Mark Zuckerberg surpasses Michael Dell to become the fourth richest person in the world

Mark Zuckerberg, CEO of Meta, surpassed Michael Dell to become the fourth richest person in the world, after Meta's shares rose more than 4% following the launch of the AI agent "Muse." His estimated wealth reached $266.4 billion, while Dell's wealth dropped to $265.4 billion.

Mark Zuckerberg, CEO of Meta, surpassed Michael Dell to become the fourth richest person in the world on Thursday, September 24, 2026. This advancement came after Meta's shares rose more than 4% following the launch of "Muse," the company's personal AI agent. Zuckerberg's estimated net worth reached $266.4 billion, coinciding with Meta's stock rising 4.5% to $777.59, marking its highest closing price this year. Zuckerberg's wealth grew by $25 billion on Monday alone. In contrast, Dell's wealth dropped by about $5 billion to $265.4 billion, and Dell Technologies shares closed down 2.5%. "Muse" recently topped the list of most downloaded free apps in the App Store. The article conveys information from news agencies without adding analysis or commentary from the editor.