Firm profile

Oberweis Asset Management Inc.

LISLE, ILCRD 105471Registration Status: ApprovedEffective since January 4, 1990SEC # 801-35657Latest ADV September 8, 2026

Oberweis Asset Management Inc is an SEC registered investment adviser organized as a corporation with a primary office location in Lisle, IL. Its latest Form ADV filing, dated September 8, 2026, reports $5.1B in regulatory assets under management, 31 employees, 1 office, and 110 accounts.

Assets Under Management
$5.1B
Employees
31
Offices
1 office
Total Clients
108

Associated firm names

1 name listed
  • OBERWEIS ASSET MANAGEMENT INC

Leadership

2 roles identified
CCOThomas P. Joyce
CFOEric V. Hannemann

Advisory services offered

4 types reported
Portfolio management for businesses
Portfolio management for individuals and small businesses
Portfolio management for investment companies

Fee models offered

2 types reported
Asset based fees
Other fee arrangements

Offices & Contact

Primary office

LISLE, Illinois, United States

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Primary office regionOther reported regions

Shading shows states and countries with reported offices. Cities are listed below; shading does not indicate service coverage.

Illinois

LISLEPrimary office

1 office records listed · 1 total offices reported. Counts can use different reporting dates. SEC filers may list only their largest 25 additional offices.

Contact and digital presence

ADV profile links

Regulatory Assets Under Management Breakdown

Total regulatory assets under management$5.1Bas of September 8, 2026
Discretionary100.0%
$5.1B
100% of total RAUM100.0%
Non-discretionary0.0%
$842K
0% of total RAUM0.0%
All regulatory assets under management are discretionary.

Client Coverage Demographics

Top client segmentHNWI represent 33.3% of total clients.
Top client categories% of clientsClients
1
HNWI
33.3%
36
2
Individuals
27.8%
30
3
FAMILY MEMBER ACCOUNTS
14.8%
16
4
Corporations
11.1%
12
5
Government
6.5%
7
Categories with <5 clients
Charitable Organizations<5 clients

Assets under management Growth by Quarter

Quarterly points use the latest ADV filing or SEC roster snapshot available in each quarter.

Total AUM$5.1B
Total Accounts110
10Y AUM Change+$2.3B (+81.7%)

Private Funds

Private funds reported by Oberweis Asset Management Inc.

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Employee Growth by Quarter

Quarterly points use the latest ADV filing or SEC roster snapshot available in each quarter.

Total Employees31
Clients per Employee3:1
10Y Employee Change+6 (+24.0%)

Historical AUM and employee figures reflect available SEC Form ADV filings under this CRD. Filing gaps may reflect registration status changes, dormant periods, state registration periods, firm restructuring, or other reporting changes. Rialytix does not interpolate missing periods.


Ownership

Reported direct and indirect ownership ranges

Each range applies to a separate reported relationship and should not be added together.

Reported ownership ranges

Highlighted bands show the percentage range reported in Form ADV.

0%25%50%75%100%
JAMES WALTER OBERWEISDirect owner · Schedule AInterest in OBERWEIS ASSET MANAGEMENT INC
50% to < 75%
JAMES DONALD OBERWEISDirect owner · Schedule AInterest in OBERWEIS ASSET MANAGEMENT INC
10% to < 25%

Bars represent the reported range at that individual ownership step, not an estimated percentage of the advisory firm. Indirect relationships may refer to intermediate entities rather than directly to Oberweis Asset Management Inc..

No indirect ownership information reported in the source’s Schedule B.

Reported ownership and control details

Form ADV · Filing date 2026-09-08 · Schedules A and B

4 entries
#Owner / person & roleInterest in entityReported interestControl personTitle / status acquiredSource
1JAMES DONALD OBERWEISSHAREHOLDERIndividualOBERWEIS ASSET MANAGEMENT INC10% to less than 25%Code BNoSHAREHOLDER09/1994Schedule APDF page 26
2JAMES WALTER OBERWEISCHAIRMAN, PRESIDENT, SHAREHOLDER AND DIRECTORIndividualOBERWEIS ASSET MANAGEMENT INC50% to less than 75%Code DYesCHAIRMAN, PRESIDENT, SHAREHOLDER AND DIRECTOR11/1994Schedule APDF page 26
3THOMAS PATRICK JOYCECHIEF COMPLIANCE OFFICER, SECRETARYIndividualOBERWEIS ASSET MANAGEMENT INCLess than 5%Code NANoCHIEF COMPLIANCE OFFICER, SECRETARY09/2022Schedule APDF page 26
4ERIC VICARY HANNEMANNCHIEF FINANCIAL OFFICER, TREASURERIndividualOBERWEIS ASSET MANAGEMENT INCLess than 5%Code NANoCHIEF FINANCIAL OFFICER, TREASURER09/2022Schedule APDF page 26

Less than 5% may include zero. Code F identifies a role without specifying a percentage. Reported interests may overlap and may not include every owner. Total indirect ownership is not calculated.

