No commissions, no ads, no advice. This MassMutual profile draws only on public records, each linked so you can confirm it yourself.

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The short answer: is MassMutual a fiduciary?

It depends on your account: MassMutual is a fiduciary in its advisory programs, and follows the Regulation Best Interest standard as a broker. Publicly, it files with the SEC as MML Investors Services (CRD #10409). As of its latest Form ADV (filed September 3, 2026), the firm reported $115.6 billion in regulatory assets under management, with approximately 450,000 clients (454,836 exactly, per Form ADV Item 5.D). Its Form ADV (Item 5.E) lists how it is paid: a percentage of assets under management, hourly charges, fixed fees, and other. You don't have to take this on trust. You can pull the underlying filings and confirm them in minutes.

MassMutual is a dual registrant, so the standard of care changes with the type of account you hold. In its advisory programs it acts as an investment adviser with a fiduciary duty. In brokerage accounts it acts as a broker-dealer under Regulation Best Interest (a best-interest obligation at the time of a recommendation, not a continuous fiduciary relationship).

Our view: before anything else, ask your MassMutual representative to confirm in writing whether each of your accounts is advisory or brokerage. That one answer sets both the legal standard you're owed and the way you pay, so it's the first question we'd ask. Get started with Truthifi

What "fiduciary" means: a fiduciary is legally bound to place a client's interests above its own. (More on fiduciary duty)

MassMutual at a glance

✅ Verified from public filings, last checked October 5, 2026. MassMutual (SEC CRD #10409) is a fiduciary in its advisory programs, on a fee-based basis, with $115.6 billion in regulatory assets under management. Every figure below links to its primary source.

What	MassMutual	Source
SEC CRD	#10409	IAPD
Registration	Investment adviser and broker-dealer (dual registrant)	IAPD
Registered since	July 13, 1993 (SEC)	IAPD
Fiduciary?	Yes in advisory programs, Reg BI in brokerage	SEC Reg BI
Fee model	Fee-based (commissions + advisory)	Form ADV Item 5.E
How it's paid	A percentage of assets under management, hourly charges, fixed fees, and other	Form ADV Item 5.E
Regulatory Assets Under Management	$115.6 billion (Form ADV filed September 3, 2026)	IAPD
Client accounts	454,857 (229,410 discretionary)	IAPD
Employees	6,976 (4,961 in advisory roles)	IAPD
Ownership	Parent-owned	Form ADV Schedule A
Disclosures	Records carry disclosure items (common at this size). Review them directly	IAPD
HQ	Springfield, MA	IAPD

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MassMutual fees: what you'll pay

What MassMutual costs you tracks how it gets paid, and the fee structure spells that out. MassMutual fees depend on the account type: commissions in a brokerage account, an asset-based fee in an advisory program. A brokerage account typically carries commissions plus product costs, things like mutual fund sales loads, markups, and annuity commissions. That split can make brokerage accounts a better fit for buy-and-hold investors who trade rarely, since infrequent commissions may cost less than an ongoing asset-based fee. Active or larger portfolios may be better matched to an advisory program, where continuous fiduciary oversight can outweigh the cost of recurring trades. An advisory program instead charges an asset-based advisory fee rather than per-trade commissions, plus the underlying fund expenses. What you're paying comes down to which account you're in (Are you paying too much? Why that might be the wrong question). Its Form ADV (Item 5.E) lists how it is paid: a percentage of assets under management, hourly charges, fixed fees, and other.

Being fee-based means cost can come from both an advisory fee and commissions, depending on the account. For a model that takes no commissions at all, see Fee-only financial advisor: costs and how to find one.

Who owns MassMutual, and what conflicts does it disclose?

MassMutual's ownership is spelled out in the public record. MassMutual is owned by Massmutual Holding LLC, as listed in Schedule A of its Form ADV. (Form ADV Schedule A)

Its Form ADV Part 2A describes the firm's conflicts of interest, including how it and its advisers are paid.

MassMutual SEC record: disclosures

To check MassMutual's regulatory record, start with the firm's own filings. Like most large firms, MassMutual's regulatory records may carry disclosure items, and at that scale the number of disclosures is not by itself a measure of wrongdoing or of the firm's quality. A raw count can mix minor administrative items with serious ones, so the count alone may not tell you which kind you're looking at. Whatever matters to you is worth reading straight from the source. If there are MassMutual disclosures to read, the public record is where they are, and where they should be read.

On the record, according to its Form ADV, the firm has been registered with the SEC since July 13, 1993, makes notice filings in 50 jurisdictions, and reports 6,976 employees, 4,961 of them in investment advisory roles. "Is MassMutual legit?" comes up a lot. Its registration, CRD and filings are public and verifiable. That confirms it is a registered entity, not that it suits you. What deserves your attention is what you're paying and earning.

Reading MassMutual reviews against the public record

Star ratings and client comments capture what it felt like to work with a firm. They usually don't show what the firm reports to regulators. Before you weigh MassMutual reviews, check three things this profile takes from the public record. First, how the firm is paid: advisory accounts and brokerage accounts are compensated differently, which changes the standard that applies to your account. Second, who owns it and what conflicts it discloses. Third, whether its Form ADV reports any disciplinary history. Read reviews alongside the record, not instead of it. Other firms in the Truthifi /advisors hub are checked the same way.

How to verify MassMutual yourself

Here's how to confirm all of it in three steps:

1. Check the SEC adviser record (IAPD): https://adviserinfo.sec.gov/firm/summary/10409.
2. Read the filings (Form ADV / Form CRS): linked from the IAPD page.
3. Confirm the entity: match MassMutual (CRD #10409, legal name MML INVESTORS SERVICES, LLC) so you're reading the right firm.

