{
  "crd_number": 107412,
  "slug": "mason-capital-partners-boston-ma-107412",
  "primary_business_name": "MASON CAPITAL PARTNERS",
  "legal_name": "ALBERT D MASON INC",
  "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": "1976-07-29",
  "years_registered": 50,
  "period": "2026-10-01",
  "filing_date": "2026-03-31",
  "carried_forward": false,
  "raum_total": 210604947.0,
  "raum_discretionary": 210604947.0,
  "raum_non_discretionary": 0.0,
  "raum_band": "100m_500m",
  "raum_band_label": "$100 million to $500 million",
  "total_employees": 7,
  "advisory_employees": 4,
  "client_count_bucket": "fewer_than_5_in_some_types",
  "clients_by_type": {
    "charitable": {
      "raum": 0.0,
      "count": null,
      "fewer_than_5": true
    },
    "individuals": {
      "raum": 19123063.0,
      "count": 81
    },
    "banking_thrift": {
      "raum": 0.0,
      "count": null,
      "fewer_than_5": true
    },
    "state_municipal": {
      "raum": 0.0,
      "count": null,
      "fewer_than_5": true
    },
    "insurance_companies": {
      "raum": 0.0,
      "count": null,
      "fewer_than_5": true
    },
    "investment_companies": {
      "raum": 0.0,
      "count": 0
    },
    "pension_profit_sharing": {
      "raum": 7115498.0,
      "count": null,
      "fewer_than_5": true
    },
    "other_investment_advisers": {
      "raum": 0.0,
      "count": null,
      "fewer_than_5": true
    },
    "high_net_worth_individuals": {
      "raum": 122257474.0,
      "count": 96
    },
    "pooled_investment_vehicles": {
      "raum": 60111930.0,
      "count": 2
    },
    "corporations_other_businesses": {
      "raum": 1996982.0,
      "count": null,
      "fewer_than_5": true
    },
    "business_development_companies": {
      "raum": 0.0,
      "count": 0
    },
    "sovereign_wealth_foreign_official": {
      "raum": 0.0,
      "count": null,
      "fewer_than_5": true
    }
  },
  "compensation_types": [
    "percentage_of_aum"
  ],
  "advisory_activities": [
    "portfolio_management_businesses_institutional",
    "portfolio_management_individuals",
    "portfolio_management_pooled_vehicles"
  ],
  "wrap_fee_participant": false,
  "disclosure_yes_count": 0,
  "states_registered": [
    "CA",
    "CO",
    "FL",
    "MA",
    "ME",
    "NJ",
    "NY"
  ],
  "websites": [
    "https://facebook.com/mason.capital.1",
    "https://fundamentalsfirstfund.com",
    "https://instagram.com/know.etf",
    "https://linkedin.com/company/mason-capital-partners-boston",
    "https://mason-capital.com",
    "https://youtube.com/@MasonCapitalPartners"
  ],
  "iapd_url": "https://adviserinfo.sec.gov/firm/summary/107412",
  "city_as_filed": "BOSTON",
  "url": "https://advisorcensus.com/firm/mason-capital-partners-boston-ma-107412",
  "display_name": "Mason Capital Partners",
  "summary": "Mason Capital Partners is an SEC-registered investment advisory firm in Boston, MA, registered since 1976, reporting $100 million to $500 million in regulatory assets under management in its Form ADV filing dated March 31, 2026.",
  "citation": "AdvisorCensus. Mason Capital Partners (CRD 107412): Form ADV filing data as of October 2026.",
  "registration_type_label": "SEC-registered investment adviser",
  "compensation_labels": [
    "A percentage of assets under your management"
  ],
  "advisory_activity_labels": [
    "Portfolio management for individuals and/or small businesses",
    "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 Mason Capital Partners compensated?",
      "a": "On its Form ADV (Item 5.E, October 2026), Mason Capital Partners reports these compensation arrangements: a percentage of assets under its management."
    },
    {
      "q": "What does Mason Capital Partners' brochure say about its fees?",
      "a": "Its Form ADV Part 2A brochure dated March 31, 2026 states: Asset-based fee: 1% of assets a year. Fees can differ by service and may be negotiable; the brochure is the complete statement."
    },
    {
      "q": "Where is Mason Capital Partners located?",
      "a": "Mason Capital Partners' principal office is in Boston, MA, according to its Form ADV."
    },
    {
      "q": "Is Mason Capital Partners registered with the SEC or a state?",
      "a": "Mason Capital Partners is an SEC-registered investment advisory firm, registered since 1976. Status as filed: Approved. CRD 107412."
    },
    {
      "q": "How much does Mason Capital Partners manage?",
      "a": "Mason Capital Partners reports $210,604,947 in regulatory assets under management in its Form ADV filing dated March 31, 2026 (100% discretionary)."
    },
    {
      "q": "How have Mason Capital Partners' assets and staff changed since 2021?",
      "a": "In the Form ADV data for Mason Capital Partners: Regulatory assets under management: $192,226,032 in the October 2021 data and $210,604,947 in the October 2026 data, up 10%. Total employees: 6 in October 2021 and 7 in October 2026. Assets under management move with markets as well as with clients coming and going."
    },
    {
      "q": "What types of clients does Mason Capital Partners serve?",
      "a": "By number of clients on Form ADV Item 5.D: high net worth individuals (96); individuals (other than high net worth individuals) (81); pooled investment vehicles (other than investment companies and business development companies) (2)."
