Anthropic's confidential SEC filing and targeted $1.8–2 trillion valuation for a potential mid-November Nasdaq debut position it as the frontrunner, driven by its annualized revenue run rate exceeding $65 billion and expectations of topping SpaceX's June 2026 record $1.77 trillion IPO. SpaceX's completed listing at that level, now trading near $2 trillion amid Starlink profitability and AI integration, keeps it competitive but caps its 2026 IPO size. xAI's February acquisition by SpaceX eliminates a standalone path, shifting exposure to the public SpaceX ticker while OpenAI and others face later timelines or smaller scales. Key catalysts include Anthropic's upcoming roadshow and any final valuation adjustments before year-end resolution.