SpaceX confirmed plans to sell shares of its stock to the public for the first time, according to a securities filing Wednesday outlining the company’s fundamentals. The initial public offering could make CEO Elon Musk the world’s first trillionaire, a milestone that underscores the extraordinary wealth the tech industry has amassed over three decades. SpaceX’s IPO is expected to draw wide investor interest because of the company’s success in rockets and satellite-based internet — two areas