    },
    {
      "q": "Which custodians does Mason Capital Partners use?",
      "a": "Mason Capital Partners' most recent Form ADV filing (Schedule D, Section 5.K(3)) lists Charles Schwab & Co., Inc. as a custodian holding 10% or more of its separately managed account assets."
    },
    {
      "q": "Does Mason Capital 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/107412"
    },
    {
      "q": "What changed in Mason Capital Partners' recent Form ADV filings?",
      "a": "In the January 2026 filing data: No longer registered or notice-filed in MD, NC."
    }
  ],
  "filing_history": [
    {
      "period": "2021-10-01",
      "regulatory_assets_under_management": 192226032.0,
      "total_employees": 6,
      "filing_date": "2021-03-24"
    },
    {
      "period": "2022-10-01",
      "regulatory_assets_under_management": 213823180.0,
      "total_employees": 6,
      "filing_date": "2022-03-30"
    },
    {
      "period": "2023-10-01",
      "regulatory_assets_under_management": 183735886.0,
      "total_employees": 6,
      "filing_date": "2023-03-22"
    },
    {
      "period": "2024-10-01",
      "regulatory_assets_under_management": 200538117.0,
      "total_employees": 6,
      "filing_date": "2024-03-26"
    },
    {
      "period": "2025-10-01",
      "regulatory_assets_under_management": 201988017.0,
      "total_employees": 7,
      "filing_date": "2025-03-26"
    },
    {
      "period": "2026-10-01",
      "regulatory_assets_under_management": 210604947.0,
      "total_employees": 7,
      "filing_date": "2026-03-31"
    }
  ],
  "recent_changes": [
    {
      "period": "2026-01-01",
      "period_label": "January 2026",
      "notes": [
        "No longer registered or notice-filed in MD, NC."
      ]
    }
  ],
  "fees_from_brochure": {
    "source": "Form ADV Part 2A brochure dated March 31, 2026",
    "tiers": [],
    "flat_rate": "1% of assets a year",
    "stated_range": null,
    "stated_maximum": null,
    "account_minimum": null,
    "account_minimum_may_be_waived": false,
    "minimum_annual_fee": null,
    "figures": [
      {
        "label": "Asset-based fee",
        "statements": [
          "Asset-based fee: 1% of assets a year"
        ],
        "quotes": [
          "The fees are generally charged at a rate of 1% (100 bps) per annum with some exceptions. The fee is typically charged quarterly in arrears based on the asset value at quarter end."
        ]
      }
    ],
    "quotes": [
      "The fees are generally charged at a rate of 1% (100 bps) per annum with some exceptions. The fee is typically charged quarterly in arrears based on the asset value at quarter end."
    ],
    "note": "As stated in the firm's brochure; fees can differ by service and may be negotiable."
  },
  "custodians": [
    {
      "name": "Charles Schwab & Co., Inc.",
      "name_as_filed": "CHARLES SCHWAB & CO., INC.",
      "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/mason-capital-partners-boston-ma-107412.md",
  "clients": [
    {
      "type": "individuals",
      "label": "Individuals (other than high net worth individuals)",
      "count": 81,
      "fewer_than_5": false,
      "raum": 19123063.0
    },
    {
      "type": "high_net_worth_individuals",
      "label": "High net worth individuals",
      "count": 96,
      "fewer_than_5": false,
      "raum": 122257474.0
    },
    {
      "type": "banking_thrift",
      "label": "Banking or thrift institutions",
      "count": null,
      "fewer_than_5": true,
      "raum": 0.0
    },
    {
      "type": "investment_companies",
      "label": "Investment companies",
      "count": 0,
      "fewer_than_5": false,
      "raum": 0.0
    },
    {
      "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": 2,
      "fewer_than_5": false,
      "raum": 60111930.0
    },
    {
      "type": "pension_profit_sharing",
      "label": "Pension and profit sharing plans (but not the plan participants or government pension plans)",
      "count": null,
      "fewer_than_5": true,
      "raum": 7115498.0
    },
    {
      "type": "charitable",
      "label": "Charitable organizations",
      "count": null,
      "fewer_than_5": true,
      "raum": 0.0
    },
    {
      "type": "state_municipal",
      "label": "State or municipal government entities (including government pension plans)",
      "count": null,
      "fewer_than_5": true,
      "raum": 0.0
    },
    {
      "type": "other_investment_advisers",
      "label": "Other investment advisers",
      "count": null,
      "fewer_than_5": true,
      "raum": 0.0
    },
    {
      "type": "insurance_companies",
      "label": "Insurance companies",
      "count": null,
      "fewer_than_5": true,
      "raum": 0.0
    },
    {
      "type": "sovereign_wealth_foreign_official",
      "label": "Sovereign wealth funds and foreign official institutions",
      "count": null,
      "fewer_than_5": true,
      "raum": 0.0
    },
    {
      "type": "corporations_other_businesses",
      "label": "Corporations or other businesses not listed above",
      "count": null,
      "fewer_than_5": true,
      "raum": 1996982.0
    }
  ],
  "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/107412",
    "operator": "BH Monitor Services, LLC",
    "license": "https://creativecommons.org/licenses/by/4.0/",
    "credit": "AdvisorCensus (advisorcensus.com), from SEC Form ADV data"
  }
}