cathie wood’s ark investment management continues to buy up shares in beatendown cryptocurrency broker coinbase global even as the stock keeps falling and the consensus on wall street is far more muted the investment group’s flagship exchangetraded fund ark innovation etf ticker arkk bought up 78982 shares in coinbase coin last week according to a trading update last friday based on the stock’s closing price on dec 9 it represents adding some 32 million to the etf’s position in the digital asset trading platform