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Ian Simm, portrait

Ian Simm

Director, Chief Executive Officer at Impax Asset Management

Firm officerUpdated

Ian Simm has been Director, Chief Executive Officer of Impax Asset Management, LTD., a London, United Kingdom investment adviser managing $25.8B, since August 1998.

28
Years in role
$25.8B
Firm AUM
686
Firm clients
53
Firm advisers

From Form ADV filed 22 December 2025Form ADV

Career

Ian Simm is a control person of Impax Asset Management and directly owns under 5% of it. Ian Simm holds a First-class honours degree in Physics from Cambridge University and a Master's in Public Administration from Harvard University.

Impax Asset Management is an investment adviser based in London, United Kingdom, registered with the SEC since 2008. It provides investment management. Its clients include pooled investment vehicles, investment companies and other investment advisers. Its regulatory assets under management total $25.8 billion, as filed on 22 December 2025. Its fees, ownership and offices are on the firm’s profile.

Ian Simm is Founder and Chief Executive of Impax Asset Management Group plc, an investment manager focused on the transition to a more sustainable economy, with offices and clients in Europe, North America and the Asia-Pacific region. Outside Impax he is a member of the UK government's Net Zero Council and of the Trustee Body for the Cambridge University Endowment Fund. Before Impax he was an engagement manager at McKinsey & Company advising clients on environmental strategy.

Key facts

CRD
5298088
Firm
Impax Asset Management · CRD 143247
Role
Director, Chief Executive Officer
In role since
August 1998 · 28 years
Control person
Yes
Direct ownership
Under 5%
Firm headquarters
London, United Kingdom
Individual registration
No current adviser record · SEC search
Disciplinary history
Not yet shown here · SEC record
Firm bio
impaxam.com

Common questions

Where does Ian Simm work?

Ian Simm has been Director, Chief Executive Officer of Impax Asset Management, LTD. since August 1998, and is a control person of the firm.

Source: Form ADV, Schedule A, filed 22 December 2025

How can I verify Ian Simm’s record?

Ian Simm’s role is listed on Impax Asset Management, LTD.’s Form ADV, which the SEC’s adviser search (adviserinfo.sec.gov) publishes under the firm’s CRD 143247.

Source: Form ADV, Schedule A, filed 22 December 2025

Leadership at Impax Asset Management

Sources

  1. IAPD individual lookup, CRD 5298088, checked 21 October 2026. This profile uses the Form ADV officer listing; the individual lookup did not provide a current investment-adviser record.
  2. Form ADV Part 1A, Schedules A and B of Impax Asset Management, LTD., filed 22 December 2025. Title, control and ownership bands.
  3. Impax Asset Management team page. Biography, education, credentials, awards and the portrait, reproduced for identification.