What Is a Family Office? The SEC Rule and a 2026 Census

The legal definition: three conditions, all required

Before 2011 many family offices relied on the “private adviser” exemption from SEC registration for advisers with fewer than 15 clients, and others obtained individual SEC exemptive orders. The Dodd-Frank Act repealed that exemption, effective July 21, 2011, and in its place added Section 202(a)(11)(G) to the Advisers Act (15 U.S.C. 80b-2(a)(11)(G)), which removes from the definition of investment adviser “any family office, as defined by rule, regulation, or order of the Commission, in accordance with the purposes of this subchapter”. The SEC's definition is Rule 202(a)(11)(G)-1. Paragraph (a) is the whole point: “A family office, as defined in this section, shall not be considered to be an investment adviser for purpose of the Act.”

Paragraph (b) says a family office is a company, including its directors, partners, members, managers, trustees and employees acting within their roles, that meets all three of these tests:

Source: 17 CFR 275.202(a)(11)(G)-1(b), eCFR current to October 8, 2026. The third column is our reading.

A grandfather clause in paragraph (c), written into the Dodd-Frank Act itself, keeps some offices that were not registered on January 1, 2010 inside the exclusion even though they advise certain long-standing employee investors, family-controlled companies, or a registered adviser that co-invests with them (capped at 5 percent of the assets the office advises). Those grandfathered offices are still treated as investment advisers for the anti-fraud paragraphs (1), (2) and (4) of Section 206.

What the exclusion buys is privacy and no paperwork. In its 2020 accredited investor release the SEC quoted its own 2010 proposal: “We viewed the typical single family office as not the sort of arrangement that Congress designed the Advisers Act to regulate.” The flip side (our reading): a family office's clients do not get the protections of the Advisers Act, and disputes are left to the family and state courts, which is the premise the SEC described in the 2011 release.

Who counts as a family client

Paragraph (d)(4) lists eleven kinds of family client. The first is the family itself, and paragraph (d)(6) defines “family member” as “all lineal descendants (including by adoption, stepchildren, foster children, and individuals that were a minor when another family member became a legal guardian of that individual) of a common ancestor (who may be living or deceased), and such lineal descendants' spouses or spousal equivalents”, provided the ancestor “is no more than 10 generations removed from the youngest generation of family members”.

Source: 17 CFR 275.202(a)(11)(G)-1(d)(4), (d)(6) and (d)(7). Paraphrased by paragraph; the CSV carries the operative words.

Three things the list does not include, by our reading: a friend of the family, a business partner of the founder who is not an employee of the office, and an in-law's own relatives who descend from a different ancestor. A spousal equivalent is defined in (d)(9) as “a cohabitant occupying a relationship generally equivalent to that of a spouse”.

Key employees: the one non-family door

Family offices hire professionals, and the rule lets those professionals invest alongside the family without breaking condition 1. Paragraph (d)(8) defines a key employee as an “executive officer, director, trustee, general partner, or person serving in a similar capacity” of the office, or an employee, “other than an employee performing solely clerical, secretarial, or administrative functions”, who “participates in the investment activities of the family office”, provided the person has done that work for the office or a similar company “for at least 12 months”. A key employee's spouse who holds a joint or community property interest with the employee is included.

The exit rule matters for staff (paragraph (d)(4)(iv)): once a key employee leaves, the office may keep advising only on assets it advised “immediately prior to the end of such individual's employment”, plus investments the person was already “contractually obligated to make”. A new investment for a departed chief investment officer would make that person an ordinary client and, by our reading, put the whole office outside the exclusion.

Why a multi-family office is not exempt

The SEC considered and refused a carve-out for offices that serve several families. In Release IA-3220, section II.A.4, it wrote: “The exclusion we are adopting today does not extend to family offices serving multiple families”. Its reason was that it could not distinguish such offices “in any meaningful way” from “family-owned commercial advisory firms that offer their services to other families”, and that a family using an office set up by another family could face conflicts of interest. Footnote 114 closes the obvious workaround: if unrelated families set up separate family offices but staff them with “the same or substantially the same employees”, those employees are managing “a de facto multifamily office” and the offices “may not claim the family office exclusion”.

So a multi-family office is, in law, an investment adviser. Form ADV Part 1A Item 2.A tells it where to register: an adviser with $100 million or more of regulatory assets under management is a large advisory firm that registers with the SEC (one already registered may stay at $90 million or more at its annual update); smaller advisers generally register with their state. Some rely on other exemptions, for example as an exempt reporting adviser to private funds. We did not source state rules; check your state securities regulator.

