Rich Millennials Would Rather Manage Their Own Money, Thank You

Michael Martocci, a 26-year-old startup founder, ignores the golf invitations and other solicitations from the Goldman Sachs Group Inc. financial adviser trying to land him as a client.

Eighteen holes isn’t particularly appealing to the Miami-based Mr. Martocci, and neither is paying for financial advice. Instead, he oversees his hundreds of thousands of dollars in investments himself. He funnels 90% of his money into cryptocurrency. To check his stocks, he pulls up Robinhood Markets Inc. on his phone.