Family Office: How the Very Rich Organize Their Lives and Money

The Million Dollar Question: Roughly how many single-family offices were operating worldwide in 2024, according to Deloitte’s Family Office Landscape census?

A) ~2,000 B) ~5,000 C) ~8,000 D) ~15,000

Read on for the answer.

A family office is a private company whose only client is the family that owns it. The popular picture — a hushed boardroom on Park Avenue, a quiet manager moving billions — is partly right and mostly incomplete. Most family offices are also doing payroll for the chef, filing the kids’ taxes, coordinating the pilots, vetting the IT vendor, sitting in on prenup negotiations, and running the cap table of the founder’s next side bet. Once a fortune crosses roughly $100–250 million, the integration of all that work under one roof becomes more economical than buying it from outside vendors, and a recognizable structure takes over. Thousands of the world’s wealthiest families now operate one.

What it is

A family office is a private company that exists to serve one family — the single-family office, or SFO — or a small group of unrelated families that share staff and infrastructure, the multi-family office, or MFO. It is not a fund. It does not pool outside money. It is not a bank. It is the family’s own back office, consolidating investment management, tax and legal coordination, household administration, philanthropy, and concierge functions under one reporting line that answers only to the family.

The structure exists in part because, at a certain size, a fortune generates more work than any vendor can absorb. It also exists, in the United States, because of a specific regulatory carve-out. Under the SEC’s 2011 Family Office Rule, implementing Section 409 of the Dodd-Frank Act, a properly-structured single-family office is excluded from the Investment Advisers Act of 1940 — meaning it does not have to register with the SEC, file disclosures, or be examined as an investment adviser, provided its only clients are family members and a narrow class of related entities. That carve-out is what makes the modern single-family form viable at scale.

The size of the universe is large enough to be its own institutional category. Deloitte’s Defining the Family Office Landscape census counted about 8,030 single-family offices worldwide in 2024, up from roughly 6,130 in 2019, and projected the count to reach roughly 9,030 by 2025 and 10,720 by 2030. Total assets managed by those offices are projected to climb from about $3.1 trillion today to $5.4 trillion by 2030.

Who uses it

Wealth bands sort cleanly along the family-office spectrum.

Families in the $30M–$100M band typically use a multi-family office or a private-bank private-client division rather than a dedicated SFO. Most MFO platforms expect a minimum client net worth of around $25 million, though some modular providers go as low as $10 million.

Families in the $100M–$1B band are the heart of single-family-office land. Practitioner rule of thumb: a real SFO running investments, tax, legal, household, and philanthropy needs $1–3 million a year just to staff and house, which is why most experts put the practical floor for a dedicated SFO at $100–250 million in family net worth.

Families in the $1B+ band run institutional-scale SFOs that look more like small investment firms — a CIO, deputy CIOs, in-house counsel, a CFO, a controller, a tax director, and a head of household.

At the top of the league table, three American family offices dominate the public imagination. Walton Enterprises, the office that holds the Walton family’s roughly half of Walmart’s outstanding shares, manages assets estimated at around $225 billion, making it the largest family office in the world. Cascade Investment, run since 1994 by Michael Larson, oversees a portfolio for Bill Gates that Bloomberg has valued at about $170 billion, spanning equities, bonds, real estate, and direct holdings. Bezos Expeditions, Jeff Bezos’s office, manages a fortune anchored in Amazon stock and was the second-most-active US family office for direct dealmaking on CNBC’s inaugural 2025 Inside Wealth Family Office 15 list.

Regionally, Deloitte’s count places about 3,180 SFOs in North America, 2,290 in Asia-Pacific, 2,020 in Europe, 290 in the Middle East, 190 in South America, and 60 in Africa. The popular association of family offices with American tech wealth understates how international the structure has become.

Why they use it

Four motivations drive families across the $100M threshold to stand up a dedicated office.

The first is concentration. A single fortune above $100 million produces more legal, tax, and reporting work than a typical wealth manager can absorb without it becoming the entire client relationship. A family with a closely-held operating business, a real-estate portfolio, a slate of trust entities, a foundation, and a venture portfolio is running what amounts to a small holding company. Someone has to consolidate it.

The second is confidentiality. An employee bound by an employment contract is more controllable than a vendor with twenty other clients. Sensitive material — net-worth statements, prenup terms, health information, succession plans — sits with people whose careers depend on the family.

