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Expect Robinhood Stock to Stay Volatile Long After Its IPO


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People lining up for Robinhood T-shirts in lower Manhattan on July 29, the day the upstart trading platform went public.

Spencer Platt/Getty Images

Robinhood Markets got over its weak market debut, and in a hurry.

In its first full week of trading, the stock jumped 57%, to $55.01, well above its initial public offering price of $38. The surge came on very little news. The information that did come out was mixed: Fund manager Cathie Wood’s ARK Investments bought the stock, but some early investors also indicated they could now sell shares in the months ahead.

Robinhood’s...