Anthropic's IPO Filing Shows a $17B Quarter and an $895B Compute Bill

The numbers that will dominate the roadshow

Anthropic has given Wall Street its clearest look yet at the business behind Claude. In an amended Form S-1 filed with the SEC on Monday, November 2, the company reported third-quarter revenue of $16.96 billion, up 47 percent from the previous quarter. For the nine months ended September 30, revenue reached $33.24 billion, roughly 1,200 percent higher than the same stretch of 2025.

Those are extraordinary numbers. They are also numbers with a problem hiding inside them. Growth is slowing fast. Revenue rose 144 percent in the second quarter and 132 percent in the first. The third quarter's 47 percent is less than a third of the second quarter's rate. Anthropic is still growing fast, but it is no longer accelerating, and for a company heading into an IPO, the direction of the growth rate matters as much as the size of the revenue.

The filing also shows the company swung back to an operating loss of $567 million in the third quarter, after posting $974 million in operating income in the second quarter, its first operating profit after at least five quarters of losses. Anthropic said the loss was primarily driven by $5 billion in additional compute costs during the quarter.

The $895 billion commitment

The number that will dominate investor conversations is not the revenue. It is the purchase commitments. Anthropic disclosed approximately $895.4 billion in purchase commitments and lease agreements, substantially all of which is related to compute and infrastructure. Roughly $448 billion of that is expected to be incurred before the end of 2030, and about $70 billion falls due in the 12 months following September 30.

Read that plainly: Anthropic has promised to spend nearly $900 billion on computing power, and it has to find the money whether or not its growth holds up. The filing's risk factors are blunt about this. These are take-or-pay style commitments in many cases, which means the bill comes due even if demand softens. That is the structural risk at the heart of the entire frontier AI business model, and Anthropic's filing puts it on paper in a way no private company has before.

The company also disclosed that it had more than 11,900 customers generating at least $100,000 in revenue on a trailing 12-month basis as of September 30, up from more than 1,500 at the end of 2025. Cash, cash equivalents, and short-term investments stood at $131.8 billion, nearly unchanged from June. Remaining performance obligations, meaning contracted revenue not yet recognized, rose to $13.8 billion from $10.8 billion.

Net loss for the quarter was $23.29 billion, down from $66.3 billion a quarter earlier. That figure includes a $21.9 billion non-cash loss tied to changes in the fair value of convertible notes and other securities, linked to Anthropic's rising valuation. Without that line, the quarter's net loss would have been about $1.4 billion. It is a reminder that headline net loss in an IPO filing can be dominated by accounting, and investors will look past it to the operating numbers.

What the filing does not settle

The amended Anthropic IPO filing is a disclosure document, not a done deal. It does not establish an offering size, a price range, a valuation at pricing, or a completion date. Reports say Anthropic is preparing to begin formally marketing shares to investors next week, and Bloomberg has reported the offering is set to happen before the US Thanksgiving holiday, but none of that is confirmed in the filing itself.

The original prospectus was made public on October 26 and ran 614 pages. The amendment adds the third-quarter numbers and updates the risk factors, including new language about the risks to the computing capacity underpinning Anthropic's expansion. Some of that capacity depends on financing beyond the company's control, which is a polite way of saying that the $895 billion plan needs lenders and partners to keep showing up.

There is also a governance question the filing leaves open. Anthropic's Long-Term Benefit Trust is designed to insulate technical decision-making from shareholder pressure, and how that trust works in practice after an IPO is something institutional investors will press on during the roadshow.

Why this filing matters beyond Anthropic

This is the most detailed financial look at a frontier AI company ever published. It shows a business growing at a pace no software company has ever sustained, spending on compute at a scale no company has ever attempted, and doing both at the same time. The tension between those two facts is the story of the AI industry right now.

The funding market has noticed. Fal raised $1.3 billion at a $16 billion valuation because running AI models has become a business in itself, and Traversal raised $120 million to build AI systems that diagnose software outages. Capital is flowing into every layer of the stack. Anthropic's filing is the first document that shows what the top of that stack actually looks like from the inside.

Whether the IPO succeeds will depend on whether investors believe the growth story or the compute bill. The roadshow will be the test. For now, the filing does what filings are supposed to do: it gives everyone the numbers, and lets the market argue about what they mean.