{
  "crd_number": 157542,
  "slug": "portolan-capital-management-llc-boston-ma-157542",
  "primary_business_name": "PORTOLAN CAPITAL MANAGEMENT, LLC",
  "legal_name": "PORTOLAN CAPITAL MANAGEMENT, LLC",
  "dbas": [],
  "city": "Boston",
  "state": "MA",
  "country": "United States",
  "cbsa_code": "14460",
  "metro": {
    "cbsa_code": "14460",
    "common_name": "Boston",
    "msa_name": "Boston-Cambridge-Newton, MA-NH",
    "path": "/advisors/ma/boston"
  },
  "registration_type": "sec",
  "registration_status": "Approved",
  "registration_date": "2012-03-30",
  "years_registered": 14,
  "period": "2026-10-01",
  "filing_date": "2026-04-15",
  "carried_forward": false,
  "raum_total": 2021361155.0,
  "raum_discretionary": 2021361155.0,
  "raum_non_discretionary": 0.0,
  "raum_band": "1b_5b",
  "raum_band_label": "$1 billion to $5 billion",
  "total_employees": 12,
  "advisory_employees": 4,
  "client_count_bucket": "fewer_than_5_in_some_types",
  "clients_by_type": {
    "other": {
      "raum": 0.0,
      "count": 0
    },
    "charitable": {
      "raum": 110002690.0,
      "count": null,
      "fewer_than_5": true
    },
    "individuals": {
      "raum": 0.0,
      "count": 0
    },
    "banking_thrift": {
      "raum": 0.0,
      "count": 0
    },
    "state_municipal": {
      "raum": 0.0,
      "count": 0
    },
    "insurance_companies": {
      "raum": 0.0,
      "count": 0
    },
    "investment_companies": {
      "raum": 1047307339.0,
      "count": 1
    },
    "pension_profit_sharing": {
      "raum": 0.0,
      "count": 0
    },
    "other_investment_advisers": {
      "raum": 0.0,
      "count": 0
    },
    "high_net_worth_individuals": {
      "raum": 267060525.0,
      "count": 14
    },
    "pooled_investment_vehicles": {
      "raum": 596990601.0,
      "count": 4
    },
    "corporations_other_businesses": {
      "raum": 0.0,
      "count": 0
    },
    "business_development_companies": {
      "raum": 0.0,
      "count": 0
    },
    "sovereign_wealth_foreign_official": {
      "raum": 0.0,
      "count": 0
    }
  },
  "compensation_types": [
    "percentage_of_aum",
    "performance_based"
  ],
  "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": [
    "FL",
    "MA"
  ],
  "websites": [
    "https://linkedin.com/company/portolan-capital-management",
    "https://portolan.com"
  ],
  "iapd_url": "https://adviserinfo.sec.gov/firm/summary/157542",
  "city_as_filed": "BOSTON",
  "url": "https://advisorcensus.com/firm/portolan-capital-management-llc-boston-ma-157542",
  "display_name": "Portolan Capital Management, LLC",
  "summary": "Portolan Capital Management, LLC is an SEC-registered investment advisory firm in Boston, MA, registered since 2012, reporting $1 billion to $5 billion in regulatory assets under management in its Form ADV filing dated April 15, 2026.",
  "citation": "AdvisorCensus. Portolan Capital Management, LLC (CRD 157542): Form ADV filing data as of October 2026.",
  "registration_type_label": "SEC-registered investment adviser",
  "compensation_labels": [
    "A percentage of assets under your management",
    "Performance-based fees"
  ],
  "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 Portolan Capital Management, LLC compensated?",
      "a": "On its Form ADV (Item 5.E, October 2026), Portolan Capital Management, LLC reports these compensation arrangements: a percentage of assets under its management; performance-based fees."
    },
    {
      "q": "Where is Portolan Capital Management, LLC located?",
      "a": "Portolan Capital Management, LLC's principal office is in Boston, MA, according to its Form ADV."
    },
    {
      "q": "Is Portolan Capital Management, LLC registered with the SEC or a state?",
      "a": "Portolan Capital Management, LLC is an SEC-registered investment advisory firm, registered since 2012. Status as filed: Approved. CRD 157542."
    },
    {
      "q": "How much does Portolan Capital Management, LLC manage?",
      "a": "Portolan Capital Management, LLC reports $2,021,361,155 in regulatory assets under management in its Form ADV filing dated April 15, 2026 (100% discretionary)."
