Anthropic IPO: what the S-1 filing means and when shares could trade

On 26 October 2026, Anthropic publicly filed an S-1 registration statement with the US Securities and Exchange Commission, the first public step towards listing on the stock market. The company says it plans to list shares on Nasdaq, a US stock exchange, under the ticker ANT. The shares are not trading yet, and the offer price, the number of shares and the first trading day have not been set.

Key takeaways

• Anthropic filed its S-1 on 26 October 2026 and plans to list on Nasdaq as ANT.
• The shares are not trading yet.
• Revenue grew fast, but Anthropic expects costs to rise and says losses will continue.

What happened on 26 October 2026

Anthropic is the company behind Claude, the AI assistant. It filed a Form S-1 with the SEC, the US market regulator. An S-1 is the document a company files before a US stock-market listing. It sets out the company’s accounts, risks and business. It is not the listing itself.

For readers in Europe, this matters for one simple reason. For the first time, the public can see Anthropic’s finances in detail. On 27 October 2026, Reuters reported that Asian markets took encouragement from the filing, while European stock futures dipped the same morning.

Anthropic leads the private-company rankings in our guide to the largest AI companies by funding valuation. Akka invested in Anthropic, and its investors later sold their shares for 4 times their money, after fees, in 15 months. Past results do not predict future results.

When could the shares trade

There is no confirmed date. The Wall Street Journal and Reuters have reported a target of the week of 16 November 2026, the earliest date SEC timing rules allow. Anthropic has not confirmed it.

Here are the five steps from filing to first trade:

1. The public S-1 is filed. Done on 26 October 2026.
2. The SEC reviews the disclosures, and the company files amended versions.
3. The company and its banks present the offer to large investors.
4. The offer price and the number of shares are set, and shares are handed out to investors.
5. Trading starts on the exchange.

One point is often misunderstood. The SEC checks that the disclosure rules are followed. It does not judge whether the shares are a good investment, and clearing the review is not an endorsement. A company can also amend its filing, delay the offer or drop it entirely.

What the numbers in the filing show

The growth is the headline. Revenue reached $16.29 billion in the first half of 2026, against $1.16 billion in the same period of 2025, the filing shows. That is roughly fourteen times as much as a year earlier.

The customer figures tell the same story. At 30 September 2026, more than 1,900 customers had spent at least $1 million with Anthropic over the previous twelve months. More than 11,900 had spent at least $100,000, up from more than 950 a year earlier.

Then come the costs. Anthropic spent $5.6 billion on computing power in the second quarter of 2026 alone, Fortune reported. Computing power means the chips and data centres needed to train and run Claude. The filing lists about $417 billion of minimum payments under compute and data-centre agreements signed or expanded since the end of 2025, plus an estimated $125 billion to $150 billion for extra capacity due between 2028 and 2031 whose terms are not yet final. Those are commitments for the years ahead, not money already spent. The named partners include Amazon, Google, Microsoft, SpaceX's AI unit (formerly xAI), Nscale and Lambda, and some contracts require payment whether the capacity is used or not.

Why a fast-growing company can post an $80 billion loss

Anthropic reported a net loss of $80.7 billion for the first half of 2026, against $13.0 billion a year earlier. The number looks enormous next to $16.29 billion of revenue. Most of that reported loss came from non-cash accounting charges.

Fortune reported that about $72.4 billion of that loss came from an accounting charge, mainly reflecting the increased value of convertible notes. Convertible notes are loans that turn into shares later. When the company's valuation jumps, the value of those notes is recalculated and the difference is recorded as a loss on paper.

Even without that charge, the half-year still shows a net loss of about $8 billion, mostly from other non-operating items. At the operating level, which excludes those items, the loss was $693 million for the half, and the second quarter alone turned an operating profit of $974 million. Fortune also reported $3.9 billion of cash generated by day-to-day operations. Anthropic itself wrote in the filing: "We expect our costs will increase over time and our losses will continue."

Who keeps control after the listing

The filing shows that a single Class F share, to be held through an entity called Founder LLC, is expected to give the seven co-founders 50.1% of the voting power on general shareholder matters. A separate body, the Long-Term Benefit Trust, can elect and remove a majority of the directors through its own share class.

For someone holding the publicly traded shares, the consequence is simple. You own a slice of the economics without a matching say in the decisions.

Can individuals buy Anthropic shares

Not today. The filing does not make shares available, and Anthropic is still a private company.

• Before the listing. Private shares change hands with transfer restrictions, limited access and no guarantee you can sell when you want.
• At the offer price. Shares are allocated through the banks running the offer and the brokers they work with. Individual investors may receive no allocation, and none is guaranteed.
• After trading starts. Anyone with a broker that gives access to Nasdaq can buy at the market price, which can sit well above or below the offer price and move sharply in the first days.

Offers to sell Anthropic shares before listing can be scams.

Risks

• Anthropic says in its own filing that costs will rise and losses will continue.
• Some of Anthropic’s future compute contracts require payment even if the capacity is unused.
• The listing can still be delayed, offered at a different price or withdrawn after the filing.
• Newly listed shares can change sharply in their first weeks of trading.
• Founders will hold majority voting power after the listing, so ordinary shareholders will have limited influence.

This article is for information only and is not investment advice.

Frequently asked questions

How much could Anthropic be worth at listing?

No valuation is set in the filing. Anthropic's last announced private round, worth $65 billion on 28 May 2026, valued it at $965 billion after the money came in. Media reports have discussed a listing valuation of roughly $1.5 trillion to $2 trillion, but those are estimates. The real figure comes from the offer price multiplied by the total number of shares outstanding after the offering, and the market decides from there.

Is there a Claude IPO?

No. Claude is the product, Anthropic is the company. Buying shares would mean owning part of Anthropic, including Claude and everything else it does.

What does Claude cost today?

In October 2026, Claude Free is $0, Pro is $20 a month in the US or $17 a month with annual billing, and Max plans start at $100 a month in the US. Team Standard seats cost $25 per month or $20 per month with annual billing in the US.

Had anyone already made money on Anthropic before the filing?

Yes, through private share sales. Akka invested in Anthropic and its investors later sold their shares for 4 times their money, after fees, in 15 months. Past results do not predict future results.

What should I watch from here?

The next public milestones are amended filings, the price range, the number of shares offered, the final prospectus and the confirmed first trading day. Lock-up terms say when existing shareholders can sell.

Sources

• U.S. Securities and Exchange Commission: Anthropic PBC Form S-1 (26 October 2026)
• Anthropic: Anthropic files S-1 with the SEC for proposed initial public offering (26 October 2026)
• Reuters: Asian stocks surge as Anthropic IPO lifts sentiment ahead of earnings, central banks (27 October 2026)
• Fortune: Anthropic’s S-1 IPO prospectus shows $16.3 billion in revenue, an $80.7 billion net loss, and goal of an ‘age of miracles’ (26 October 2026)
• Yahoo Finance: Anthropic's IPO could start trading as soon as Nov. 16 (October 2026)
• TechCrunch: Anthropic raises $65 billion (28 May 2026)
• Anthropic: Claude plans and pricing (October 2026)

Cover photo by Brecht Corbeel on Unsplash.