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

Capitalization 

The  following  table  sets  forth  our  cash,  cash  equivalents,  and  short-term  investments,  as  well  as  our 
capitalization, as of September 30, 2026 as follows: 

•

•

•

on an actual basis; 

on  a  pro  forma  basis,  giving  effect  to  (i)  the  Preferred  Stock  Conversion,  as  if  such  conversion  had 
occurred  on  September  30,  2026,  (ii)  the  Convertible  Notes  Conversion,  as  if  such  conversion  had 
occurred on September 30, 2026, (iii) the Class F Stock Issuance, as if it had occurred on September 
30, 2026, (iv) an increase to additional paid-in capital and accumulated deficit related to stock-based 
compensation  of  $                     related  to  RSUs  subject  to  the  RSU  Settlement,  and  (v)  the  filing  and 
effectiveness  of  our  amended  and  restated  certificate  of  incorporation  in  Delaware  that  will  become 
effective immediately prior to the completion of this offering; and 

on a pro forma as adjusted basis, giving effect to (i) the pro forma adjustments set forth above, (ii) the 
sale and issuance by us of            shares of our Class A common stock in this offering, based upon the 
assumed  initial  public  offering  price  of  $                     per  share,  which  is  the  midpoint  of  the  estimated 
offering  price  range  set  forth  on  the  cover  page  of  this  prospectus,  and  after  deducting  estimated 
underwriting discounts and commissions and estimated offering expenses payable by us, and (iii) the 
use of net proceeds from this offering, together with existing cash and cash equivalents, if necessary, to 
satisfy the estimated tax withholding and remittance obligations related to the RSU Settlement. We will 
not  receive  any  proceeds  from  the  sale  of  shares  of  our  Class  A  common  stock  by  any  of  the  selling 
stockholders. 

The pro forma as adjusted information set forth in the table below is illustrative only and will be adjusted based 
on the actual initial public offering price and other terms of this offering determined at pricing. You should read 
this  table  together  with  our  consolidated  financial  statements  and  related  notes,  and  the  section  titled 
“Management’s  Discussion  and  Analysis  of  Financial  Condition  and  Results  of  Operations”  that  are  included 
elsewhere in this prospectus. 

126

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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.