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

Other Income (Expense), Net

Other  income  (expense),  net  was  not  material  for  the  quarters  presented  prior  to  2026.  Other  income 
(expense),  net  of $(309) million  and $(8.4) billion  for  the three months ended March 31, 2026  and June 30, 
2026, respectively, was primarily driven by the initial fair value recognition and subsequent change in fair value 
of  the  assets  and  liabilities  recognized  under  the  note  purchase  agreements.  See  Note  4  to  our  consolidated 
financial statements included elsewhere in this prospectus.

Provision for Income Taxes

Provision for income taxes was not material for the quarters presented.

Quarterly Adjusted Operating Income (Loss) and Adjusted Operating Margin

(in millions, except for 
percentages)
Operating income (loss)
Stock-based compensation 
expense
Non-cash charitable 
contributions(1)
Bartz settlement(2)
Adjusted Operating 
Income (Loss)

Revenue

Operating margin
Adjusted Operating 
Margin

$

$

Three Months Ended

March 31,
2025

June 30,
2025

September 30,
2025

December 31,
2025

March 31,
2026

June 30,
2026

$

(935)

$ (1,200)

$ (3,089)

$ (2,836)

$ (1,667)

$

974

105

—

—

181

—

—

305

—

1,500

574

541

—

924

126

—

1,261

—

—

(830)

$ (1,019)

$

(1,284)

$ (1,721)

$

(617)

$ 2,235

$

376
(249)%

$

787
(152)%

1,382
(224)%

$ 2,040

$

4,731

$ 11,555

(139)%

(35)%

(221)%

(129)%

(93)%

(84)%

(13)%

8 %

19 %

______________
(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.

Quarterly Adjusted Net Income (Loss)

Three Months Ended

(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)

March 31,
2025
(6,592) $

$

June 30,
2025

(6,377) $

September 30,
2025
(12,138) $ (16,858) $ (14,439) $ (66,309)

December 31,
2025

March 31,
2026

June 30,
2026

105

—

—

181

—

—

305

—

1,500

574

541

—

924

126

—

1,261

—

—

5,701

5,241

9,165

14,201

12,791

59,597

—

—

—

3

288

8,432

$

(786) $

(955) $

(1,168) $

(1,539) $

(310) $

2,981

160

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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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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.