https://www.cnbc.com/2018/10/26/jeff-bezos-loses-as-much-as-14-billion-in-personal-wealth.html

Amazon CEO Jeff Bezos lost as much as $14 billion in personal wealth as Amazon's stock plummeted 8 percent at the open on Friday. The plunge was a reaction to Amazon's earnings report, which revealed disappointing revenue and guidance for the upcoming holiday season.

Bezos' net worth was $138 billion on Wednesday, according to Bloomberg.