Noted investor Cathie Wood’s ARK Invest made its largest investment in Coinbase’s (COIN) stock since Dec. 14 on Thursday, adding about $5.5 million of the crypto exchange’s shares, based on closing prices. The firm bought more than 158,000 shares for its ARK Fintech Innovation ETF. Coinbase’s stock closed at $34.78 in New York Thursday, up roughly 7%. The shares have fallen 86% this year.