Twenty-four years after Elon Musk founded SpaceX with $100 million of his own capital and a stated goal of making humanity multiplanetary, the company is hours away from becoming a publicly traded stock. SpaceX prices its shares tomorrow evening June 11 at a fixed $135 per share, targeting a $1.75 trillion valuation and a $75 billion raise — the largest initial public offering in the history of global capital markets. Trading begins Thursday June 12 on the Nasdaq under the ticker SPCX.