Inside Anthropic＇s IPO Filing: Huge Growth and ＇Catastrophic＇ Risk－By Nate Wolf,BARRON＇S

You can find the full S-1 IPO registration statement here. Fair warning: It is 318 pages.

Anthropic will be the public market’s first pure-play developer of advanced AI models, and its prospectus makes the case that a bet on Anthropic is a bet on AI itself. Anthropic claims its “self-reinforcing loops” will create durable competitive advantages.

“Revenue from expanding enterprise adoption helps us to fund the compute, research, and talent needed to improve Claude. Claude’s advancing capabilities expand theE range of tasks and workflows customers use Claude for, broadening our addressable market and driving deeper deployment, additional revenue, and continued reinvestment in Claude,” the company said in its prospectus.

Betting on Anthropic has paid off handsomely for private investors, but the company is going public at a tenuous time for the AI trade. Already, Wall Street’s target for Anthropic’s valuation has come down to $1.5 trillion from $2 trillion, per Reuters.

Investors will now dig through the prospectus to get a clearer picture of Anthropic’s worth. The company’s bankers, led by Goldman Sachs and Morgan Stanley , will try to gin up demand and price the offering.

Here are a few things to know as that process unfolds.

Explosive Growth, But Is It Enough?

Anthropic raked in $16.3 billion over the first half of 2026, up from $1.2 billion in the same period last year.

As expected , the company’s growth decelerated in the third quarter. Revenue rose 45% quarter-over-quarter to $16.8 billion in the period ending Sept. 30, down from a triple-digit percentage jump the prior quarter, The Wall Street Journal reported last week. That slowdown may give some investors pause.

An additional point of concern: Anthropic’s top five customers represented about one-quarter of its revenue for the nine months ended Sept. 30, 2026. Many of the company’s top customers aren’t subject to long-term contracts.

That said, we are still dealing with an unprecedented pace of growth for such a large company.

A Nascent Profit

AI development is expensive, but Anthropic has managed to eke out an operating profit just a few years since launching its Claude family of AI models.

The company lost $80.7 billion in the six months ended June 30. About $72 billion came from accounting charges tied to various financing instruments. On an adjusted operating basis, however, the company made $1.6 billion. That number excludes stock-based compensation, noncash charitable contributions, and a $1.5 billion litigation charge. The company also reported a positive operating cash flow of $3.9 billion over those six months.

There is a nearly $800 billion elephant in the room, though. Anthropic has commitments to spend about $630 billion on data-center capacity and chip leases over the next 10 years, and it is potentially on the hook for $145 billion to $170 billion more.

A big capital raise from the IPO and continued free cash flow would go a long way toward ensuring Anthropic can pay those bills. What may help, too, according to Anthropic, is that its compute costs are falling while its revenue increases.

‘Catastrophic’ Risks

Anthropic has been perhaps the most vocal company when it comes to both the benefits and risks of AI. CEO Dario Amodei dreams of curing cancer and powering 20% annual GDP growth. On the flip side, he has declined to rule out the possibility of AI development ending in human extinction.

The prospectus doesn’t go quite that far, but it comes close. The 94-page Risk Factors section is a doozy.

“As AI systems become more capable, the potential severity of harm from misaligned or misused models increases correspondingly, and a wide range of stakeholders, including researchers and policymakers, have raised concerns that sufficiently advanced AI systems could pose catastrophic or existential risks to society if not developed and deployed responsibly,” the company explained.

Some analysts believe Anthropic is just trying to encourage regulations that out its competitors. But as Barron’s argued last month, Amodei isn’t a typical cutthroat CEO. He has expressed deep, nigh-apocalyptic concerns about AI for years.

Public markets aren’t accustomed to dealing with management teams that think their products may destroy the world.

The Competition

Analysts and investors Barron’s has spoken to have been curious what Anthropic has to say about competition from open-weight models, which anyone can download and run on their own hardware. They are typically cheaper than Anthropic’s proprietary models, which require its app or web-based service.

Anthropic acknowledges that open-weight models are a threat to its own pricing power.

“Open-weight or open-source AI models may capture a portion of the market for certain use cases, which could exert pricing pressure on our offerings or lead certain customers to adopt open-source alternatives for those use cases,” the company said.

Its solution is to build models with the strongest performance and reliability in the industry.

“We must continuously invest in research and development to maintain our competitive position, but there is no guarantee that our investments will result in models, platforms, and applications that customers prefer over competing alternatives,” Anthropic added.

What Comes Next?

Anthropic hasn’t revealed how many shares it will make available. At an anticipated valuation of $1.5 trillion, the company would raise some $300 billion less than SpaceX raised through its June IPO. However, the company’s fund-raising efforts are unlikely to end there.

Ratings agencies will be busy at work grading Anthropic’s credit. If the company achieves investment-grade status, expect it to pursue a massive bond offering not long after the IPO, says Jordan Chalfin, head of technology at CreditSights.

SpaceX, for instance, raised $25 billion in a debt offering within weeks of going public.

Ratings agencies will take kindly to Anthropic’s $132 billion in cash on hand as of June 30—a number that will rise after the IPO. They will also like the company’s massive scale and positive adjusted operating cash flow. But the agencies will have to grapple with all the same risks that equity investors are assessing.

“There’s not a whole lot of operating history here,” Chalfin says of Anthropic, adding that AI development is an “intensely competitive space.”