The paper trail

Small print.
Wide open.

A clear path from a claim to the page it came from. Here’s the filing, the research, and how we read it.

The documentS–1Anthropic, PBC26 OCT 2026 · 421 PP.
01The original SEC filingThe authoritative source, in your browser.SEC · HTML 02Download the saved filingThe complete 421-page document, optimized for downloading.PDF · 46 MB 03Download the full researchFindings, customer examples, calculations, and source references.Markdown

Page by page

Go straight to the source.

Page references count physical pages in the saved PDF, starting at 1. The printed filing number is shown separately when available.

Enter a page from 1 to 421. No PDF download needed.

From the filing

PDF page 349

Printed filing page F-3 · Extracted page text

View on the SEC
Read the page text
Table of Contents

Loss Contingencies

Description 
of the 
Matter

As further described in Note 13 to the consolidated financial statements, the Company is 
involved  in  various  legal  claims,  proceedings  and  other  regulatory  and  administrative 
proceedings,  certain  of  which  may  include  claims  for  substantial  or  indeterminate 
amounts  of  damages.  The  Company’s  assessment  of  loss  contingency  matters  requires 
significant  judgment  in  determining  both  the  likelihood  and  estimated  amount  of 
potential losses. 

How We 
Addressed 
the Matter 
in Our 
Audit

Description 
of the 
Matter

How We 
Addressed 
the Matter 
in Our 
Audit

Auditing the Company’s accounting for and disclosure of certain loss contingencies was 
especially  challenging  due  to  the  significant 
judgment  required  to  evaluate 
management’s  assessments  of  the  probability  of  loss  and  its  estimate  of  the  potential 
amounts or range of such losses.

We  performed  audit  procedures  that 
included,  among  others,  obtaining  an 
understanding  of  the  identification  and  evaluation  of  loss  contingencies,  including  the 
Company’s  assessment  of  the  likelihood  that  a  loss  will  be  incurred  and  its  ability  to 
reasonably estimate the loss or range of possible losses. We read the Company’s board 
minutes,  requested  and  received  legal  counsel  confirmation  letters,  met  with  legal 
counsel  to  discuss  the  nature  of  certain  matters  and  obtained  representations  from 
management  on  these  matters.  We  also  evaluated  the  appropriateness  of  the  related 
disclosures included in the consolidated financial statements.

Fair Value of Convertible Notes

The Company accounts for its convertible promissory notes at fair value. As discussed in 
Note 4 to the consolidated financial statements, the estimated fair value of convertible 
promissory notes as of December 31, 2025, was $41.7 billion and the recognized loss for 
the  change  in  the  fair  value  of  the  convertible  promissory  notes  for  the  year  ended 
December  31,  2025,  was $34.5  billion.  The  Company  estimated  the  fair  value  of  the 
convertible  promissory  notes  using  a  hybrid  approach  comprising  a  contingent  claims 
analysis  method  and  a  common  stock  equivalent  method  which  involved  the  use  of 
complex and subjective estimates, judgments and assumptions.

Auditing  the  Company’s  estimated  fair  value  of  convertible  notes  was  especially 
challenging due to the significant judgment required to assess management’s selection 
of  the  valuation  methodology,  determination  of  the  relative  weight  applied  to  the 
contingent claims analysis and the common stock equivalent methods, which involved 
key  judgments  and  assumptions,  including  the  Company’s  stage  of  development, 
likelihood  of  an  initial  public  offering  (IPO),  need  for  and  terms  of  financings,  and 
secondary  and  other  market  transactions.  The  estimated  fair  value  of  the  convertible 
notes  is  particularly  sensitive  to  changes  in  the  relative  weight  applied  to  the  two 
valuation methods.

We performed audit procedures that included, among others, evaluating the Company’s 
selection of the valuation methodology, evaluating the key judgments and assumptions 
noted  above  used  by  the  Company’s  valuation  specialist,  and  evaluating  the 
completeness  and  accuracy  of  the  underlying  data  supporting  the  key  judgments  and 
assumptions. We involved our valuation specialists to assist with our evaluation of the 
methodology  used  by  the  Company  and  the  key  judgments  and  assumptions. 
Specifically, we focused on the Company’s determination of the relative weight applied 
to  the  contingent  claims  analysis  and  common  stock  equivalent  methods  and  the  key 
judgments and assumptions that affected the weighting. For example, we evaluated the 
stage  of  the  Company’s  development,  inspected  the  Company’s  written  plans  and 
internal  presentations  relating  to  an  IPO  process,  and  evaluated  secondary  and  other 
market transactions during the period and their impact on the relative weight applied to 
the two valuation methods by the Company.

/s/ Ernst & Young LLP

We have served as the Company’s auditor since 2025.

San Jose, California
June 1, 2026, except for the effects of the stock split described in Note 1, which is as of September 30, 2026

F-3

Text is provided for reference. Check the original for tables, images, and exact formatting.

Find a section 16 starting points

Section links may begin before the exact paragraph cited in a finding. PDF numbers below use physical pages.

  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.

The footnotes are only the beginning.Explore the findings Read the story
The original, in context

Open the footnote.

A closer look at the filing

Anthropic · Form S-1PDF 1

Opening page 1…

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