Musk's fortune rose more than $6 billion Friday, according to Bloomberg, after Tesla's stock surged 10.8% to a record $1,544 per share. Its market value stood at $286.5 billion.

Musk owns 20.8% of Tesla's stock, making his stake worth just under $60 billion. Musk is also the primary shareholder of privately held SpaceX, as well as a privately held tunneling company.