Compliance & Disclosures

Filing dated 9/8/2026 11:29:34 AM

Responses were selected by the RIA in its filing. Questions are shortened for readability; “you” refers to the reporting firm, and some questions also cover advisory affiliates.

RIA or supervised-person involvementThe RIA reported that none of the events below involve the firm or its supervised persons.RIA responseNo
AFelonies2 No

In the past ten years, have you or any advisory affiliate:

  • A1Been convicted of or pleaded guilty or no contest to a felony?No
  • A2Been charged with a felony?No
BMisdemeanors2 No

In the past ten years, have you or any advisory affiliate:

  • B1Been convicted of or pleaded guilty or no contest to a misdemeanor involving investments, an investment-related business, fraud, false statements or omissions, wrongful taking of property, bribery, perjury, forgery, counterfeiting, or extortion?No
  • B2Been charged with a misdemeanor of the kind listed above?No
CSEC or CFTC actions5 No

Has the SEC or CFTC ever:

  • C1Found you or an advisory affiliate made a false statement or omission?No
  • C2Found you or an advisory affiliate violated SEC or CFTC regulations or statutes?No
  • C3Found you or an advisory affiliate caused an investment-related business to have its authorization to do business denied, suspended, revoked, or restricted?No
  • C4Entered an order against you or an advisory affiliate in connection with investment-related activity?No
  • C5Imposed a civil money penalty on you or an advisory affiliate, or ordered you or an advisory affiliate to cease and desist from any activity?No
DOther regulatory actions5 No

Has any other federal regulatory agency, state regulatory agency, or foreign financial regulatory authority ever:

  • D1Found you or an advisory affiliate made a false statement or omission, or was dishonest, unfair, or unethical?No
  • D2Found you or an advisory affiliate violated investment-related regulations or statutes?No
  • D3Found you or an advisory affiliate caused an investment-related business to have its authorization to do business denied, suspended, revoked, or restricted?No
  • D4In the past ten years, entered an order against you or an advisory affiliate in connection with investment-related activity?No
  • D5Denied, suspended, or revoked your or an advisory affiliate’s registration or license, or otherwise prevented association with an investment-related business or restricted activities?No
ESelf-regulatory organization actions4 No

Has a self-regulatory organization or commodities exchange ever:

  • E1Found you or an advisory affiliate made a false statement or omission?No
  • E2Found you or an advisory affiliate violated its rules, other than a violation designated as a minor rule violation under an SEC-approved plan?No
  • E3Found you or an advisory affiliate caused an investment-related business to have its authorization to do business denied, suspended, revoked, or restricted?No
  • E4Disciplined you or an advisory affiliate by expulsion, suspension, barring association with other members, or otherwise restricting activities?No
FProfessional authorizations1 No
  • FHas an authorization to act as an attorney, accountant, or federal contractor granted to you or an advisory affiliate ever been revoked or suspended?No
GPending regulatory proceedings1 No
  • GAre you or any advisory affiliate now the subject of a regulatory proceeding that could result in a “Yes” answer to any part of C, D, or E?No
HCivil judicial actions and proceedings4 No

(1) Court actions

Has a domestic or foreign court:

  • H(1)(a)In the past ten years, enjoined you or an advisory affiliate in connection with investment-related activity?No
  • H(1)(b)Found that you or an advisory affiliate violated investment-related statutes or regulations?No
  • H(1)(c)Dismissed, pursuant to a settlement agreement, an investment-related civil action brought against you or an advisory affiliate by a state or foreign financial regulatory authority?No

(2) Pending civil proceedings

  • H(2)Are you or any advisory affiliate now the subject of a civil proceeding that could result in a “Yes” answer to any part of H(1)?No

* Metrics are based on the latest available data, including Form ADV filings, brochures, and relationship summaries pulled from the SEC IAPD, and may be subject to change. Learn what is included in the Rialytix data. Please refer to the firm's official disclosures for the most accurate information using their CRD number. This is not investment advice.