{
  "crd_number": 110045,
  "slug": "mfs-investment-management-boston-ma-110045",
  "primary_business_name": "MFS INVESTMENT MANAGEMENT",
  "legal_name": "MASSACHUSETTS FINANCIAL SERVICES COMPANY",
  "dbas": [
    "MASSACHUSETTS FINANCIAL SERVICES COMPANY"
  ],
  "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": "1982-05-20",
  "years_registered": 44,
  "period": "2026-10-01",
  "filing_date": "2026-03-31",
  "carried_forward": false,
  "raum_total": 514051177297.0,
  "raum_discretionary": 476823104264.0,
  "raum_non_discretionary": 37228073033.0,
  "raum_band": "over_5b",
  "raum_band_label": "Over $5 billion",
  "total_employees": 1244,
  "advisory_employees": 327,
  "client_count_bucket": null,
  "clients_by_type": {
    "other": {
      "raum": 0.0,
      "count": 0
    },
    "charitable": {
      "raum": 51059768.0,
      "count": 1
    },
    "individuals": {
      "raum": 0.0,
      "count": 0
    },
    "banking_thrift": {
      "raum": 0.0,
      "count": 0
    },
    "state_municipal": {
      "raum": 704813501.0,
      "count": 2
    },
    "insurance_companies": {
      "raum": 86544072.0,
      "count": 2
    },
    "investment_companies": {
      "raum": 436503794913.0,
      "count": 187
    },
    "pension_profit_sharing": {
      "raum": 3294871647.0,
      "count": 18
    },
    "other_investment_advisers": {
      "raum": 0.0,
      "count": 0
    },
    "high_net_worth_individuals": {
      "raum": 0.0,
      "count": 0
    },
    "pooled_investment_vehicles": {
      "raum": 70809843695.0,
      "count": 115
    },
    "corporations_other_businesses": {
      "raum": 142707230.0,
      "count": 26
    },
    "business_development_companies": {
      "raum": 0.0,
      "count": 0
    },
    "sovereign_wealth_foreign_official": {
      "raum": 2457542471.0,
      "count": 4
    }
  },
  "compensation_types": [
    "other",
    "percentage_of_aum"
  ],
  "advisory_activities": [
    "portfolio_management_businesses_institutional",
    "portfolio_management_investment_companies",
    "portfolio_management_pooled_vehicles"
  ],
  "wrap_fee_participant": false,
  "disclosure_yes_count": 4,
  "states_registered": [],
  "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/110045",
  "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-investment-management-boston-ma-110045",
  "display_name": "MFS Investment Management",
  "summary": "MFS Investment Management is an SEC-registered investment advisory firm in Boston, MA, registered since 1982, reporting over $5 billion in regulatory assets under management in its Form ADV filing dated March 31, 2026.",
  "citation": "AdvisorCensus. MFS Investment Management (CRD 110045): 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 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 MFS Investment Management compensated?",
      "a": "On its Form ADV (Item 5.E, October 2026), MFS Investment Management 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 MFS Investment Management located?",
      "a": "MFS Investment Management's principal office is in Boston, MA, according to its Form ADV."
    },
    {
      "q": "Is MFS Investment Management registered with the SEC or a state?",
      "a": "MFS Investment Management is an SEC-registered investment advisory firm, registered since 1982. Status as filed: Approved. CRD 110045."
    },
    {
      "q": "How much does MFS Investment Management manage?",
      "a": "MFS Investment Management reports $514,051,177,297 in regulatory assets under management in its Form ADV filing dated March 31, 2026 (93% discretionary)."
    },
    {
      "q": "How have MFS Investment Management's assets and staff changed since 2021?",
      "a": "In the Form ADV data for MFS Investment Management: Regulatory assets under management: $495,512,689,615 in the October 2021 data and $514,051,177,297 in the October 2026 data, up 4%. Total employees: 1,500 in October 2021 and 1,244 in October 2026. Assets under management move with markets as well as with clients coming and going."
    },
    {
      "q": "What types of clients does MFS Investment Management serve?",
      "a": "By number of clients on Form ADV Item 5.D: investment companies (187); pooled investment vehicles (other than investment companies and business development companies) (115); corporations or other businesses not listed above (26)."
