What’s the largest UK family office by AUM?

Our familyofficehub.io team has analyzed the UK family office market to find the country’s largest family investment vehicle. We conclude that Weybourne Group, the single-family office of James Dyson, is the largest UK family office. Dyson’s net worth and the AUM of his family office are estimated to be over £11 billion ($15 billion).

How does Weybourne Group invest?

The Dyson family office, Weybourne Group, oversees a range of operating businesses, including Dyson Group and Dyson Farming, and also maintains a dedicated investment division that supports its strategic objectives as a long-term, family-owned enterprise. The group’s recent acquisition of 126–127 New Bond Street for approximately £71 million exemplifies its interest in high-quality real estate assets. The 12,900-square-foot building, currently leased to heritage brand Swaine London, reflects a focus on resilient retail locations, particularly in London’s West End. In 2023, the UK family office has also purchased an historic building in SoHo, New York for $60M, underlining the global activities of the family office. Beyond real estate, the Dyson family office continues to invest heavily in UK agriculture. Dyson Farming has received over £120 million in direct investment, producing cereals, potatoes, and out-of-season strawberries, as well as operating an anaerobic digestion power plant that supplies energy to 10,000 homes.

Alternative candidates for the UK family office ranking by AUM

Our experienced familyofficehub.io research team has considered multiple alternative UK billionaires while creating this analysis. For instance, we have considered Michael Platt, who is worth $18bn. The hedge fund manager transformed its firm, BlueCrest Capital Management, into a family office a few years ago. However, we decided to focus on the the Dyson family office as the largest family investment vehicle, since the current AUM of Platt’s family office is not disclosed. Also, Jim Ratcliffe, the owner of Ineos, is operating a family office. However, we do not have reliable information on the scale of its operations and AUM. An alternative candidate would also have been Reuben Brothers, the family office of the Reuben family, which is active in real estate, venture capital, hospitality, data centers, debt, and further verticals. However, the AUM should be lower than that of the Dyson family office. We acknowledge that Dyson has relocated some of his family office’s operations to Singapore, which should be taken into account when analyzing the UK’s largest family offices.

Picture Source: Cj, Unsplash+ (30.04.2025)