{
  "crd_number": 301116,
  "slug": "ardsley-partners-norwalk-ct-301116",
  "primary_business_name": "ARDSLEY PARTNERS",
  "legal_name": "ARDSLEY ADVISORY PARTNERS LP",
  "dbas": [],
  "city": "Norwalk",
  "state": "CT",
  "country": "United States",
  "cbsa_code": "14860",
  "metro": {
    "cbsa_code": "14860",
    "common_name": "Bridgeport",
    "msa_name": "Bridgeport-Stamford-Danbury, CT",
    "path": "/advisors/ct/bridgeport"
  },
  "registration_type": "sec",
  "registration_status": "Approved",
  "registration_date": "2019-03-27",
  "years_registered": 7,
  "period": "2026-10-01",
  "filing_date": "2026-05-06",
  "carried_forward": false,
  "raum_total": 1635701621.0,
  "raum_discretionary": 1635701621.0,
  "raum_non_discretionary": 0.0,
  "raum_band": "1b_5b",
  "raum_band_label": "$1 billion to $5 billion",
  "total_employees": 11,
  "advisory_employees": 7,
  "client_count_bucket": null,
  "clients_by_type": {
    "other": {
      "raum": 209498405.0,
      "count": 2,
      "description": "FAMILY OFFICE"
    },
    "pooled_investment_vehicles": {
      "raum": 1426203216.0,
      "count": 9
    }
  },
  "compensation_types": [
    "percentage_of_aum",
    "performance_based"
  ],
  "advisory_activities": [
    "portfolio_management_businesses_institutional",
    "portfolio_management_pooled_vehicles"
  ],
  "wrap_fee_participant": false,
  "disclosure_yes_count": 0,
  "states_registered": [
    "CT"
  ],
  "websites": [
    "https://ardsley.com"
  ],
  "iapd_url": "https://adviserinfo.sec.gov/firm/summary/301116",
  "city_as_filed": "NORWALK",
  "url": "https://advisorcensus.com/firm/ardsley-partners-norwalk-ct-301116",
  "display_name": "Ardsley Partners",
  "summary": "Ardsley Partners is an SEC-registered investment advisory firm in Norwalk, CT, registered since 2019, reporting $1 billion to $5 billion in regulatory assets under management in its Form ADV filing dated May 6, 2026.",
  "citation": "AdvisorCensus. Ardsley Partners (CRD 301116): 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 pooled investment vehicles (other than investment companies)",
    "Portfolio management for businesses (other than small businesses) or institutional clients"
  ],
  "quick_answers": [
    {
      "q": "How is Ardsley Partners compensated?",
      "a": "On its Form ADV (Item 5.E, October 2026), Ardsley Partners reports these compensation arrangements: a percentage of assets under its management; performance-based fees. The amounts are in Item 5 of its Form ADV Part 2A brochure."
    },
    {
      "q": "Where is Ardsley Partners located?",
      "a": "Ardsley Partners' principal office is in Norwalk, CT, according to its Form ADV."
    },
    {
      "q": "Is Ardsley Partners registered with the SEC or a state?",
      "a": "Ardsley Partners is an SEC-registered investment advisory firm, registered since 2019. Status as filed: Approved. CRD 301116."
    },
    {
      "q": "How much does Ardsley Partners manage?",
      "a": "Ardsley Partners reports $1,635,701,621 in regulatory assets under management in its Form ADV filing dated May 6, 2026 (100% discretionary)."
    },
    {
      "q": "How have Ardsley Partners' assets and staff changed since 2021?",
      "a": "In the Form ADV data for Ardsley Partners: Regulatory assets under management: $1,197,794,786 in the October 2021 data and $1,635,701,621 in the October 2026 data, up 37%. Total employees: 12 in October 2021 and 11 in October 2026. Assets under management move with markets as well as with clients coming and going."
    },
    {
      "q": "What types of clients does Ardsley Partners serve?",
      "a": "By number of clients on Form ADV Item 5.D: pooled investment vehicles (other than investment companies and business development companies) (9); other (2)."
    },
    {
      "q": "Which custodians does Ardsley Partners use?",
      "a": "Ardsley Partners' most recent Form ADV filing (Schedule D, Section 5.K(3)) lists Morgan Stanley & Co. LLC as a custodian holding 10% or more of its separately managed account assets."
    },
    {
      "q": "Does Ardsley Partners 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/301116"
    },
    {
      "q": "What changed in Ardsley Partners' recent Form ADV filings?",
      "a": "In the March 2026 filing data: Employees performing advisory functions went from 9 to 7. Regulatory assets under management went from $1,143,814,787 to $1,635,701,621 (+43%)."
    }
  ],
  "filing_history": [
    {
      "period": "2021-10-01",
      "regulatory_assets_under_management": 1197794786.0,
      "total_employees": 12,
      "filing_date": "2021-03-10"
    },
    {
      "period": "2022-10-01",
      "regulatory_assets_under_management": 851898478.0,
      "total_employees": 12,
      "filing_date": "2022-03-02"
    },
    {
      "period": "2023-10-01",
      "regulatory_assets_under_management": 789305344.0,
      "total_employees": 12,
      "filing_date": "2023-06-07"
    },
    {
      "period": "2024-10-01",
      "regulatory_assets_under_management": 869605434.0,
      "total_employees": 13,
      "filing_date": "2024-01-30"
    },
    {
      "period": "2025-10-01",
      "regulatory_assets_under_management": 1143814787.0,
      "total_employees": 14,
      "filing_date": "2025-05-14"
    },
    {
      "period": "2026-10-01",
      "regulatory_assets_under_management": 1635701621.0,
      "total_employees": 11,
      "filing_date": "2026-05-06"
    }
  ],
  "recent_changes": [
    {
      "period": "2026-03-01",
      "period_label": "March 2026",
      "notes": [
        "Employees performing advisory functions went from 9 to 7.",
        "Regulatory assets under management went from $1,143,814,787 to $1,635,701,621 (+43%)."
      ]
    }
  ],
  "fees_from_brochure": null,
  "custodians": [
    {
      "name": "Morgan Stanley & Co. LLC",
      "name_as_filed": "MORGAN STANLEY & CO. LLC",
      "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/ardsley-partners-norwalk-ct-301116.md",
  "clients": [
    {
      "type": "pooled_investment_vehicles",
      "label": "Pooled investment vehicles (other than investment companies and business development companies)",
      "count": 9,
      "fewer_than_5": false,
      "raum": 1426203216.0
    },
    {
      "type": "other",
      "label": "Other",
      "count": 2,
      "fewer_than_5": false,
      "raum": 209498405.0
    }
  ],
  "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/301116",
    "operator": "BH Monitor Services, LLC",
    "license": "https://creativecommons.org/licenses/by/4.0/",
    "credit": "AdvisorCensus (advisorcensus.com), from SEC Form ADV data"
  }
}