SpaceX IPO: Elon Musk's SpaceX has set the stage high for a blockbuster initial public offering (IPO), potentially the biggest stock market listing in history. In a meeting with its team of bankers on Monday night, the company reportedly outlined details of its IPO, revealing about its plans to earmark a large portion of shares for retail investors. SpaceX also plans to host 1,500 of them at an event in June following the IPO roadshow launch.