Data / Investment advisers / Illinois / Oberweis Asset Management Inc
Oberweis Asset Management Inc, Lisle, IL: $5.1 billion AUM, SEC registered investment adviser
Updated November 7, 2026. Source: the SEC's Form ADV data files for investment advisers.
Oberweis Asset Management Inc is an SEC registered investment adviser with its main office in Lisle, Illinois and reports $5.1 billion in regulatory assets under management in its Form ADV filed September 8, 2026. Its clients include investment companies, state and municipal governments and corporations and other businesses. It is paid through a percentage of assets under management and other fees. It advises 1 private fund.
The request: Watch Oberweis Asset Management Inc (CRD number 105471): 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
- 105471
- SEC file number
- 801-35657
- SEC status
- Approved, effective January 4, 1990
- Main office
- 3333 Warrenville Road Suite 500, Lisle, IL 60532
- Phone
- (630) 577-2300
- Website
- oberweis.net
- Regulatory AUM
- $5,061,020,947 in the Form ADV filed September 8, 2026
- Discretionary AUM
- $5,060,179,301
- Non discretionary AUM
- $841,646
- Accounts
- 110
- Employees
- 31, of which 17 give investment advice
- Form of organization
- Corporation
- Paid through
- a percentage of assets under management, other fees
- Private funds
- 1: 1 other private fund
- Gross assets of private funds
- $48,751,067
- Form ADV Item 11 disclosures
- None reported
- Latest Form ADV filing
- September 8, 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 | 6 | $3.24 billion |
| State or municipal government entities | 7 | $1.40 billion |
| Corporations or other businesses | 12 | $278.3 million |
| High net worth individuals | 36 | $49.9 million |
| Pooled investment vehicles | 1 | $48.8 million |
| Charitable organizations | Fewer than 5 | $33.3 million |
| Individuals (other than high net worth individuals) | 30 | $14.7 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 |
|---|---|---|
| April 1, 2026 | $5.06 billion | March 31, 2026 |
| December 1, 2025 | $3.94 billion | March 31, 2025 |
Other advisers in Illinois
| Adviser | City | AUM | Private funds | Source |
|---|---|---|---|---|
| Aquatic Capital Management LLC | Chicago | $5.43 billion | 2 | adviserinfo.sec.gov |
| David Vaughan Investments, LLC | Peoria | $5.33 billion | Not listed | adviserinfo.sec.gov |
| Alera Investment Advisors, LLC | Deerfield | $5.29 billion | Not listed | adviserinfo.sec.gov |
| Twin Bridge Capital Partners, LLC | Chicago | $5.20 billion | 9 | adviserinfo.sec.gov |
| Taiko | Chicago | $5.09 billion | Not listed | adviserinfo.sec.gov |
| Neuberger Berman Loan Advisers LLC | Chicago | $4.93 billion | 13 | adviserinfo.sec.gov |
| Chicago Capital, LLC | Chicago | $4.82 billion | Not listed | adviserinfo.sec.gov |
| Brownson, Rehmus & Foxworth, Inc. | Chicago | $4.79 billion | Not listed | adviserinfo.sec.gov |
Also on SpecStream
- Investment advisers in Illinois
- Advisers with $1 billion to $10 billion in AUM
- Advisers serving investment companies
- Advisers serving state and municipal governments
- Advisers that manage private funds
- Oberweis Asset Management Inc 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.