If Bill Gates had held on to his Microsoft shares instead of selling them, he might have ended up wealthier than Elon Musk and Jeff Bezos combined. Gates had the equivalent of 2.06 billion shares in Microsoft in September 1998, when the software maker first became the most valuable company in the world, according to data compiled by Bloomberg. Microsoft regained the top spot from Apple on October 29. Gates' stake from 1998 would have been valued at approximately $693 billion last Friday, surpassing Musk's net worth of $340.4 billion and Bezos' net worth of $200.3 billion combined. Gates sold the vast majority of his Microsoft shares before leaving the board in 2020.