Anthropic Files Confidential IPO Prospectus, Signaling a New Chapter in AI

On June 1, Anthropic filed a confidential Form S-1 with the SEC to seek approval for a public offering of its common stock. The filing omits share count, price range, and timing, noting that the IPO “will depend on market conditions and other factors.” Confidential filing lets the company work with regulators before public disclosure.

Anthropic files confidentially for IPO at $965B valuation

The filing follows a $65 billion Series H round that raised Anthropic’s post-money valuation to $965 billion, overtaking OpenAI’s $852 billion. The round was co-led by Altimeter Capital, Dragoneer, Greenoaks, Sequoia Capital and others. Anthropic now reports a $47 billion annualized revenue run-rate, up from $10 billion a year earlier.

Anthropic confidentially files for US IPO after reaching $965Bn valuation in a recent funding round

CEO Dario Amodei, a former OpenAI executive, leads Anthropic. CFO Krishna Rao highlighted the revenue surge. Investors include Blackstone, Brookfield, D1 Capital Partners, GIC, General Catalyst, Insight Partners and cloud partner Amazon Web Services, which supplies over $100 billion in compute capacity.

Anthropic confidentially files for US IPO after reaching $965Bn valuation in a recent funding round

If priced near its private valuation, Anthropic could join the S&P 500’s top tier and rank among the world’s most valuable public firms. Analysts say three AI-centric listings—Anthropic, OpenAI and SpaceX—will test investor appetite for frontier-AI models and could reshape benchmark indexes. The filing arrives amid a broader AI IPO surge.

AI giant Anthropic files confidential IPO, signaling major Wall Street debutReutersKFSN - ABC30 Fresno NewsAnthropic Files Confidential IPO Papers After Huge Funding RoundAnthropic Files Confidential IPO

Anthropic indicated that the confidential filing gives it flexibility to pursue a public offering after SEC review, with market conditions influencing timing. OpenAI CEO Sam Altman told CNBC the company will go public “when it makes sense,” emphasizing that a listing is a financing event rather than a timing priority. The Pentagon, citing national-security concerns, ordered agencies to halt Anthropic contracts, canceling over $200 million in federal work.

Claude Maker Anthropic Takes First Step Toward Historic US IPO

Defense Secretary Pete Hegseth labeled Anthropic “a supply chain risk to national security.” Analysts also warn that the company’s heavy cloud spend and rapid valuation rise may outpace profitability, raising doubts about the sustainability of its business model.

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• “This gives us the option to go public after the SEC completes its review.” — Anthropic statement

Claude Maker Anthropic Takes First Step Toward Historic US IPO

• “We believe this represents an opening of the floodgates for the IPO market, which has been relatively dormant for a few years, with these three major conglomerates set to go public later this year, but this has turned into a race to reach public markets over the coming months,” — Wedbush Securities analysts

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• “Filing shortly after SpaceX allows Anthropic to capitalize on strong investor interest in AI and growth stocks while the window remains favorable,” — Kat Liu, IPOX vice president

Reuters

• “I think there is a race to deliver the best technology, build the best business, but you know, going public is a financing event, and I don’t think that’s one that we’re focused on the timing of,” — Sam Altman, OpenAI CEO

CNN

• “For OpenAI, the conventional read is that Anthropic just seized the narrative advantage by filing first,” — Harrison Rolfes, senior analyst, PitchBook

Reuters

Anthropic must clear the SEC review, set share price and size, and gauge market sentiment before a roadshow. Analysts say the filing will influence OpenAI’s prospectus and shape investor appetite ahead of SpaceX’s summer IPO.

CNBC