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The documentS–1Anthropic, PBC26 OCT 2026 · 421 PP.
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FETL) in connection with the purchase of shares of Class A common stock. By the purchase of shares of Class A 
common stock, the relevant holder thereof will be deemed to represent and warrant that if it is in Korea or is a 
resident  of  Korea,  it  purchased  the  shares  of  Class  A  common  stock  pursuant  to  the  applicable  laws  and 
regulations of Korea.

Switzerland

Except  pursuant  to  the  Swiss  public  offering  described  in  the  European  prospectus  approved  by  the  German 
Federal  Financial  Supervisory  Authority  (Bundesanstalt  für  Finanzdienstleistungsaufsicht  –  Bafin)  and  filed 
with a Swiss prospectus office for automatic acceptance in accordance with Article 54(2) of the Swiss Financial 
Services  Act  (“FinSA”),  the  shares  of  Class  A  common  stock  may  not  be  publicly  offered  in  Switzerland.  In 
addition, our Class A common stock will not be listed on any trading venue in Switzerland.

Other than in the context of the Swiss public offering described above, the shares of Class A common stock may 
only be offered, sold or advertised, directly or indirectly, in or into Switzerland to any investor that qualifies as a 
professional client within the meaning of the FinSA.

This document does not constitute a prospectus within the meaning of the FinSA and has not been and will not 
be filed with, or reviewed or approved by, a Swiss review body pursuant to Article 51 FinSA. This document may 
not be publicly distributed or otherwise made publicly available in Switzerland.

Taiwan

The shares of Class A common stock have not been and will not be registered with the Financial Supervisory 
Commission  of  Taiwan  pursuant  to  relevant  securities  laws  and  regulations  and  may  not  be  sold,  issued  or 
offered  within  Taiwan  through  a  public  offering  or  in  circumstances  which  constitute  an  offer  within  the 
meaning of the Securities and Exchange Act of Taiwan that requires a registration or approval of the Financial 
Supervisory Commission of Taiwan. No person or entity in Taiwan has been authorized to offer, sell, give advice 
regarding or otherwise intermediate the offering and sale of the shares of Class A common stock in Taiwan.

Thailand

This prospectus does not, and is not intended to, constitute a public offering in Thailand. The shares of Class A 
common  stock  may  not  be  offered  or  sold  to  persons  in  Thailand,  unless  such  offering  is  made  under  the 
exemptions from approval and filing requirements under applicable laws, or under circumstances which do not 
constitute an offer for sale of the shares of Class A common stock to the public for the purposes of the Securities 
and  Exchange  Act  of  1992  of  Thailand,  nor  require  approval  from  the  Office  of  the  Securities  and  Exchange 
Commission of Thailand.

United Arab Emirates

The  shares  of  Class  A  common  stock  have  not  been,  and  are  not  being,  publicly  offered,  sold,  promoted  or 
advertised  in  the  United  Arab  Emirates  (including  the  Dubai  International  Financial  Centre)  other  than  in 
compliance  with  the  laws  of  the  United  Arab  Emirates  (and  the  Dubai  International  Financial  Centre) 
governing the issue, offering and sale of the shares of Class A common stock. Further, this prospectus does not 
constitute a public offer of securities in the United Arab Emirates (including the Dubai International Financial 
Centre)  and  is  not  intended  to  be  a  public  offer.  This  prospectus  has  not  been  approved  by  or  filed  with  the 
Central  Bank  of  the  United  Arab  Emirates,  the  Securities  and  Commodities  Authority,  Financial  Services 
Regulatory Authority or the Dubai Financial Services Authority.

United Kingdom

This  prospectus  has  been  prepared  on  the  basis  that:  (i)  any  offering  of  the  shares  of  Class  A  common  stock 
which  are  the  subject  of  this  prospectus  to  the  public  in  the  United  Kingdom  falls  within  one  or  more  of  the 
exceptions specified in Part 1 of Schedule 1 to The Public Offers and Admissions to Trading Regulations 2024 
(the “POATRs”); and (ii) the shares of Class A common stock which are the subject of this prospectus will not be 
admitted  to  trading  on  a  regulated  market  in  the  United  Kingdom  for  the  purposes  of  Rule  1.4.1  of  the 
Prospectus  Rules:  Admission  to  Trading  on  a  Regulated  Market  sourcebook  forming  part  of  the  Financial 
Conduct Authority’s Handbook of Rules and Guidance (the “PRM”). Accordingly, there will not be a prospectus 

332

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  1. Founders’ letterp. 3SEC
  2. Defined termsp. 12SEC
  3. Prospectus summaryp. 16SEC
  4. Risk factorsp. 38SEC
  5. Management’s discussion & analysisp. 144SEC
  6. Businessp. 190SEC
  7. Governancep. 254SEC
  8. Executive compensationp. 275SEC
  9. Related-person transactionsp. 293SEC
  10. Principal & selling stockholdersp. 299SEC
  11. Capital-stock rightsp. 303SEC
  12. Shares eligible for future salep. 318SEC
  13. Underwritingp. 327SEC
  14. Auditor change & expertsp. 345SEC
  15. Financial statements & notesp. 347SEC
  16. Part II & exhibit indexp. 413SEC

How this was made

Read in full.
Kept in context.

A snapshot of the filing dated , rather than a live record of later events.

3primary reviewers
421pages reviewed
43image instances checked

The review

Three primary reviewers read non-overlapping ranges of the complete main filing. All 43 embedded image instances were transcribed and visually reviewed, including the founders’ letter, charts, and customer case studies. Financial tables were also checked visually for dates, units, and column alignment.

A separate reviewer checked the draft’s calculations, accounting interpretations, and customer qualifications. An additional check covered the later merged findings. The result is 62 findings and 21 customer examples.

The boundary

Companion contracts and other exhibits named in the filing’s index are separate documents and were not independently reviewed. Customer outcomes, technical benchmarks, forecasts, and scientific priority claims remain attributed company or customer disclosures.

The numbers

Dollar figures are U.S. dollars. H1 means the six months ended June 30; Q2 means the three months ended June 30. The 2026 interim financial statements are unaudited. Our calculations show their inputs and are labeled separately from reported values.

Blank fields stay undisclosed. Figures with different periods, conditions, or potentially overlapping scopes are kept separate. An earlier tender price is not an IPO price.

What the evidence labels mean
Reported in filing
A company disclosure, with the period and accounting basis retained.
Company estimate / company claim
An estimate or assertion attributed to the company, with its uncertainty preserved.
Our calculation
A derived figure using cited inputs. It is not a separately reported company metric.
Customer example
A selected case study, with its measurement limits. It is not representative ROI.
Proposed / conditional
A status qualifier for an arrangement that is not yet effective or depends on stated conditions.

About updates. This edition is tied to the October 26, 2026 filing. Any later revision should identify its new source date and preserve the basis of earlier claims.

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A closer look at the filing

Anthropic · Form S-1PDF 1

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Filed October 26, 2026. PDF is approximately 46 MB and opens only when requested. Section links may precede the exact cited paragraph.