Oberweis Asset Management provides portfolio management for individuals and small businesses, portfolio management for investment companies, portfolio management for pooled vehicles, and portfolio management for institutions. The firm advises 1 private fund.
Oberweis Asset Management reports 108 clients. They include 36 high-net-worth individuals, 30 individual clients and 16 other clients. Nearly all assets ($5.06B across 109 accounts) are managed with discretion; $842K across 1 account is not. Of its clients, 3% are outside the U.S.
| Client type | Clients | Assets |
|---|---|---|
| Individuals (other than HNW) | 28% | <1% |
| High-net-worth individuals | 33% | <1% |
| Investment companies | 6% | 64% |
| Pooled investment vehicles | <1% | <1% |
| Charitable organizations | Fewer than 5 | <1% |
| Other client typesState or municipal government entities; Corporations and other businesses; Other | 32% | 33% |
Client shares use reported counts. Client types without a reported count are excluded from that total.
Client breakdown and activity details
| Client type | Clients | Regulatory AUM | AUM share | Avg. per client |
|---|---|---|---|---|
| Individuals (other than HNW) | 30 | $14.7M | 0.3% | $491K |
| High-net-worth individuals | 36 | $49.9M | 1.0% | $1.39M |
| Investment companies | 6 | $3.24B | 63.9% | $539M |
| Pooled investment vehicles | 1 | $48.8M | 1.0% | $48.8M |
| Charitable organizations | Fewer than 5 | $33.3M | 0.7% | — |
| State or municipal government entities | 7 | $1.4B | 27.7% | $200M |
| Corporations and other businesses | 12 | $278M | 5.5% | $23.2M |
| Other | 16 | $1.18M | 0.0% | $74K |
| Total | 108 | $5.06B | 100% | — |
- Clients
- 30
- Regulatory AUM
- $14.7M
- AUM share
- 0.3%
- Avg. per client
- $491K
- Clients
- 36
- Regulatory AUM
- $49.9M
- AUM share
- 1.0%
- Avg. per client
- $1.39M
- Clients
- 6
- Regulatory AUM
- $3.24B
- AUM share
- 63.9%
- Avg. per client
- $539M
- Clients
- 1
- Regulatory AUM
- $48.8M
- AUM share
- 1.0%
- Avg. per client
- $48.8M
- Clients
- Fewer than 5
- Regulatory AUM
- $33.3M
- AUM share
- 0.7%
- Avg. per client
- —
- Clients
- 7
- Regulatory AUM
- $1.4B
- AUM share
- 27.7%
- Avg. per client
- $200M
- Clients
- 12
- Regulatory AUM
- $278M
- AUM share
- 5.5%
- Avg. per client
- $23.2M
- Clients
- 16
- Regulatory AUM
- $1.18M
- AUM share
- 0.0%
- Avg. per client
- $74K
Total
- Clients
- 108
- Regulatory AUM
- $5.06B
- AUM share
- 100%
- Avg. per client
- —
- Clients outside the U.S.
- 3%
- Clients advised without assets under management last fiscal year
- 0
- Private funds advised
- 1
Oberweis Asset Management is paid through a percentage of assets under management and other compensation; its fees and minimums are set out in its brochures on the SEC website.
The leadership team of Oberweis Asset Management includes President James Oberweis, Chief Financial Officer Eric Hannemann and Chief Compliance Officer Thomas Joyce. It has 31 employees, 17 of them in advisory roles.
Leadership
- James OberweisChairman, President, Shareholder and Director
Eric HannemannChief Financial Officer, Treasurer
Thomas JoyceChief Compliance Officer, Secretary- James OberweisShareholder
Investment adviser representatives
7 representatives listed in the SEC register as of 9 October 2026.
- Scott Valey Braser
- David Isidarus Covas
- Benjamin Aaron Krimmel
- Thomas Russell Labelle
- Brett Allen Pierson
- John Carol Tyrpin
Staff
- 31 employees
- 17 in advisory functions
- 7 state-registered reps
- 18 broker-dealer reps
- Owns 10% to 25% of Oberweis Asset Management Inc
James Oberweis
Control person · since September 1994
Oberweis Asset Management’s regulatory assets grew from $3.76B (March 2021) to $5.06B (September 2026); clients fell from 115 to 108 and employees rose from 29 to 31.
