Ark Invest, led by Cathie Wood, has expanded its portfolio by acquiring significant shares in Robinhood, Bullish, and Circle. The investment firm added 433,806 shares of Robinhood, valued at approximately $33.82 million, 364,134 shares of Bullish, worth around $11.6 million, and 75,559 shares of Circle, totaling about $4.37 million. This move reflects Ark Invest's continued interest in fintech and cryptocurrency-related companies.