Robinhood Rise Brings Setbacks of Irate Traders, U.S. Probes (1)

Robinhood Markets has catapulted ahead of its online brokerage rivals with a smartphone app that has attracted an army of young investors. Yet with the company’s rise has come a litany of problems: trading outages, angry customers and regulatory probes.

Over the first half of the year, U.S. consumer protection agencies received more than 400 complaints about Robinhood -- roughly four times more than competitors like Charles Schwab Corp. and Fidelity Investments’ brokerage unit. The grievances, obtained via a public records request to the Federal Trade Commission, depict novice investors in over their heads, struggling to understand why they’ve lost ...