Top 10 US Family Offices Managing Ultra-High Net Worth

Bezos Expeditions manages a portfolio valued at $170 billion+ for Amazon founder Jeff Bezos, spanning aerospace (Blue Origin), media (Washington Post), biotech, and early-stage technology ventures. The family office has made over 100 venture investments including Airbnb, Uber, and Google. In 2025, it committed $1 billion to climate tech and ocean conservation through the Bezos Earth Fund. Its asset base is $70 billion larger than #3 Cascade Investment’s $100 billion, reflecting its aggressive diversification strategy.

Bezos Expeditions

Cascade Investment manages over $100 billion in assets for Bill Gates with a distinctly non-tech portfolio—major stakes in CNH Industrial, Waste Management, Canadian National Railway, and Four Seasons Hotels. The office is one of the largest private farmland owners in the US, holding 269,000 acres across 18 states. It also handles Gates’s $20 billion foundation endowment contributions. Its farmland holdings are 10 times larger than the average US family office’s agricultural investments, emphasizing its unique asset allocation.

Cascade Investment (Bill Gates)

Koch Industries operates as an effective family office for Charles and David Koch’s descendants, generating $120 billion+ in revenues as the second-largest private company in America. Its portfolio spans refining, chemicals, consumer brands (Georgia-Pacific, Brawny), and financial services. Since 2000, the family has deployed over $3 billion into political and policy advocacy. In 2025–2026, it expanded into renewable energy to diversify beyond fossil fuels. Koch’s $120 billion revenue is 1.2 times larger than #3 Cascade Investment’s $100 billion in managed assets, showcasing its industrial scale.

Koch Family Office

MSD Partners is the family office of Dell Technologies founder Michael Dell, managing over $25 billion in assets including real estate, public equity, private credit, and direct investments. The office manages four separate investment funds and has become a significant lender in the commercial real estate market. In 2025, MSD Partners was among the most active family offices in direct private credit deals, deploying $2.5 billion in new lending commitments.

MSD Partners (Michael Dell)

Soros Fund Management, the family office of legendary investor George Soros, manages approximately $25 billion in endowment assets for the Open Society Foundations after converting from a hedge fund in 2011. The firm pioneered macro investing strategies and is famous for "breaking the Bank of England" in 1992, netting $1 billion in a single day. By 2025, Soros had donated over $32 billion to philanthropic causes — the largest philanthropic total of any living individual at the time.

Soros Fund Management

The Mars family office manages the wealth of the Mars Inc. confectionery dynasty, with a combined family net worth estimated at $94 billion, making the Mars family one of the wealthiest in the world. Mars Inc. remains entirely private, generating over $45 billion in annual revenues from M&Ms, Snickers, Wrigley, and Pedigree pet food brands. The family office maintains a conservative, long-term investment philosophy with no debt on Mars Inc.'s balance sheet — exceptional for a company of its scale.

Mars Family Office

The Pritzker Organization manages the wealth of the Pritzker family — founders of the Hyatt hotel chain — with a combined family net worth of approximately $28 billion split among multiple family branches. The family office has diversified aggressively beyond Hyatt, with major stakes in TransUnion, Royal Caribbean, and global real estate. Tom Pritzker's branch focuses heavily on Asia-Pacific expansion, while Penny Pritzker (former US Commerce Secretary) runs her own $3 billion+ investment vehicle.

Pritzker Organization

Icahn Enterprises LP functions as the publicly traded family office of activist investor Carl Icahn, with approximately $15 billion in AUM spanning energy, automotive, pharmaceuticals, and real estate. Icahn is renowned for high-profile activist campaigns against companies including Apple, eBay, and Xerox, generating returns that made him one of the wealthiest investors in history. In 2023-2024, Icahn Enterprises weathered significant short-seller scrutiny from Hindenburg Research but retained its investment-grade positioning.

Icahn Enterprises

Rockefeller Capital Management descends from the Rockefeller family office established in 1882, now serving multi-generational ultra-high-net-worth clients beyond the founding family with $120 billion+ in AUM. The firm recently spun off from Fidelity's National Financial Partners and manages philanthropy, tax-efficient investing, and dynasty trusts for over 200 family office clients. The Rockefeller family's own philanthropic vehicles — including the Rockefeller Foundation — have deployed over $24 billion in grants since 1913.

Rockefeller Capital Management