Anthropic files confidential IPO prospectus with SEC, joining OpenAI and SpaceX on IPO roadmap

Anthropic, the artificial intelligence company behind the Claude family of models, has confidentially submitted a draft registration statement on Form S-1 to the US Securities and Exchange Commission, giving it the option to go public once the SEC completes its review.

The move places Anthropic alongside OpenAI and SpaceX as major technology companies that have signalled intentions to list publicly, marking a pivotal moment for the AI sector.

Anthropic, PBC filed the draft S-1 for a proposed initial public offering of its common stock on June 1, 2026. A confidential filing is a standard regulatory mechanism that allows companies to initiate the IPO process while keeping financial disclosures private until a later stage.

The number of shares to be offered and the price range have not yet been determined, and the proposed offering will ultimately depend on market conditions and other factors.

The company clarified that the announcement does not constitute an offer to sell securities or a solicitation of an offer to buy them, and that any such transactions will only occur in accordance with the registration requirements of the Securities Act of 1933.

The IPO filing comes just days after Anthropic disclosed a landmark private fundraising round. The company raised $65 billion in Series H funding, led by Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital, at a post-money valuation of $965 billion, which placed it within striking distance of a $1 trillion valuation before it has even listed publicly.

Anthropic's run-rate revenue crossed $47 billion earlier in May 2026, with the company reporting continued growth in adoption across global enterprise customers since its Series G round in February.

The Series H round also included co-leads from Capital Group, Coatue, D1 Capital Partners, GIC, ICONIQ, and XN, alongside a broad roster of significant investors including Blackstone, Fidelity, General Catalyst, Temasek, T. Rowe Price, and others. The round incorporated $15 billion of previously committed investments from hyperscalers, including $5 billion from Amazon.

Alongside the fundraising, Anthropic disclosed major compute expansion agreements. The company signed deals 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 across Colossus 1 and Colossus 2.

Claude is now available on all three of the world's largest cloud platforms — Amazon Web Services, Google Cloud, and Microsoft Azure — with AWS serving as its primary cloud and training partner.

Anthropic's CFO Krishna Rao said the Series H funding is expected to advance safety and interpretability research, expand compute to meet growing demand, and scale the company's products and partnerships.

The confidential S-1 submission initiates a regulatory review period, after which Anthropic can elect to proceed with a public offering. The timeline for any actual listing remains subject to SEC review and prevailing market conditions. If it does go public, Anthropic would become one of the most valuable companies ever to debut on public markets.