Key Takeaways Elon Musk, the world's wealthiest person, is well on his way to becoming a trillionaire. A basic calculation would put Musk's SpaceX stake at around 40%. That would mean his SpaceX shares could be worth more than $330 billion today—and some$625 billion assuming a market valuation of $1.5 trillion for the company in 2026. Add that$330 billion figure to the value of his current Tesla holdings—the company's stock touched a record high on Tuesday—and that brings you to roughly $600 billion now, ...