SpaceX shares begin trading in biggest IPO ever — valuing company at more than $2 trillion

Shares of SpaceX opened at $150 each on their first day of trading in the company's landmark initial public offering – making founder Elon Musk the world's first trillionaire.  Some 555.6 million shares of SpaceX – which operates a rocket, satellite internet and artificial-intelligence businesses – were sold of the in the hotly anticipated IPO