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Anthropic confidentially submits Form S-1 to the SEC for proposed IPO

· by Pondero Newsdesk

The short version

Anthropic PBC filed a confidential draft S-1 with the US Securities and Exchange Commission on June 1, 2026, ten days after disclosing a $65 billion Series H round at a $965 billion post-money valuation.

Anthropic confidentially submits Form S-1 to the SEC for proposed IPO

Four days after closing a $65 billion funding round, Anthropic PBC filed a confidential draft Form S-1 registration statement with the US Securities and Exchange Commission. The company posted a brief announcement on June 1, 2026, the same day it submitted the filing.

What

Per the Anthropic announcement, the submission was made under Rule 135 of the Securities Act of 1933. That rule permits a company to disclose that it has filed a draft registration statement without the announcement itself constituting an offer to sell. No share count, pricing range, or offering size has been set. An IPO can only proceed once the SEC completes its review, and "market conditions and other factors" will determine whether the offering actually goes forward, the announcement notes.

Anthropic's Series H, disclosed May 28, raised $65 billion at a $965 billion post-money valuation, per the company's own announcement. Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital led the round. Another $15 billion came from hyperscalers, with Amazon alone contributing $5 billion. The same announcement stated that Anthropic's run-rate revenue crossed $47 billion earlier in May 2026, a self-reported figure that has not been independently audited.

Why it matters

A confidential filing keeps Anthropic's financials private for now. The company gets to work through accounting treatment, disclosure structure, and SEC staff comments before any of that appears in a public document. Until a public S-1 amendment is filed, investors and enterprise buyers have no official view of revenue concentration, margin profile, or compute costs.

That public filing is where the real disclosures begin. Revenue split across Claude API, consumer subscriptions, and enterprise seat licenses will need to appear there. So will the path to profitability, if one exists in the near term. Those details will set the first audited comparables for frontier AI company economics at scale.

OpenAI filed its own confidential S-1 on June 8, a week after Anthropic, placing both companies in the public-markets pipeline at the same time. For buyers holding long-term Claude contracts or planning vendor consolidations, the governance picture shifts once a company carries public-company disclosure obligations. Quarterly SEC filings, material-event requirements, and audited earnings introduce accountability structures that private companies have historically been able to sidestep.

Context

Anthropic's compute footprint underlies much of the Series H framing. The Series H announcement cited agreements with Amazon for up to five gigawatts of new capacity, with Google and Broadcom for five gigawatts of next-generation TPU capacity, and with SpaceX for access to GPU capacity at Colossus 1 and Colossus 2. AWS remains the primary training partner. Infrastructure investors Micron, Samsung, and SK hynix joined as strategic partners in the same round, alongside a wide institutional list that includes Blackstone, Temasek, D1 Capital Partners, and Fidelity Management and Research Company.

What to watch next

No fixed timeline governs the SEC review. Once Anthropic files a public S-1 amendment, a roadshow cannot start until at least 15 days later. Pricing typically follows within days of the roadshow close. Whether OpenAI completes its own listing first will affect how institutional allocators benchmark the two companies against each other. Both filings are confidential for now; neither company has disclosed audited revenue.

Sources