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

Anthropic, PBC
Notes to Consolidated Financial Statements
(Continued)

carryforwards that can be utilized annually to offset future taxable income and future income tax, respectively. 
In general, an ownership change as defined by Section 382 results from transactions increasing the ownership 
of  certain  stockholders  or  public  groups  in  the  stock  of  a  corporation  by  more  than  50%  over  a  three-year 
period. The Company last completed a Section 382 analysis as of December 31, 2023, and has determined that 
ownership  changes  have  taken  place  in  October  2021  and  September  2023.  However,  no  limitations  on  the 
utilization  of  tax  attributes  were  identified  as  of  that  date. A  Section  382  study  has  not  been  conducted 
subsequent to December 31, 2023. Ownership changes that may have occurred in 2024 and 2025 may therefore 
subject tax attributes to a yearly limitation. 

A  reconciliation  of  the  beginning  and  ending  amount  of  the  Company’s  unrecognized  tax  benefits  during  the 
years ended December 31, 2024, and 2025 is as follows (in millions):

Balance, beginning of year

Increases related to prior year tax positions

Increases related to current year tax positions

Balance, end of year

Year Ended December 31,

2024

2025

$

$

7 $

10

84

101 $

101

4

188

293

The  Company  files  tax  returns  in  the United  States  and  various  state  and  foreign  jurisdictions  in  which  the 
Company conducts business activities. The federal and state income tax returns are subject to examination for 
all  tax  years, the tax returns in the United Kingdom are open from 2023 onwards and the Ireland tax returns 
are open from 2024 onwards. To the extent the Company has tax attribute carryforwards, the tax years in which 
the attribute was generated may still be adjusted upon examination by the Internal Revenue Service (“IRS”) or 
state  tax  authorities  to  the  extent  utilized  in  a  future  period.  Additionally,  the  Company  is  subject  to  tax 
examinations by tax authorities in foreign jurisdictions where it has business operations. There are currently no 
federal, state, or foreign audits in progress by the IRS or any other jurisdictions for any tax years. 

Given the Company’s full valuation allowance, none of the unrecognized tax benefits, if recognized, would affect 
the Company’s effective tax rate. The Company’s policy is to recognize interest and penalties related to income 
taxes as components of income tax expense. As of December 31, 2024 and 2025, the Company did not accrue 
interest and penalties related to unrecognized tax benefits.

The Company considers the earnings of its foreign subsidiaries to be indefinitely reinvested and, accordingly, 
has  not  provided  U.S.  federal  or  state  income  taxes  or  foreign  withholding  taxes  on  such  earnings.  The 
Company does not expect material taxes would be due upon repatriation of these earnings.

The amount of cash taxes paid by (refunded to) the Company during the year ended December 31, 2025 is as 
follows (in millions):

Federal

State

Foreign

United Kingdom

South Korea

All Other Foreign

Cash taxes, net of amounts refunded

Year Ended 
December 31, 
2025

$

$

—

—

10
(2)

—

8

In July 2025, the United States enacted tax legislation commonly referred to as the One Big Beautiful Bill Act 
(the  “OBBB  Act”).  The  OBBB  Act,  among  other  things,  extends  certain  provisions  of  2017  U.S.  federal  tax 
legislation relating to federal bonus depreciation. The OBBB Act permanently reverted to pre-Tax Cuts and Jobs 
Act  rules  allowing  full  deduction  of  domestic  research  and  experimental  expenses  effective  for  tax  years 

F-56

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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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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.