Anthropic Files for IPO at $965B — Beating OpenAI to the Public Markets

Anthropic filed a confidential S-1 with the SEC on June 1, 2026 — setting up what could become the largest pure-play AI IPO in history. The filing comes just days after the company closed its Series H at a $965 billion valuation, nearly tripling the $380 billion it commanded in February.

The timing is strategic. OpenAI is still preparing its own confidential filing, targeting late 2026 at an $852 billion valuation. SpaceX-xAI prices on June 11 at a $1.75 trillion target. Anthropic is threading the needle — filing before OpenAI to claim the “first pure-play AI public company” narrative, while avoiding the SpaceX-xAI pricing window.

The Numbers Behind the Filing

Anthropic raised $65 billion in its Series H in late May — a war chest that makes the IPO less about raising capital and more about establishing a public market valuation, creating employee liquidity, and building the institutional investor base needed for a company that will spend tens of billions annually on compute.

The $965 billion valuation puts Anthropic in rare air. For context, that’s larger than Meta was worth in early 2023, larger than Nvidia was worth in early 2024, and roughly 3x the valuation of the entire global cybersecurity industry. Salesforce’s early stake alone is now worth approximately $5 billion.

Claude — Anthropic’s flagship model — has become the default AI for enterprise coding, legal analysis, and research workflows. The company does not disclose revenue publicly, but industry estimates place its annualized run rate between $8-12 billion, growing at triple-digit rates.

Anthropic vs OpenAI: The IPO Race

The competitive dynamic between Anthropic and OpenAI has moved from model benchmarks to corporate structure. Both companies are now racing to go public — and the order matters.

Anthropic’s advantage: it was born as a for-profit corporation with a safety-focused governance structure. There’s no messy nonprofit-to-profit conversion to explain to public market investors. OpenAI spent the last 18 months unwinding its original nonprofit structure, dealing with board drama, and restructuring equity — complexities that Anthropic simply doesn’t have.

OpenAI’s advantage: scale. GPT-5 and the ChatGPT consumer brand give OpenAI a distribution moat that Anthropic hasn’t matched. ChatGPT has 400 million+ weekly active users. Claude’s user base, while growing rapidly in enterprise, is smaller in consumer adoption.

The market will ultimately decide which matters more: Anthropic’s cleaner corporate structure and enterprise focus, or OpenAI’s consumer scale and brand recognition. The answer to that question sets the valuation template for every AI company that follows.

Three AI Mega-IPOs in One Year

The public markets are about to absorb three AI listings that collectively could exceed $3.5 trillion in combined market cap:

• SpaceX-xAI — June 12, targeting $1.75 trillion. Combines Starlink infrastructure with Grok AI. $75 billion raise via 21-bank syndicate.
• Anthropic — timeline TBD, ~$965 billion valuation. Pure-play AI safety company. Claude as the enterprise standard.
• OpenAI — targeting Q4 2026, ~$852 billion valuation. Consumer AI leader. $6.6 billion in employee stock already traded on secondary markets.

The question isn’t whether public markets can absorb $3.5 trillion in AI listings. It’s whether these companies can justify those valuations with revenue growth before the next market correction forces a repricing. The AI economy is betting that the answer is yes — but the margin for error at these multiples is essentially zero.

For the full structural map of the AI economy, read The Map of AI Redrawn on Business Engineer.