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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

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Table of Contents

Our Capital Structure

The  following  table  summarizes  certain  key  terms  of  each  class  or  series  of  our  common  stock  that  will  be 
authorized following the completion of this offering:

Category of 
Rights

Votes per share

Class A Common 
Stock
1

Class N 
Common Stock
0

Class T Common 
Stock
1

Matters on which 
entitled to vote

All matters 
submitted to 
stockholders 
generally; election 
of non-Class T 
directors; certain 
amendments to the 
terms of the LTBT 
or the rights of our 
Class T common 
stock; redemption 
of our Class T 
common stock

Not entitled to vote 
except as required 
by law, in which 
case our Class N 
common stock will 
have one vote per 
share

Election of Class T 
directors, which 
constitute a 
majority of our 
board of directors; 
redemption of our 
Class E common 
stock; certain 
amendments to the 
rights of our Class 
F common stock  

Class F Common 
Stock

50.1% of 
outstanding voting 
power on record 
date

All matters 
submitted to 
stockholders 
generally; election 
of non-Class T 
directors; certain 
amendments to the 
terms of the LTBT 
or the rights of our 
Class T common 
stock; redemption 
of our Class T 
common stock; 
redemption of our 
Class E common 
stock

Class E Common 
Stock
1

Nomination, 
change in 
designation, or 
removal of the 
Specified Class T 
Director (as 
defined below) 
(only if our NGC 
does not concur in 
the LTBT’s 
nomination, 
change in 
designation, or 
removal); certain 
amendments to the 
terms of the LTBT 
or the rights of our 
Class T common 
stock; redemption 
of our Class T 
common stock

Conversion 
rights

None

Transferability

Generally 
transferable

Converts into Class 
A common stock 
upon a sale or 
transfer to an 
unaffiliated third 
party

Generally 
transferable; 
converts to Class A 
common stock 
upon transfer as 
described above

Dividend rights

Right to receive 
liquidation 
distributions

Entitled to 
participate pro rata 
in dividends and 
distributions

Entitled to 
participate pro rata 
in dividends and 
distributions

Entitled to 
participate pro rata 
in liquidation 
distributions

Entitled to 
participate pro rata 
in liquidation 
distributions

Redeemable by 
company

No

No

None

None

None

Not transferable

Transferable only 
upon approval of 
persons comprising 
the Trust 
Amendment 
Threshold (as 
defined below)

Not transferable 
except in the case 
of a reorganization 
or redomiciliation 
of the Founder LLC 
that is approved by 
our board of 
directors and does 
not result in a 
change to the 
members of the 
Founder LLC

None

None

None

Entitled to par 
value per share

Entitled to par 
value per share

Entitled to par 
value per share

Redeemable by us 
for no 
consideration upon 
occurrence of 
certain events

Redeemable by us 
for no 
consideration upon 
occurrence of 
certain events

Redeemable by us 
for no 
consideration upon 
occurrence of 
certain events

For more information about our capital structure, see the section titled “Description of Capital Stock.” 

Risk Factors Summary 

Our  business  is  subject  to  numerous  risks  and  uncertainties,  including  those  highlighted  in  the  section  titled 
“Risk Factors” immediately following this prospectus summary. These risks could adversely affect our business, 
financial condition, and results of operations, which could cause the market price of our Class A common stock 

15

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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.