Anthropic Files Confidentially for IPO, Leapfrogging OpenAI to Market

The Claude maker's S-1 filing arrives with a $965 billion valuation and a $47 billion revenue run rate — setting up what could be the defining public offering of 2026.

Written by Elena Brooks · Bureau Business · Jun 2, 2026

The Filing

AnthropicPBC announced Monday that it has submitted a confidential draft registration statement on Form S-1 to the Securities and Exchange Commission. The filing does not include a proposed listing date, share count, or price range. "This gives us the option to go public after the SEC completes its review," the company said in a statement. "The proposed initial public offering will depend on market conditions and other factors."

Confidential filings are standard practice for high-profile companies that want to test regulatory waters before committing to a public timeline. Anthropic retains the ability to withdraw or delay if conditions shift.

The Numbers Behind the Filing

Anthropicis not going to market on narrative alone. The company disclosed a revenue run rate of $47 billion — up from $10 billion the prior year — a nearly fivefold increase that gives institutional investors a concrete growth trajectory to underwrite.

That figure lands alongside a $965 billion valuation, reached after a $65 billion Series H funding round announced last week. For context, OpenAI's most recently reported valuation was $852 billion. Anthropic has, at least on paper, pulled ahead.

The Competitive Angle

Anthropicwas founded in 2021 by a cohort of former OpenAI employees who left citing concerns about the company's strategic direction. Since then, the two firms have competed directly on model capability, enterprise contracts, and investor attention.

OpenAI has long held the brand advantage — ChatGPT's 2022 public launch gave it cultural saturation that Anthropic's Claude has been working to close. A successful IPO would give Anthropic something more durable than a valuation headline: a public currency, a liquidity event for employees and early investors, and a balance sheet less dependent on a small number of strategic backers.

OpenAI is also reported to be planning a public offering this year. Anthropic's filing means it now controls the sequencing.

Market Conditions: Complicated

The IPO market is not cooperating unconditionally. Global IPO volume in Q1 2026 came in at 232 deals, down from 300 in the same period of 2025, according to EY data. The pace recovered over the course of 2025 — full-year volume reached 1,331 — but the early-2026 slowdown reflects ongoing uncertainty around rates, geopolitics, and tech valuations.

Anthropicis betting its growth metrics are strong enough to cut through that noise. SpaceX is also preparing a listing that could raise more than $75 billion at a valuation between $1.75 and $2 trillion, which means the high-profile IPO pipeline is crowded. Investor appetite will be tested across multiple mega-deals in a compressed window.

What Operators Should Watch

For enterprise buyers currently on Anthropic contracts or evaluating Claude for production workloads, a public listing changes the incentive structure. Public companies face quarterly earnings pressure, which can accelerate pricing changes, shift product roadmap priorities toward revenue-generating features, and alter the calculus on long-term enterprise commitments. The confidential filing is the starting gun — the terms that follow will matter more than the valuation.

Key takeaways

Anthropic filed a confidential draft S-1 with the SEC, giving it the option to go public once the agency completes its review.
The company's valuation stands at $965 billion after a $65 billion Series H round — ahead of OpenAI's reported $852 billion valuation.
Revenue run rate has grown from $10 billion to $47 billion year-over-year, a figure Anthropic is using to signal commercial scale ahead of the offering.
Anthropic's filing beats OpenAI to the public markets, reversing the first-mover dynamic that has favored OpenAI since ChatGPT's 2022 launch.
The broader IPO market is cooling — global Q1 2026 IPOs fell to 232 from 300 in Q1 2025 — making Anthropic's timing a calculated bet on its own momentum.

FAQ

What does a confidential S-1 filing mean for Anthropic's IPO timeline?

A confidential filing allows Anthropic to begin the SEC review process without publicly committing to a listing date. The company can proceed to a public offering once the SEC completes its review, or it can delay or withdraw based on market conditions. No timeline has been announced.

How does Anthropic's valuation compare to OpenAI's?

Anthropic's current valuation stands at $965 billion following its Series H round. OpenAI's most recently reported valuation was $852 billion, putting Anthropic nominally ahead in the private-market valuation race.

What is Anthropic's revenue run rate, and why does it matter for the IPO?

Anthropic reported a revenue run rate of $47 billion, up from $10 billion the prior year. That growth rate is the primary commercial proof point the company will use to justify its valuation to public market investors.

Does the IPO affect existing enterprise customers using Claude?

Not immediately, but public company status introduces earnings pressure that can influence pricing, product priorities, and contract terms over time. Enterprise buyers with significant Claude deployments should monitor how Anthropic's go-to-market strategy evolves post-listing.

Is OpenAI also planning an IPO?

OpenAI has been reported to be planning a public offering in 2026, but has not filed. Anthropic's confidential S-1 gives it a procedural head start in the public markets race between the two companies.

Citations

Anthropic IPO: Stock listing date nears as Claude AI maker gears up for one of the year's most anticipated IPOsAnthropic has confidentially filed a draft registration statement on Form S-1 with the SEC and disclosed a revenue run rate of $47 billion.
Anthropic confidential S-1 filing announcementAnthropic's valuation reached $965 billion following a $65 billion Series H funding round.
EY Global IPO Trends Q1 2026Global IPO volume in Q1 2026 totaled 232 deals, down from 300 in Q1 2025, according to EY data cited in Fast Company reporting.