collaborative and supportive work-place for our staff,

And to make a contribution to the development of a sustainable society, particularly by supporting or undertaking relevant research and engaging or collaborating with others.


Be the solution

Our core focus and motivation is to offer solutions. It defines the investment approach we offer our clients, the contribution we make to the broader global community and the attitude we bring to work each day.

A Passion for excellence

We are passionate about our mission and our work. We strive for excellence in everything we do. We hold ourselves to high standards and trust each other to share these aspirations and contribute to the results.

All voices valued

We make better decisions if we are diverse and inclusive. All voices are welcomed and all voices are heard. We aspire to a dynamic culture that embraces change and inspires the evolution of new ideas.

Doing better together

We believe we can do far more, far better, working together as a team. True collaboration means treating others as we want to be treated. We value and respect our colleagues, clients and partners, their families and the wider community.  We are all interconnected and cannot hope to succeed alone.

Building a common future

We have a responsibility to promote prosperity while protecting the planet. We are committed to sustainable development, and to stewarding our environmental and societal impact for the benefit of current and future generations.

Investment Philosophy

  • We invest in companies and assets that are well positioned to benefit from the shift to a more sustainable global economy.

We believe that:

  • Capital markets will be shaped profoundly by global sustainability challenges, particularly climate change, environmental pollution, natural resource constraints, demographic and human capital issues such as diversity, inclusion and gender equity. 
  • These trends will drive growth for well-positioned companies and create risks for those unable or unwilling to adapt.
  • Fundamental analysis which incorporates long-term risks, including environmental, social and governance (ESG) factors, enhances investment decisions.

We invest in companies and assets that are:

  • Well positioned to benefit from the shift to a more sustainable global economy.

We offer:

  • A well-rounded suite of investment solutions spanning multiple asset classes seeking superior risk-adjusted returns over the medium to long-term.
  • We seek higher quality companies with strong business models that demonstrate sound management of risk.

Europe – London

Impax Asset Management Group plc head quarters
Portfolio management, Investment research, Client service and Corporate centre

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USA – New York Metro

Investment research and Client service for Impax branded products

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USA – Portland, Oregon

Client service for Impax and Pax branded investment products

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USA – Portsmouth, New Hampshire

Portfolio management, Investment research, Client service for Pax branded investment products

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Asia – Hong Kong

Investment research

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Keith Falconer

Keith was appointed Chairman of Impax Asset Management Group plc in January 2004.

After qualifying as a Chartered Accountant in 1979, he joined Martin Currie, the independent Edinburgh-based investment firm. The first part of his career was spent managing portfolios on behalf of institutional clients. Subsequently, he became the Managing Director of Sales and Marketing. He retired from Martin Currie at the end of 2003 and is now also Chairman of a number of other companies.


Ian Simm
Founder & CEO

Ian Simm is the Founder and Chief Executive of Impax Asset Management Group plc, which in 2018 celebrated its 20th anniversary and is today one of the world’s leading investment managers dedicated to investing in the transition to a more sustainable economy.

Impax currently manages ca. £16.1 billion in listed equity, private equity and fixed income strategies, primarily for institutional owners*. In 2014, the firm became the first investment manager to win the Queen’s Award for Sustainable Development.

Prior to Impax, Ian was an engagement manager at McKinsey & Company advising clients on environmental strategy. Between 2013 and 2018 Ian was also a board member of the Natural Environment Research Council (NERC), the UK’s leading funding agency for environmental science; he is currently a member of the Steering Committee of the UK’s Green Finance Institute. Ian has a first-class honours degree in physics from Cambridge University and a Master’s in Public Administration from Harvard University.

*As at 31 December 2019


Arnaud de Servigny
Non-Executive Director

Arnaud joined the board as a Non-Executive Director in June 2018 and is a member of the Remuneration Committee and the Audit & Risk Committee.

He currently holds non-executive directorships at BNP Paribas Asset Management France, Bramham Gardens Investments Limited, Bramham Gardens SARL and Fondation Pour l’Ecole. He was previously a Managing Director at Deutsche Bank Asset Management and has also worked at Barclays Wealth, Standard & Poors and BIM private equity fund. Arnaud has been a visiting Adjunct/ Professor of Finance at Imperial College Business School since 2005 and is the author of several books on finance, economics and investment management.


Sally Bridgeland
Non-Executive Director

Sally joined the board as a Non-Executive Director in July 2015 and is a member of the Remuneration Committee and the Audit and Risk Committee.

