Cathie Wood's Ark Invest sold 526,991 shares of Block Inc. in the last two trading days. ARKK dumped 203,659 shares of Block Inc. on Tuesday and 323,332 shares of the company on Monday, according to the company's latest trading filings. Shares of Block closed up 1 percent Tuesday at $55.29. Shares of the payments company, led by Jack Dorsey, are down 36 percent so far this year. Block Inc. operates several businesses that play a key role in the cryptocurrency space, including its well-known subsidiary, Cash App. According to The Block's stock dashboard, this mobile payment service allows users to transfer money and participate in the buying, selling and holding of bitcoin.