Elon Musk's SpaceX company has floated on the Nasdaq stock exchange, with shares climbing more than 25% above the opening price. This makes Musk the world's first paper trillionaire, at least by market capitalization.

At US$135 a share, the offering will raise US$75 billion, making it the biggest market debut in history.

At US$135 a share, the offering will raise US$75 billion, making it the biggest market debut in history.