Elon Musk has become the first person to cross the trillionaire threshold, at least on paper, after SpaceX priced its blockbuster initial public offering at $135 a share. Before the IPO, Musk was worth an estimated $813 billion, a fortune more than twice as large as the planet's second-richest person, Google co-founder Larry Page, who is worth an estimated $288 billion, according to Forbes. SpaceX formally setting its stock price at $135 boosted Musk's fortune to just over $1 trillion. The shares, which will trade under the ticker symbol "SPCX," are poised to begin trading on Friday after the Nasdaq Composite index opens at 9:30 a.m. If SpaceX rises above $135 per share, Musk's wealth will climb further, though he could fall below the trillionaire threshold if the stock sinks. Show more Show less