    },
    {
      "q": "Which custodians does MFS Investment Management use?",
      "a": "MFS Investment Management's most recent Form ADV filing (Schedule D, Section 5.K(3)) lists Brown Brothers Harriman & Co., JP Morgan Chase Bank, N.A. London, State Street Bank and Trust Co., Sumitomo Mitsui Trust Bank (U.S.A.) Limited and The Northern Trust Company as custodians holding 10% or more of its separately managed account assets."
    },
    {
      "q": "Does MFS Investment Management 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/110045"
    },
    {
      "q": "What changed in MFS Investment Management's recent Form ADV filings?",
      "a": "In the April 2026 filing data: Employees performing advisory functions went from 331 to 327. Updated its list of owners and control persons (Schedule A)."
    }
  ],
  "filing_history": [
    {
      "period": "2021-10-01",
      "regulatory_assets_under_management": 495512689615.0,
      "total_employees": 1500,
      "filing_date": "2021-07-15"
    },
    {
      "period": "2022-10-01",
      "regulatory_assets_under_management": 556803162123.0,
      "total_employees": 1100,
      "filing_date": "2022-05-26"
    },
    {
      "period": "2023-10-01",
      "regulatory_assets_under_management": 417408071971.0,
      "total_employees": 1200,
      "filing_date": "2023-09-06"
    },
    {
      "period": "2024-10-01",
      "regulatory_assets_under_management": 454325314664.0,
      "total_employees": 1300,
      "filing_date": "2024-07-25"
    },
    {
      "period": "2025-10-01",
      "regulatory_assets_under_management": 473025951992.0,
      "total_employees": 1271,
      "filing_date": "2025-03-31"
    },
    {
      "period": "2026-10-01",
      "regulatory_assets_under_management": 514051177297.0,
      "total_employees": 1244,
      "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.",
        "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": "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": "Brown Brothers Harriman & Co.",
      "name_as_filed": "BROWN BROTHERS HARRIMAN & CO.",
      "affiliated": false
    },
    {
      "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": "Sumitomo Mitsui Trust Bank (U.S.A.) Limited",
      "name_as_filed": "SUMITOMO MITSUI TRUST BANK (U.S.A.) LIMITED",
      "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-investment-management-boston-ma-110045.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": 0,
      "fewer_than_5": false,
      "raum": 0.0
    },
    {
      "type": "banking_thrift",
      "label": "Banking or thrift institutions",
      "count": 0,
      "fewer_than_5": false,
      "raum": 0.0
    },
    {
      "type": "investment_companies",
      "label": "Investment companies",
      "count": 187,
      "fewer_than_5": false,
      "raum": 436503794913.0
    },
    {
      "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": 115,
      "fewer_than_5": false,
      "raum": 70809843695.0
    },
    {
      "type": "pension_profit_sharing",
      "label": "Pension and profit sharing plans (but not the plan participants or government pension plans)",
      "count": 18,
      "fewer_than_5": false,
      "raum": 3294871647.0
    },
    {
      "type": "charitable",
      "label": "Charitable organizations",
      "count": 1,
      "fewer_than_5": false,
      "raum": 51059768.0
    },
    {
      "type": "state_municipal",
      "label": "State or municipal government entities (including government pension plans)",
      "count": 2,
      "fewer_than_5": false,
      "raum": 704813501.0
    },
    {
      "type": "other_investment_advisers",
      "label": "Other investment advisers",
      "count": 0,
      "fewer_than_5": false,
      "raum": 0.0
    },
    {
      "type": "insurance_companies",
      "label": "Insurance companies",
      "count": 2,
      "fewer_than_5": false,
      "raum": 86544072.0
    },
    {
      "type": "sovereign_wealth_foreign_official",
      "label": "Sovereign wealth funds and foreign official institutions",
      "count": 4,
      "fewer_than_5": false,
      "raum": 2457542471.0
    },
    {
      "type": "corporations_other_businesses",
      "label": "Corporations or other businesses not listed above",
      "count": 26,
      "fewer_than_5": false,
      "raum": 142707230.0
    },
    {
      "type": "other",
      "label": "Other",
      "count": 0,
      "fewer_than_5": false,
      "raum": 0.0
    }
  ],
  "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/110045",
    "operator": "BH Monitor Services, LLC",
    "license": "https://creativecommons.org/licenses/by/4.0/",
    "credit": "AdvisorCensus (advisorcensus.com), from SEC Form ADV data"
  }
}