Anthropic IPO: What the Filing Shows Behind the $80B Loss

Last updated October 26, 2026. By Stock Moe, former financial advisor, MBA and finance teacher.

The Anthropic IPO is officially in motion. Anthropic, the company behind Claude, publicly filed its Form S-1 with the SEC on October 26, 2026 to list Class A shares on the Nasdaq Global Select Market under the ticker ANT. The headline number is an $80.7 billion net loss for the first six months of 2026, but $72.4 billion of that is a non cash change in the value of convertible notes and similar instruments, and the actual operating loss was $693 million on $16.3 billion of revenue.

I made a full video on this one, and in this article I walk through the same five checks I run on any giant IPO, using the numbers straight from the filing. I also show you what happened to everyone who bought the last record IPO, SpaceX, at three different prices, because that is the part that should shape your plan.

• When is the Anthropic IPO?
• Check 1: Is the $80 billion loss real?
• Check 2: How fast is revenue growing?
• Check 3: What did they promise to pay?
• Check 4: Who holds the leverage?
• Check 5: What are you paying for the revenue?
• What the SpaceX IPO teaches
• My plan for the Anthropic IPO
• Common questions

In the video I go through each check on screen. Here are the key points in text, with every number checked against the S-1 itself. A few numbers in the video came from earlier press reports on a draft filing, and where the final public filing says something different, I use the filing and tell you.

When is the Anthropic IPO and what is the ticker?

Anthropic announced on its own news page that it filed the registration statement on October 26, 2026, that the shares will trade as ANT on the Nasdaq Global Select Market, and that the number of shares and the price range have not been determined. Goldman Sachs and Morgan Stanley are the banks named for copies of the preliminary prospectus. The registration is not effective yet, so no shares can be sold until the SEC signs off and the deal prices.

On timing, the Wall Street Journal reported that Anthropic is targeting a listing the week of November 16, at a valuation that could land between $1.5 trillion and $2 trillion, according to Investing.com’s summary of that report on October 26. Treat both as reported, not confirmed. The price range will show up in an amended filing, and that is the moment the valuation becomes a real number.

One structural detail worth knowing before you buy: Class A shares get one vote each, while Class N shares, held mostly by strategic partners, carry no vote. Anthropic is also a public benefit corporation with a Long Term Benefit Trust meant to keep the company tied to its stated mission. That is unusual for a company this size, and it means outside shareholders will not have the kind of say they would at a normal tech company.

Check 1: Is the $80 billion Anthropic loss real money?

This is the first check I run on any IPO: is the loss money leaving the building, or is it accounting? The line that settles it is the cash flow statement, not the net loss.

Here is what the S-1 shows for the six months ended June 30, 2026. Revenue of $16,286 million. Total operating expenses of $16,979 million. That is an operating loss of $693 million. Then comes a $72,388 million charge for the change in fair value of convertible notes, derivative liabilities and SAFEs, plus an $8,757 million other expense that the filing ties to the fair value of assets and liabilities under its note purchase agreements. Add it up and you get the $80.7 billion net loss.

Those fair value charges happen when the instruments a company issued to raise money privately become worth a lot more because the company itself became worth a lot more. No cash moved. And the cash flow statement proves it: net cash from operating activities was a positive $3,929 million in the first half of 2026, compared with negative $1,513 million a year earlier.

So the scary headline is mostly the cost of success on paper. That does not mean the business is cheap to run. Compute and infrastructure alone cost $8.9 billion in six months, and stock based compensation was $2.2 billion. But “lost $80 billion” and “burned $80 billion” are two very different statements, and only one of them is true.

Check 2: How fast is Anthropic revenue growing?

The growth is the reason this IPO is so big. Revenue went from $41 million in 2023 to $386 million in 2024 to $4,585 million in 2025. Then the first six months of 2026 alone brought in $16,286 million, which is more than three times all of 2025.

The customer base backs it up. As of September 30, 2026, the filing counts more than 11,900 customers paying $100,000 or more over the trailing twelve months and more than 1,900 paying $1 million or more. A year earlier the $100,000 group was a little over 950.

Two questions decide what that growth is worth. First, how is revenue counted? When Anthropic sells Claude through cloud partners, the S-1 says it books revenue on a gross basis because it is the principal in those deals. That is allowed, but it makes the top line bigger than a net presentation would, so compare it carefully with companies that report net. Second, is it sticky? The filing says many top customers are not on long term contracts and can reduce or stop spending at any time.

Check 3: What did Anthropic promise to pay?

If you forget everything else, remember this one. Find the commitments table, because that is what can sink a company when growth slows. A company can cut ad spending in a bad quarter. It cannot cut a contract that says pay us anyway.

