Elon Musk, CEO of Tesla, SpaceX, and xAI, ranked first on the 2024 Forbes 400 list of billionaires with a net worth of $334 billion. His companies have potential conflicts of interest with the federal government, and Tesla is under investigation by the National Highway Traffic Safety Administration for safety issues related to its autonomous driving and 'full self-driving' features, with at least 30 fatal accidents reported. Musk owns about 54% of the artificial intelligence startup xAI, which is valued at $50 billion and reportedly has annualized revenues of $100 million. In April 2023, Musk fell from being the world's richest person to the second richest due to a drop in Tesla's stock, but regained the title of 'world's richest' in June 2023 as Tesla's stock rebounded. Musk owns about 74% of Twitter, with other investors including Saudi Prince Alwaleed bin Talal, Twitter co-founder and former CEO Jack Dorsey, and cryptocurrency company Binance. After acquiring Twitter, he laid off nearly 75% of the staff and changed the company's name to X in July.