Anthropic publicly files S-1, set to list on Nasdaq as early as the week of November 16

Anthropic has officially publicly filed its S-1 registration statement and plans to list on Nasdaq as early as the week of November 16. According to The Wall Street Journal and Reuters, the company has not yet announced its first trading day, but before shares begin trading, executives and underwriters must complete an investor roadshow, set the offering price, and obtain final regulatory approval. If all goes smoothly, this will not only be the most closely watched tech IPO of the year, but will also become one of the largest IPOs in the history of human finance.

From the public filing to the listing, Anthropic faces a race against the calendar and the rules.

Under SEC rules, a minimum of 15 calendar days must pass after a public filing before a formal roadshow can begin, which means the roadshow could start as early as Tuesday, November 10. Following the fastest path permitted by the SEC, Anthropic could begin trading as early as Monday, November 16. If one follows the listing pace of SpaceX in June this year—public filing on May 20, first day of trading on June 12, a total of 23 days—Anthropic's first trading day could fall on Wednesday, November 18. Both scenarios would come before Thanksgiving on November 26.

But the word "earliest" conceals too many variables that need to be unpacked one by one. On November 11, the SEC is closed for Veterans Day, and the SEC must give two business days' notice before declaring a filing effective. This means Anthropic cannot price until Friday, November 13 at the earliest. Bankers are usually reluctant to price on a Friday, because the stock would not trade until the following Monday, and investors would have to bear two days of overnight risk. The midterm elections ended on November 3, Thanksgiving is on November 26, and the actual buffer left for Anthropic and its underwriters is only about a week. A delay at any stage—roadshow, pricing, or listing—could push the deal into the holiday vacuum: investment banks will not launch an IPO that could set a record during Thanksgiving week, because institutional investors' trading desks are half-staffed during those days and liquidity is thin.

Two Sets of Numbers in an S-1 Filing

The timetable is a technical matter. What truly determines whether this IPO can land at the expected valuation is the numbers in the prospectus.

The first set of numbers is growth. For the first nine months of 2026, ended September 30, Anthropic's revenue was $33.2 billion, up 1,206% year over year. The enterprise API business is the main source of revenue, and Claude's penetration among enterprise customers continues to rise. At the operating level, the operating loss in the third quarter of 2026 was $567 million, narrowing by 81.6% from the same period last year; adjusted operating profit for the same period was $2.463 billion, compared with a loss of $1.284 billion in the same period last year. However, due to changes in the fair value of financial instruments such as convertible notes, derivative liabilities, and SAFEs, the net loss for the first nine months of 2026 widened to $104 billion, up from $25.1 billion in the same period of 2025. In a context where the AI industry is routinely asked "when will it make money," the simultaneous appearance of 1,206% growth and a narrowing operating loss is the strongest material for underwriters during the roadshow; but the widening net loss also reminds investors that book losses and operating losses need to be viewed separately.

The second set of numbers is commitments. The S-1 filing discloses that Anthropic's total commitments for compute and infrastructure spending amount to as much as $895.4 billion, of which $69.8 billion will be paid within the next 12 months. Placed in the same document, these two numbers constitute the core tension of this IPO: $33.2 billion in revenue for the first nine months, against a short-term bill of $69.8 billion, and nearly $900 billion in long-term commitments. Revenue is growing, but the bills are coming due at a faster pace.

This is not a gap that can be bridged by operating cash flow. IPO proceeds, subsequent follow-on offerings, debt issuance—these capital market tools are the precondition for keeping the compute contract chain turning. The S-1 filing itself also candidly lists risk factors, including "the inability to obtain sufficient compute to run AI systems" and "uncontrolled AI could pose an existential threat to humanity." The wording of the latter risk factor is unusual in a prospectus; it reflects Anthropic's consistent safety narrative, but in the IPO context it is also a reminder: the industry this company operates in has long-term risks that have not disappeared because of short-term revenue growth.

November 16: A Touchstone for the Public Pricing of AI Assets

Anthropic's IPO timetable is not an isolated listing exercise. It is the last key node in the public-market pricing of AI assets in 2026.

Over the past few months, AI-related assets have undergone a systemic repricing across both the public and private markets. On November 5, the Nasdaq Composite fell 5.52% in a single day, the Philadelphia Semiconductor Index plunged more than 12%, and the combined market value of tech stocks evaporated by roughly $2.5 trillion in one day. The private market tightened in tandem: OpenAI's latest funding round saw its target cut from $30 billion to about $20 billion, its valuation target lowered from $1.4 trillion to $1.25 trillion, and only $11 billion in first-tranche capital actually received. The market's patience with AI assets is shifting from "willing to pay for how far the story goes" to "willing to pay for how fast it converges."

Anthropic's IPO is the first genuine public-market test in this shift in pricing. OpenAI is expected to list in 2027 and is still raising in the private market; Anthropic's choice to enter the public market in November 2026 means it will become the first large AI lab to face quarterly scrutiny. Its pricing, first-day performance, and share-price trajectory in its first quarter after listing will directly set a reference anchor for OpenAI and the entire AI sector.

