# Oberweis Asset Management Inc

> Oberweis Asset Management Inc is an SEC-registered investment advisory firm in Lisle, IL, registered since 1990, reporting over $5 billion in regulatory assets under management in its Form ADV filing dated September 8, 2026.

- CRD: 105471
- Filed as: OBERWEIS ASSET MANAGEMENT INC
- Registration: SEC-registered investment adviser (status as filed: Approved)
- Location: Lisle, IL
- Filing period: October 2026
- Form ADV filing dated: September 8, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/105471
- AdvisorCensus page: https://advisorcensus.com/firm/oberweis-asset-management-inc-lisle-il-105471

## Quick answers

**How is Oberweis Asset Management Inc compensated?**
On its Form ADV (Item 5.E, October 2026), Oberweis Asset Management Inc reports these compensation arrangements: a percentage of assets under its management; other. The amounts are in Item 5 of its Form ADV Part 2A brochure.

**Where is Oberweis Asset Management Inc located?**
Oberweis Asset Management Inc's principal office is in Lisle, IL, according to its Form ADV.

**Is Oberweis Asset Management Inc registered with the SEC or a state?**
Oberweis Asset Management Inc is an SEC-registered investment advisory firm, registered since 1990. Status as filed: Approved. CRD 105471.

**How much does Oberweis Asset Management Inc manage?**
Oberweis Asset Management Inc reports $5,061,020,947 in regulatory assets under management in its Form ADV filing dated September 8, 2026 (100% discretionary).

**How have Oberweis Asset Management Inc's assets and staff changed since 2021?**
In the Form ADV data for Oberweis Asset Management Inc: Regulatory assets under management: $3,764,944,185 in the October 2021 data and $5,061,020,947 in the October 2026 data, up 34%. Total employees: 29 in October 2021 and 31 in October 2026. Assets under management move with markets as well as with clients coming and going.

**What types of clients does Oberweis Asset Management Inc serve?**
By number of clients on Form ADV Item 5.D: high net worth individuals (36); individuals (other than high net worth individuals) (30); other (16).

**Which custodians does Oberweis Asset Management Inc use?**
Oberweis Asset Management Inc's most recent Form ADV filing (Schedule D, Section 5.K(3)) lists BNY Mellon and Northern Trust as custodians holding 10% or more of its separately managed account assets.

**Does Oberweis Asset Management Inc report any disciplinary disclosures?**
Reports no disclosure items on Form ADV Item 11. The detail of any item is on the firm's SEC record: https://adviserinfo.sec.gov/firm/summary/105471

**What changed in Oberweis Asset Management Inc's recent Form ADV filings?**
In the April 2026 filing data: Employees performing advisory functions went from 16 to 17. Regulatory assets under management went from $3,944,834,354 to $5,061,020,947 (+28%).

## From the Form ADV filing

### Compensation (Item 5.E)
- A percentage of assets under your management
- Other

### Custodians (Schedule D, Section 5.K(3))
- BNY Mellon
- Northern Trust

Custodians holding 10% or more of the firm's separately managed account assets, as filed on Form ADV (Schedule D, Section 5.K(3)). A custodian holds client assets; it does not endorse or supervise the firm. AdvisorCensus has no relationship with any custodian.

### Regulatory assets under management (Item 5.F)
- Total: $5,061,020,947
- Discretionary: $5,060,179,301
- Non-discretionary: $841,646

### Clients (Item 5.D)

| Client type | Clients | Assets |
| --- | --- | --- |
| Individuals (other than high net worth individuals) | 30 | $14,718,540 |
| High net worth individuals | 36 | $49,868,781 |
| Banking or thrift institutions | 0 | $0 |
| Investment companies | 6 | $3,235,329,077 |
| Business development companies | 0 | $0 |
| Pooled investment vehicles (other than investment companies and business development companies) | 1 | $48,751,067 |
| Pension and profit sharing plans (but not the plan participants or government pension plans) | 0 | $0 |
| Charitable organizations | Fewer than 5 | $33,332,750 |
| State or municipal government entities (including government pension plans) | 7 | $1,399,545,233 |
| Other investment advisers | 0 | $0 |
| Insurance companies | 0 | $0 |
| Sovereign wealth funds and foreign official institutions | 0 | $0 |
| Corporations or other businesses not listed above | 12 | $278,290,958 |
| Other | 16 | $1,184,541 |

### Advisory services (Item 5.G)
- Portfolio management for individuals and/or small businesses
- Portfolio management for investment companies (and business development companies)
- Portfolio management for pooled investment vehicles (other than investment companies)
- Portfolio management for businesses (other than small businesses) or institutional clients

### Firm details
- Registered since: 1990 (36 years)
- Employees: 31 total, 17 performing advisory functions
- Wrap fee program participation: No
- States registered or notice-filed: CA, FL, IL, LA, TX
- Disclosures (Item 11): Reports no disclosure items on Form ADV Item 11.

### Websites listed on Form ADV (Item 1.I)
- oberweis.net
- oberweisfunds.com
- oberweisinvest.com
- LinkedIn @oberweis-asset-management

## Assets and staff over time

| Data period | Regulatory assets under management | Employees | Filing dated |
| --- | --- | --- | --- |
| October 2021 | $3,764,944,185 | 29 | March 31, 2021 |
| October 2022 | $3,784,043,147 | 31 | March 31, 2022 |
| October 2023 | $2,602,359,035 | 32 | July 5, 2023 |
| October 2024 | $3,035,722,713 | 32 | August 27, 2024 |
| October 2025 | $3,944,834,354 | 30 | March 31, 2025 |
| October 2026 | $5,061,020,947 | 31 | September 8, 2026 |

Regulatory assets under management: $3,764,944,185 in the October 2021 data and $5,061,020,947 in the October 2026 data, up 34%.
Total employees: 29 in October 2021 and 31 in October 2026.

## Changes in the filing (last 12 months)

### April 2026
- Employees performing advisory functions went from 16 to 17.
- Regulatory assets under management went from $3,944,834,354 to $5,061,020,947 (+28%).

### February 2026
- Registered or notice-filed in LA.

### January 2026
- No longer registered or notice-filed in LA.

## Source

Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. Oberweis Asset Management Inc (CRD 105471): Form ADV filing data as of October 2026.