[Ark Invest Increased Coinbase Stock by $18.4 Million Yesterday, Reduced Robinhood Stock by $29 Million] According to The Block, Cathie Wood's Ark Invest purchased $18.4 million worth of Coinbase stock on Wednesday while selling nearly $29 million worth of Robinhood stock. Coinbase closed down 2.57% at $164.92 on the day, while Robinhood closed up 8.78% at $105.20. Robinhood remains the fourth-largest holding in ARKK, accounting for 4.87%, while Coinbase is the eighth-largest holding, accounting for 3.71%.