Jeff Bezos own approximately 16% shares of Amazon stock. As of Bezos' most recent reporting with the Securities and Exchange Commission on August 14, 2018, the Amazon CEO owned 78.88 million shares of the company. Commonly, the people who own the highest number of shares have the opportunity to be one of the directors of the company. Amazon has about 16 people who are part of their board of directors and executive officers.
These are people with huge investments in the company, and the future of the company is in essence in their hands. As of date, Jeff Bezos is the richest person in the world. Now, this factor may change according to several variations. The market price of stocks move up and down each day, and as the price of Amazon stock fluctuates, the wealth of people like Jeff Bezos will also fluctuate.
When the price of the stock of other companies change, that will affect the standing of Jeff Bezos as the richest man will also change. He may remain the richest person or another may become the richest. This of course, is apart from the percentage of Amazon stock that Jeff Bezos owns.