Where Is Anthropic's S-1? Inside the Public Anthropic IPO Filing (October 2026)

Anthropic's public S-1 has been on SEC EDGAR since October 26, 2026, filed by Anthropic, PBC as a Form S-1 for a Nasdaq listing under the ticker ANT. As of October 29, 2026, no amendment adding a price range has been filed.

Key Takeaways

• The public Form S-1 was filed on October 26, 2026 under the filer name Anthropic, PBC (CIK 0002130357), five months after the confidential draft of June 1.
• The filing proposes 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 $16.29 billion and a net loss of $80.7 billion for the six months ended June 30, 2026, with about $72.4 billion of the loss being a non-cash fair-value charge.
• It leaves the share count, the price range and the listing date blank; an amended S-1 will add them before a roadshow that cannot start before November 10, 2026.
• Anthropic did not file its S-1 in September: the public filing date is October 26, 2026.

Where Is Anthropic's S-1 Right Now?

Anthropic's S-1 is on the SEC's EDGAR database, filed on October 26, 2026 by Anthropic, PBC under form type S-1 and registration number 333-299633.

The filing index lists the main prospectus document plus 33 exhibits, including the post-IPO charter and the investors' rights agreement.

Anthropic's own filing announcement of the same day confirms the Nasdaq application and the ANT symbol and names Goldman Sachs and Morgan Stanley as the banks distributing the preliminary prospectus.

Any later amendment appears on the same EDGAR company page as a Form S-1/A, and the price range will arrive in one of those amendments.

As of October 29, 2026, the October 26 filing is the only S-1 on file; the earlier drafts remain confidential.

From Confidential Draft to Public S-1

Anthropic's filing moved from a confidential draft on June 1, 2026 to a public S-1 on October 26, 2026, and three steps remain before the first trade.

• June 1, 2026 — confidential draft: Anthropic announced that it had confidentially submitted a draft registration statement, which starts SEC review but publishes nothing.
• June to October — private review: the SEC staff and the company exchanged comment letters privately, and EDGAR's filing history for Anthropic, PBC now shows five confidential draft amendments between July 13 and October 9, 2026, none of which was visible at the time.
• October 26, 2026 — public S-1: the full registration statement went on EDGAR with financials, risk factors, the share structure, the exchange and the ticker.
• Why at least 15 days before the roadshow: the SEC's expanded draft registration procedures require a company that used confidential review to file publicly at least 15 days before it starts marketing, which puts the earliest roadshow at November 10, 2026.
• Next: amended S-1: a Form S-1/A adds the share count, the price range and the implied valuation, typically days before the roadshow.
• Next: SEC effectiveness: once the staff's comments are cleared, the SEC declares the registration statement effective.
• Next: pricing and first trade: the underwriters set the final price the evening before trading, and ANT opens on Nasdaq the next morning.

The confirmed dates and the market's expected listing window are tracked in the Anthropic IPO date and timeline guide.

The five steps from Anthropic's confidential draft to the first trade, with two complete as of October 29, 2026.

How to Find and Read Anthropic's S-1 on EDGAR

Anthropic's S-1 takes four steps to find on EDGAR, and five sections of the filing are worth reading first.

• Step 1: open the SEC's EDGAR company search and enter "Anthropic, PBC" as the company name, or use the CIK 0002130357.
• Step 2: filter the results to form type S-1, which also shows any S-1/A amendment filed later.
• Step 3: open the filing dated October 26, 2026 and click the main document, a single HTML file of about 14 MB.
• Step 4: use the filing index for the exhibits, including Exhibit 3.3 (the post-IPO charter) and Exhibit 4.2 (the investors' rights agreement).

Read these sections first, in this order.

• Prospectus Summary: the business overview, the offering terms and the summary financial data in a few pages.
• Risk Factors: the company's own list of what could go wrong, including frontier-model dependence, compute access, customer concentration and the governance structure.
• Management's Discussion and Analysis (MD&A): the explanation behind the revenue, the operating loss and the fair-value charge on convertible notes.
• Principal Stockholders: who owns how much before and after the offering, including the Amazon and Google positions.
• Underwriting: the 22 banks, the allocation mechanics and the lock-up arrangements.

A reading map for Anthropic's Form S-1: where to find it and which sections to open first.

What Was the Anthropic IPO Filing of June 2026?

The Anthropic IPO filing of June 2026 was a confidential draft registration statement, not a public S-1.

Anthropic announced the submission on June 1, 2026 in a short Rule 135 notice that said the offering would depend on market conditions and that the share count and price had not been set.

A confidential draft starts the SEC's review but publishes nothing, which is why searches for the filing between June and October found no document.

Anthropic took just under five months to go public with the filing, compared with about seven weeks for SpaceX in the spring of 2026, and the gap says little about the outcome: comment volume, the June 30 half-year close and the company's chosen window all affect the timing.

The June submission is now history; the operative document is the public S-1 of October 26.

What the Anthropic S-1 Says: Five Things to Know

The Anthropic S-1 comes down to five disclosures: the offering terms, the financials, the control structure, the customer base and the blanks.

