This is quite the turnaround story. Cathie Wood is a famous name on Wall Street and the chief executive officerof Ark Invest, an investment management firm with a particular focus on disruptive innovation. One company that Wood and her team have been bullish on for a while is Robinhood Markets (HOOD 1.97%), a stock trading app. Ark Invest first bought shares of Robinhood in 2021, and although it faced significant volatility at the time, things have improved significantly since then. Robinhood's shares have ...