Investment Team

Arnaud Cosserat

Founding Partner, Chief Executive Officer
Portfolio Manager, European and Global Equity Strategies

Arnaud leads the firm’s executive committee and is a key decision maker on the European and Global equity strategies. He has over 30 years of experience in investing, specialising in European growth companies. He worked for Comgest for 27 years, from 1996 to 2023, where he was a lead portfolio manager of European equity strategies representing over €10bn of client assets. He was Chief Executive Officer of Comgest Global Investors from 2016-2023, Chief Investment Officer from 2015-2022 and an executive member of the group’s Board of Partners. He was also Chair of the Executive, Investment, and Sustainability Committees as well as the Comgest Foundation Board.

Arnaud started his career in 1989 as an Analyst at Banque Paribas, before joining Société de Bourse Oddo and then Generali as a Portfolio Manager. He holds a Master of Science degree from the ESSEC business school (France) and is a member of the French Society of Financial Analysts (SFAF, Société Française des Analystes Financiers).

Alistair Wittet

Founding Partner, Head of Investments,
Portfolio Manager, European and Global Strategies

Alistair leads the firm’s investment team and is a key decision maker on the European and Global equity strategies. He has over 18 years’ investment experience specialising in European growth companies.
He worked for Comgest from 2012-2024 where he was a lead Portfolio Manager of European strategies representing over €10bn of client assets. He was also a member of the Investment Committee and the Comgest Foundation Board. He started his career in 2006 at Standard Life Investments in Edinburgh before moving to London to join Citigroup in 2009.

A British and French national, Alistair has a degree in Geography from Durham University and is a CFA® charterholder. He is a Professor at HEC Paris Ecole de Commerce.

Sébastien Thévoux-Chabuel

Portfolio Manager, European Strategies
Corporate Culture Analyst

Sébastien analyses corporate culture and stakeholder ecosystems across companies held within the Aecus portfolios and he is a member of the European equity portfolio management team. He has over 26 years’ industry experience spanning portfolio management, sell-side company analysis and responsible investment. In addition to his portfolio management role, Sébastien leads the firm’s corporate culture research and shareholder engagement strategy.

Sébastien started his career in 1998 at DWS as a buy-side analyst specialising in technology companies before joining Crédit Agricole where he was a Portfolio Manager responsible for a global technology fund. After roles with ODDO Securities and Groupama Asset Management extending into the responsible investment domain, he became Head of Responsible Investment at Comgest from 2013-2024 and was a co-lead Portfolio Manager of several European and Global equity portfolios. He was also a member of Comgest’s Investment and Sustainability Committees.

A French national, Sébastien graduated from the ESCP Business School in Paris in 1997, holds a post-graduate degree in financial engineering at Sorbonne University and is a SFAF (Société Française des Analystes Financiers) charterholder. He is completing an Executive PhD at Dauphine PSL focusing on “effective shareholder engagement” and teaches Sustainable Finance at a number of Paris business schools.

Business Team

Jane Russell

Founding Partner,
Head of Investor Relations and Strategy

Jane leads the firm’s commercial activities and strategic development. She has worked in the industry for over 25 years in roles spanning investor relations, business development, marketing, accounting and finance with firms including Comgest, Antin Infrastructure Partners, Warakirri Asset Management and PricewaterhouseCoopers.
She worked with Comgest for over 10 years where she held roles including Head of Responsible Development, Global Consultant Relations, UK and US Investor Relations as well as contributing as a member of the firm’s Sustainability, DEI and Editorial Committees.

Jane is a dual Australian and French citizen. She graduated from the University of Melbourne and is a Chartered Accountant (CA ANZ).

Helen Lowdon

Founding Partner,
Head of Operations

Helen leads the firm’s internal and fund operations. She has 15 years experience in the investment management industry across a number of operational roles. Helen worked for Comgest from 2010 to 2024 where she was Chief of Staff to the CIO, managing the Investment Solutions and Analytics team and working alongside the firm’s investment teams. She was responsible for the external research budget, was co-Chair of the firm’s Investment Committee and was an advisor to the board of Comgest Growth Plc in Ireland. Prior to this role, she worked within Comgest’s Investor Services team, responsible for client communications and reporting, performance measurement and database management.

Helen started her career in project management and communications with roles at France Telecom and Société Générale. A dual British and French citizen, she holds a degree in French from Oxford University and a Master’s degree in International Project Management from the ESCP business school in Paris.