[Ark Invest Increases Holdings by 170,600 Shares of SpaceX, Reduces 41,300 Shares of Robinhood] According to The Block, Ark Invest purchased 170,600 shares of SpaceX on Monday, valued at approximately $20.5 million, as SpaceX's stock price dropped 3.3% that day. Meanwhile, Ark Invest sold 41,300 shares of Robinhood stock, valued at approximately $4.1 million.