{
  "crd_number": 105471,
  "slug": "oberweis-asset-management-inc-lisle-il-105471",
  "primary_business_name": "OBERWEIS ASSET MANAGEMENT INC",
  "legal_name": "OBERWEIS ASSET MANAGEMENT INC",
  "dbas": [],
  "city": "Lisle",
  "state": "IL",
  "country": "United States",
  "cbsa_code": "16980",
  "metro": {
    "cbsa_code": "16980",
    "common_name": "Chicago",
    "msa_name": "Chicago-Naperville-Elgin, IL-IN",
    "path": "/advisors/il/chicago"
  },
  "registration_type": "sec",
  "registration_status": "Approved",
  "registration_date": "1990-01-04",
  "years_registered": 36,
  "period": "2026-10-01",
  "filing_date": "2026-09-08",
  "carried_forward": false,
  "raum_total": 5061020947.0,
  "raum_discretionary": 5060179301.0,
  "raum_non_discretionary": 841646.0,
  "raum_band": "over_5b",
  "raum_band_label": "Over $5 billion",
  "total_employees": 31,
  "advisory_employees": 17,
  "client_count_bucket": "fewer_than_5_in_some_types",
  "clients_by_type": {
    "other": {
      "raum": 1184541.0,
      "count": 16,
      "description": "FAMILY MEMBER ACCOUNTS"
    },
    "charitable": {
      "raum": 33332750.0,
      "count": null,
      "fewer_than_5": true
    },
    "individuals": {
      "raum": 14718540.0,
      "count": 30
    },
    "banking_thrift": {
      "raum": 0.0,
      "count": 0
    },
    "state_municipal": {
      "raum": 1399545233.0,
      "count": 7
    },
    "insurance_companies": {
      "raum": 0.0,
      "count": 0
    },
    "investment_companies": {
      "raum": 3235329077.0,
      "count": 6
    },
    "pension_profit_sharing": {
      "raum": 0.0,
      "count": 0
    },
    "other_investment_advisers": {
      "raum": 0.0,
      "count": 0
    },
    "high_net_worth_individuals": {
      "raum": 49868781.0,
      "count": 36
    },
    "pooled_investment_vehicles": {
      "raum": 48751067.0,
      "count": 1
    },
    "corporations_other_businesses": {
      "raum": 278290958.0,
      "count": 12
    },
    "business_development_companies": {
      "raum": 0.0,
      "count": 0
    },
    "sovereign_wealth_foreign_official": {
      "raum": 0.0,
      "count": 0
    }
  },
  "compensation_types": [
    "other",
    "percentage_of_aum"
  ],
  "advisory_activities": [
    "portfolio_management_businesses_institutional",
    "portfolio_management_individuals",
    "portfolio_management_investment_companies",
    "portfolio_management_pooled_vehicles"
  ],
  "wrap_fee_participant": false,
  "disclosure_yes_count": 0,
  "states_registered": [
    "CA",
    "FL",
    "IL",
    "LA",
    "TX"
  ],
  "websites": [
    "https://linkedin.com/company/oberweis-asset-management",
    "https://oberweis.net",
    "https://oberweisfunds.com",
    "https://oberweisinvest.com"
  ],
  "iapd_url": "https://adviserinfo.sec.gov/firm/summary/105471",
  "city_as_filed": "LISLE",
  "url": "https://advisorcensus.com/firm/oberweis-asset-management-inc-lisle-il-105471",
  "display_name": "Oberweis Asset Management Inc",
  "summary": "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.",
  "citation": "AdvisorCensus. Oberweis Asset Management Inc (CRD 105471): Form ADV filing data as of October 2026.",
  "registration_type_label": "SEC-registered investment adviser",
  "compensation_labels": [
    "A percentage of assets under your management",
    "Other"
  ],
  "advisory_activity_labels": [
    "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"
  ],
  "quick_answers": [
    {
      "q": "How is Oberweis Asset Management Inc compensated?",
      "a": "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."
    },
    {
      "q": "Where is Oberweis Asset Management Inc located?",
      "a": "Oberweis Asset Management Inc's principal office is in Lisle, IL, according to its Form ADV."
    },
    {
      "q": "Is Oberweis Asset Management Inc registered with the SEC or a state?",
      "a": "Oberweis Asset Management Inc is an SEC-registered investment advisory firm, registered since 1990. Status as filed: Approved. CRD 105471."
    },
    {
      "q": "How much does Oberweis Asset Management Inc manage?",
      "a": "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)."
    },
    {
      "q": "How have Oberweis Asset Management Inc's assets and staff changed since 2021?",
      "a": "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."
    },
    {
      "q": "What types of clients does Oberweis Asset Management Inc serve?",
      "a": "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)."
    },
    {
      "q": "Which custodians does Oberweis Asset Management Inc use?",
      "a": "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."
    },
    {
      "q": "Does Oberweis Asset Management Inc report any disciplinary disclosures?",
      "a": "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"
    },
    {
      "q": "What changed in Oberweis Asset Management Inc's recent Form ADV filings?",
      "a": "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%)."
