Musk cofounded seven companies, including electric car maker Tesla, rocket producer SpaceX and artificial intelligence startup xAI.
His other involvements include ownership of X Corp., the company that operates the social media platform X, and his role in the founding of the Boring Company, Neuralink, and OpenAI.
According to Forbes, Musk is worth more than $430.9 billion, the first person to cross that mark.
Musk, who says he's worried about population collapse, has ten children with three women, including triplets and two sets of twins.