{
  "crd_number": 107144,
  "slug": "mfs-institutional-advisors-inc-boston-ma-107144",
  "primary_business_name": "MFS INSTITUTIONAL ADVISORS INC.",
  "legal_name": "MFS INSTITUTIONAL ADVISORS 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": "1994-05-06",
  "years_registered": 32,
  "period": "2026-10-01",
  "filing_date": "2026-03-31",
  "carried_forward": false,
  "raum_total": 113585882234.0,
  "raum_discretionary": 113585882234.0,
  "raum_non_discretionary": 0.0,
  "raum_band": "over_5b",
  "raum_band_label": "Over $5 billion",
  "total_employees": 1311,
  "advisory_employees": 327,
  "client_count_bucket": null,
  "clients_by_type": {
    "other": {
      "raum": 2186028597.0,
      "count": 3294,
      "description": "SEE SCHEDULE D - MISCELLANEOUS"
    },
    "charitable": {
      "raum": 1850144858.0,
      "count": 116
    },
    "individuals": {
      "raum": 2177402717.0,
      "count": 9145
    },
    "banking_thrift": {
      "raum": 0.0,
      "count": 0
    },
    "state_municipal": {
      "raum": 19672263617.0,
      "count": 51
    },
    "insurance_companies": {
      "raum": 7789035011.0,
      "count": 37
    },
    "investment_companies": {
      "raum": 748566567.0,
      "count": 2
    },
    "pension_profit_sharing": {
      "raum": 17007253022.0,
      "count": 253
    },
    "other_investment_advisers": {
      "raum": 0.0,
      "count": 0
    },
    "high_net_worth_individuals": {
      "raum": 1022020126.0,
      "count": 407
    },
    "pooled_investment_vehicles": {
      "raum": 45968149355.0,
      "count": 124
    },
    "corporations_other_businesses": {
      "raum": 606347072.0,
      "count": 114
    },
    "business_development_companies": {
      "raum": 0.0,
      "count": 0
    },
    "sovereign_wealth_foreign_official": {
      "raum": 14558671292.0,
      "count": 12
    }
  },
  "compensation_types": [
    "other",
    "percentage_of_aum",
    "performance_based"
  ],
  "advisory_activities": [
    "pension_consulting",
    "portfolio_management_businesses_institutional",
    "portfolio_management_individuals",
    "portfolio_management_investment_companies",
    "portfolio_management_pooled_vehicles",
    "selection_of_other_advisers"
  ],
  "wrap_fee_participant": true,
  "disclosure_yes_count": 4,
  "states_registered": [
    "AK",
    "AL",
    "AR",
    "AZ",
    "CA",
    "CO",
    "CT",
    "DC",
    "DE",
    "FL",
    "GA",
    "HI",
    "IA",
    "ID",
    "IL",
    "IN",
    "KS",
    "KY",
    "LA",
    "MA",
    "MD",
    "ME",
    "MI",
    "MN",
    "MO",
    "MS",
    "MT",
    "NC",
    "ND",
    "NE",
    "NH",
    "NJ",
    "NM",
    "NV",
    "NY",
    "OH",
    "OK",
    "OR",
    "PA",
    "PR",
    "RI",
    "SC",
    "SD",
    "TN",
    "TX",
    "UT",
    "VA",
    "VI",
    "VT",
    "WA",
    "WI",
    "WV",
    "WY"
  ],
  "websites": [
    "https://facebook.com/followmfs",
    "https://linkedin.com/company/mfs-investment-management",
    "https://mfs.com",
    "https://twitter.com/followmfs",
    "https://xing.com/pages/mfs-investment-management",
    "https://youtube.com/user/followmfs"
  ],
  "iapd_url": "https://adviserinfo.sec.gov/firm/summary/107144",
  "disclosure_items": [
    {
      "item": "11.C(1)",
      "question": "Has the SEC or the CFTC ever found that the firm or an advisory affiliate made a false statement or omission?"
    },
    {
      "item": "11.C(2)",
      "question": "Has the SEC or the CFTC ever found that the firm or an advisory affiliate was involved in a violation of SEC or CFTC regulations or statutes?"
    },
    {
      "item": "11.C(4)",
      "question": "Has the SEC or the CFTC ever entered an order against the firm or an advisory affiliate in connection with investment-related activity?"
    },
    {
      "item": "11.C(5)",
      "question": "Has the SEC or the CFTC ever imposed a civil money penalty on the firm or an advisory affiliate, or ordered the firm or an advisory affiliate to cease and desist from an activity?"
