(FILES) Elon Musk looks on as US President Donald Trump speaks at the US-Saudi Investment Forum at the John F. Kennedy Center for the Performing Arts in Washington, DC on November 19, 2025. Elon Musk's SpaceX has filed confidential papers with US securities regulators to go public, US media reported on April 1, 2026. The filing, which could be the largest initial public offering of all time, puts SpaceX on track to list on a public exchange by July, according to the Wall Street Journal and Bloomberg, which cited people familiar with the matter. (Photo by Brendan SMIALOWSKI / AFP via Getty Images)