Elon Musk has become the first person in history to achieve a net worth of $400 billion, according to the Bloomberg Billionaires Index. The milestone was driven primarily by surging valuations of Tesla and SpaceX, his two largest holdings.

Tesla's stock has more than doubled over the past year as the company's robotaxi service exceeded expectations and its energy storage business achieved profitability. Meanwhile, SpaceX's latest funding round valued the rocket company at $350 billion following successful Starship missions.

Musk's wealth now exceeds the combined fortunes of Jeff Bezos, Bernard Arnault, and Mark Zuckerberg.