Top 10 US Family Offices Managing Ultra-High Net Worth

Bezos Expeditions is the personal investment vehicle of Amazon founder Jeff Bezos, managing a portfolio valued at $170 billion+ that spans 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, Bezos Expeditions committed $1 billion to climate tech and ocean conservation through the Bezos Earth Fund.

Bezos Expeditions

Cascade Investment LLC is Bill Gates's family office, managing over $100 billion in assets with a distinctly non-tech portfolio including major stakes in CNH Industrial, Waste Management, Canadian National Railway, and Four Seasons Hotels. Cascade is one of the largest private farmland owners in the US, with over 269,000 acres across 18 states. The office also manages Gates's $20 billion personal foundation endowment contributions.

Cascade Investment (Bill Gates)

Koch Industries, the second-largest private company in America with $120 billion+ in revenues, operates as an effective family office for Charles and David Koch's descendants, spanning refining, chemicals, consumer brands (Georgia-Pacific, Brawny), and financial services. The family has deployed over $3 billion into political and policy advocacy infrastructure since 2000. In 2025-2026, Koch's family office expanded into renewable energy investments to diversify beyond fossil fuel assets.

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

Bezos Expeditions is the personal investment vehicle of Amazon founder Jeff Bezos, managing a portfolio valued at $170 billion+ that spans 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, Bezos Expeditions committed $1 billion to climate tech and ocean conservation through the Bezos Earth Fund.

Bezos Expeditions

Cascade Investment LLC is Bill Gates's family office, managing over $100 billion in assets with a distinctly non-tech portfolio including major stakes in CNH Industrial, Waste Management, Canadian National Railway, and Four Seasons Hotels. Cascade is one of the largest private farmland owners in the US, with over 269,000 acres across 18 states. The office also manages Gates's $20 billion personal foundation endowment contributions.

Cascade Investment (Bill Gates)

Koch Industries, the second-largest private company in America with $120 billion+ in revenues, operates as an effective family office for Charles and David Koch's descendants, spanning refining, chemicals, consumer brands (Georgia-Pacific, Brawny), and financial services. The family has deployed over $3 billion into political and policy advocacy infrastructure since 2000. In 2025-2026, Koch's family office expanded into renewable energy investments to diversify beyond fossil fuel assets.

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