Robinhood shares tumble after PayPal news, SEC scrutiny of key revenue stream

Shares of Robinhood Markets Inc (HOOD.O), a popular gateway for trading meme stocks, tumbled nearly 7% on Monday on news that PayPal Holdings Inc (PYPL.O) may start an online brokerage and a report saying regulators were looking at a possible ban on a practice that accounts for the bulk of the company’s revenue.