She is currently a non-executive director of Royal London, Lloyds Banking Group Pensions Trustees Limited and the Local Pensions Partnership Ltd and a trustee of the Nuclear Liabilities Fund, having worked in the UK pensions industry for 30 years. Originally qualifying as a Fellow of the Institute of Actuaries with consultants Bacon & Woodrow (now Aon Hewitt), she was CEO of the BP Pension Fund from 2007-2014.  Sally held a number of voluntary roles with the actuarial profession and was the first lady Master of the Worshipful Company of Actuaries 2016-17. 


Vince O’Brien
Non-Executive Director

Vincent O’Brien is a Non-Executive Director of Impax Asset Management Group plc and is a member of the Remuneration Committee and the Audit and Risk Committee.

He has worked in the private equity industry for over thirty years, twenty two of these as a director of Montagu Private Equity. Vince is a Chartered Accountant, he is currently chairing or advising a number of private equity companies including Quest Fund Placement and Nesta Impact Investments. He is a former chairman of the BVCA and served on its council for seven years.


Lindsey Brace Martinez
Non-Executive Director

Lindsey joined the Board as a Non-Executive Director in July 2015 and is a member of the Remuneration Committee and the Audit and Risk Committee.

Lindsey served as a member of the Executive team and was a Managing Director at Cambridge Associates. She held multiple roles during her 15-year tenure at the firm including Global Head of several areas covering Client Service and Relations, Business Development and Client Relationship Management, and Consulting.

She is the Founder and CEO, StarPoint Advisors, LLC, Member of the Advisory Board for the Yale Center for Business and the Environment, Member of the Investment Committee for the National Geographic Society, Chair of the Board, Novatus Energy LLC, Trustee of Pax World Funds Series Trust 1 and Board member of Seven Islands Land Company.

Lindsey holds an MBA (finance and strategy) and a Master of Environmental Studies from Yale University. 

She has 30 years’ experience in investment advisory, natural resources portfolio management, institutional marketing and sales, and management consultancy.


Charlie Ridge
Chief Financial Officer

Charlie began his career in 1987 and has considerable technical and management experience with blue chip investment banks.

Before joining Impax he was a Managing Director within the Finance Division of Deutsche Bank, most recently serving as UK Asset and Wealth Management CFO, and previously holding various financial and market risk related roles for the Global Markets Division. Before working at Deutsche, Charlie worked at SG Warburg and Ernst & Young as an Auditor.


Fiona Anderson
Global Head of HR

Fiona Anderson is Global Head of HR.

She began her career in 1992 and has considerable experience working in human resources, in areas such as talent development, recruitment, employee relations, business partnerships, compensation and benefits, and diversity and inclusion.

Before joining Impax in April 2019, Fiona was a Managing Director at Oaktree Capital where she led the International HR team and served as a member of the UK Executive Management Team. Before Oaktree she served as the HR Director and member of the Board of Cofunds (the UKs largest fund platform) between 2006 and 2010. Previous roles also include HR managerial roles at International Exchange, Commerzbank and BNY Mellon.

Fiona holds an MBA from Bangor University Wales and an MSc in Applied Positive Psychology from the University of East London.


Joseph Keefe
President of Impax Asset Management LLC

Joe is President of Impax Asset Management LLC and heads the Portsmouth office. He is responsible for Pax World Funds and its underlying strategies.

Prior to joining Pax in May 2005, Joe was President of NewCircle Communications, a strategic consulting and communications firm specialising in corporate social responsibility and public policy-oriented communications. He served as Senior Advisor for Strategic Social Policy at Calvert Group from 2003-2005 and as Executive Vice President and General Counsel of Citizens Advisers from 1997-2000. He is a former member of the Board of Directors (2000-2006) of US SIF, the trade association representing asset managers and investors engaged in sustainable investing throughout the United States. Before entering the investment management industry, Joe worked in private law practice for 16 years.

Joe holds a Bachelor of Arts in Philosophy from the College of the Holy Cross, and a Juris Doctor degree from the University of Virginia School of Law.


Bruce Jenkyn-Jones
Co-Head of Listed Equities, Executive Director

Bruce is an Executive Director and Co-Head of Listed Equities along with Hubert Aarts.

