SpaceX filed its S-1 IPO prospectus with the SEC, claiming a $28.5 trillion total addressable market across three verticals: $370 billion in space-enabled solutions, $1.6 trillion in Starlink broadband and mobile connectivity, and $26.5 trillion in AI infrastructure and applications. The filing represents SpaceX's first public regulatory disclosure of its financials and strategy after years as a private company. This positions SpaceX as pursuing the largest claimed market opportunity in corporate history, extending far beyond traditional launch services into global internet and artificial intelligence.