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

A reconciliation of our Adjusted Operating Income (Loss) and Adjusted Operating Margin to operating loss and 
operating margin, the most directly comparable GAAP financial measures, respectively, is presented below:

(in millions, except for percentages)
Operating loss

Stock-based compensation expense
Non-cash charitable contributions(1) 
Bartz settlement(2)
Adjusted Operating Income (Loss) $

Year Ended December 31,
2024

2023

2025

Six Months Ended June 30,

2025

2026

$

(551)

$ (2,980)

$ (8,060)

$

(2,135)

$

29

—

—

192

—

—

1,165

541

1,500

286

—

—

(522)

$

(2,788)

$

(4,854)

Revenue

Operating margin

Adjusted Operating Margin

$

$

41
(1,344)%

(1,273)%

386
(772)%

(722)%

$

4,585

(176)%

(106)%

______________
(1) Relates to non-cash charges from our donation matching program, the value of which is linked to employee equity awards and 

recorded in other operating and administrative expenses.

(2) Excluded from our calculation of Adjusted Operating Income (Loss) as it is not indicative of ongoing operations.

Adjusted Net Income (Loss)

We  define  Adjusted  Net  Income  (Loss)  as  net  loss  excluding  (i)  stock-based  compensation  expense,  (ii)  non-
cash  charitable  contributions,  (iii)  the  Bartz  settlement,  (iv)  the  change  in  fair  value  of  convertible  notes, 
derivative liabilities, and SAFEs, and (v) change in fair value of certain mark-to-market financial instruments.

A  reconciliation  of  Adjusted  Net  Income  (Loss)  to  net  loss,  the  most  directly  comparable  GAAP  financial 
measure, is presented below:

(693)

2,185

126

—

$

$

(1,849)

$

1,618

1,163
(184)%

(159)%

$ 16,286

(4)%
10 %

(in millions)
Net loss(1)
Stock-based compensation expense
Non-cash charitable 
contributions(2) 
Bartz settlement(3)
Change in fair value of convertible 
notes, derivative liabilities, and 
SAFEs

Change in fair value of certain 
mark-to-market financial 
instruments

Adjusted Net Income (Loss)

$

Year Ended December 31,
2024

2023

$

(1,531) $
29

(8,309) $
192

Six Months Ended June 30,

2025
(41,965) $
1,165

2025
(12,969) $
286

2026
(80,748)

2,185

—

—

—

—

541

1,500

—

—

126

—

1,045

5,434

34,308

10,942

72,388

—
(457) $

—
(2,683) $

3
(4,448) $

—
(1,741) $

8,720

2,671

______________
(1)

Includes change in fair value of convertible notes, derivative liabilities, and SAFEs, which were $1.0 billion, $5.4 billion, $34.3 
billion, $10.9 billion, and $72.4 billion for the years ended December 31, 2023, 2024, and 2025, and the six months ended June 
30,  2025  and  2026,  respectively,  primarily  driven  by  an  increase  in  the  fair  value  of  our  outstanding  convertible  promissory 
notes resulting from an increase in our enterprise valuation during each of the respective periods.

(2) Relates to non-cash charges from our donation matching program, the value of which is linked to employee equity awards and 

recorded in other operating and administrative expenses.

(3) Excluded from our calculation of Adjusted Net Income (Loss) as it is not indicative of ongoing operations.

156

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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

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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.