Tesla's stock price fell 3.65% on Monday to close at $181.06 as the media continued to dig deeper into Musk's suspected drug abuse and the brokerage Piper Jaffray lowered the company's target stock price. Tesla shares are down nearly 28% so far this year. Musk's personal wealth is estimated to have lost more than $24 billion so far this year to $205 billion, but he remains the No. 1 richest person on the Bloomberg Billionaires Index.
In contrast, Amazon founder Jeff Bezos' wealth increased by US$20 billion this year to US$197 billion, rising to second place on the rich list, only US$8 billion behind Musk. Amazon's shares are up 13% this year.
Notably, the Bloomberg Billionaires Index's estimate of Musk's wealth still includes the value of about 304 million stock options in his 2018 compensation plan, even though that plan was recently invalidated by a Delaware court.
Bezos' net worth is now only 4% behind Musk's, and he could soon overtake Musk if Amazon's stock price continues to rise or Tesla's stock price continues to fall.
As of the end of December last year, Bezos owned 988 million Amazon shares, accounting for nearly 10% of Amazon's shares.
At the same time, Musk holds about 411 million Tesla shares, accounting for about 13% of the company's shares, worth about $76 billion. His holdings in SpaceX, X Corporation and other ventures make up the rest of his wealth.