---
title: "Multi-Family Office (MFO) | Altss Glossary"
description: "A multi-family office (MFO) is a firm that provides investment management and family-office services to several unrelated families, either allocating…"
canonical: "https://altss.com/glossary/multi-family-office"
---

Glossary · Allocator type

# Multi-Family Office (MFO)

Also called: multi family office

A multi-family office (MFO) is a firm that provides investment management and family-office services to several unrelated families, either allocating their capital with discretion or advising families who decide for themselves.

Publisher: Altss LLC Published 2025-12-24 Content modified 2026-10-02

ALTSS-ALLOC-021

An MFO spreads the cost of a family office across many families. Some began as one family's office and took on others; others are independent advisory firms or units of banks and trust companies. Because its clients are not one family, a US MFO generally cannot use the family office exclusion and is regulated as an investment adviser unless an exemption applies.

## Origins and business models

Three origins are common. A **private MFO** grows out of a [single-family office](https://altss.com/glossary/single-family-office) (SFO) that opened to other families, often keeping the founding family as the largest client. An **independent MFO** is an advisory firm built to serve wealthy families from the start. An **institution-owned MFO** is a unit of a bank, trust company or wealth manager, which brings it close to [private banking and wealth management](https://altss.com/glossary/private-bank-wealth-management).

Services usually extend beyond investing: consolidated reporting across entities, tax and estate coordination, trust administration, philanthropy and household administration; the operating models are set out under [family office](https://altss.com/glossary/family-office). Fees are typically asset-based, fixed retainers, or a mix.

## Jurisdiction and status (US)

The SEC [Family Office Rule](https://altss.com/glossary/family-office-rule) excludes an office only if all its clients are family clients (apart from a narrow grandfathering provision for certain advice relationships that began before 1 January 2010): members and former members of one family, key employees, and certain trusts, estates, charities and companies of those clients. Clients from unrelated families are not family clients, so an MFO generally cannot rely on the rule. If it advises on securities as a business for compensation it is an investment adviser (Advisers Act section 202(a)(11)), and it registers with the SEC under section 203 or with its home state, depending mainly on its regulatory assets under management (section 203A), unless an exemption applies; see [registered investment adviser](https://altss.com/glossary/registered-investment-advisor).

Registration has visible consequences. A registered MFO files [Form ADV](https://altss.com/glossary/form-adv), whose filings are searchable through the SEC's Investment Adviser Public Disclosure (IAPD) site. It owes its clients a federal fiduciary duty of care and loyalty, and, if it is registered or required to be registered with the SEC, its advertisements, including to investors in private funds it advises, fall under the SEC Marketing Rule. Since the 2020 amendments, SEC- and state-registered advisers are themselves accredited investors under Regulation D (Rule 501(a)(1)).

## Discretionary and advisory mandates

Who decides is the most useful fact about an MFO, and it can differ by client.

- **Discretionary.** The MFO's investment committee decides and commits, often through a pooled vehicle it sponsors (a feeder fund or a fund-of-funds style programme) or through [separately managed accounts](https://altss.com/glossary/separately-managed-account). The MFO, or its vehicle, signs the subscription documents.
- **Advisory.** The MFO researches and recommends; each family decides and invests through its own entities. An MFO's approved list is then a shortlist, not a commitment.
- **Hybrid.** The MFO selects a manager and offers the opportunity to families, who opt in; the commitment equals the sum of opt-ins.

For a fund manager this decides who runs diligence, who must be eligible (each family, or the MFO vehicle), and whose relationship the commitment represents.

## Not the same as

- [Single-Family Office (SFO)](https://altss.com/glossary/single-family-office): An SFO serves one family, invests its own capital and can usually rely on the SEC exclusion; an MFO serves unrelated families and is generally a registered adviser.
- [Private Bank and Wealth Manager](https://altss.com/glossary/private-bank-wealth-management): A private bank or wealth manager serves a broad client base from a product platform; MFOs serve fewer, larger families with family-office services, though bank-owned MFOs blur the line.
- [Outsourced Chief Investment Officer (OCIO)](https://altss.com/glossary/ocio): An outsourced chief investment officer (OCIO) runs an institution's portfolio with delegated discretion; an MFO serves families and adds non-investment services, though some MFOs act as OCIO for their clients' foundations.

## How it is classified

- Record both Allocator Type and Intermediary facets; mark the mandate (discretionary, advisory, hybrid) per relationship where evidence allows.
- When the MFO's pooled vehicle is the LP of record, record the vehicle as LP and relate it to the MFO; record client families separately and only where disclosed.
- Use Form ADV and IAPD records as the primary evidence of registration, assets under management and services.

## Common mistakes

- Assuming an MFO can rely on the SEC Family Office Rule. Clients from unrelated families are not family clients.
- Treating an MFO contact's interest as a commitment when the MFO is advisory-only. Each family decides.
- Counting an MFO's total client assets as capital it can allocate to private markets.
- Merging the MFO with the families it serves, or with its parent bank.

## Edge cases

- An office serving several branches of one extended family may still be a single-family office if every client descends from a common ancestor within the rule's 10-generation limit.
- An MFO may be discretionary for some clients and advisory for others in the same fund.
- A private MFO that still answers mainly to its founding family behaves more like an SFO for that family's capital.

## Questions

### Is a multi-family office a registered investment adviser?

In the US it generally is. Serving unrelated families takes it outside the SEC Family Office Rule, so if it advises on securities as a business for compensation it must register with the SEC or its home state unless an exemption applies.

### When an MFO likes a fund, who actually commits?

It depends on the mandate. A discretionary MFO commits for its clients, often through its own vehicle; an advisory MFO recommends and each family decides and signs separately.

