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A family office is a private wealth management firm established to serve the financial and administrative needs of one or more ultra-high-net-worth families. It centralizes investment management, tax planning, estate planning, accounting, legal coordination, philanthropic administration, and often concierge services under one roof. A single-family office serves one family exclusively. A multi-family office shares its infrastructure and staff across several wealthy families, reducing per-family costs while maintaining a high level of personalized service.
Most practitioners set the threshold for establishing a single-family office at $100 million to $250 million in investable assets, because the cost of running a private office, typically $1 million to $3 million annually, needs to be justified against the complexity of the assets it manages.
The scope extends well beyond investment management. A fully staffed family office functions as the equivalent of a CFO, chief investment officer, estate attorney, accountant, and chief of staff all working together on one family's behalf.
| Single-Family Office | Multi-Family Office | |
|---|---|---|
| Clients Served | One family exclusively | Multiple families; typically 10 to 50+ |
| Annual Cost | $1 million to $5 million+ depending on scope and staff | Shared; families pay fees proportional to assets or services used |
| Customization | Maximum; all resources dedicated to one family's needs | High but not exclusive; some standardization for efficiency |
| Privacy | Maximum; no information shared outside the family | Strong but by nature shared infrastructure with other clients |
| Minimum Asset Level | $100 million to $250 million typically | $25 million to $50 million typically |
Single-family offices in the United States are explicitly exempt from registration as investment advisers under the Investment Advisers Act of 1940. The Dodd-Frank Act codified this exemption in 2010 under SEC Rule 202(a)(11)(G)-1, which defines a family office as one that manages assets exclusively for family clients, is wholly owned and controlled by family members, and does not hold itself out to the public as an investment adviser.
Multi-family offices are typically registered with the SEC as investment advisers because they manage assets for clients outside a single family, which disqualifies them from the family office exemption.
According to research from Campden Wealth, the number of family offices globally surpassed 10,000 by 2024, with the United States holding the largest concentration. The recent generational transfer of wealth from baby boomers to younger generations and the growth of first-generation wealth from technology and private equity exits have both accelerated family office formation. Many of the largest private equity and venture capital founders now operate family offices to manage the significant liquidity events they create.
With deep roots in traditional finance and the digital asset industry, Acquire.Fi operates as a specialist M&A advisory firm. Coverage spans M&A, secondaries, OTC, and capital markets advisory across digital assets and frontier tech. Our team has decades of combined experience across every stage of the deal lifecycle.
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