Elon Musk's net worth fell below $700 billion on Monday, July 27, after a sharp decline in SpaceX shares [1].

This financial shift highlights the volatility of the aerospace sector following SpaceX's transition to a public company. Because a significant portion of Musk's wealth is tied to his equity in the company, the stock's performance directly impacts his standing as one of the world's wealthiest individuals.

The decline in Musk's personal fortune followed a broader rout in SpaceX shares. Since its initial public offering in June, the company has seen more than $1.2 trillion of its market capitalization erased [3, 5]. This sell-off drove Musk's personal wealth down by more than $20 billion [1, 2].

Reports on the exact magnitude of the loss vary. Forbes noted that Musk's wealth was just above $700 billion before falling by more than $20 billion [1]. However, MSN reported a more drastic decline, stating his net worth fell from $1.45 trillion to below $700 billion [4].

Tyler Roush of Forbes said Musk’s fortune has slipped below $700 billion for the first time since December [1]. The volatility has led to a significant change in the CEO's financial status.

Musk addressed the situation regarding his previous valuation. "I’m a former trillionaire," Musk said [2].

The decline occurred within U.S. stock markets where SpaceX shares are now traded [2, 3]. The continued slide in valuation reflects investor uncertainty following the company's recent public debut.

"I’m a former trillionaire."

The rapid erosion of SpaceX's market value suggests a disconnect between the company's private valuation and its performance as a public entity. While Musk remains exceptionally wealthy, the loss of trillionaire status underscores the risks associated with concentrated asset holdings in high-growth, high-volatility industries like commercial space flight.