## Sources

1. [17 CFR 275.202(a)(11)(G)-1 - Family offices](https://www.law.cornell.edu/cfr/text/17/275.202(a)(11)(G)-1). U.S. Securities and Exchange Commission (CFR text via eCFR; LII mirror), eCFR current as of 2026-09-29; adopted 2011 (76 FR 37994), amended 2016 (81 FR 60457). Status: in force (checked 2026-10-01). 17 CFR 275.202(a)(11)(G)-1(b)(1), (d)(4), (d)(6), (d)(7) — supports: Exclusion limited to family clients; unrelated families fall outside
2. [15 U.S.C. 80b-3 - Registration of investment advisers (Advisers Act sec. 203, incl. 203(l) and 203(m))](https://www.law.cornell.edu/uscode/text/15/80b-3). U.S. Congress (United States Code; LII mirror), Current US Code text as published by LII (accessed 2026-10-01). Status: in force (checked 2026-10-01). Advisers Act sec. 203(a) — supports: Registration of investment advisers with the SEC, subject to exemptions
3. [Form ADV (Uniform Application for Investment Adviser Registration and Report by Exempt Reporting Advisers) - SEC form cover and index](https://www.sec.gov/about/forms/formadv.pdf). U.S. Securities and Exchange Commission, OMB No. 3235-0049; expires 2027-07-31. Status: in force (checked 2026-10-01). Form ADV cover and index (OMB 3235-0049) — supports: Form ADV filing and annual amendment by registered advisers
4. [Investment Adviser Public Disclosure (IAPD)](https://adviserinfo.sec.gov/). U.S. Securities and Exchange Commission, Live database (accessed 2026-10-01). Status: current (checked 2026-10-01). Investment Adviser Public Disclosure — supports: Public search of Form ADV filings
5. [Commission Interpretation Regarding Standard of Conduct for Investment Advisers, Release No. IA-5248](https://www.sec.gov/files/rules/interp/2019/ia-5248.pdf). U.S. Securities and Exchange Commission, Dated 2019-06-05; effective 2019-07-12 (File No. S7-07-18; 17 CFR Part 276). Status: in force (checked 2026-10-01). p. 2 (Introduction); Sec. II (pp. 6-8) — supports: Federal fiduciary duty of care and loyalty owed by investment advisers
6. [17 CFR 275.206(4)-1 - Investment adviser marketing (Marketing Rule)](https://www.law.cornell.edu/cfr/text/17/275.206(4)-1). U.S. Securities and Exchange Commission (CFR text via eCFR; LII mirror), eCFR current as of 2026-09-29; last amended 2022-04-15 (later versions technical). Status: in force (checked 2026-10-01). 17 CFR 275.206(4)-1 introductory text; (e)(1) — supports: Rule applies to advisers registered or required to be registered under Advisers Act section 203; advertisement definition covers communications to private fund investors
7. [Accredited Investor Definition (final rule), Release No. 33-10824](https://www.sec.gov/rules/2020/08/accredited-investor-definition). U.S. Securities and Exchange Commission, Adopted 2020-08-26; 85 FR 64234 (2020-10-09); effective 2020-12-08. Status: in force (checked 2026-10-01). Release 33-10824 — supports: SEC- and state-registered advisers added as accredited investor entities (2020)
8. [15 U.S.C. 80b-2 - Definitions (Advisers Act s.202)](https://www.law.cornell.edu/uscode/text/15/80b-2). U.S. Congress (US Code via LII), Current US Code text as published by LII (accessed 2026-10-01). Status: in force (checked 2026-10-01). Advisers Act sec. 202(a)(11) — supports: Investment adviser definition
9. [15 U.S.C. 80b-3a - State and Federal responsibilities (Advisers Act s.203A)](https://www.law.cornell.edu/uscode/text/15/80b-3a). U.S. Congress (US Code via LII), Current US Code text as published by LII (accessed 2026-10-01). Status: in force (checked 2026-10-01). Advisers Act sec. 203A(a)(1)-(2) — supports: State versus SEC registration by assets under management
10. [17 CFR 230.501 - Definitions and terms used in Regulation D (accredited investor)](https://www.law.cornell.edu/cfr/text/17/230.501). U.S. Securities and Exchange Commission (CFR text via eCFR; LII mirror), eCFR current as of 2026-09-29; last amended 2025-02-18 (technical, 90 FR 9684); last substantive amendment effective 2020-12-08 (85 FR 64234). Status: in force (checked 2026-10-01). 17 CFR 230.501(a)(1) — supports: SEC- and state-registered advisers are accredited investors

## Related terms

8 terms

- [Single-Family Office (SFO)](https://altss.com/glossary/single-family-office)
- [SEC Family Office Rule (Rule 202(a)(11)(G)-1)](https://altss.com/glossary/family-office-rule)
- [Registered Investment Adviser (RIA)](https://altss.com/glossary/registered-investment-advisor)
- [Form ADV](https://altss.com/glossary/form-adv)
- [Private Bank and Wealth Manager](https://altss.com/glossary/private-bank-wealth-management)
- [Outsourced Chief Investment Officer (OCIO)](https://altss.com/glossary/ocio)
- [Separately Managed Account (SMA)](https://altss.com/glossary/separately-managed-account)
- [Family Office](https://altss.com/glossary/family-office)

## Concept record

Concept ID

ALTSS-ALLOC-021

Classification

Allocator type · Intermediary & service provider

Topics

Family offices

Version

2.0.0

Last reviewed

2026-10-02

Structured data

[JSON](https://altss.com/reference/concepts/multi-family-office.json)

Source check

Legal statements checked against the cited primary sources on 2026-10-02 ([how](https://altss.com/methodology)). General information, not advice.

## Canonical URL

https://altss.com/glossary/multi-family-office