Anthropic confidentially files S-1 for IPO after reporting $965 billion valuation

Anthropic has submitted a confidential S‑1 to the US Securities and Exchange Commission after reporting a $965 billion post‑money valuation that surpasses OpenAI’s $852 billion, positioning the startup ahead in the race to go public.

Anthropic said Monday it submitted a confidential S‑1 registration to the US Securities and Exchange Commission, formally opening the agency’s review for a potential initial public offering. The move matters because a public filing will be the first time investors and the market can verify Anthropic’s finances and gauge whether the company’s private valuation and growth claims hold up under public scrutiny.

Because the filing was made confidentially, Anthropic provided minimal detail, declined to answer follow‑up questions and warned the proposed offering “will depend on market conditions and other factors.” The company has not set the number of shares or an offering price; those terms remain subject to change as the SEC review and market dynamics unfold. The confidential S‑1 follows a recent Series H round that Anthropic reported as $65 billion and said produced a $965 billion post‑money valuation — surpassing OpenAI’s most recently reported $852 billion valuation. Anthropic has highlighted its Claude Code product and said it generates higher revenue than its larger rival despite having a smaller user base.

The filing’s timing appears strategic: it arrived days after Anthropic announced the fresh private valuation, positioning the company ahead of OpenAI in the race to list publicly and shaping perceptions of which startup leads the sector. Some coverage has framed the submission as part of a broader valuation contest between Anthropic and teams led by Sam Altman at OpenAI.

Reporting has also raised questions about financial transparency. One report said Anthropic is on the verge of reporting a first‑quarter operating profit, but noted that private companies are not required to disclose the same level of detail as public firms and that a reported “profit” can exclude various expenses. Observers say the unsealed S‑1 will be the first verifiable look at the company’s books.

How a public prospectus will affect the wider AI market is uncertain. The S‑1 could reinforce the high private valuations that have driven sector momentum, or it could reveal strains — such as substantial operating losses alongside lofty valuations — that temper investor enthusiasm. Commentary warned that an IPO filing could echo past patterns where very high valuations coexist with outsized losses.

Practical next steps remain unclear. The SEC review timeline for a confidential S‑1 is variable, Anthropic reiterated that market conditions will be determinative, and the company has not finalized share counts or pricing. Until the registration statement is made public, engineers, customers and investors will have to rely on limited company statements and outside reporting to assess Anthropic’s fiscal position and product traction.