- Elon Musk's estimated fortune has fallen below $1 trillion again as declines in Tesla and SpaceX shares reduce the value of his holdings, highlighting how quickly the world's richest person's wealth can change with market valuations.
Elon Musk's net worth dropped below the $1 trillion threshold in mid-October after a brief return to trillionaire status earlier in the month. Forbes' real-time billionaire rankings put his fortune at approximately $944.8 billion at the close of trading on October 14, while a subsequent reading on October 16 placed it near $924.8 billion.
The decline follows a volatile stretch for Musk's wealth. His estimated fortune had climbed above $1 trillion in early October as shares of SpaceX and Tesla recovered, but the rally proved short-lived as both companies' valuations came under pressure.
A Forbes report said Musk lost approximately $17.6 billion during Wednesday morning trading as SpaceX shares fell about 1.5% and Tesla shares dropped 1.9%. The losses came after a hotter-than-expected US inflation reading unsettled financial markets.
The latest decline does not mean Musk has lost his position as the world's richest person. His estimated fortune remains substantially larger than those of other leading billionaires, but the repeated moves above and below $1 trillion illustrate the sensitivity of his wealth to changes in the value of his business interests.
Tesla and SpaceX Shares Drive Musk's Wealth Swings
Musk's fortune is closely tied to his holdings in SpaceX and Tesla Inc. (NASDAQ: TSLA), making changes in their valuations the main drivers of his estimated net worth. Tesla shares are affected by electric vehicle demand, profit margins, competition and expectations for the company's artificial intelligence and robotics businesses. SpaceX, which went public in June 2026, has also experienced significant share-price volatility since its market debut.
The decline in Musk's wealth follows a sharp reversal in SpaceX shares after their initial post-IPO surge. The stock's performance has been closely watched by investors because SpaceX accounts for a substantial portion of Musk's estimated fortune.
Wealthier Today's report of SpaceX's October rebound and Musk's return to trillionaire status documented how rising shares in both companies pushed his estimated net worth above $1 trillion again in early October.
The subsequent pullback shows how quickly that milestone can reverse. Unlike income from a salary or a completed asset sale, most of Musk's estimated wealth is tied to equity valuations. A decline in the market value of his holdings can therefore reduce his paper fortune by billions of dollars without an equivalent cash outflow.
Inflation and Market Volatility Add Pressure
The latest decline in Musk's wealth coincided with a broader technology-stock sell-off after US inflation data came in hotter than expected. Higher inflation can influence expectations for Federal Reserve interest-rate policy, while elevated borrowing costs and uncertainty about future earnings can weigh on growth-oriented stocks.
The market reaction extended beyond Musk's companies. Forbes reported that several other technology billionaires also lost substantial wealth during the October 14 sell-off, including Michael Dell, Larry Ellison and Mark Zuckerberg.
The figures are estimates rather than cash balances. Billionaire rankings use different methodologies for valuing public shareholdings, private assets, options and restricted stock, so Forbes and Bloomberg may report different totals for the same individual. Their estimates can also change as stock prices move during trading.
Musk's net worth remains well above the fortunes of other billionaires, but the latest retreat underscores the risks of equating a market valuation with realized wealth. His ranking and estimated fortune could recover if Tesla and SpaceX shares rebound, or decline further if investor sentiment weakens.
For investors tracking Musk's companies, the next key indicators will be Tesla's operating performance, SpaceX's public-market valuation and broader appetite for technology stocks. Those factors will influence not only Musk's estimated fortune but also the market's assessment of the businesses that underpin it.