(Reuters) - Tesla CEO Elon Musk's net worth crossed $400 billion on Thursday, the Forbes real-time billionaires list showed, boosted by a nearly 71% surge in the automaker's shares this year and the soaring valuation of his rocket company SpaceX.

Musk is Tesla's largest shareholder with about a 13% stake in the company. The EV maker's shares rose to a record high of $424.9 on Wednesday, extending a rally that kicked off following the Nov. 5 election.