Elon Musk, the CEO of Tesla and SpaceX, has set a new world record for the worst loss of fortune in history.

According to the Bloomberg Billionaires Index, Musk's net worth fell by $15.2 billion in a single day on January 7th, 2021.

The drop in Musk's net worth was due to a decline in Tesla's stock price, which fell by 8.6% on that day.

Despite this loss, Musk is still one of the wealthiest people in the world, with an estimated net worth of $138 billion.