But so do thousands of other American families who don’t belong to the billionaire class. At their core, family offices are a means to invest, preserve and pass on fortunes—not to build them de novo.

The investment office for Brazil’s billionaire Moreira Salles family hired Jason Siegel, the former head of Brookfield Asset ...

Stanley Druckenmiller’s family office led investment firms for the world’s rich in boosting allocations to US bank shares ...

The financial services giant lets wealthy clients pick and choose things like assistance with cybersecurity, alternative investments and estate planning.