Oracle Co-founder Larry Ellison has overtaken Microsoft Co-founder Bill Gates as the world's fourth-richest person with $130 billion in wealth. The optimism around AI boosted both Oracle's stock and Ellison's wealth, Bloomberg said. Elon Musk is the world's richest person with $225 billion wealth, followed by Bernard Arnault, Jeff Bezos, Larry Ellison, Bill Gates, Warren Buffett and Steve Ballmer.