Impax Asset Management (Aifm) Ltd.
- Regulatory AUM
- $2.0B
- Discretionary
- $2.0B
- Clients
- 4
- Avg AUM / client
- $501M
- Accounts
- 4
- Employees
- 165
AUM over time
Annual snapshots from Form ADV filings · as of Jul 30, 2026
Who they serve
| Client type | Clients | AUM | % of AUM |
|---|---|---|---|
| Pooled investment vehicles (non-investment companies) | 4 | $2.0B | 100.0% |
Private funds (4)
Reported in Form ADV Section 7.B.(1), filing of Dec 2024 · $425M combined gross assets
| Fund | Type | Domicile | Gross assets | Owners |
|---|---|---|---|---|
| Global Resource Optimization Fund Lp | Other Private Fund | Delaware | $343M | 21 |
| Impax Global Opportunities Fund, L.P. | Other Private Fund | Delaware | $67.3M | 4 |
| New Energy Investors Iii Lp | Private Equity Fund | United Kingdom | $10.7M | 5 |
| Impax New Energy Investors Ii Lp | Private Equity Fund | United Kingdom | $3.6M | 20 |
People (4)
| Name | Role / title | Credentials | With firm since | Ownership |
|---|---|---|---|---|
| Simm, Ian | Director, Chief Executive Officer | Aug 1998 (28y) | Less than 5% | |
| Von Preyss, Daniel, Gunter | Director | Mar 2020 (6y) | Less than 5% | |
| Boese, John, Aquinas | Chief Compliance Officer | Nov 2020 (6y) | Less than 5% | |
| Cockburn, Karen | Director, Chief Financial Officer | Dec 2022 (4y) | Less than 5% |
Entity owners (Schedule A/B)
| Entity | Title / status | Since | Sch. | Ownership |
|---|---|---|---|---|
| Impax Asset Management Group Plc | Parent | Jun 1998 | A | 75% or more |
Undisclosed: 0% – 25% of the firm is not attributable from the filed Schedule A bands.
Roster from the IAPD representatives feed; ownership and acquisition dates from Form ADV Schedule A/B. "Since" is the earliest filed registration or acquisition date.
Private funds (4, $425M gross assets)
| Fund | Type | Gross assets | Min. investment | Owners |
|---|---|---|---|---|
| Global Resource Optimization Fund Lp | Other Private Fund | $343M | $5.0M | 21 |
| Impax Global Opportunities Fund, L.P. | Other Private Fund | $67.3M | $10.0M | 4 |
| New Energy Investors Iii Lp | Private Equity Fund | $10.7M | $1.0M | 5 |
| Impax New Energy Investors Ii Lp | Private Equity Fund | $3.6M | $1.0M | 20 |
From Form ADV Section 7.B private fund reporting.
Documents (1 archived)
| Form | Period | Size | |
|---|---|---|---|
| Form ADV (full filing) | 12/22/2025 | 1.91 MB | View · PDF · Source ↗ |
Archived copies of the firm's regulatory filings, versioned by content hash.
Disciplinary disclosures
No disciplinary events reported on the firm's latest Form ADV filing.
How they charge
- • Percentage of assets under management
- • Performance-based fees
Services
- • Portfolio management for pooled investment vehicles
Custody
Firm reports it does not have custody of client funds or securities (Item 9.A).
No custodian data reported or mined yet.
Source
All data on this page comes from this firm's Form ADV filings, reproduced without modification. Latest filing: Jul 30, 2026.
View current Form ADV (SEC/IAPD) ↗