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The documentS–1Anthropic, PBC26 OCT 2026 · 421 PP.
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Table of Contents

Special Note Regarding Forward-looking 
Statements 

This prospectus contains forward-looking statements within the meaning of the federal securities laws, which 
statements involve substantial risks and uncertainties. All statements contained in this prospectus other than 
statements of historical fact, including statements regarding our future results of operations, financial position, 
market  size  and  opportunity,  our  business  strategy  and  plans,  the  factors  affecting  our  performance,  and  our 
objectives  for  future  operations,  are  forward-looking  statements.  In  some  cases,  you  can  identify  forward-
looking  statements  because  they  contain  words  such  as  “may,”  “will,”  “shall,”  “should,”  “expect,”  “plan,” 
“anticipate,”  “could,”  “intend,”  “target,”  “project,”  “contemplate,”  “believe,”  “estimate,”  “predict,”  “potential,” 
“goal,” “objective,” “seek,” “forecast,” or “continue,” or the negative of any of these words or other similar terms 
or  expressions  that  concern  our  expectations,  strategy,  plans,  or  intentions.  Forward-looking  statements 
contained in this prospectus include, but are not limited to, statements about: 

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our  future  financial  performance,  including  our  expectations  regarding  our  revenue,  compute  and 
infrastructure  expenses,  and  operating  expenses,  and  our  ability  to  achieve  and  maintain  future 
profitability; 

the sufficiency of our cash, cash equivalents, and investments and amounts available under our credit 
facility to meet our working capital and liquidity needs; 

the  amount,  nature,  and  timing  of  our  capital  expenditures  and  other  compute  and  infrastructure 
commitments, our ability to fund such commitments and achieve expected returns, and our ability to 
convert compute investments into revenue-generating customer workloads on anticipated timelines;

our ability to successfully execute our business and growth strategy, including scaling our operations 
and managing costs, timelines, and operational complexity, and pursuing our public benefit initiatives 
consistent with our public benefit purpose;

our expectations and management of future growth; 

our ability to raise additional capital through future debt or equity financing on acceptable terms, and 
the potential dilutive or restrictive effects of any such financing on our stockholders and operations; 

our expectations concerning relationships with third parties and access to compute and infrastructure, 
including  potential  conflicts  of  interest  with cloud  service  providers  and  chip  partners  that  develop 
competing AI offerings; 

the  demand  for  our  offerings  and  the  pricing  thereof,  including  potential  changes  to  our  pricing 
structure; 

our  ability  to  attract  and  retain  customers  and  our  expectations  regarding  revenue  concentration 
among a limited number of customers and distribution channels; 

our ability to attract, develop, and retain highly skilled personnel, and to maintain our culture, talent 
density, and mission alignment as we grow;

our ability to develop new models, platforms, and applications and bring them to market in a timely 
manner and make enhancements to our current models, platform, and applications, and to remain at 
the frontier of AI; 

our  plans  and  commitments  with  respect  to  AI  safety,  responsible  deployment,  and  safety-related 
access  restrictions  on  frontier  models,  and  the  commercial  and  operational  implications  of  those 
commitments; 

our ability to maintain the availability and operability of our models, platform, and applications; 

120

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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.