The four labels side by side

Source: 17 CFR 275.202(a)(11)(G)-1; SEC Release IA-3220 (2011); 15 U.S.C. 80b-2(a)(11)(A); 17 CFR 230.501(a); SEC Release 33-10824 (2020); Form ADV Part 1A Item 2.A; SEC Form ADV data file of October 2, 2026 for BMO Family Office, LLC (CRD 110264). “Who typically uses it” for multi-family offices is our reading.

The word “family office” itself carries no legal weight for a registered firm. Form ADV Part 1A Item 5.D asks advisers to sort clients into 14 types, from (a) individuals to (n) other, and none is “family office” (our count of the blank form). A wealth manager can call itself a family office, a multi-family office or a family wealth firm; what it is in law is on its Form ADV.

Census: who calls itself a family office on Form ADV

We read the SEC's Form ADV data files posted October 2, 2026: 17,210 SEC-registered advisers (latest filing in the file October 1, 2026) and 6,778 exempt reporting advisers. A true single family office should not appear in either file, because it is not an adviser. Every firm we found is therefore a registered adviser using the words, most often a multi-family office (our reading). The script and its full output are saved with this page.

Source: SEC, Information About Registered Investment Advisers and Exempt Reporting Advisers, file ia100226.zip (CSV named ia09012026.csv) posted October 2, 2026; Items 5.D, 5.E, 5.F(2)(c) and 7.B. Name match on primary business name or legal name; counts, sums and medians are ours.

The ten largest by regulatory assets:

Source: SEC Form ADV data file posted October 2, 2026, Items 5.D(b)(1) and 5.F(2)(c). Pathstone matched on its legal name. Figures rounded; exact values in the CSV.

What the census says, in four lines:

• Concentrated at the top. Pathstone's $110.3 billion is 49.0% of the group; the other 75 advisers hold $114.9 billion together (our arithmetic). By size: 7 under $100 million, 28 from $100 million to $500 million, 16 from $500 million to $1 billion, 18 from $1 billion to $5 billion, 7 at $5 billion and up.
• Richer clients than the average adviser. $23.4 million of assets per high-net-worth client against $1.9 million across all registered advisers, about 12 times as much (our arithmetic). BT Family Office reports 10 such clients for $4.0 billion.
• Paid like wealth managers, not like funds. 73 of the 76 charge a percentage of assets; 14 report performance fees and 16 advise a private fund.
• The label is wider than the name. 70 registered advisers list “family office” as an “other” client type in Item 5.D(n), and 116 list family office services among other advisory services in Item 5.G(12). Counting names and those free-text answers together, 242 advisers use the term. Among the client-type mentions are institutional managers such as Hamilton Lane and Cliffwater, for which family offices are customers. Another 32 advisers use “family wealth” instead, and 6 exempt reporting advisers carry “family office” in their name. None of the 17,210 registered advisers uses “multi-family office” in its name.

How many family offices exist? The SEC does not know either

Because a qualifying family office files nothing, no official count exists. The SEC has twice cited outside estimates:

Source: SEC Release IA-3220 (2011), pages 39-40 and footnote 126; SEC Release 33-10824 (2020), economic analysis and footnotes 336-338.

The 2011 release also put a price on the alternative: without the rule, a family office would have paid legal fees of “$200,000 on average” for an individual SEC exemptive order, so the rule's benefit was “$200 million to $1 billion” across 1,000 to 5,000 offices. One commenter estimated $25,000 to $35,000 just for a law or consulting firm to check whether an office qualifies.

Family offices as investors: Rule 501(a)(12) and what Form D cannot show

Since December 8, 2020 (Release 33-10824, 85 FR 64277), Regulation D names family offices as accredited investors. Rule 501(a)(12) covers any family office as defined in the family office rule “With assets under management in excess of $5,000,000”, “That is not formed for the specific purpose of acquiring the securities offered”, and whose investment is directed by a person with enough “knowledge and experience in financial and business matters” to evaluate it. Rule 501(a)(13) adds any family client of such an office “whose prospective investment in the issuer is directed by such family office”. The SEC's footnote 197 is explicit that the amendments “do not apply to multi-family offices”.

Two consequences, by our reading. A family client can be accredited through the office even without meeting the $1,000,000 net worth test of Rule 501(a)(5), but only for investments the office directs. And a multi-family office's clients have to qualify on their own, or through the adviser route.

