On 26 October Anthropic, the company behind the Claude AI models, publicly filed for an initial public offering. It plans to list its Class A shares on the Nasdaq Global Select Market under the ticker **ANT**. If it goes ahead at the valuations being discussed, it would be one of the largest stock market debuts ever.
The filing, a Form S-1, is the first time the public gets to see inside one of the leading AI labs. And the numbers are extreme in both directions: revenue is exploding, and so are the losses.
Here is what the Anthropic IPO filing reveals.
The Anthropic IPO at a glance
- **What:** an S-1 registration statement for a proposed IPO of Class A common stock. - **Where:** Nasdaq Global Select Market, ticker **ANT**. - **Banks:** Goldman Sachs and Morgan Stanley are named for the preliminary prospectus. - **Price and size:** not set yet. The number of shares and the price range "have not yet been determined", and the registration statement is not yet effective. - **When:** reported as later this fall, possibly within weeks. - **Valuation:** the last private round, in May, valued Anthropic at $965 billion. A valuation of $1.5 to $2 trillion is reportedly under discussion for the listing.
Revenue: from $4.6 billion a year to $16.3 billion in six months
The growth is the headline. According to the S-1 figures reported by Yahoo Finance:
- **2025 revenue:** $4.6 billion for the whole year. - **First half of 2026:** $16.3 billion. - **Q1 2026:** $4.7 billion. **Q2 2026:** $11.6 billion.
In other words, Anthropic made more in the second quarter of 2026 than in all of 2025, and then some. Revenue per employee passed $6.6 million over the past year, with about 5,300 employees as of 30 September.
The $80.7 billion loss: what it means
The other headline number is the loss: **$80.7 billion in the first half of 2026**, after a $42 billion net loss in 2025.
That figure needs context. Reporting on the filing describes the bulk of it as accounting charges rather than cash spent, tied to how the company's financing is recorded. The clearer view of the business is operating income: Anthropic posted an **operating loss of $1.7 billion in Q1** and its **first operating profit, $974 million, in Q2 2026**.
So the business itself turned profitable on an operating basis in the second quarter, while the bottom line is dominated by accounting items. Investors will be reading those footnotes closely.
The real cost of AI: compute
The single biggest expense is computing power, the chips and data centres that train and run the models:
- **Compute cost in Q2 2026:** $5.6 billion, up from $3.4 billion in Q1. - **Commitments:** up to $120.5 billion to SpaceXAI computing arrangements running into 2029, around $3.1 billion a month once the capacity is delivered, expected from December 2026.
This is the part of the AI economy that worries markets. Two weeks ago the 20 largest AI and chip stocks lost more than $1 trillion in a week, partly on fears that the cost of building AI is running ahead of the money it brings in. Anthropic's filing shows both sides at once: revenue growing at a pace few companies have ever seen, and spending commitments to match.
The risk section: "catastrophic or existential"
Every IPO filing lists risks. Anthropic's is unusual. Besides the standard ones, such as "increasingly restrictive AI regulation", the filing states that AI could pose a **"catastrophic or existential risk to humanity"**.
It is not every day that a company tells the regulator, in a document meant to sell its shares, that its own product category could be dangerous on that scale. It is consistent with how Anthropic describes itself: a Public Benefit Corporation whose stated mission is "to ensure the world safely makes the transition through transformative AI".
How the market reacted
On the day of the filing, the AI trade bounced. Chip stocks such as Nvidia, Broadcom, Micron and Intel rose, and the Nasdaq Composite gained about 0.8%. After weeks of selling in AI stocks, a giant AI company asking public markets for money was read as a vote of confidence. The next test arrives fast: the Federal Reserve announces its rate decision on 28 October.
Anthropic IPO: frequently asked questions
**When is the Anthropic IPO?** No date has been set. The S-1 is filed but not yet effective, and reports point to later this fall.
**What will the Anthropic stock ticker be?** ANT, on the Nasdaq Global Select Market.
**How much is Anthropic worth?** The last private round valued it at $965 billion. A listing valuation of $1.5 to $2 trillion is reportedly under discussion. The final figure depends on the price range, which has not been set.
**Is Anthropic profitable?** On an operating basis, yes, in Q2 2026 ($974 million). On a net basis, no: the net loss for the first half of 2026 was $80.7 billion, largely accounting charges.
**Can I buy Anthropic stock now?** Not on the public market. Shares can only trade once the registration becomes effective and the IPO is priced. This article is not a recommendation to buy or sell anything.
What this means for AI and markets
The Anthropic IPO turns a private race into a public one. For the first time, anyone will be able to see, quarter by quarter, what a frontier AI lab earns and what it spends. That transparency is good for the whole industry, and it is exactly the principle we work by at NeuPortal: we run AI on real markets and publish the results in public, wins and misses alike.
**NeuPortal is building in this space.** Our team develops AI trading agents that work in the open, with every trade on screen and every forecast scored in public. We present our products to the world on 5 November. Save your spot at neuportal.ai.
Discuss the Anthropic IPO with us in the Telegram community: t.me/neuportal_community
*Not financial advice. Sources: Anthropic announcement of the S-1 filing (26 October 2026), Yahoo Finance coverage of the S-1, Anthropic's May 2026 funding announcement. Figures as reported on 26-27 October 2026.*