Where Is Anthropic's S-1? Inside the Anthropic IPO Filing June 2026

Key Takeaways

• Anthropic's S-1 is public. It was filed with the SEC on October 26, 2026 and sits on EDGAR under Anthropic, PBC (CIK 0002130357), File No. 333-299633.
• The June 2026 filing was the confidential draft submitted on June 1; the SEC reviewed it privately for five months before the public version appeared.
• The filing applies to list Class A common stock on the Nasdaq Global Select Market as ANT, with 22 underwriters led by Goldman Sachs and Morgan Stanley.
• It discloses revenue of $4.585 billion for 2025 and $16.3 billion for the first half of 2026, a first-half net loss of $80.7 billion, and $131.7 billion of cash and short-term investments at June 30, 2026.
• It leaves three things blank: the number of shares, the price range and the date. The share count and price range come in an amended S-1 shortly before the roadshow; the roadshow itself cannot start before November 10, 2026, 15 days after the public filing, and the date is fixed only at pricing.
• Public buyers get one vote per share; a single founders' share carries 50.1% of the vote and the Long-Term Benefit Trust elects a board majority.

For most of 2026, the honest answer to "where is Anthropic's S-1?" was "in a drawer at the SEC."

That changed at 9:00 a.m. Eastern on October 26, 2026, when the registration statement Anthropic had drafted in June became a public document.

This guide tells you where to find it, what the June filing was, and what the public version says, section by section.

Where Is Anthropic's S-1 Right Now?

Anthropic's S-1 is on the SEC's EDGAR database, filed on October 26, 2026 and accepted at 9:00 a.m. Eastern that morning.

The filer is Anthropic, PBC, CIK 0002130357, and the registration number is 333-299633.

The main document is a 14-megabyte HTML page; the filing index lists it with 33 exhibits and the case-study graphics.

The fastest route is the EDGAR full-text search: enter "Anthropic, PBC" and filter by form type S-1.

The same page will show any Form S-1/A amendments as they arrive, and those amendments are where the price range will appear.

Anthropic's own filing announcement is the shorter read.

It confirms the Nasdaq application and the ticker, and names Goldman Sachs and Morgan Stanley as the banks distributing the preliminary prospectus.

Finding the S-1 and its exhibits on EDGAR. Source: SEC EDGAR.

What Was the Anthropic IPO Filing of June 2026?

The June 2026 filing was a confidential draft registration statement, submitted to the SEC on June 1, 2026 and announced in a seven-sentence notice under Rule 135.

A confidential draft starts the SEC's review but publishes nothing; the SEC treats it as a submission, and the registration statement is filed only when the public version appears.

That is why EDGAR showed no Anthropic S-1 between June and October.

The June 1 notice said the offering would "depend on market conditions and other factors" and that "the number of shares to be offered and the price have not yet been set."

Both statements remain true of the public version.

How the Filing Got From June to October

Confidential review lets a company exchange comment letters with the SEC in private, then go public once the draft is close to final.

The SEC's expanded draft-registration procedures require the public filing at least 15 days before the roadshow.

Anthropic took just under five months from draft to public filing; SpaceX took seven weeks in the spring of 2026.

The length of the gap says little about the outcome.

It reflects the volume of SEC comments, the time to close the June 30 half-year financials, and the company's own choice of window.

Anthropic's IPO stages after the public filing. Source: Anthropic, PBC Form S-1, filed October 26, 2026 (SEC EDGAR); SEC Division of Corporation Finance, expanded draft registration statement procedures (March 3, 2025).

Track ANTHROPIC Pre-IPO Pricing

What Does the Anthropic S-1 Say About the Offering?

The S-1 fixes the exchange, the ticker, the security and the banks, and leaves the size and price open.

Anthropic has applied to list Class A common stock on the Nasdaq Global Select Market under the symbol ANT.

The cover names 22 underwriters, with Goldman Sachs & Co. LLC and Morgan Stanley listed first.

The number of shares offered by the company and by selling stockholders, the underwriters' option and the price range are all blank.

The $1 billion in the fee table is the one number people misread.

It is the figure Rule 457(o) requires for calculating the $87,000 filing fee, not the size of the deal, and it will be amended when the price range is set.

What Do the S-1's Financial Statements Show?

The financial statements show a company whose revenue grew from $41 million in 2023 to $16.3 billion in the first six months of 2026, whose operating loss narrowed to $693 million in that half-year, and whose net loss widened to $80.7 billion because of a $72.4 billion non-cash charge on convertible notes.

Cash and short-term investments stood at $131.7 billion on June 30, 2026, after $141.1 billion of capital raised.

The fair-value line is the one to understand.

Anthropic carries its convertible notes, most of them held by Amazon, at fair value; every increase in the company's valuation raises that liability and runs through the income statement as a loss, without any cash leaving the company.

The filing attributes the charge to "an increase in the fair value of our outstanding convertible promissory notes."

At the IPO those notes convert into Class N shares, and the line disappears.

