• Tesla CEO Elon Musk dropped to second on Forbes' list of the richest people, behind Amazon CEO Jeff Bezos.
• Tumbling shares of Tesla, his electric-vehicle company, on Monday chopped $13.5 billion off his fortune, according to Forbes' calculations.
• Bezos regained the top spot on Forbes' list with a fortune of $182.1 billion, compared with Musk's $176.2 billion.
• Musk takes a small salary from his companies but has substantial stakes in Tesla and SpaceX.
After briefly topping Forbes' list of the richest people, Elon Musk fell back to second place, behind Amazon CEO Jeff Bezos. Tumbling shares of Tesla, his electric-vehicle company, on Monday chopped $13.5 billion off his fortune.
Musk on Thursday became the world's richest person; his fortune grew by more than $150 billion in a year.
But Tesla shares fell by nearly 8% on Monday, their largest one-day fall since late September. Based on Forbes' estimates, this pushed his total wealth down to $176.2 billion, compared with Bezos' $182.1 billion fortune.
Despite Musk's wealth loss, his net worth is still $20 billion above Bernard Arnault, the CEO of the French luxury-goods conglomerate LVMH and the world's third-richest person, according to Forbes' estimates.
As of Tuesday morning, Musk still topped Bloomberg's Billionaires Index: It said he had $194 billion compared with Bezos' $183 billion. Its calculations took into account a loss for Musk of $15.6 billion.
Though Musk takes a small salary from his companies, he has a roughly 20% stake in Tesla and a 48% stake in his aerospace company, SpaceX, as well as 57 million vested Tesla stock options, according to Bloomberg.
Tesla had a booming 2020: It delivered nearly 500,000 vehicles, and its stock price rocketed 740% over the year.
His compensation package also awards him stock when Tesla achieves certain goals. That made Musk the highest-paid executive in 2020, according to Bloomberg.
Musk, who is also known for his opinionated and at times cryptic tweets, posted an understated response after he was declared the world's richest person on Thursday.
"How strange," he tweeted, adding, "Well, back to work ..."
In December, he told Mathias Döpfner, the CEO of Insider's parent company, Axel Springer, that he was selling all his possessions to fund a future colony on Mars.
He recently sold several expensive pieces of property, including three neighboring homes in the Bel-Air neighborhood of Los Angeles.