Asset manager · Lisle, IL
Oberweis Asset Management Inc
SEC-registered investment adviser · CRD 105471 · SEC 801-35657
At a glance
Oberweis Asset Management Inc is an SEC-registered investment adviser based in Lisle, Illinois, with $5.1 billion in regulatory assets under management as of its Form ADV filed September 8, 2026. Its largest client group by assets is investment companies, and it reports 66 individual clients. By Form ADV it is a asset manager, ranked 691st of 3,218 asset managers and 2,082nd of 17,210 SEC-registered advisers by assets.
Main office 630-577-2300oberweis.netLinkedInAs filed on Form ADV
- Regulatory AUM
- $5.1B
- Rank among asset managers
- #691 of 3,218
- Rank among all SEC RIAs
- #2,082 of 17,210
- Rank in Illinois
- #114 of 684
- Individual clients
- 66
- High-net-worth clients
- 36
- Accounts
- 110
- Discretionary
- 100% of AUM
- Employees
- 31
- Advisory staff
- 17
- Offices
- 1
Owners and executives on its Form ADV
- James D. OberweisShareholder
- James W. OberweisChairman, President, Shareholder and Director
- Thomas P. JoyceChief Compliance Officer, Secretary
- Eric V. HannemannChief Financial Officer, Treasurer
Custody and brokerage
Broker-dealer
Hybrid RIA
Oberweis Asset Management Inc is a hybrid RIA: 18 of its employees are also registered representatives of a broker-dealer. It names an affiliated broker-dealer: Oberweis Securities, Inc..
- Oberweis Securities, Inc. ↗CRD 42060
An introducing broker-dealer: its trades clear through another firm, which holds the brokerage accounts. Its annual audited report filed with the SEC, March 2026
Who it serves
| Client type | Clients | Regulatory AUM | Share |
|---|---|---|---|
| Investment companies | 6 | $3.2B | 64% |
| State or municipal government entities | 7 | $1.4B | 28% |
| Corporations or other businesses | 12 | $278M | 5% |
| High-net-worth individuals | 36 | $50M | <1% |
| Pooled investment vehicles | 1 | $49M | <1% |
| Charitable organizations | – | $33M | <1% |
| Individuals | 30 | $15M | <1% |
| Other | 16 | $1M | <1% |
Private funds
Oberweis Asset Management Inc reports 1 private funds with $49M in gross assets: other private funds (Form ADV Item 7.B).
Disciplinary disclosures
Oberweis Asset Management Inc reports no disciplinary disclosures in Item 11 of Form ADV. Read the details on the SEC’s adviser search ↗
Services
- Portfolio management for individuals and small businesses
- Portfolio management for investment companies
- Portfolio management for pooled investment vehicles
- Portfolio management for businesses and institutions
How it’s paid
- A percentage of assets under management
- Other
Form ADV and brochures on the SEC’s adviser search ↗oberweis.net ↗
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The full record on Oberweis Asset Management Inc
Ten years of SEC filings, its owners and contacts, and how it stacks up against its peers. Atlas members see all of it.
- Assets, accounts, clients and staff, ten years of filings
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- Growth over one, three and five years
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- Rank against 701 peers of its type and size
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- Owners and executives, with titles and stakes
- 4 namedLocked
- Main office, fax and compliance officer
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- Filing changes this year, with alerts
- 1Locked
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Background
Questions
How much does Oberweis Asset Management Inc manage?
Oberweis Asset Management Inc reports $5.1 billion in regulatory assets under management across 110 accounts, 100% of it on a discretionary basis, on its Form ADV filed September 8, 2026.
What kind of firm is Oberweis Asset Management Inc?
Oberweis Asset Management Inc is a asset manager by its Form ADV answers. Most of its assets are managed for funds, institutions or other businesses rather than individuals.
Who are Oberweis Asset Management Inc’s clients?
By assets, its largest client types are investment companies ($3.2 billion, 6 clients); state or municipal government entities ($1.4 billion, 7 clients); corporations or other businesses ($278 million, 12 clients).
Does Oberweis Asset Management Inc manage private funds?
Yes. It reports 1 private funds with $49 million in gross assets, including other private funds.
Does Oberweis Asset Management Inc have any disciplinary history?
Oberweis Asset Management Inc reports no disciplinary disclosures in Item 11 of its Form ADV. Check the SEC’s adviser search for the latest record.
Where these numbers come from
Every figure is Oberweis Asset Management Inc’s own answer on its latest Form ADV, from the SEC’s registered-adviser list as of October 1, 2026: regulatory assets and accounts (Item 5.F), clients by type (5.D), employees (5.A and 5.B), compensation (5.E) and services (5.G). Custodians come from Schedule D 5.K(3) of its latest filing (2026-09-08), which lists those holding 10% or more of separately managed account assets and the amount at each. “Hybrid” means some employees are also registered representatives of a broker-dealer (Item 5.B(2)); affiliated broker-dealers are the related persons it lists in Item 7.A and Schedule D. Firm type comes from its own answers: broker-dealer firms are registered broker-dealers themselves (Item 6.A); private fund advisers manage mostly private funds (Item 7.B, 5.D); wealth managers manage at least half their assets for individuals (5.D). Ranks compare it by regulatory assets with every SEC-registered adviser and with firms of its type. Figures are as of the firm’s last annual update, so they can lag recent deals and market moves. Regulatory AUM counts assets the firm continuously supervises and can differ from what a firm markets.
Not an endorsement or a recommendation. Before hiring any adviser, read its Form ADV Part 2A brochure and check its record on the SEC’s adviser search. How to check a financial advisor →