    }
  ],
  "city_as_filed": "BOSTON",
  "url": "https://advisorcensus.com/firm/mfs-institutional-advisors-inc-boston-ma-107144",
  "display_name": "MFS Institutional Advisors Inc.",
  "summary": "MFS Institutional Advisors Inc. is an SEC-registered investment advisory firm in Boston, MA, registered since 1994, reporting over $5 billion in regulatory assets under management in its Form ADV filing dated March 31, 2026.",
  "citation": "AdvisorCensus. MFS Institutional Advisors Inc. (CRD 107144): 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",
    "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",
    "Pension consulting services",
    "Selection of other advisers (including private fund managers)"
  ],
  "quick_answers": [
    {
      "q": "How is MFS Institutional Advisors Inc. compensated?",
      "a": "On its Form ADV (Item 5.E, October 2026), MFS Institutional Advisors Inc. reports these compensation arrangements: a percentage of assets under its management; performance-based fees; other."
    },
    {
      "q": "Where is MFS Institutional Advisors Inc. located?",
      "a": "MFS Institutional Advisors Inc.'s principal office is in Boston, MA, according to its Form ADV."
    },
    {
      "q": "Is MFS Institutional Advisors Inc. registered with the SEC or a state?",
      "a": "MFS Institutional Advisors Inc. is an SEC-registered investment advisory firm, registered since 1994. Status as filed: Approved. CRD 107144."
    },
    {
      "q": "How much does MFS Institutional Advisors Inc. manage?",
      "a": "MFS Institutional Advisors Inc. reports $113,585,882,234 in regulatory assets under management in its Form ADV filing dated March 31, 2026 (100% discretionary)."
    },
    {
      "q": "How have MFS Institutional Advisors Inc.'s assets and staff changed since 2021?",
      "a": "In the Form ADV data for MFS Institutional Advisors Inc.: Regulatory assets under management: $134,339,947,746 in the October 2021 data and $113,585,882,234 in the October 2026 data, down 15%. Total employees: 1,500 in October 2021 and 1,311 in October 2026. Assets under management move with markets as well as with clients coming and going."
    },
    {
      "q": "What types of clients does MFS Institutional Advisors Inc. serve?",
      "a": "By number of clients on Form ADV Item 5.D: individuals (other than high net worth individuals) (9,145); other (3,294); high net worth individuals (407)."
    },
    {
      "q": "Which custodians does MFS Institutional Advisors Inc. use?",
      "a": "MFS Institutional Advisors Inc.'s most recent Form ADV filing (Schedule D, Section 5.K(3)) lists JP Morgan Chase Bank, N.A. London, State Street Bank and Trust Co., The Bank of New York Mellon and The Northern Trust Company as custodians holding 10% or more of its separately managed account assets."
    },
    {
      "q": "Does MFS Institutional Advisors Inc. report any disciplinary disclosures?",
      "a": "Reports 4 disclosure items on Form ADV Item 11: yes answers to 11.C(1) (SEC or CFTC finding of a false statement or omission), 11.C(2) (SEC or CFTC finding of a violation), 11.C(4) (SEC or CFTC order), and 11.C(5) (SEC or CFTC civil money penalty or cease-and-desist order). Each question covers the firm and its advisory affiliates, and one event can produce several yes answers. The detail of any item is on the firm's SEC record: https://adviserinfo.sec.gov/firm/summary/107144"
    },
    {
      "q": "What changed in MFS Institutional Advisors Inc.'s recent Form ADV filings?",
      "a": "In the April 2026 filing data: Employees performing advisory functions went from 331 to 327."
    }
  ],
  "filing_history": [
    {
      "period": "2021-10-01",
      "regulatory_assets_under_management": 134339947746.0,
      "total_employees": 1500,
      "filing_date": "2021-05-12"
    },
    {
      "period": "2022-10-01",
      "regulatory_assets_under_management": 146411056016.0,
      "total_employees": 1200,
      "filing_date": "2022-03-31"
    },
    {
      "period": "2023-10-01",
      "regulatory_assets_under_management": 116842935821.0,
      "total_employees": 1300,
      "filing_date": "2023-03-31"
    },
    {
      "period": "2024-10-01",
      "regulatory_assets_under_management": 128519177590.0,
      "total_employees": 1300,
      "filing_date": "2024-03-28"
    },
    {
      "period": "2025-10-01",
      "regulatory_assets_under_management": 111845233320.0,
      "total_employees": 1331,
      "filing_date": "2025-03-31"
    },
    {
      "period": "2026-10-01",
      "regulatory_assets_under_management": 113585882234.0,
      "total_employees": 1311,
      "filing_date": "2026-03-31"
    }
  ],
  "recent_changes": [
    {
      "period": "2026-04-01",
      "period_label": "April 2026",
      "notes": [
        "Employees performing advisory functions went from 331 to 327."
