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

Operating Expenses

Compute and Infrastructure

(in millions, except for percentages)
Compute and infrastructure

Percentage of revenue

Six Months Ended June 30,

2025

2026

$ Change

% Change

$

2,334

$

8,945

$

6,611

283 %

201 %

55 %

Compute  and  infrastructure  expenses  for  the six  months  ended  June  30,  2026  increased  by $6.6  billion,  or 
283%, compared to the six months ended June 30, 2025. The increase was driven by the delivery of committed 
compute  throughout  the  first  half  of  2026  under  our  CSP  arrangements.  As  our  compute  and  infrastructure 
capacity grows, the associated compute and infrastructure expenses have increased accordingly.

Compute and infrastructure expenses as a percentage of revenue decreased as revenue increased significantly in 
the six months ended June 30, 2026 compared to the six months ended June 30, 2025, against a compute base 
that was primarily committed in advance and did not fluctuate with in-period demand.

Personnel

(in millions, except for percentages)
Personnel

Percentage of revenue

Six Months Ended June 30,

2025

2026

$ Change

% Change

$

538

$

3,152

$

2,614

486 %

46 %

19 %

Personnel  expenses  for  the six months ended June 30, 2026 increased  by $2.6 billion,  or 486%, compared to 
the  six  months  ended  June  30,  2025.  The increase  was  driven  by  a $1.9  billion  increase  in  stock-based 
compensation expense and a $510 million increase in cash compensation, both as a result of headcount growth.

Sales, Marketing, and Partnerships

(in millions, except for percentages)
Sales, marketing, and partnerships

Percentage of revenue

Six Months Ended June 30,

2025

2026

$ Change

% Change

$

120

$

3,168

$

3,048

2,540 %

10 %

19 %

Sales, marketing, and partnerships expenses for the six months ended June 30, 2026 increased by $3.0 billion, 
or  2,540%,  compared  to  the six  months  ended  June  30,  2025.  The increase  was  primarily  driven  by  a $2.7 
billion  increase  in  fees  paid  to  channel  partners,  reflecting  the  growth  of  our  business,  and  a $273  million 
increase in marketing and advertising expenses, reflecting higher media spend to support product launches.

Other Operating and Administrative

(in millions, except for percentages)
Other operating and administrative

Percentage of revenue

Six Months Ended June 30,

2025

2026

$ Change

% Change

$

306

$

1,714

$

1,408

460 %

26 %

11 %

Other operating and administrative expenses for the six months ended June 30, 2026 increased by $1.4 billion, 
or  460%,  compared  to  the six  months  ended  June  30,  2025.  The increase  was  primarily  driven  by  a $251 
million  increase  in  vendor  costs  related  to  data  quality  and  performance  evaluation  services,  a $223  million 
increase  in  information  technology  and  cloud  software  costs,  a $222  million  increase  in  payment  processing 
fees, a $205 million increase in professional services costs, a $126 million increase in non-cash charges related 
to our donation matching program, and a $68 million increase in facility and occupancy costs.

149

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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.