Anthropic files to sell shares to the public: what we know

Anthropic, PBC has taken the first formal step towards becoming a company that members of the public can own a piece of. On 26 October 2026, it filed a document called a Form S-1 with the US Securities and Exchange Commission, the American government body that oversees the buying and selling of company shares.

This post covers what the filing says and what it leaves out.

What has actually happened?

Anthropic has applied for what is called an initial public offering, or IPO. This is the moment a privately owned company first offers its shares to the general public. A share is a small slice of ownership in a company.

The Form S-1 is the paperwork a company must file before it can do this in the US. It works a bit like a planning application before building a house extension: you set out your plans, and nothing can begin until they are approved.

The shares on offer would be a type the company calls Class A common stock. Anthropic has applied to list them on the Nasdaq Global Select Market under the short code 'ANT'. A stock exchange like Nasdaq is a marketplace where shares are bought and sold.

What is still unknown?

Quite a lot, and the company is open about that. The filing is preliminary and described as subject to completion, so it is a draft that can still change.

• The number of shares to be offered has not been decided.
• The price range for the shares has not been set.
• The cover page of the filing gives no financial figures.
• The announcement does not say when the shares might go on sale.

The registration statement has been filed but has not yet become effective, meaning it has not been given the go-ahead. Until it is, the shares cannot be sold and no offers to buy them can be accepted. Anthropic's announcement also states that it is not, by itself, an offer to sell shares.

The offer will only be made through a prospectus, the formal document that describes what is being sold. Once it is ready, copies of the preliminary prospectus will be available from two banks, Goldman Sachs and Morgan Stanley.

Who will be in charge?

The answer to this question is the most unusual part of the filing.

Anthropic is a public benefit corporation registered in the US state of Delaware, which is what the PBC in its name stands for. This type of company writes a wider purpose into its official make-up alongside running as a business. Anthropic's stated purpose is the responsible development and maintenance of advanced AI for the long-term benefit of humanity.

A company's board is the group of people, called directors, who oversee it and make the big decisions. At Anthropic, a body called the Long-Term Benefit Trust holds a special type of share known as Class T stock. The trust can elect and remove the directors who will make up a majority of the board.

There is also a single share called a Class F share, held by a business set up for the company's founders, known as a founders' LLC. That one share carries 50.1% of the voting power, so on matters decided by voting power it holds just over half of the votes on its own.

Because of this, Anthropic will count as a 'controlled company' under Nasdaq rules. The label applies to a listed company where more than half of the voting power sits with one holder or group.

So people who buy Class A shares would own a slice of the company, but they could not outvote that single Class F share on matters decided by voting power.

Why does this matter?

For anyone curious about AI, the filing gives an early look at how a well-known AI company plans to run itself if its shares go public.

The set-up on the cover page suggests the people behind Anthropic want control to stay with the trust and the founders rather than pass to whoever buys shares. Some will see that as a sensible safeguard and others as a drawback. It helps to understand the structure before deciding which.

For small-business owners who follow the AI industry, the filing is a reminder that the companies behind AI tools are businesses with their own structures and owners, and how they are governed can shape the decisions they make.

What happens next?

The number of shares, the price range and the financial figures are still blank, and nothing can be sold until the registration statement becomes effective.

If the filing is updated, those missing details are the ones to watch. This post explains the filing only and is not advice about whether to buy shares. Anyone thinking about investing should read the full prospectus once it is available.

Source: Anthropic files for an IPO (Form S-1), Anthropic, PBC. Listed in AI News Week 45, where we track every AI release each week.