Understand who ultra-high-net-worth individuals are and how they invest. Learn about six key investment mistakes the ultra wealthy avoid. : The ultra wealthy, known as ultra-high-net-worth individuals (UHNWIs), make up a group of people who have net worths of at least $30 million. The net worth of these individuals consists of shares in private and public companies, real estate investments and personal investments, such as art, airplanes and cars. When people with lower net worths look at these UHNWIs, many of them believe that the key to becoming ultra wealthy lies in some sort of secret investing strategy.