Robinhood's stock surged 6% following Ark Invest's acquisition of $21.3 million in shares, led by CEO Cathie Wood. The investment firm purchased 131,049 shares through its ARKK ETF and 36,440 shares via ARKW, elevating Robinhood to nearly 19% of both funds' holdings. This move aligns with Ark's ongoing crypto strategy, which includes Bitcoin ETF filings and investments in Coinbase, Bullish, and BitMine. Robinhood is also expanding its crypto operations, having acquired WonderFi and Bitstamp, and is developing a Layer-2 blockchain on Arbitrum while adding BNB trading.