The profitability guide walks through the full income statement, the non-GAAP bridge and what the filing says about cash.

How much of each period's net loss is the fair-value charge. Source: Anthropic, PBC Form S-1, filed October 26, 2026 (SEC EDGAR).

What Does the S-1 Say About Who Controls Anthropic?

Control sits with two single shares.

Class F, one share held by Anthropic Founders, LLC, "will be entitled to an aggregate number of votes that equals 50.1% of the total voting power."

Class T, one share held by the Long-Term Benefit Trust, elects the smallest number of directors that forms a board majority.

Public investors buy Class A stock with one vote per share, and Amazon's converted notes become Class N stock with no vote.

The post-IPO charter, filed as Exhibit 3.3, gives Class F a sunset: the share is redeemed 450 days after the founders' company has had fewer than three qualifying members for 90 consecutive days.

The Trust's share has no fixed sunset; its redemption needs 80% of the board plus the Trust, or a stockholder vote at a high threshold.

The valuation and ownership guide covers who holds how much.

The filing's own summary risk factors name the "novel capital structure" and the concentration of voting power as risks to Class A holders.

Voting power, board control and economic rights by share class. Source: Anthropic, PBC Form S-1, filed October 26, 2026 (SEC EDGAR) and Exhibit 3.3.

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What Else Is in the Anthropic IPO Prospectus?

Four more disclosures reward a few minutes each.

The customer tiers: more than 11,900 customers above $100,000 of trailing-twelve-month revenue, more than 1,900 above $1 million, and about 250 above $10 million, all as of September 30, 2026.

The retention figure: Net Revenue Retention of approximately 900% as of the same date, meaning the cohort of qualifying customers from a year earlier now spends nine times as much.

The Public Benefit Fund: 846,840,960 Class N shares, 5% of fully diluted shares at June 30, 2026, placed in a wholly owned subsidiary dedicated to the company's stated purpose.

And the split: a 10-for-1 forward split of Class A and Class N shares on September 17, 2026, which is why any per-share figure from before that date needs dividing by ten.

The risk-factor section runs to dozens of pages.

Its summary leads with dependence on frontier models, access to compute, reliance on the co-founders, customer concentration and the regulatory environment, before reaching the governance risks above.

What Does the S-1 Still Leave Blank?

Everything about the deal itself.

The filing is marked "subject to completion," and the share count, price range, implied valuation, proceeds and lock-up release dates all wait for an amended S-1.

The run-rate revenue figure the summary defines is also blank in this version.

What the first public filing contains and what amendments will add. Source: Anthropic, PBC Form S-1, filed October 26, 2026 (SEC EDGAR).

What Happens After the Public S-1?

Three steps remain: an amended filing with the price range, a roadshow that cannot start before November 10, 2026, and pricing followed by the first trade.

SpaceX's 2026 sequence is the closest recent template: public S-1 on May 20, amendments on June 1 and June 3, pricing on June 11 at $135.00 and first trade on June 12.

Anthropic's version may run faster or slower, and the filing promises no date.

The guide to the Anthropic IPO date and status tracks each remaining step as it happens.

Frequently Asked Questions

Is Anthropic publicly traded?

No; the S-1 has been filed but has not become effective, and ANT will trade only after the IPO prices.

Has the public Anthropic S-1 been filed?

Yes, on October 26, 2026, after a confidential draft submitted on June 1; the next document to watch is the amended S-1 with the price range.

When is the Anthropic IPO date?

Not set; the roadshow cannot begin before November 10, 2026.

What does a confidential S-1 filing mean?

It is a private draft the SEC reviews before anything is published; the registration statement is filed only when the public version appears.

Where can I read the Anthropic S-1?

On SEC EDGAR under Anthropic, PBC (CIK 0002130357), accession number 0001628280-26-067168.

What will Anthropic's ticker symbol be?

ANT, on the Nasdaq Global Select Market.

What is Anthropic's valuation?

$965 billion post-money as of the May 28, 2026 Series H round; the IPO valuation will be implied by the price range in an amended filing.

How can I buy Anthropic stock before the IPO?

You cannot buy shares before the first trade; indirect exposure exists through Amazon's stake or through pre-IPO futures that convey no ownership.

Is the Anthropic S-1 the same as the IPO prospectus?

The S-1 contains the preliminary prospectus, and the final prospectus with the price and share count is filed separately on Form 424(b) after pricing.

Conclusion

The June 2026 filing started a clock that ran out on October 26, and the document that appeared answers most of the questions this series spent the summer hedging.

The exchange, the ticker, the filed numbers and the control structure are now facts on EDGAR.

The price and the date are not, and they will arrive the same way, as amendments to the same filing.

Read those before anything else, and treat any pre-IPO price as a market's expectation rather than a company's statement.

For what the listing means for a buyer, the guide to how to buy Anthropic stock covers the three routes that exist until ANT trades.

Track ANTHROPIC Pre-IPO Pricing

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