    }
  ],
  "filing_history": [
    {
      "period": "2021-10-01",
      "regulatory_assets_under_management": 3764944185.0,
      "total_employees": 29,
      "filing_date": "2021-03-31"
    },
    {
      "period": "2022-10-01",
      "regulatory_assets_under_management": 3784043147.0,
      "total_employees": 31,
      "filing_date": "2022-03-31"
    },
    {
      "period": "2023-10-01",
      "regulatory_assets_under_management": 2602359035.0,
      "total_employees": 32,
      "filing_date": "2023-07-05"
    },
    {
      "period": "2024-10-01",
      "regulatory_assets_under_management": 3035722713.0,
      "total_employees": 32,
      "filing_date": "2024-08-27"
    },
    {
      "period": "2025-10-01",
      "regulatory_assets_under_management": 3944834354.0,
      "total_employees": 30,
      "filing_date": "2025-03-31"
    },
    {
      "period": "2026-10-01",
      "regulatory_assets_under_management": 5061020947.0,
      "total_employees": 31,
      "filing_date": "2026-09-08"
    }
  ],
  "recent_changes": [
    {
      "period": "2026-04-01",
      "period_label": "April 2026",
      "notes": [
        "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%)."
      ]
    },
    {
      "period": "2026-02-01",
      "period_label": "February 2026",
      "notes": [
        "Registered or notice-filed in LA."
      ]
    },
    {
      "period": "2026-01-01",
      "period_label": "January 2026",
      "notes": [
        "No longer registered or notice-filed in LA."
      ]
    }
  ],
  "fees_from_brochure": null,
  "custodians": [
    {
      "name": "BNY Mellon",
      "name_as_filed": "BNY MELLON",
      "affiliated": false
    },
    {
      "name": "Northern Trust",
      "name_as_filed": "NORTHERN TRUST",
      "affiliated": false
    }
  ],
  "custodians_note": "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.",
  "markdown_url": "https://advisorcensus.com/firm/oberweis-asset-management-inc-lisle-il-105471.md",
  "clients": [
    {
      "type": "individuals",
      "label": "Individuals (other than high net worth individuals)",
      "count": 30,
      "fewer_than_5": false,
      "raum": 14718540.0
    },
    {
      "type": "high_net_worth_individuals",
      "label": "High net worth individuals",
      "count": 36,
      "fewer_than_5": false,
      "raum": 49868781.0
    },
    {
      "type": "banking_thrift",
      "label": "Banking or thrift institutions",
      "count": 0,
      "fewer_than_5": false,
      "raum": 0.0
    },
    {
      "type": "investment_companies",
      "label": "Investment companies",
      "count": 6,
      "fewer_than_5": false,
      "raum": 3235329077.0
    },
    {
      "type": "business_development_companies",
      "label": "Business development companies",
      "count": 0,
      "fewer_than_5": false,
      "raum": 0.0
    },
    {
      "type": "pooled_investment_vehicles",
      "label": "Pooled investment vehicles (other than investment companies and business development companies)",
      "count": 1,
      "fewer_than_5": false,
      "raum": 48751067.0
    },
    {
      "type": "pension_profit_sharing",
      "label": "Pension and profit sharing plans (but not the plan participants or government pension plans)",
      "count": 0,
      "fewer_than_5": false,
      "raum": 0.0
    },
    {
      "type": "charitable",
      "label": "Charitable organizations",
      "count": null,
      "fewer_than_5": true,
      "raum": 33332750.0
    },
    {
      "type": "state_municipal",
      "label": "State or municipal government entities (including government pension plans)",
      "count": 7,
      "fewer_than_5": false,
      "raum": 1399545233.0
    },
    {
      "type": "other_investment_advisers",
      "label": "Other investment advisers",
      "count": 0,
      "fewer_than_5": false,
      "raum": 0.0
    },
    {
      "type": "insurance_companies",
      "label": "Insurance companies",
      "count": 0,
      "fewer_than_5": false,
      "raum": 0.0
    },
    {
      "type": "sovereign_wealth_foreign_official",
      "label": "Sovereign wealth funds and foreign official institutions",
      "count": 0,
      "fewer_than_5": false,
      "raum": 0.0
    },
    {
      "type": "corporations_other_businesses",
      "label": "Corporations or other businesses not listed above",
      "count": 12,
      "fewer_than_5": false,
      "raum": 278290958.0
    },
    {
      "type": "other",
      "label": "Other",
      "count": 16,
      "fewer_than_5": false,
      "raum": 1184541.0
    }
  ],
  "disclosure_line": "Reports no disclosure items on Form ADV Item 11.",
  "disclosure_items": [],
  "indexable": true,
  "suppressed": false,
  "claimed": false,
  "enhanced": false,
  "provided_by_the_firm": null,
  "source": {
    "name": "Form ADV",
    "as_of": "2026-10-01",
    "iapd_url": "https://adviserinfo.sec.gov/firm/summary/105471",
    "operator": "BH Monitor Services, LLC",
    "license": "https://creativecommons.org/licenses/by/4.0/",
    "credit": "AdvisorCensus (advisorcensus.com), from SEC Form ADV data"
  }
}