What it means
Family offices exist because very large fortunes create work that no single adviser covers. Once a family holds operating businesses, property, private investments, trusts and charitable commitments across several countries, coordinating everything becomes a full-time job for a small team.
There are two broad models. A single family office serves one family and is wholly controlled by them, while a multi-family office serves perhaps ten to a hundred families and spreads its costs across all of them, in exchange for less bespoke service.
The appeal of the single family office is control, privacy and alignment. Staff are employed by the family, there is no incentive to sell in-house products, and confidential matters such as succession plans never leave the building.
The catch is fixed cost. A credible team needs a chief investment officer, an accountant, legal support, technology and audited controls, which rarely comes in under a few million dollars a year, so the model only works above a large asset base.
Family offices are increasingly visible in deal markets because they can act quickly and hold assets for decades rather than for a fund's ten-year life. Founders selling a business often prefer that patient money to a private equity buyer with a fixed exit timetable.
In practice
Real-world examples.
Example
A family that sold a logistics business for $340,000,000 sets up an office with four staff to manage the proceeds. The team runs a portfolio of listed shares, bonds and three direct property holdings, and administers the family's charitable trust.
Example
A third-generation manufacturing family uses its office mainly for governance rather than investing. The office runs the family council, maintains the shareholder register across nineteen cousins, and coordinates the annual valuation used for internal share transfers.
Example
A multi-family office in a regional city serves twenty-two families with a combined $2,100,000,000. It charges a percentage of assets, provides consolidated reporting across every custodian each family uses, and buys tax and legal advice in bulk on their behalf.
Formula
Calculation
Running cost ratio = annual operating cost of the family office / assets under management
The Aldergrove family holds $500,000,000 of investable assets and runs a single family office costing $4,000,000 a year in salaries, technology, premises and professional fees.
Cost ratio: $4,000,000 / $500,000,000 = 0.8%
If the family instead used a multi-family office charging 1.1% of assets, the annual bill would be 1.1% x $500,000,000 = $5,500,000, so the in-house route saves $5,500,000 - $4,000,000 = $1,500,000 a year.
The arithmetic reverses at smaller scale. On $200,000,000 of assets the same $4,000,000 of fixed cost equals $4,000,000 / $200,000,000 = 2.0%, which is far more than the outsourced alternative would charge. This is why single family offices cluster among the very largest fortunes and everyone else shares the overhead.Case study
Seen in the real world.
This is an illustrative, fictional scenario. The Marchetti family sold their packaging group for $410,000,000 and, within a year, had accounts at six banks, four investment managers and two brokers, with no single report showing what they actually owned.
They established the Marchetti Office with a chief investment officer, a financial controller and an administrator, at a running cost of $2,400,000 a year, or 0.59% of assets. The first task was not investing but consolidation: one reporting system, one set of investment guidelines, and a written policy on how much could sit in any single holding.
Two years later the measurable win was not a clever trade. It was the discovery that overlapping mandates had left the family holding the same twelve shares through three different managers, and that trimming the duplication cut manager fees by roughly $900,000 a year while reducing concentration risk.
Watch out
Common mistakes.
- Assuming a family office is only about investing. Tax compliance, reporting, governance, succession and philanthropy usually take up more of the team's time than portfolio decisions do.
- Setting one up at too small a scale. Below roughly $200,000,000 the fixed overhead typically costs more than a good outsourced arrangement would.
- Skipping formal governance because it is family. Without a written investment policy and clear decision rights, disagreements between generations tend to surface only when a large decision is already urgent.
Questions
People also ask.
What is the difference between a single and a multi-family office?
A single family office serves one family and is paid for entirely by them, while a multi-family office spreads its costs and its attention across many client families.
Do family offices have to be regulated?
It depends on the jurisdiction and the activities undertaken, but offices advising only their own family often qualify for exemptions that would not apply to a firm serving outside clients.
Why do sellers of businesses like family office buyers?
Family offices generally invest their own money with no fixed exit date, so they can offer longer holding periods and less pressure to refinance or resell quickly.
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