ForbesElon Musk is working to revolutionize transportation both on Earth, through electric car maker Tesla - and in space, via rocket producer SpaceX. He owns 21% of Tesla but has pledged more than half his stake as collateral for loans; Forbes has discounted his stake to take the loans into account.
https://www.forbes.com/profile/elon-musk/[https://www.forbes.com/profile/elon-musk/?list=rtb/&sh=229371d07999]
Just that 1-day increase is more than the individual wealth of all but 189 people in the world.