[Ark Invest Sells $6.1 Million in Block Stock and $1.13 Million in Bullish Stock Yesterday] According to The Block, Cathie Wood's Ark Invest sold $6.1 million worth of Block stock and $1.13 million worth of Bullish stock through its ETF on Monday. Meanwhile, Ark bought $16.2 million worth of Nvidia stock as its share price fell 4.3%.