Anthropic confidentially files S-1, joins 2026 IPO surge

Anthropic submitted a confidential draft Form S‑1 to the U.S. Securities and Exchange Commission on June 1, 2026, under Rule 135, indicating plans to pursue an initial public offering. The filing allows the company to move toward a public listing once the SEC completes its review.

Anthropic confirmed the submission on its X account, saying the number of shares and the offering price have not been determined and that the IPO remains subject to SEC review, market conditions and other factors. In the post, the company wrote, “Pending completion of SEC review, this gives us the option to pursue an initial public offering.”

The filing follows a Series H financing announced in late May that raised $65 billion at a $965 billion post‑money valuation. Anthropic reported an annualized revenue run‑rate that recently crossed $47 billion, driven by enterprise adoption of its Claude models for coding and automated workflows.

Anthropic has active commercial arrangements with major cloud providers and has secured substantial commitments for GPUs and other compute to scale its services. Company filings and public statements note large infrastructure costs tied to model training and deployment.

Anthropic’s confidential S‑1 adds to a wave of filings from major tech companies. SpaceX filed a public S‑1 on May 20 after a confidential April submission and is targeting a June 12 Nasdaq listing under the ticker SPCX, with a proposed valuation range of $1.75 trillion to $1.8 trillion and a possible raise of up to $75 billion. OpenAI submitted a confidential filing around May 22 and is targeting a potential September 2026 debut with a valuation at or above $1 trillion.

Public listings will require more detailed disclosure of financial results, risk factors and operational obligations, including compute expenses and contractual commitments. If Anthropic completes SEC review and files a public S‑1, that document and any subsequent roadshow would set the final offer size, price and timing.

The next steps for Anthropic are completion of the SEC review and any public filing that sets terms and a timetable. The company did not provide a target date or additional financial projections in the confidential submission.