AdvisorCensus / Financial advisors / Massachusetts / Boston / MFS Investment Management
MFS Investment Management
Filed as MFS INVESTMENT MANAGEMENT · Legal name Massachusetts Financial Services Company
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.
Quick answers
From the filingHow is MFS Investment Management compensated?
On its Form ADV (Item 5.E, October 2026), MFS Investment Management reports these compensation arrangements: a percentage of assets under its management; other.
Where is MFS Investment Management located?
MFS Investment Management's principal office is in Boston, MA, according to its Form ADV.
Is MFS Investment Management registered with the SEC or a state?
MFS Investment Management is an SEC-registered investment advisory firm, registered since 1982. Status as filed: Approved. CRD 110045.
How much does MFS Investment Management manage?
MFS Investment Management reports $514,051,177,297 in regulatory assets under management in its Form ADV filing dated March 31, 2026 (93% discretionary).
How have MFS Investment Management's assets and staff changed since 2021?
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.
What types of clients does MFS Investment Management serve?
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).
Which custodians does MFS Investment Management use?
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.
Does MFS Investment Management report any disciplinary disclosures?
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
What changed in MFS Investment Management's recent Form ADV filings?
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).
From the Form ADV filing
Every figure below is as the firm filed it with regulators, as of October 2026.
How the firm is compensated
Item 5.E- A percentage of assets under your management
- Other
Item 5.E lists how the firm is compensated for its advice; Items 5.B, 6.A, and 7.A show whether its people or related companies can also earn commissions. Percentage of assets, fixed, hourly, subscription, and performance-based fees come from clients (a performance-based fee depends on investment results); commissions come with a sale or a trade, often from the company behind the product. How fees, commissions, and other arrangements differ
Fees and minimums
Form ADV Part 2ASee the firm's brochure (dated March 31, 2026) for its fees and any account minimum, on the SEC's IAPD site.
Regulatory assets under management
Item 5.F$514,051,177,297 as of October 2026, filing dated March 31, 2026.
A measure of scale, not skill or returns. Discretionary means the firm decides trades; non-discretionary means clients approve each one. What assets under management means
Who the firm serves
Item 5.DA firm with no individual clients is an institutional manager even if it manages billions; the mix tells you whom the practice is built around.
Advisory services
Item 5.G- 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
Registration and firm details
Items 1, 2, 5- Legal name
- Massachusetts Financial Services Company
- Also doing business as
- MASSACHUSETTS FINANCIAL SERVICES COMPANY
- Registration
- SEC-registered investment adviser. Status as filed: Approved.
- Registered since
- 1982 (44 years)
- Employees
- Total: 1,244. Performing investment advisory functions: 327.
- Wrap fee program participation
- No.
- Custodians (Schedule D, Section 5.K(3))
-
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.
- States registered or notice-filed
- Not reported.
SEC-registered investment advisers are examined by the SEC. SEC, state, and exempt registration
Disclosures
Item 114 Reports 4 disclosure items on Form ADV Item 11. View on IAPD.
Questions answered yes on this filing
Regulatory matters Items 11.C to 11.G
- 11.C(1) Has the SEC or the CFTC ever found that the firm or an advisory affiliate made a false statement or omission?
- 11.C(2) 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?
- 11.C(4) Has the SEC or the CFTC ever entered an order against the firm or an advisory affiliate in connection with investment-related activity?
- 11.C(5) 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?
Each question covers the firm and its advisory affiliates: its current employees other than clerical staff, its officers, partners, and directors, and anyone who controls the firm or is controlled by it. One event can produce yes answers to several questions. SEC-registered advisers and exempt reporting advisers may leave out events more than ten years old, and may answer 11.A(2) and 11.B(2) for pending charges only. What happened, and who was involved, is on the Disclosure Reporting Pages of the IAPD record. Reading a firm's disclosures
Assets and staff over time
Items 5.A, 5.F| Data period | Assets under management | Employees | Filing dated |
|---|---|---|---|
| October 2026 | $514,051,177,297 | 1,244 | March 31, 2026 |
| October 2025 | $473,025,951,992 | 1,271 | March 31, 2025 |
| October 2024 | $454,325,314,664 | 1,300 | July 25, 2024 |
| October 2023 | $417,408,071,971 | 1,200 | September 6, 2023 |
| October 2022 | $556,803,162,123 | 1,100 | May 26, 2022 |
| October 2021 | $495,512,689,615 | 1,500 | July 15, 2021 |
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.
As filed in each year's data for the same month. Assets under management move with markets as well as with clients coming and going; they measure scale, not skill or returns. Most firms update these figures once a year.
Changes in the filing
Last 12 months- April 2026
- Employees performing advisory functions went from 331 to 327.
- Updated its list of owners and control persons (Schedule A).
- February 2026
- Updated its list of owners and control persons (Schedule A).
- December 2025
- Item 11 disclosure answers changed: 4 yes answers, previously 7 (now no: 11.D(2), 11.D(4), 11.E(2)).
- November 2025
- Updated its list of owners and control persons (Schedule A).
Compared month to month from the SEC's monthly adviser data and the state compilation feed. Owners and control persons are summarized, never named.
Websites listed on Form ADV
Item 1.ISource: Form ADV, as of October 2026. Values appear as filed; a value the firm did not report is shown as "Not reported."
Cite this page
AdvisorCensus. MFS Investment Management (CRD 110045): Form ADV filing data as of October 2026. https://advisorcensus.com/firm/mfs-investment-management-boston-ma-110045