Tesla and SpaceX, two of the companies under Mr Musk’s control, are the predominant reasons as to why he’s accumulated such a staggering fortune.
Tesla, the world’s most valuable electric car manufacturer, crossed the $1 trillion (£748.4 billion) mark for the first time this year.
Altogether, he owns 21 percent of the car manufacturer but has pledged more than half his stake as collateral for loans.
Last year, Mr Musk explained via Twitter that he does not “take a cash salary or bonus from anywhere”, only stock.