And Microsoft (NASDAQ: MSFT) founder Bill Gates Combined. Musk owns so much of SpaceX because he used his own money to found the company, so he never had to give most of the ownership away while raising money. Now, it might surprise you to learn Musk’s Tesla stake is only worth $150 billion. Tesla is worth the exact same amount as SpaceX, but Musk owns 12% of it. So, why is Musk’s wealth growing as Tesla stock slips? Well, at the end of last year SpaceX was valued at $800 billion. That means Musk’s net worth has increased just under $200 billion this year from SpaceX and lost less than $20 billion from the drop in Tesla shares. What’s next for Musk: it’s rumored after its IPO SpaceX could be targeting a $1.5 trillion valuation. That would make him close to a trillionaire. And Musk just signed a new pay package with Tesla that could reward him with $1 trillion if he grows the value of the company by seven-fold. To do that, Musk would need to dominate robots and self-driving, but his net worth would soar to more than $3 trillion. That’s higher than the entire GDP of countries like Italy, Russia, Canada, and Brazil. About the Author