The third is coordination. The investment side, the tax side, the household side, the philanthropy side, and the next-generation education side all touch each other constantly. A trust that funds a foundation that owns part of an operating business that employs a child of the founder is not three problems; it is one problem with three faces. The family office is the layer that integrates them.

The fourth is continuity. Wealth managers change firms. Lawyers retire. Bankers get reorganized. A family office can outlive the founder, the original CIO, and the original counsel — it becomes the institutional memory of the fortune. The UBS Global Family Office Report 2025, surveying 317 of its largest family-office clients with an average AUM of $1.1 billion and an average family net worth of $2.7 billion, reports a list of motives that hews almost exactly to these four.

How it works

The legal shell is usually an LLC or a corporation owned by the family or by a family trust. The headcount is small relative to the assets involved — a typical SFO with $1 billion under management might run on fifteen or twenty employees.

Staffing follows a recognizable pattern. According to UBS, the first hire in a new SFO is almost always an investment portfolio manager; a CEO and a CFO follow. Within the “pure office” cost stack — the cost of running the family office itself, before investment fees — staff represents about 67% of total expenses, with legal and compliance at 19%, physical infrastructure 8%, IT 7%, and research 5%.

Services span six recognizable buckets:

• Investment management. In-house portfolio construction, external manager selection, manager monitoring. At larger offices, direct investments — buying operating businesses outright, leading or co-leading private-equity rounds, anchoring venture funds — become a significant share. Two-thirds of family offices now pursue direct private-equity investments, and direct allocations account for more than 40% of the typical family-office private-equity sleeve.

• Tax. Preparation of personal, trust, partnership, and entity returns; multi-state and multi-country residency planning; structuring of gifts and bequests.

• Legal. Entity formation and maintenance, trust administration, prenup and divorce coordination, philanthropy compliance, document custody.

• Accounting. Consolidated balance-sheet reporting across what can run to hundreds of entities, with monthly or quarterly statements that roll up to a family-level view.

• Household and concierge. Payroll, benefits, and HR for nannies, chefs, drivers, pilots, and security; property management for primary and secondary homes; travel and aircraft coordination. The family office is, in effect, the employer of record for the household staff covered in #20 Staff: Outsourcing Daily Life.

• Philanthropy and family governance. Foundation administration, grantmaking, board support, next-generation education programming, family-meeting facilitation.

Asset allocation across family-office portfolios has tilted strongly toward private markets. UBS’s 2025 report shows the average global family-office portfolio at roughly 30% public equities, 18% fixed income, 8% cash, 21% private equity, 11% real estate, 4% private debt, 4% hedge funds, and the balance in infrastructure, gold, and art. In the United States, alternatives are even more dominant, with private equity alone running closer to 27% of the typical office’s assets.

What it costs

The headline operating-cost figure from UBS’s 2025 survey is 0.353% to 0.44% of assets under management, or roughly $3.5–$4.4 million per $1 billion managed. The number sounds small until you translate it into staff and offices.

Costs vary cleanly by size and generation. By AUM band, UBS reports averages of:

• $100M–$250M AUM: about 0.418% in operating costs, or roughly $400K–$1M a year.
• $250M–$1B AUM: about 0.424%, or roughly $1M–$4M a year.
• $1B+ AUM: about 0.353% — the scale advantage kicks in.

By generation, first-generation offices average 0.368%, while second- through seventh-generation offices average 0.44% — older offices carry more services, more entities, more legacy overhead, and more family members to support.

The total cost stack runs deeper than the pure-office line. UBS reports that on top of the 57% share that is the “pure family-office cost,” asset-management fees paid to external managers account for about 21% of total spend, banking-related fees about 10%, external legal and structuring 8%, and other items 4%.

Below the SFO threshold, the right structure is usually a multi-family office. MFOs charge a fraction of an SFO’s cost by spreading staff across multiple client families. NerdWallet’s family-office explainer puts a working SFO’s annual run rate at roughly $1–2 million minimum — which is the arithmetic behind the $100–250 million floor most practitioners cite.

Hidden costs and tradeoffs

Five real costs come with the structure, none of which appear on the operating-cost line.

