Anthropic Files Confidential IPO Paperwork at $965 Billion Valuation

Anthropic filed a confidential S-1 registration statement with the US Securities and Exchange Commission on June 1, setting the stage for a public listing that could value the company at close to $965 billion. The filing was confidential, meaning full IPO details remain private until the company formally begins its roadshow — expected sometime in fall 2026.

The move comes just days after Anthropic closed a $65 billion Series H funding round, one of the largest private venture rounds ever recorded. The round was led by Altimeter Capital, with Dragoneer, Greenoaks, and Sequoia Capital participating. Anthropic's annualized run-rate revenue stood at $47 billion as of May 2026 — an extraordinary trajectory for a company founded in 2021.

Claude at the Center of Anthropic's Commercial Story

Anthropic's commercial growth has been driven by enterprise adoption of Claude, its AI assistant and API platform. Claude Code — a developer tool that generates, reviews, and debugs code — has become a flagship product, alongside Claude's broader deployments in legal, medical, and customer-service workflows. The company has positioned itself as the safety-first alternative to OpenAI's GPT products, an argument that has resonated with regulated industries and large enterprises with strict compliance requirements.

"Claude's latest advancements have driven large-scale adoption among the world's most demanding organizations. This momentum positions Anthropic to lead the next phase of AI innovation," said Brad Gerstner, founder and CEO of Altimeter Capital, commenting on the Series H.

What a $965 Billion IPO Would Mean

A listing at that valuation would place Anthropic above Meta's current market cap and in the same tier as Apple, Nvidia, and Microsoft — companies with decades of products, infrastructure, and cash flow behind them. For context, OpenAI's most recent private valuation stood at approximately $300 billion; an Anthropic IPO at nearly three times that would reshape how investors think about AI company valuations.

A public listing would also create liquidity for early employees and investors who have been locked into private shares since the company's founding. Anthropic was spun out of OpenAI in 2021 by Dario Amodei and several colleagues, originally focused on AI safety research. It has since grown into a full commercial AI platform while maintaining its constitutional AI and safety-first research orientation.

The SEC review period for a confidential S-1 typically runs six to twelve weeks before a company can begin the public roadshow process. With the filing submitted in early June, an autumn listing remains plausible if markets remain receptive.