Funds managed by Ark Investment Management purchased approximately $27.9 million worth of Meta Platforms (META) stock on September 9. This move comes as Meta deepens its development in artificial intelligence and recently launched its Muse AI assistant. Concurrently, Cathie Wood's funds also sold approximately $28.7 million worth of Alphabet (GOOGL) stock on September 9 and 11. Meta's stock price has risen over 6% in the past week due to the launch of the Muse AI assistant, but it is still down approximately 1.8% year-to-date.