Corient buys $21bn Summit Trail Advisors, pulling more outsourced family office work into its orbit

Corient has agreed to acquire Summit Trail Advisors, a New York registered investment adviser with about $21 billion in client assets, the Miami-based firm said on 5 August. Summit Trail works mainly with ultra-high-net-worth individuals and families, alongside some institutional clients, and the deal is expected to close in the third quarter.

Summit Trail will leave the Dynasty Financial Partners network, which it joined in 2015 after a group of former Barclays advisers left to set up their own firm. Its senior leaders, led by co-founder and managing partner Jack Peterson, will become partners of Corient, and the business will take the Corient name.

The part worth noting for families is what Corient gains beyond the assets. Summit Trail brings outsourced family office and chief investment officer services, working across investment management, estate planning and both public and private markets. It also gives Corient offices in New York, Boston, Chicago, Dallas, Denver, Minneapolis, San Francisco and Seattle. In other words, a consolidator is absorbing exactly the kind of tailored, single-client capability that many families have looked to independent boutiques to provide.

“What drew us to Corient was its partnership model, the only one of its kind in wealth management, and the collaboration it fosters across the organisation,” Peterson said in a statement. Kurt MacAlpine, Corient’s founding partner and chief executive, called the decision by a firm of Summit Trail’s calibre “meaningful validation” of the partnership structure.

That structure is Corient’s central pitch. The firm now counts around 300 partners and more than 2,700 employees, and it holds roughly $556 billion in assets under management and administration, which puts it among the largest RIAs in the world. It is owned by Abu Dhabi’s Mubadala, whose Mubadala Capital took the former CI Financial private in 2025; Corient grew out of the rebranding of CI Financial’s US wealth arm.

Most of that scale has been bought rather than built. In July, Corient agreed to acquire Seven Bridges Advisors, a New York firm with $4.9 billion under management, and the month before it completed the purchase of two UK advisory businesses overseeing a combined $175 billion, a transaction it had worked on since September 2025. Summit Trail has been acquisitive in its own right, adding a $3 billion team from BMO in 2024.

On the Summit Trail deal, Ardea Partners acted as financial adviser and Seward & Kissel as legal counsel, while Goldman Sachs advised Corient with Sidley Austin as legal counsel.

For families weighing where to place their advisory relationships, the deal sharpens a question the sector keeps returning to. Outsourced family office and CIO work has long been sold as high-touch and independent, close to the family and free of outside pressure. As those teams move inside a firm answering to sovereign wealth backing and managing more than half a trillion dollars, the trade-off becomes clearer. A larger platform can widen access to private markets and spread the cost of technology and compliance. It can also mean more layers between a family and the people who actually handle its affairs, and turnover among those people over time.

Corient’s partnership model is its answer, and the retention of Summit Trail’s senior team as partners is meant to hold the client relationships in place. Whether that promise survives at this size is something families will judge over the years that follow, not from the announcement itself.