    },
    {
      "q": "How have Portolan Capital Management, LLC's assets and staff changed since 2021?",
      "a": "In the Form ADV data for Portolan Capital Management, LLC: Regulatory assets under management: $1,224,603,076 in the October 2021 data and $2,021,361,155 in the October 2026 data, up 65%. Total employees: 11 in October 2021 and 12 in October 2026. Assets under management move with markets as well as with clients coming and going."
    },
    {
      "q": "What types of clients does Portolan Capital Management, LLC serve?",
      "a": "By number of clients on Form ADV Item 5.D: high net worth individuals (14); pooled investment vehicles (other than investment companies and business development companies) (4); investment companies (1)."
    },
    {
      "q": "Which custodians does Portolan Capital Management, LLC use?",
      "a": "Portolan Capital Management, LLC's most recent Form ADV filing (Schedule D, Section 5.K(3)) lists Fidelity Brokerage Services LLC and The Bank of New York Mellon as custodians holding 10% or more of its separately managed account assets."
    },
    {
      "q": "Does Portolan Capital Management, LLC 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/157542"
    },
    {
      "q": "What changed in Portolan Capital Management, LLC's recent Form ADV filings?",
      "a": "In the April 2026 filing data: Regulatory assets under management went from $1,581,996,022 to $2,021,361,155 (+28%)."
    }
  ],
  "filing_history": [
    {
      "period": "2021-10-01",
      "regulatory_assets_under_management": 1224603076.0,
      "total_employees": 11,
      "filing_date": "2021-05-04"
    },
    {
      "period": "2022-10-01",
      "regulatory_assets_under_management": 1560232109.0,
      "total_employees": 11,
      "filing_date": "2022-03-28"
    },
    {
      "period": "2023-10-01",
      "regulatory_assets_under_management": 1062967193.0,
      "total_employees": 12,
      "filing_date": "2023-03-31"
    },
    {
      "period": "2024-10-01",
      "regulatory_assets_under_management": 1218037689.0,
      "total_employees": 13,
      "filing_date": "2024-03-28"
    },
    {
      "period": "2025-10-01",
      "regulatory_assets_under_management": 1581996022.0,
      "total_employees": 12,
      "filing_date": "2025-03-31"
    },
    {
      "period": "2026-10-01",
      "regulatory_assets_under_management": 2021361155.0,
      "total_employees": 12,
      "filing_date": "2026-04-15"
    }
  ],
  "recent_changes": [
    {
      "period": "2026-04-01",
      "period_label": "April 2026",
      "notes": [
        "Regulatory assets under management went from $1,581,996,022 to $2,021,361,155 (+28%)."
      ]
    }
  ],
  "fees_from_brochure": null,
  "custodians": [
    {
      "name": "Fidelity Brokerage Services LLC",
      "name_as_filed": "FIDELITY BROKERAGE SERVICES LLC",
      "affiliated": false
    },
    {
      "name": "The Bank of New York Mellon",
      "name_as_filed": "THE BANK OF NEW YORK MELLON",
      "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/portolan-capital-management-llc-boston-ma-157542.md",
  "clients": [
    {
      "type": "individuals",
      "label": "Individuals (other than high net worth individuals)",
      "count": 0,
      "fewer_than_5": false,
      "raum": 0.0
    },
    {
      "type": "high_net_worth_individuals",
      "label": "High net worth individuals",
      "count": 14,
      "fewer_than_5": false,
      "raum": 267060525.0
    },
    {
      "type": "banking_thrift",
      "label": "Banking or thrift institutions",
      "count": 0,
      "fewer_than_5": false,
      "raum": 0.0
    },
    {
      "type": "investment_companies",
      "label": "Investment companies",
      "count": 1,
      "fewer_than_5": false,
      "raum": 1047307339.0
    },
    {
      "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": 4,
      "fewer_than_5": false,
      "raum": 596990601.0
    },
    {
      "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": 110002690.0
    },
    {
      "type": "state_municipal",
      "label": "State or municipal government entities (including government pension plans)",
      "count": 0,
      "fewer_than_5": false,
      "raum": 0.0
    },
    {
      "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": 0,
      "fewer_than_5": false,
      "raum": 0.0
    },
    {
      "type": "other",
      "label": "Other",
      "count": 0,
      "fewer_than_5": false,
      "raum": 0.0
    }
  ],
  "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/157542",
    "operator": "BH Monitor Services, LLC",
    "license": "https://creativecommons.org/licenses/by/4.0/",
    "credit": "AdvisorCensus (advisorcensus.com), from SEC Form ADV data"
  }
}