Figures from each annual filing
| Filed | Regulatory AUM | Clients | Employees | Offices |
|---|---|---|---|---|
| September 2026 | $5.06B | 108 | 31 | 1 |
| March 2025 | $3.94B | 108 | 30 | 1 |
| March 2024 | $3.04B | 117 | 32 | 1 |
| July 2023 | $2.6B | 118 | 32 | 1 |
| March 2022 | $3.78B | 117 | 31 | 1 |
| March 2021 | $3.76B | 115 | 29 | 2 |
Besides its headquarters, Oberweis Asset Management has 0 offices, with 1 listed address in Illinois.
Illinois · 1 listed address
- 3333 Warrenville Road, Suite 500, LisleHQ
Contact and registration details
- Legal name
- Oberweis Asset Management Inc
- Headquarters
- 3333 Warrenville Road, Suite 500, Lisle, IL 60532
- Website
- oberweis.net
- Phone
- 630-577-2300
- @oberweis-asset-management
- SEC file
- 801-35657
- Structure
- Illinois corporation
- Fiscal year end
- December
Oberweis Asset Management uses Northern Trust ($841M, 50%) and BNY Mellon ($838M, 50%) as custodians for its separately managed accounts. Oberweis Asset Management does not have custody of client assets.
- Northern TrustNorthern Trust · Chicago, IL · $841M50%
- BNY MellonBNY Mellon · Chicago, IL · $838M50%
At year end, Oberweis Asset Management’s separately managed accounts were mostly in stocks (96%). Its reported 13F holdings for the quarter ended 30 June 2026 total $4.84B across 176 positions; the largest are Credo Technology Group (5.7%), Applied Optoelectronics Inc.. (5.5%) and Digitalocean Holdings, Inc.. (3.0%).
What the accounts hold
- Stocks96%
- Bonds1%
- Cash3%
Reported 13F holdings
- $4.84B
- Reported 13F value
- 176
- Positions
- 26.6%
- In the 10 largest
- +42.9%
- Value vs. prior quarter
- Credo Technology Group5.7%
- Applied Optoelectronics Inc..5.5%
- Digitalocean Holdings, Inc..3.0%
- Silicon Motion Techn ADR2.2%
- Ultra Clean Holdings1.9%
- Sharkninja, Inc..1.9%
- Sitime Corporation1.8%
- Brightspring Health Services1.7%
- Hinge Health, Inc..1.5%
- Rambus, Inc.1.4%
Together, the ten largest are 26.6% of reported value.
How many clients does Oberweis Asset Management have?
Oberweis Asset Management has 108 clients and manages $5.06 billion for them, as of September 2026. They include 36 high-net-worth individuals, 30 individual clients and 16 other clients.
Source: Form ADV Part 1A, Items 5.D and 5.F, filed 8 September 2026
What services does Oberweis Asset Management offer?
Oberweis Asset Management provides portfolio management for individuals and small businesses, portfolio management for investment companies, portfolio management for pooled vehicles, and portfolio management for institutions.
Source: Form ADV Part 1A, Item 5.G, from the SEC's 2 October 2026 data file
Which custodians does Oberweis Asset Management use?
Oberweis Asset Management’s separately managed account assets are held at Northern Trust (Chicago, IL), with $841M and BNY Mellon (Chicago, IL), with $838M. Only custodians holding at least a tenth of those assets are named.
Source: Form ADV Part 1A, Schedule D, Section 5.K.(3), filed 8 September 2026
How many financial advisors does Oberweis Asset Management have?
Oberweis Asset Management has 7 investment adviser representatives registered with state securities authorities, out of 31 employees, and 17 perform investment advisory functions. 18 employees are registered representatives of a broker-dealer and 0 employees are licensed insurance agents.
Source: Form ADV Part 1A, Items 5.A and 5.B, from the SEC's 2 October 2026 data file
What does Oberweis Asset Management invest in?
At the end of its last fiscal year, Oberweis Asset Management’s separately managed accounts held 96% exchange-traded equities, 3% cash and equivalents and 1% U.S. government and agency bonds. It advises 1 private fund.
Source: Form ADV Part 1A, Items 5.K.(1) and 7.B, from the SEC's 2 October 2026 data file
Who owns Oberweis Asset Management?
Oberweis Asset Management’s direct owner is James Oberweis, each holding 25% or less.
Source: Form ADV Part 1A, Schedules A and B, filed 8 September 2026
How does Oberweis Asset Management get paid?
Oberweis Asset Management is paid through a percentage of assets under management and other compensation. Its Form ADV lists no commissions or performance-based fees among how it is paid.
Source: Form ADV Part 1A, Item 5.E, from the SEC's 2 October 2026 data file
How do I contact Oberweis Asset Management?
Oberweis Asset Management’s main office is at 3333 Warrenville Road, Suite 500, Lisle, IL 60532. Its phone number is 630-577-2300. Its website is oberweis.net.