United StatesLondon, 6 January 2026 – Impax Asset Management (“Impax”), the specialist investor focused on the transition to a more sustainable economy, today announced the appointment of Stuart White as Executive Director, Business Development.
In this newly created role, Stuart will be responsible for co-ordinating the implementation of the company’s strategy and business development, for initiating and managing client partnerships and for leading the further evolution of Impax’s systematic equities commercial strategy. Stuart, who joined on 2 January and is based in London, reports to Impax’s Founder and Chief Executive, Ian Simm, and will sit on Impax’s Management Committee.
Stuart joins from HSBC Asset Management, where he spent the last five years as Chief Executive Officer, UK, leading a business unit with c. £150 billion of assets under management. During his 15-year career at the company he held a number of roles, including: Chief Executive Officer, International; Global Head of Strategy, M&A and Chief of Staff; and Head of UK Institutional. Previously he held senior business development roles at Insight Investment and Threadneedle Investments. Stuart is a Non-Executive Board Director of the National Employment Saving Trust Corporation (NEST), the UK Government’s workplace pension scheme.
Ian Simm, Founder and Chief Executive, Impax Asset Management, said: “Stuart is an impressive professional, with proven experience in driving profitable business growth and developing strategic partnerships across both institutional and wholesale client segments. His background also makes him an ideal leader to spearhead our strategy to grow our systematic equities product suite, an area where we are seeing increasing interest from clients.”
Commenting on his appointment, Stuart White commented: “I’m thrilled to join Impax, and look forward to working with Ian and the team on expanding the business, evolving our partnerships with clients and developing investment capabilities. I’ve long admired Impax for its leadership in understanding the transition to a more sustainable economy and its heritage in investment management; it now has a tremendous potential to expand.”
About Impax Asset Management
Founded in 1998 and with £26.1 billion of assets under management and approximately 100 investment professionals within listed equities, fixed income and private markets, Impax is one of the largest specialist investors focused on the transition to a more sustainable economy.1
We believe strong investment returns can be generated by investors who better understand the opportunities and risks associated with forces shaping the future, including resource constraints, policy and regulation, technological innovation, and evolving social trends.
We believe these trends are reshaping capital markets: driving growth for well-positioned companies and creating risks for those unable or unwilling to adapt. Our investment approach seeks out high-quality companies and issuers with enduring business models and sound risk management, aiming to deliver strong outcomes for our clients over the medium to long term.
1. Data as at 30 September 2025
Contacts
Lansons
Louise Marriott
Ronan Friel
impax@lansons.com
+44 (0)20 7418 8900