• Elon Musk has lost roughly $650 billion in wealth since SpaceX's June peak, yet remains worth more than $700 billion—about 45 times the fortune of China's CXMT billionaire Zhu Yiming.
  • The sharp decline is driven by slides in Tesla (TSLA) and SpaceX shares, amid a broader tech stock pullback and investor skepticism about AI-driven valuations.
  • Market observers see Musk's volatile wealth as a barometer for whether AI growth narratives can justify lofty price tags for mega-cap tech companies.

A Trillion-Dollar Fall

Elon Musk's net worth has been on a wild ride. After SpaceX's dramatic public market debut in 2026 briefly pushed him toward trillionaire status, the tide has turned. Since June, his fortune has tumbled by roughly $650 billion, according to people familiar with the matter. Yet even after the drop, Musk remains the world's richest person by a wide margin, with a net worth exceeding $700 billion.

The plunge reflects a broader retreat in tech stocks, particularly Tesla and SpaceX. Tesla shares have slid as EV demand concerns mount and competition intensifies. SpaceX, meanwhile, has faced headwinds from a softening space-tech sector and profit-taking after its IPO pop. "The market is recalibrating expectations for AI-fueled growth," said an analyst who asked not to be named. "Investors are asking whether current valuations are sustainable."

AI Hype Meets Reality

Musk's wealth trajectory is seen as a proxy for the AI boom's limits. His companies—Tesla in autonomous driving and SpaceX in satellite internet—are heavily tied to AI narratives. But the recent sell-off suggests growing caution. "Without a clear path to monetizing AI at scale, even the most visionary founders aren't immune to market sentiment," another source noted.

Attempts to reach Musk for comment were unsuccessful. A representative for Tesla declined to comment, and SpaceX did not respond to inquiries.

Correction: A previous version of this article misstated the timing of SpaceX's IPO. It debuted in 2026, not earlier. The error has been corrected.