The first is concentration risk in key personnel. The CIO, CFO, and CEO of a family office often hold extraordinary discretionary authority over the family’s affairs. Getting one of those hires wrong is expensive, and the canonical cautionary tale is Bernie Madoff, whose victims included multiple family offices that had outsourced too much trust to one person.

The second is compensation pressure at the top of the org chart. SFO investment talent has to compete with hedge funds and private equity. A first-class CIO at a $1B+ office typically costs $500K–$2M a year all-in, and the headhunter market for those seats is permanently active. Family offices that under-pay turn over CIOs every few years; family offices that over-pay can find themselves running an internal hedge fund whose costs are no longer commensurate with the family’s actual investment needs.

The third is family politics inside a company. Siblings serving on the same SFO board is the most common source of family-office dysfunction, and succession — the founder hands off control to the next generation — is the second. Many SFOs end up reorganized along family-branch lines simply because the original combined entity becomes ungovernable.

The fourth is reporting and consolidation drag. A first-generation office may run on Excel. By the second generation, with hundreds of trust, partnership, and operating-company entities to roll up, the office needs an enterprise-grade general-ledger and consolidated-reporting platform — Addepar, Asset Vantage, Masttro, and similar — plus the IT staff to run it. The system bill alone can run six figures a year.

The fifth is cybersecurity and physical-security exposure. A family office is a single, high-value target. Wire-fraud attempts, business-email compromise, and social engineering against household staff are routine — see #31 Cybersecurity: Digital Protection for High-Net-Worth Lives and #13 Personal Security: Protection, Privacy, and Risk. The bigger the office, the bigger the attack surface, and the more it has to spend on those defenses.

What people get wrong

Five corrections do most of the work.

A family office is not an investment fund. It does not raise outside capital. It does not have limited partners. It is the family’s own company — closer in spirit to a holding-company headquarters than to a hedge fund. The confusion is partly the fault of cases like Soros Fund Management, which converted from a hedge fund to a family office in 2011 by returning less than $1 billion of external money to avoid SEC registration under Dodd-Frank — but the conversion is what made it a family office, not what made it look like one.

Single-family and multi-family offices are not the same thing. An MFO serves multiple unrelated families on a shared-cost model and is usually a registered investment adviser. An SFO serves one family and typically qualifies for the SEC’s family-office exclusion. The economics, governance, and confidentiality posture of the two structures are different enough that the choice between them is the first real decision a family in this band has to make.

Most SFOs are not new-money tech offices. Deloitte’s census shows that industrial, retail, energy, and real-estate fortunes still dominate the count; tech is the most visible cluster, not the largest. The Walton family’s office is bigger than every Silicon Valley SFO combined.

“$100 million minimum” is a rule of thumb, not a law. Some sub-$100M families set up SFOs anyway because they hate vendor fragmentation more than they hate the higher per-dollar cost. Some $500M+ families happily stay with an MFO or a private bank because they don’t want the staffing complexity. The right structure depends as much on how the family wants to live with the wealth as on the size of the wealth itself.

The biggest job is not investing; it is administration. Consolidated reporting across the family’s investment accounts, operating businesses, real estate, trusts, foundations, partnerships, and household payroll is the function the family actually needs, and the one most outside vendors do poorly. The reason the SFO structure persists is not that families think they can pick stocks better than Goldman; it is that no outside vendor will tell them, on a single screen, what they own.

Bottom line

The Million Dollar Question: Deloitte’s 2024 census counted about 8,030 single-family offices worldwide, up from roughly 6,130 in 2019 and projected to reach about 9,030 by 2025 and 10,720 by 2030 — the answer is C.

The deeper story is structural. At the very top of the wealth distribution, individual fortunes are no longer “managed” in any ordinary sense. They are administered, by full-time employees who report to a board the family controls. The family office is the structure that turns a fortune from an individual problem into an institutional one — owned by the family, staffed by professionals, designed to outlive whoever made the money. By the time a real SFO exists, what is being managed is not the wealth so much as the life around it.

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Related reading: Money Management: From Wealth Manager to Family Office · Wealth Levels: Life at $1M, $10M, $100M, and $1B · Staff: Outsourcing Daily Life · Billionaire Rankings: How Extreme Wealth Is Counted · Borrowing Against Wealth: Why the Rich Often Use Debt