      ]
    },
    {
      "period": "2026-03-01",
      "period_label": "March 2026",
      "notes": [
        "Updated its list of owners and control persons (Schedule A)."
      ]
    },
    {
      "period": "2026-02-01",
      "period_label": "February 2026",
      "notes": [
        "Updated its list of owners and control persons (Schedule A)."
      ]
    },
    {
      "period": "2026-01-01",
      "period_label": "January 2026",
      "notes": [
        "Updated its list of owners and control persons (Schedule A)."
      ]
    },
    {
      "period": "2025-12-01",
      "period_label": "December 2025",
      "notes": [
        "Item 11 disclosure answers changed: 4 yes answers, previously 7 (now no: 11.D(2), 11.D(4), 11.E(2))."
      ]
    },
    {
      "period": "2025-11-01",
      "period_label": "November 2025",
      "notes": [
        "Updated its list of owners and control persons (Schedule A)."
      ]
    }
  ],
  "fees_from_brochure": null,
  "custodians": [
    {
      "name": "JP Morgan Chase Bank, N.A. London",
      "name_as_filed": "JP MORGAN CHASE BANK, N.A. LONDON",
      "affiliated": false
    },
    {
      "name": "State Street Bank and Trust Co.",
      "name_as_filed": "STATE STREET BANK AND TRUST CO.",
      "affiliated": false
    },
    {
      "name": "The Bank of New York Mellon",
      "name_as_filed": "THE BANK OF NEW YORK MELLON",
      "affiliated": false
    },
    {
      "name": "The Northern Trust Company",
      "name_as_filed": "THE NORTHERN TRUST COMPANY",
      "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/mfs-institutional-advisors-inc-boston-ma-107144.md",
  "clients": [
    {
      "type": "individuals",
      "label": "Individuals (other than high net worth individuals)",
      "count": 9145,
      "fewer_than_5": false,
      "raum": 2177402717.0
    },
    {
      "type": "high_net_worth_individuals",
      "label": "High net worth individuals",
      "count": 407,
      "fewer_than_5": false,
      "raum": 1022020126.0
    },
    {
      "type": "banking_thrift",
      "label": "Banking or thrift institutions",
      "count": 0,
      "fewer_than_5": false,
      "raum": 0.0
    },
    {
      "type": "investment_companies",
      "label": "Investment companies",
      "count": 2,
      "fewer_than_5": false,
      "raum": 748566567.0
    },
    {
      "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": 124,
      "fewer_than_5": false,
      "raum": 45968149355.0
    },
    {
      "type": "pension_profit_sharing",
      "label": "Pension and profit sharing plans (but not the plan participants or government pension plans)",
      "count": 253,
      "fewer_than_5": false,
      "raum": 17007253022.0
    },
    {
      "type": "charitable",
      "label": "Charitable organizations",
      "count": 116,
      "fewer_than_5": false,
      "raum": 1850144858.0
    },
    {
      "type": "state_municipal",
      "label": "State or municipal government entities (including government pension plans)",
      "count": 51,
      "fewer_than_5": false,
      "raum": 19672263617.0
    },
    {
      "type": "other_investment_advisers",
      "label": "Other investment advisers",
      "count": 0,
      "fewer_than_5": false,
      "raum": 0.0
    },
    {
      "type": "insurance_companies",
      "label": "Insurance companies",
      "count": 37,
      "fewer_than_5": false,
      "raum": 7789035011.0
    },
    {
      "type": "sovereign_wealth_foreign_official",
      "label": "Sovereign wealth funds and foreign official institutions",
      "count": 12,
      "fewer_than_5": false,
      "raum": 14558671292.0
    },
    {
      "type": "corporations_other_businesses",
      "label": "Corporations or other businesses not listed above",
      "count": 114,
      "fewer_than_5": false,
      "raum": 606347072.0
    },
    {
      "type": "other",
      "label": "Other",
      "count": 3294,
      "fewer_than_5": false,
      "raum": 2186028597.0
    }
  ],
  "disclosure_line": "Reports 4 disclosure items on Form ADV Item 11.",
  "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/107144",
    "operator": "BH Monitor Services, LLC",
    "license": "https://creativecommons.org/licenses/by/4.0/",
    "credit": "AdvisorCensus (advisorcensus.com), from SEC Form ADV data"
  }
}