SpaceX Overtakes OpenAI as World's Most Valuable Private Company at $1.25 Trillion

SpaceX-xAI Merger Creates History's Most Valuable Private Company Elon Musk's SpaceX has emerged as the world's most valuable private company, reaching a staggering $1.25 trillion valuation following its merger with xAI, his artificial intelligence venture. This milestone places SpaceX ahead of OpenAI, which itself has soared to $840 billion after securing the largest single investment ever made in a private company — a $110 billion funding round backed by Nvidia, SoftBank, and Amazon. The Unicorn Landscape: U.S. Dominance As of March 2026, a total of 1,705 startup companies have reached unicorn status globally, with the United States accounting for 881 of them — more than half of the world's billion-dollar private companies. Key valuations among the top-tier U.S. unicorns: SpaceX (+ xAI): $1.25 trillion OpenAI: $840 billion Anthropic: $380 billion Stripe: $159 billion Databricks: $134 billion Waymo: $126 billion Secondary Market Implications These record valuations are reshaping secondary market dynamics. Pre-IPO shares in SpaceX, OpenAI, and Anthropic are trading at historically high premiums, with limited supply driving intense competition among institutional buyers and family offices seeking direct exposure. The SpaceX-xAI merger has also complicated secondary pricing, as market participants reassess the combined entity's revenue synergies and IPO timeline. "The concentration of value in a handful of AI-driven private companies is unprecedented. Secondary buyers are now underwriting not just business fundamentals but also merger integration risk." — Secondary market analyst commentary Why This Matters for Private Markets The SpaceX-xAI merger sets a new precedent for private company consolidation and valuation discovery. For secondary market participants, the combined entity creates both opportunity and complexity: while the $1.25 trillion valuation headline attracts capital, buyers must now diligence two previously separate business models under one cap table. Meanwhile, the OpenAI $840B benchmark is recalibrating pricing expectations across the AI secondary market, potentially pulling up bid prices for Anthropic, xAI stand-alone interests, and adjacent AI infrastructure plays.