In the wake of President Donald Trump's second inauguration on January 20, the collective fortunes of several billionaires, including Elon Musk, Jeff Bezos, and Mark Zuckerberg, have dramatically declined, losing a total of $209 billion within seven weeks following the event, according to Bloomberg's Billionaires Index.

The period surrounding Trump's election was initially beneficial for the world's wealthiest individuals, marked by a significant rise in stock market indices, with the S&P 500 reaching all-time highs.

Investor interest surged in equity markets and cryptocurrencies amid expectations that Trump's policies would bolster business growth.

Tesla's stock, led by Musk, surged by 98% post-election, hitting a record market capitalization.

Similarly, LVMH, owned by Bernard Arnault, saw a 7% increase in share value in the week leading up to the inauguration, adding approximately $12 billion to Arnault's net worth.

Additionally, shares in Meta Platforms, owned by Zuckerberg, rose by 9% prior to the inauguration and another 20% in the first four weeks of Trump's administration.

However, market conditions have sharply reversed since the inauguration.

The S&P 500 index has fallen by 6.4%, affected by various factors including government employee layoffs and a shift in Trump's stance on tariffs, which have contributed to stock market volatility, resulting in a 2.7% drop on the first trading day of his administration.

The combined market value of companies linked to the billionaires present at the inauguration has decreased by approximately $1.39 trillion since January 17, the last trading day before the inauguration.

The following outlines the financial impacts on some of these billionaire figures:

Elon Musk: Musk's wealth peaked at $486 billion on December 17, marking the highest recorded wealth on Bloomberg's index.

However, Tesla's stock has since retraced all its gains, largely due to a significant decline in European sales, dropping more than 70% in Germany during the first two months of the year, alongside a 49% decrease in shipments to China, returning to lows not seen since July 2022. This has resulted in a loss of $148 billion in his net worth.

Jeff Bezos: The Amazon founder's net worth has plummeted by $29 billion, following a 14% decline in Amazon's stock since January 17. Bezos previously engaged with Trump over postal services and his ownership of The Washington Post, publically congratulating Trump after his election and participating in private meetings to discuss policies.

Sergey Brin: The co-founder of Google has seen a $22 billion reduction in his wealth, impacted by Google’s parent company Alphabet’s stock, which fell over 7% following lower-than-expected quarterly revenue forecasts.

Brin, who holds a 6% stake in Alphabet, has a history of political protest against Trump’s immigration policies.

Mark Zuckerberg: The Meta Platforms CEO has lost $5 billion, with Meta experiencing an increase in stock value earlier this year but subsequently losing those gains.

The broader technology sector, represented by key players such as Alphabet, Amazon, Microsoft, and Nvidia, has faced a collective downturn, with its market index down by 20% since mid-December.

Bernard Arnault: The 76-year-old luxury goods mogul has seen his wealth decline by $5 billion.

Notably, LVMH’s stock experienced a sharp rise post-election but has since relinquished many of those gains.

Market analysts have suggested that upcoming tariffs on luxury goods could further harm sales, already on a downward trajectory.