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 322

Printed filing page 311 · Extracted page text

View on the SEC
Read the page text
Table of Contents

Material U.S. Federal Income Tax Consequences 
to Non-U.S. Holders of Our Class A Common 
Stock 

The following is a summary of the material U.S. federal income tax consequences to certain non-U.S. holders 
(as defined below) of the ownership and disposition of our Class A common stock acquired in this offering but 
does not purport to be a complete analysis of all the potential tax considerations relating thereto. This summary 
is  based  upon  the  provisions  of  the  Code,  the  Treasury  regulations  promulgated  thereunder,  administrative 
rulings,  and  judicial  decisions,  all  as  of  the  date  hereof.  These  authorities  may  be  changed,  possibly 
retroactively, so as to result in U.S. federal income tax consequences different from those set forth below. 

This  summary  does  not  address  the  tax  considerations  arising  under  the  laws  of  any  state,  local,  or  non-U.S. 
jurisdiction, or under U.S. federal non-income tax laws (such as gift and estate tax laws), except to the limited 
extent set forth below. In addition, this discussion does not address tax considerations applicable to a non-U.S. 
holder’s  particular  circumstances  or  non-U.S.  holders  that  may  be  subject  to  special  tax  rules,  including, 
without limitation: 

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

banks, insurance companies, or other financial institutions (except to the extent specifically set forth 
below), regulated investment companies, or real estate investment trusts; 

persons  subject  to  the  alternative  minimum  tax  or  Medicare  contribution  tax  on  net  investment 
income; 

tax-exempt organizations or governmental organizations; 

pension plans or tax-exempt retirement plans; 

controlled  foreign  corporations,  foreign  controlled  foreign  corporations,  passive  foreign  investment 
companies, and corporations that accumulate earnings to avoid U.S. federal income tax; 

brokers or dealers in securities; 

traders in securities or other persons that elect to use a mark-to-market method of accounting for their 
holdings in our stock; 

persons  that  own,  or  are  deemed  to  own,  more  than  five  percent  of  our  capital  stock  (except  to  the 
extent specifically set forth below); 

certain former citizens or long-term residents of the United States; 

partnerships or entities classified as partnerships for U.S. federal income tax purposes or other pass-
through entities (and investors therein); 

persons  who  hold  our  Class  A  common  stock  as  a  position  in  a  hedging  transaction,  “straddle,” 
“conversion transaction,” or other risk reduction transaction or integrated investment; 

persons who hold or receive our Class A common stock pursuant to the exercise of any employee stock 
option or otherwise as compensation; 

persons subject to special tax accounting rules as a result of any item of gross income with respect to 
our Class A common stock being taken into account in an “applicable financial statement” (as defined 
in Section 451(b) of the Code); 

persons  who  do  not  hold  our  Class  A  common  stock  as  a  capital  asset  within  the  meaning  of 
Section 1221 of the Code (generally, property held for investment); or 

persons deemed to sell our Class A common stock under the constructive sale provisions of the Code. 

311

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.