(FILES) SpaceX, Twitter and electric car maker Tesla CEO Elon Musk looks on as he speaks during his visit at the Vivatech technology startups and innovation fair at the Porte de Versailles exhibition center in Paris, on June 16, 2023. Elon Musk's SpaceX began its first day as a public company on Wall Street on June 12, 2026, after the biggest initial public offering in history, with the polarizing entrepreneur promising he will take humanity to Mars. The blockbuster operation, which raised more than $75 billion, is expected to make Musk the world's first trillionaire and kick off a series of major IPOs by AI companies in the coming months. (Photo by Alain JOCARD / AFP via Getty Images)