Musk's wealth could be even higher depending on the outcome of a shareholder lawsuit surrounding his 2018 pay package that's winding its way through court.
The pop on Thursday followed Tesla's better-than-expected earnings report late Wednesday and Musk's comments on the call suggesting that "vehicle growth" will be 20% to 30% next year. Tesla shares soared 22% at the close, their second-biggest gain since the company's IPO in 2010.