Elon Musk's trillionaire status is based on his ownership of real assets like Twitter, Tesla, and about half of SpaceX, rather than cash in a bank.

Traders value SpaceX at approximately $2 trillion, making Elon Musk's half-ownership worth nearly a trillion dollars.

Elon Musk became the world's first trillionaire this week.

Elon Musk merged Twitter and his AI company XAI into SpaceX.