Anthropic Files Confidential S-1 With SEC, Targeting IPO Near $965B Valuation

Anthropic took its first formal step toward a public listing on June 1, when the company confirmed it had confidentially submitted a draft registration statement on Form S-1 to the U.S. Securities and Exchange Commission. According to a statement published directly on Anthropic's website, the filing was made under Rule 135 of the Securities Act of 1933, and the company was explicit that no share count or offering price has been set.

The filing came less than a week after Anthropic closed a $65 billion Series H round led by Sequoia Capital, Dragoneer, Altimeter Capital, and Greenoaks, which pushed the company's post-money valuation to roughly $965 billion, as reported by Cryptopolitan. At that figure, a successful listing would rank among the largest technology IPOs ever attempted.

What makes this filing structurally interesting isn't the valuation. It's what goes on top of it. Anthropic isn't a standard Delaware C-corp. As detailed in an analysis by Klover.ai, the company is organized as a Delaware Public Benefit Corporation, a legal form that requires the board to balance shareholder returns against the company's stated public benefit purpose, which Anthropic has defined as the responsible development and maintenance of advanced AI. On top of that, Anthropic has a Long-Term Benefit Trust holding a special class of shares designed to eventually elect a majority of the board, according to a governance review published by Useluminix. That trust isn't going away at IPO. Any public shareholder is buying into both structures simultaneously.

For enterprise builders and developers, the governance question matters more than it might at a typical software listing. Anthropic's revenue run rate reportedly hit $47 billion annualized in May 2026, up from $9 billion in January, per TechStackIPO. Claude Code, the company's autonomous coding tool, has driven a meaningful share of new enterprise contracts, according to a Reuters report cited by TechStackIPO. That kind of growth makes it a real infrastructure vendor for engineering teams, not just an API curiosity. If the IPO constrains the company's ability to make long-cycle safety investments in exchange for short-term margin pressure, the product roadmap could shift in ways that matter to anyone building on Claude.

The filing also lands inside a peculiar competitive window. OpenAI filed its own confidential S-1 around May 22 and is reportedly targeting a September 2026 debut at a valuation exceeding $1 trillion, as reported by Cryptopolitan. That sequencing isn't trivial. OpenAI's public prospectus will set the comparables that analysts use to price Anthropic when its own S-1 becomes public. Anthropic gets to watch how the market digests OpenAI's burn rate, which TechStackIPO pegged at $3.5 billion per month, before finalizing its own narrative.

A confidential S-1 is not an IPO. The SEC review process typically takes months, and the company has said the offering remains contingent on market conditions. No exchange, ticker, or pricing window has been announced. But the paperwork is real, the regulatory clock is running, and the governance structure that gets disclosed in the public prospectus will be worth reading carefully. The mission language has always been in Anthropic's charter. What changes now is that it'll be in a document that retail investors are expected to sign off on.

Sources cited:
- Anthropic (official statement) (https://www.anthropic.com/news/confidential-draft-s1-sec)
- Cryptopolitan (https://www.cryptopolitan.com/anthropic-subits-s-1-filing-sec/)
- Klover.ai governance analysis (https://www.klover.ai/antrhopic_ipo_corporate_governance_and_capital_indepth_analysis_2026/)
- Useluminix ownership and governance review (https://www.useluminix.com/reports/company-overviews/what-do-we-know-about-the-anthropic-ipo/source/4)
- TechStackIPO (https://www.techstackipo.com/ipo/anthropic)