Together they are responsible for the development of the investment process, research and team. Bruce has an active role in the day to day management of all Impax listed equity portfolios and is on the portfolio construction team for all strategies. Bruce joined Impax in 1999 where he worked initially on venture capital investments before developing the listed equity business. Before joining Impax, Bruce worked as a utilities analyst at Bankers Trust and as an environmental consultant for Environmental Resources Management (ERM). Bruce has an MBA from IESE (Barcelona), an MSc in Environmental Technology from Imperial College and a degree in Chemistry from Oxford.  


Hubert Aarts
Co-Head of Listed Equities, Executive Director

Hubert is an Executive Director and Co-Head of Listed Equities, together with Bruce Jenkyn-Jones. He is also responsible as co-portfolio manager for Impax’s Leaders and Water strategies, as well as leading Impax’s macro-economic research process.

Hubert joined Impax in 2007 from Cambrian Capital Partners LLP, where he was a partner and portfolio manager of the Curalium fund and Incremental Leveraged hedge funds.

Having started his career in the investment industry in 1990, Hubert has extensive experience investing in Pan-European equities as a portfolio manager at MeesPierson and Merrill Lynch Investment Managers/BlackRock, where he chaired the European Sector Strategy Group.

He holds a Master’s degree in Economics and Business Administration from Maastricht University.


Daniel von Preyss
Head of Private Equity Infrastructure (Europe), Executive Director

Daniel joined Impax in 2009 and has primary responsibility for investments in Europe. Daniel is a member of the investments committee.

He is both involved in investments and is Head of Asset Management. Daniel has significant business and senior transactional experience with blue chip companies within the energy and utility sectors. Prior to joining Impax he was responsible for Babcock & Brown’s Northern European infrastructure activities where he focused on regulated utilities, gas storage and broader power generation.

Prior to this, Daniel was Director of Corporate Finance for the European Energy and Utilities team at Deutsche Bank with a strong focus on M&A activity in Europe and a member of Citigroup’s Utilities team.


David Richardson
Executive Director, Client Service & Business Development

David is an Executive Director, leading Client Service and Consultant Relations across Impax, as well as managing the Institutional Sales team in North America. David joined Impax in August 2012 from Global Energy Investors where he was a Managing Partner.

He previously co-founded and served for 22 years as Managing Director of Business Development at Dwight Asset Management Company (now part of Goldman Sachs Asset Management). Prior to Dwight, David headed Project Development at Mark Technologies Corporation and successfully led the financing and development of a number of large scale wind energy projects in the US. David received his BS in Mechanical Engineering from the University of California, is licensed as a Civil Engineer, and is a CFA® charterholder. David is a member of the Global Leadership Council and the Sustainable Investment Advisory Council of the World Resources Institute. He is also a member of the President’s Council for CERES.


Meg Brown
Executive Director, Marketing & Business Development

Meg leads marketing across Impax and manages the London-based sales and client service team covering UK, continental Europe and Asia. Meg also co-heads our impact investing work.

She has extensive experience in sustainable investing and research, having begun her career in 2002. As head of Citi’s top ranked Climate and Sustainable Investment Research team she worked with institutional and private clients across Europe on impact and responsible investment. Meg joined Impax in 2014 following a period as a consultant to private sector and not for profit clients in designing responsible investment strategies, including acting as the UK Liaison for the Global Impact Investing Network. Meg has a MSc in Environment and Development from the London School of Economics and is a non-executive director of the Carbon Tracker Initiative.


Zack Wilson
Group General Counsel, Executive Director

Zack serves as Group General Counsel for Impax Asset Management Group plc and is also Company Secretary. Prior to joining Impax in 2011, Zack was Director & General Counsel for the investment management and corporate finance advisory group Development Capital Management.

Previously he was Corporate Counsel for Telewest Global Inc (renamed Virgin Media Inc), where he played a leading role in managing the successful execution of high profile transactions including the Group’s $10bn financial restructuring. Zack qualified as a solicitor at the global law firm Norton Rose, specialising in Corporate Finance. He holds a Master of Arts in Jurisprudence from Oxford University.



General Enquiries

Email: [email protected]
Switchboard: +44 (0)20 3912 3000

Media Enquiries

Karen Wagg

Director of Communications

Tel: +44 (0)20 3912 3142
Mobile: +44 (0)77 2555 8551
Email: [email protected]

Montfort Communications

Tel: +44 (0)20 3514 0897
Email: [email protected]

Business Development Enquiries

Scott Thompson

Director, Business Development

Tel: +44 (0)20 3912 3137
Email: [email protected]


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