[Ark Invest Increased Holdings of $21 Million in Block Stock and $2.3 Million in SpaceX Stock Yesterday] According to The Block, Cathie Wood's Ark Invest purchased approximately $21 million worth of Block Inc stock on Thursday as its share price dropped 6%, while also buying approximately $2.3 million worth of SpaceX stock. SpaceX rebounded 6% on the same day, following a 13% drop the previous day.