Bill Brewster, an analyst at Sullimar Capital who is related to Kearns by marriage, said Robinhood should change how it displays information. "When you're dealing with retail money and actively soliciting traders under 30 years old, to have errors like this is inexcusable and at the minimum negligence," he told CNBC. Robinhood told the network it is reviewing its options product "to determine if any changes may be appropriate."