[Ark Invest Increased $20.5 Million in SpaceX Stock Yesterday, Reduced $4.1 Million in Robinhood Stock] According to The Block, Cathie Wood's Ark Invest purchased 170,634 shares of SpaceX stock (SPCX) on Monday, valued at approximately $20.5 million, as SPCX dropped 3.3% on the day. On the same day, Ark sold 41,322 shares of Robinhood stock (HOOD), valued at approximately $4.1 million.