If Anthropic lists smoothly at its expected valuation and does not break its offer price on the first day, it will prove that the public market is still willing to fund an AI company with rapid revenue growth but nearly $900 billion in committed spending. If pricing is cold, or if the stock quickly falls below its offer price after listing, then OpenAI's path to listing will have to be replanned—not a question of "when to list," but of "at what price, in what window, and whether it can list at all."

This time window carries another easily overlooked constraint: the midterm elections have just ended. The election results of November 3 changed Washington's political landscape, and the approval environment for data center construction, AI regulation, and compute infrastructure may all shift accordingly. Anthropic's S-1 was filed before the election, and its roadshow takes place after the election; institutional investors will factor these political variables into pricing. The longer the roadshow, the more fully the variables are digested—but the shorter the window. This is a dilemma.

Who Is Buying, Who Is Selling

Before discussing pricing, it is necessary to see clearly the interest structure behind this IPO.

The S-1 shows that Amazon and Alphabet are Anthropic's two largest external backers. Amazon previously invested billions of dollars in Anthropic in exchange for the latter's commitment to spend more than $100 billion on AWS over ten years; Google both invests in Anthropic and provides it with TPU compute support. In Anthropic's IPO, these two companies are simultaneously shareholders, suppliers, and distribution channels. In the private market, this multiplicity of roles can be absorbed by the growth narrative, but under the public market's quarterly scrutiny, each layer of the relationship will be priced separately.

Venture investors Spark Capital, Menlo Ventures, Coatue Management, and Lightspeed Venture Partners, as well as funds managed by Fidelity and Blackstone, will also reap substantial paper gains from the IPO. But realizing those gains depends on the share price after the lock-up period ends, not on the first-day listing price.

One noteworthy detail: before the IPO, some shareholders had already cashed out part of their holdings. In April of this year, Anthropic facilitated a tender offer in which shareholders including CEO Dario Amodei, President Daniela Amodei, and other executives sold about $4.66 billion in stock (other reports put the figure at nearly $5 billion). Executives cashing out before an IPO is not rare in Silicon Valley, but at a company with nearly $900 billion in committed spending that has yet to achieve sustained profitability, this signal will be carefully read by public-market investors. It does not necessarily mean executives lack confidence in the company's prospects, but it does mean that some insiders chose to lock in part of their gains before the public market set a price.

The Historical Pattern of First-Day Buying

For ordinary investors, the most direct question is: should you buy on the first day of trading?

Statistics from Jay Ritter, a professor at the University of Florida, offer a reference: among more than 9,000 IPO companies between 1975 and 2021, if you bought at the first-day closing price and held for three years, 60% of the companies' share prices were flat or down. This pattern does not distinguish by industry or by company quality; it reflects a structural feature of the IPO pricing mechanism itself—underwriters tend to engineer a modest first-day gain to reward the institutional investors who subscribed, and the first-day closing price often already includes this premium.

Anthropic may, like SpaceX, receive an early boost from forced buying by passive index funds. If Anthropic's market value is large enough, it could be added to the Nasdaq 100 or other major indices shortly after listing, and passive funds would be forced to buy on specific dates, creating short-term demand. But such buying can also come at a cost: SpaceX's stock fell 15% in its first week after joining the Nasdaq 100. Passive buying pushing prices up before the inclusion date and withdrawing support after it is a common pattern with index inclusion.

For a company with $33.2 billion in revenue, narrowing operating losses in a single quarter but widening net losses due to changes in the fair value of financial instruments, the first-day IPO price is not the endpoint but the starting point. The real pricing happens in the first earnings season after listing, when institutional investors have the chance to test every assumption in the prospectus against actual quarterly data.

The True Meaning of the Countdown

Anthropic's IPO countdown is not just days on a calendar. It is a public experiment in the public-market pricing of AI assets, and the outcome will determine the terms on which OpenAI, xAI, and a batch of AI companies waiting to list enter the public market over the next twelve months.

November 16 is one possible date; November 18 is another. Both dates fall before Thanksgiving, and both are wedged into the gaps between SEC holidays and pricing rules. Underwriters will decide in the coming days when to launch the roadshow, and executives will answer institutional investors' questions during the roadshow about the $895.4 billion in commitments, customer concentration, and the dual roles of Amazon and Google. The final price will be set the night before the stock begins trading, and that price will be a comprehensive vote on all of Anthropic's growth and all of its commitments over the past five years.

The $33.2 billion in revenue is real, the 1,206% growth rate is real, and the narrowing of operating losses in a single quarter is real. The $895.4 billion in commitments is real, the $69.8 billion in short-term bills is real, and executives cashing out about $4.66 billion before the IPO (other reports put it at nearly $5 billion) is also real. The public market will not deny any of these figures; it merely requires that between these two sets of numbers there be a convergence path that can be verified by quarterly data.

On November 16, or November 18, Anthropic will walk into the public market carrying these two sets of numbers. Once the countdown bell rings, pricing power no longer belongs to the underwriters and the founders. It belongs to every investor who places an order on the first day of trading, and to every fund manager who reassesses positions after earnings season. And that is when the real beginning comes.

This article is from the WeChat public account "Tech Business," by Zisen and Haiyi, published by 36Kr with authorization.