Data / Investment advisers / New Hampshire / Impax Asset Management LLC
Impax Asset Management LLC, Portsmouth, NH: $8.9 billion AUM, SEC registered investment adviser
Updated November 7, 2026. Source: the SEC's Form ADV data files for investment advisers.
Impax Asset Management LLC is an SEC registered investment adviser with its main office in Portsmouth, New Hampshire and reports $8.9 billion in regulatory assets under management in its Form ADV filed October 26, 2026. Its clients include investment companies, pooled investment vehicles and other investment advisers. It is paid through a percentage of assets under management.
The request: Watch Impax Asset Management LLC (CRD number 114335): each new Form ADV amendment, with AUM, clients and private funds. $10 of work on sign-up, no card.
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- Registration
- SEC registered investment adviser
- CRD number
- 114335
- SEC file number
- 801-8517
- SEC status
- Approved, effective March 24, 1972
- Main office
- 30 Penhallow Street, Suite 400, Portsmouth, NH 03801
- Phone
- (603) 431-8022
- Website
- impaxam.com
- Regulatory AUM
- $8,942,785,264 in the Form ADV filed October 26, 2026
- Discretionary AUM
- $8,942,785,264
- Accounts
- 27
- Employees
- 93, of which 30 give investment advice
- Form of organization
- Limited Liability Company
- Paid through
- a percentage of assets under management
- Other offices
- 1
- Form ADV Item 11 disclosures
- None reported
- Latest Form ADV filing
- October 26, 2026
- SEC record
- Investment Adviser Public Disclosure
Clients
Client types the adviser reports in Form ADV item 5.D, with the AUM it attributes to each.
| Client type | Clients | AUM |
|---|---|---|
| Investment companies | 12 | $7.79 billion |
| Pooled investment vehicles | 7 | $1.02 billion |
| Other investment advisers | 8 | $128.4 million |
AUM in the SEC's monthly files
Each change in the AUM the adviser reported across the monthly SEC files held here, with the first file that shows the new value.
| First in the file of | AUM | Form ADV filed |
|---|---|---|
| January 2, 2026 | $8.94 billion | December 22, 2025 |
| December 1, 2025 | $9.64 billion | December 20, 2024 |
Other advisers in Portsmouth
| Adviser | City | AUM | Private funds | Source |
|---|---|---|---|---|
| Prime Buchholz LLC | Portsmouth | $14.07 billion | Not listed | adviserinfo.sec.gov |
| Matrix Capital Management Company, LP | Portsmouth | $2.32 billion | 2 | adviserinfo.sec.gov |
| Wellesley Asset Management, Inc. | Portsmouth | $1.99 billion | 1 | adviserinfo.sec.gov |
| Tide Cycle Resources LLC | Portsmouth | $1.85 billion | Not listed | adviserinfo.sec.gov |
| David Wendell Associates, Inc. | Portsmouth | $1.33 billion | Not listed | adviserinfo.sec.gov |
| Arca Wealth, LLC | Portsmouth | $1.27 billion | Not listed | adviserinfo.sec.gov |
Also on SpecStream
- Investment advisers in Portsmouth, NH
- Investment advisers in New Hampshire
- Advisers with $1 billion to $10 billion in AUM
- Advisers serving investment companies
- Advisers serving pooled investment vehicles
- Impax Asset Management LLC on the SEC's adviser search
Public data published by the US Securities and Exchange Commission (US government work). Advisers report these values themselves in Form ADV, and neither the SEC nor the states approve or guarantee them. AUM is regulatory assets under management as the adviser reported it in Form ADV item 5.F, which can differ from the AUM a firm quotes elsewhere. Exempt reporting advisers do not report AUM. Office address, phone and website are the adviser's main office as filed; a firm that files its main office as a private residence shows no street address or phone. An Item 11 disclosure is a reported event, not a finding about the firm today. Details for each firm are on the SEC's Investment Adviser Public Disclosure site. This page uses SEC data and is not endorsed or certified by the SEC. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.