The S-1 spells out two big ones. Anthropic committed to spend at least about $114.5 billion with Google between April 2026 and July 2033, regardless of actual usage, and at least $110.0 billion with Amazon between May 2026 and April 2036, also regardless of usage. If spending falls short, it pays the difference. On top of that, after June 30 the company signed new and amended agreements with future minimum payments of about $245 billion, mostly compute and infrastructure, plus about $21 billion in short term commitments.

Now put that next to Check 2. Anthropic is locked into paying for compute for up to a decade. Many of its customers are not locked into paying Anthropic. That mismatch is the real risk in this IPO, far more than the accounting loss.

The cushion is real, though. As of June 30, 2026, the filing shows $112.4 billion of cash and cash equivalents plus $19.3 billion of short term investments, before a single IPO share is sold.

Check 4: Who actually holds the leverage?

The companies selling Anthropic its compute, Google and Amazon among them, also build competing AI models. The risk factors say it plainly: if compute access is “curtailed, repriced, or terminated,” results could be hurt. Google and Amazon are also investors, which cuts both ways.

On customers, the filing says no single customer was more than 10% of revenue for the nine months ended September 30, 2026, and the top five together were about 25%. In the video I quoted a press report that two customers made up about a fifth of revenue. The public filing frames it as the top five at about a quarter, so go with the filing. Either way, a big slice of revenue sits with a handful of buyers.

Check 5: What are you paying for Anthropic revenue?

There is no price yet, so here is the math at the reported range. Six months of revenue at $16.3 billion annualizes to about $32.6 billion. At a $1.5 trillion valuation that is about 46 times sales. At $2 trillion it is about 61 times. In the video I used a forward revenue estimate, which gives a lower multiple. Using only what the company has actually reported, it is expensive.

For comparison, SpaceX is the closest recent mega listing, and it trades at a rich multiple too. A high multiple only works if the growth keeps coming at this pace for years. That is the bet you are making, and the commitments in Check 3 are what happens if it does not.

What the SpaceX IPO teaches about buying the Anthropic IPO

I covered the SpaceX earnings and the 1.3 billion share unlock last week, and the price history is the best lesson I have for this deal. SpaceX priced its IPO at $135 a share and started trading June 12, 2026, opening at $150, per Pulse 2.0 and Webull price data. Two trading days later, on June 16, it hit $225.64, up 67% from the offer. On August 3 it touched $104.83, below the offer price. It closed at $147.49 on October 23.

Same company, three buyers. The one who got the offer at $135 is up about 9%. The one who chased the high at $225.64 is down about 35%. The one who bought the August panic at $104.83 is up about 41%. Same business, same five checks. Only the price was different.

That is also why the lockup matters. The S-1 says existing holders agreed not to sell for 180 days after the prospectus date. When that window opens, supply jumps. I explained exactly how that played out in my SpaceX lockup expiration breakdown.

My plan for the Anthropic IPO

Here is how I am approaching it, and this is my opinion, not advice. I want in through the IPO if I can get it. I like the first two days of a hyped listing, like we had with SpaceX, where I rode it up and sold at $208. Then I step aside and wait to see if it trades back under the IPO price, which SpaceX did within two months.

• If you want in: let it trade first and watch where it settles after the opening frenzy.
• If you buy anyway: size it so you can be wrong. A position you can hold through a 35% drop beats one you panic out of.
• If you are watching: write the five checks down now, then compare them with the final prospectus when the price range is set.

Ready for the listing day? Once ANT starts trading you can buy whole or fractional shares at a regular brokerage. I place my own trades on Webull. Open a Webull account through my link (affiliate link, I get paid if you sign up). Any new account offer is subject to Webull’s current terms and eligibility, so check the offer page for the current terms before you deposit. Investing can lose money, and a brand new IPO can swing hard in both directions.

Common questions about the Anthropic IPO

Keep reading on Stock Moe

• SpaceX Earnings: $4.4B Profit and the 1.3B Share Unlock
• How to Buy Fractional Shares in 2026: Step by Step
• Buffett Lennar Stake: What the 12% Filings Show (2026)

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Sources

• Anthropic, PBC, Form S-1 registration statement, SEC EDGAR, filed October 26, 2026
• Anthropic, Anthropic files S-1 with the SEC for proposed initial public offering, October 26, 2026
• Investing.com, Anthropic files for IPO, with revenue surging and potential $2 trillion valuation, October 26, 2026 (summarizing Wall Street Journal reporting)
• Pulse 2.0, SpaceX: $75 Billion IPO Priced At $135 Per Share, June 12, 2026
• SpaceX (SPCX) daily prices, June 12 to October 23, 2026, Webull market data, accessed October 26, 2026

I am not a financial advisor and nothing in this article is financial advice. Everything here is my own opinion, for educational and entertainment purposes only. Do your own research and talk to a licensed professional before you make any financial decision.