• Offering terms: Class A common stock on the Nasdaq Global Select Market as ANT; 22 underwriters led by Goldman Sachs and Morgan Stanley; the $1 billion in the fee table is a registration-fee placeholder, not the deal size.
• Financials: revenue of $4.59 billion for 2025 and $16.29 billion for the first half of 2026, against $1.16 billion a year earlier; an operating loss of $693 million for the half, narrowing from $2.14 billion; a net loss of $80.7 billion, about $72.4 billion of it a non-cash fair-value change on convertible notes; a second-quarter operating profit of $974 million, the first profitable quarter in the filing's disclosure period; and $131.7 billion of cash and short-term investments at June 30, 2026.
• Control: public Class A shares carry one vote each; a single Class T share held by the Long-Term Benefit Trust elects a majority of the board; a single Class F share held by the founders' LLC carries 50.1% of the voting power; Anthropic is a public benefit corporation that has never paid a dividend and does not expect to.
• Customers and ownership: more than 1,900 customers paid over $1 million in the past year and about 250 paid over $10 million as of September 30, 2026; Amazon and Google are the largest customers, which the filing lists as a concentration risk; the Anthropic Public Benefit Fund holds 5% of the fully diluted shares.
• Blanks: the share count, the price range, the implied valuation and the listing date, all of which wait for an amended S-1.

The full income statement and cash position are explained in the guide to Anthropic's revenue and profitability.

The ownership table, including the Amazon and Google caps, is in the valuation and ownership guide.

Headline figures from Anthropic's Form S-1, as filed on October 26, 2026.

How voting control at Anthropic is split after the IPO, per the S-1 and its post-IPO charter.

What the S-1 Still Leaves Blank

The S-1 is marked "subject to completion," and six items are still blank as of October 29, 2026.

• Shares offered and the underwriters' option: will appear in a Form S-1/A.
• Price range and implied valuation: will appear in a Form S-1/A, typically days before the roadshow and not before November 10, 2026.
• Final price and proceeds: will appear in the Form 424(b) final prospectus the morning after pricing.
• Roadshow and listing dates: confirmed by the final prospectus and the exchange's listing notice.
• Retail allocation: the S-1 says the underwriters may allocate shares to clients of their online brokerage affiliates but names no broker; Business Insider, citing Bloomberg, has reported a 15% to 20% retail allocation, and Bloomberg has reported that JPMorgan will lead it, both of which remain reports.
• International tranches: the S-1 lists selling arrangements for the United Kingdom, parts of the European Economic Area, Japan, Australia, Canada and Switzerland, plus a separate European retail offering under its own prospectus, with terms still to be set.

What Happens After the Public S-1?

Three steps remain after the public S-1: an amended filing with the price range, a roadshow that cannot start before November 10, 2026, and pricing followed by the first trade.

SpaceX offers the 2026 template: a public S-1 on May 20, amendments on June 1 and June 3, pricing on June 11 at $135.00 and a first trade on June 12.

Anthropic's timing may differ, and no date is promised, but the sequence will not change.

On MEXC, the Anthropic Pre-IPO Countdown page tracks each of these steps as they land, from the amended filing to the first trade.

Follow the Anthropic Pre-IPO Countdown on MEXC

Frequently Asked Questions

Did Anthropic file its S-1 in September?

No, the public S-1 was filed on October 26, 2026; September searches found nothing because the June 1 confidential draft was not public.

Has the public Anthropic S-1 been filed?

Yes, Anthropic, PBC filed its public Form S-1 with the SEC on October 26, 2026, and the next document to watch is the amended S-1 with the price range.

Is Anthropic publicly traded?

No, the S-1 is filed but not yet effective, and ANT trades on Nasdaq only after pricing.

When is the Anthropic IPO date?

No date is set, and the roadshow cannot begin before November 10, 2026 under the SEC's 15-day rule.

What does a confidential S-1 filing mean?

A confidential S-1 is a draft the SEC reviews privately, and the registration statement becomes public only when the company files it on EDGAR, which Anthropic did on October 26, 2026.

Where can I read the Anthropic S-1?

The S-1 is on the SEC's EDGAR database under the filer Anthropic, PBC (CIK 0002130357), accession number 0001628280-26-067168.

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

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

What is Anthropic's ticker symbol and exchange?

The ticker is ANT on the Nasdaq Global Select Market, per the application disclosed in the S-1.

Who is underwriting the Anthropic IPO?

The S-1 cover lists 22 underwriters, with Goldman Sachs and Morgan Stanley first.

Conclusion

The June draft started the SEC's review, the October 26, 2026 public filing started the 15-day clock, and the exchange, the ticker, the filed numbers and the control structure are now public on EDGAR.

The price and the date are not, and they will arrive as S-1 amendments before a roadshow that cannot start before November 10.

Read the amendments first, treat pre-IPO prices as market expectations rather than company statements, and check how to buy Anthropic stock once ANT trades.

Follow the Anthropic Pre-IPO Countdown on MEXC

This article is for informational purposes only and does not constitute investment advice.

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