Jeff Bezos
When markets opened on July 27, 2017, Bezos briefly became the world's richest person, surpassing Bill Gates with a net worth of just over $90 billion. He lost the title later in the day when Amazon's stock dropped, returning him to second place with a net worth just below $90 billion. On October 27, 2017, Bezos again surpassed Gates on the Forbes list as the richest person in the world.