The Claude maker has submitted a confidential S-1 to the SEC, joining SpaceX and OpenAI in the most consequential wave of tech listings in a generation.
Anthropic confirmed on Monday that it has confidentially submitted a draft registration statement, known as an S-1, to the US Securities and Exchange Commission. The filing is the first formal step towards an initial public offering.
For anyone outside finance, the S-1 is the document that tells investors everything they need to know about a company before they decide whether to buy shares. Revenue, costs, risks, executive compensation, who owns what, and how the money will be spent. It is the closest thing a private company produces to a full financial confession.
Why confidential?
A confidential filing means the SEC reviews the document before the public sees it. The company gets to fix errors, answer regulatory questions and refine its disclosures without the market picking through every draft.
Once the SEC is satisfied, the S-1 goes public at least 15 days before the roadshow, the series of presentations to institutional investors that sets the final share price.
Anthropic has reportedly engaged Wilson Sonsini, the law firm that managed Google's 2004 IPO, to guide the process.
What we know about Anthropic
The company closed a $65 billion Series H funding round last week at a $965 billion post-money valuation, surpassing OpenAI's $852 billion. Its annualised revenue run rate has reached $47 billion, up from roughly $10 billion a year ago.
That growth rate is extraordinary. It is driven largely by enterprise adoption of Claude for coding and workflow automation, with Claude Code emerging as a breakout product.
The number of shares and the offering price have not been set. Anthropic said timing will depend on market conditions, with a debut as early as October cited in reports.
The IPO wave
Anthropic is not listing in isolation. SpaceX is targeting a June listing in what would rank among the largest IPOs in stock market history. OpenAI filed confidentially around 22 May and is reportedly aiming for a September debut at a valuation above $1 trillion.
Three companies with a combined anticipated market capitalisation above $3.5 trillion, all heading for public markets within months of each other. The last time the IPO calendar looked anything like this was the 2021 SPAC boom, and that ended badly for most participants.
What investors should watch
The S-1, when it goes public, will be the first time anyone outside Anthropic's board and existing investors sees audited financial statements. Revenue growth is clear. The questions are around profitability, compute costs and customer concentration.
Anthropic has committed to paying $1.25 billion per month to use available compute capacity at SpaceX's Colossus 1 data centre in Memphis through May 2029. That is $15 billion a year in infrastructure costs alone, before salaries, research and everything else.
The revenue is real. The costs are enormous. The S-1 will reveal whether the gap between them is closing or widening, and that single number will determine whether a $965 billion valuation holds up in the public market.