Ark Invest has increased its holdings in several companies, including Coinbase, Circle, and Bullish, amid a stock rally. The investment firm has also made adjustments to its portfolio, trimming its stake in Robinhood, while some reports indicate it has also cut its holdings in other companies such as Alibaba and Baidu. The exact scope and details of Ark Invest's moves are not entirely clear, with some reports mentioning additional investments in other areas, such as AI and crypto stocks.