[Ark Invest Increases $16.6 Million in SpaceX Stock, Reduces $3.9 Million in Robinhood Stock] According to The Block, Ark Invest purchased $16.6 million worth of SpaceX stock on Wednesday, with SPCX dropping 0.60% on the day to $135.27. At the same time, Ark Invest sold $3.9 million worth of Robinhood stock, with HOOD rising 1.84% on the day to $115.54.