SpaceX floated on the Nasdaq stock exchange on Friday, with shares trading 25% above the opening price at one point. The IPO has made Musk the world's first trillionaire, at least on paper.

Rocketmaker SpaceX began trading on the Nasdaq Friday, boosting Musk’s fortune to an estimated $1.1 trillion.

The company offered 555,555,555 stocks at a price of $135 per share