What MassMutual does and who it serves

On its Form ADV, MassMutual reports providing financial planning, portfolio management for individuals, small businesses and institutions, pension consulting, selection of other advisers, and educational seminars.

It reports providing financial planning to about 22,000 clients in its last fiscal year (Form ADV Item 5.H), a count the form keeps separate from the client totals below.

Its Form ADV (Item 5.D) breaks its clients down by type, about 454,836 in all:

Client type	Clients	Assets managed
Individuals	447,952	$105.77 billion
High-net-worth individuals	885	$6.16 billion
Banking or thrift institutions	12	$91.6 million
Investment companies	1	$85,766
Pension and profit-sharing plans	3,379	$1.44 billion
Charities	733	$306.7 million
Corporations or other businesses	1,873	$1.87 billion
Other	1	None reported

According to the same filing, individuals make up about 98.5% of those clients and roughly 91.5% of regulatory assets ($105.77 billion of $115.6 billion).

It reports 454,857 client accounts (Item 5.F), about 50.4% of them discretionary (229,410, meaning the firm can trade without seeking your approval first) and 225,447 non-discretionary. The form counts accounts separately from clients, which is why this total differs slightly from the 454,836 clients in Item 5.D. Its main office is in Springfield, MA.

It reports that it or a related person has custody of certain client assets, which brings extra safeguards such as surprise examinations. The specifics are in its Form ADV.

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The firm checks out in minutes. The real work is seeing everything you hold, together.

Confirming MassMutual is registered takes a few minutes. However diligent the advisor, they see a fraction of the picture by default: the old 401(k) at a former employer, a spouse's holdings, fees folded into a fund. One line in the filing sharpens this. MassMutual reports financial planning for about 22,000 clients in its last fiscal year (Item 5.H), under 5% of its 454,836 clients, so most relationships there may not include a formal plan that inventories accounts held elsewhere. This is where Truthifi comes in.

How Truthifi can help

Truthifi links your accounts read-only and shows what you own, how it's allocated, how it's performing and where the risk sits, including single-stock exposure, returns next to a benchmark, a fee breakdown of the fees on each account, by type, and your Truthifi Score. You can share the accounts you choose with your advisor at MassMutual.

Prefer your own AI? A paid Truthifi plan lets you connect an AI assistant that supports MCP sign-in, such as Claude. Truthifi Connect is the lighter membership for people who only want to use their own assistant. Questions about your fees need Monitoring or Monitoring Plus+. See how Truthifi keeps your accounts secure

Ask AI about your MassMutual accounts

Once your accounts are connected read-only, you can ask in plain English:

• "What do I own across my MassMutual accounts and everything else, and how is it allocated?"
• "What am I paying in fees across all of these accounts?"

Try it with Truthifi: start for free at app.truthifi.com and run a Monitoring Checkup (limits apply).

No commissions, no ads, no advice: Truthifi is not an investment adviser and doesn't give investment, tax or legal advice. Its access to your bank and brokerage accounts is read-only. Start free (limits apply). Monitoring Checkup is free. Link up to 10 connections (per Truthifi's published plan limits). Plans and limits are on the pricing page → truthifi.com.

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FAQ

Is MassMutual a fiduciary? It depends on your account. In its advisory programs it acts as a fiduciary. In brokerage accounts it follows the SEC's Regulation Best Interest standard. Ask which type of account you have.

What are MassMutual's fees? They depend on the account. Brokerage accounts generally pay commissions and product charges. Advisory programs charge an asset-based fee instead of per-trade commissions, plus underlying fund costs. See the Form CRS.

Who owns MassMutual? MassMutual is owned by Massmutual Holding LLC, as listed in Schedule A of its Form ADV.

Does MassMutual have complaints or disclosures? Its regulatory records may carry disclosure items, as is common at its size. A disclosure is not proof of wrongdoing. Read any directly on BrokerCheck and the firm's Form ADV.

Is MassMutual a legitimate, registered firm? MassMutual is registered with the SEC (CRD #10409) and its filings are public on the SEC's IAPD site, which confirms it is a registered entity. Registration doesn't tell you whether it's the right fit or what you'll pay, so read the fee and conflict sections of its Form ADV.

Can AI help me check whether I'm getting good value? Yes. Start free (limits apply): Monitoring Checkup is free and lets you link up to 10 connections. You can also connect an AI assistant you already use (such as Claude). On Monitoring or Monitoring Plus+ you can ask it, in plain English, about the fees on each of your accounts. Truthifi is not an investment adviser and doesn't give investment, tax or legal advice.

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About this profile

Truthifi built this profile from the firm's own SEC filings (Form ADV and, where filed, Form CRS). Every page is reviewed by the Truthifi Team before publishing. The Truthifi advisor fact packs are an ongoing series checking U.S. investment advisers against their public filings, one firm at a time.

Read next from the Truthifi blog

• What is a fiduciary?
• Fee-only financial advisor: costs and how to find one
• Are you paying too much? Why that might be the wrong question
• How to ask AI about your real investment accounts
• Robo-advisor vs. human financial advisor: which is better?
• All advisor fact packs on Truthifi

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A note on sources. The facts on this page come from publicly available documents, MassMutual's SEC and FINRA filings, each linked inline so you can verify it yourself (SEC data current as of October 5, 2026). This is general information, not financial or legal advice, and Truthifi is not affiliated with MassMutual. Regulatory records change, so confirm against the official sources linked above. Spot something that should be corrected? Email us at support@truthifi.com. Because the firm amends its Form ADV over time, this page is a snapshot of the October 5, 2026 record, and the next amendment is the one worth rereading.