We looked for family offices in Form D data and found the limit of the data. Form D Item 14 asks only how many non-accredited investors bought and how many investors in total; it never records which accredited investor category a buyer used, so the 501(a)(12) route is invisible. What can be counted is filings that mention a family office anywhere, usually as an issuer's name or a related person's address:

Source: EDGAR full-text search for the phrase “family office” in forms D and D/A, run October 11, 2026 (script and output saved). Total Form D and D/A filings in 2025, from the EDGAR form indexes: 35,141 and 22,177.

The 42 filings of 2025 are about 0.07% of the 57,318 Form D and D/A filings that year (our arithmetic). From January 2021 to September 2026 only 8 issuers with “family office” in their EDGAR name filed a Form D or D/A, 19 filings in all, mostly funds such as QVT Family Office Onshore LP. Family offices buy private placements; they rarely raise money under their own name.

Beneficial ownership and AML: where the Treasury rules stand

Two Treasury rules are often mentioned in family office marketing. Their status, from the Federal Register:

Source: Federal Register documents 2025-05199, 2026-16576, 2024-19260, 2025-24184 and 2026-20474, saved October 11, 2026.

On the AML rule, FinCEN explained in 2024 that family offices “cannot have advisory clients outside of family members” and certain other family clients, and that “This makes it easier to ascertain the source of funds for such customers”. A multi-family office that is a registered adviser falls inside the rule from January 1, 2028 (our reading). The beneficial ownership exemption covers domestic companies; foreign reporting companies still report, minus their US owners.

Verdict: which structure fits which family

• One family, one office, nobody else. The family office rule fits if all three conditions hold every day: only family clients, wholly family owned and controlled, no marketing. The SEC's 2020 description is families with “at least $100 million or more of investable assets”; the rule itself sets no minimum. No SEC filing follows, and the family loses the Advisers Act's protections in exchange (our reading).
• A family with tens of millions and no wish to employ staff. The usual alternative is a multi-family office or another registered adviser, which is regulated under the Advisers Act and has a public Form ADV. In our census the 76 firms using the name have a median of $567.5 million under management and report $23.4 million per high-net-worth client.
• An office that already advises one outsider. It is not a family office under the rule, whatever it calls itself. Unless another exemption applies, it is an adviser that should be registered (our reading of Rule 202(a)(11)(G)-1(b)(1) and Section 203).
• A family investing through its office. With more than $5,000,000 under management and a sophisticated person directing the deal, the office is accredited under Rule 501(a)(12), and family clients can invest under 501(a)(13) when the office directs them.

What a family or its adviser can do with this

• Test the office against the rule, line by line. List every person and entity the office advises and match each to one of the 11 family client categories. One unmatched client is enough to lose the exclusion.
• Check the key employees' dates. Each staff member who invests with the family needs 12 months in investment activities, and a departing one can keep only existing assets with the office.
• Read a multi-family office's Form ADV before signing. Item 5.E shows how it is paid, Item 5.D what clients it serves, and Part 2 the brochure. Our census lists the 76 advisers using the name in the CSV.
• Know the investor tests. For the accredited, qualified client and qualified purchaser lines, see qualified purchaser vs accredited investor and the qualified client definition under Rule 205-3, where an open SEC proposal would fold accredited investors in. For what an adviser's legal duty is, see our guide to fiduciary financial advisors; for private markets an office may buy, how to invest in private equity.

This is analysis of public documents, not investment, legal or tax advice.

FAQ

Sources, read and saved on October 11, 2026: 17 CFR 275.202(a)(11)(G)-1, 230.501 and 275.205-3 from the eCFR (current to October 8, 2026); 15 U.S.C. 80b-2 (U.S. Code 2023 edition, govinfo.gov); SEC Release IA-3220, Family Offices (June 22, 2011); SEC Release 33-10824, Accredited Investor Definition (2020); SEC Form ADV Part 1A and Form D (blank forms); SEC Form ADV data files for registered and exempt reporting advisers posted October 2, 2026; EDGAR full-text search and EDGAR full-index form files for 2021 to 2026; Federal Register documents 2025-05199, 2026-16576, 2024-19260, 2025-24184 and 2026-20474. Counts, sums, medians and percentages are our arithmetic; the scripts are saved with this page. This is analysis of public documents, not investment, legal or tax advice.