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The documentS–1Anthropic, PBC26 OCT 2026 · 421 PP.
01The original SEC filingThe authoritative source, in your browser.SEC · HTML 02Download the saved filingThe complete 421-page document, optimized for downloading.PDF · 46 MB 03Download the full researchFindings, customer examples, calculations, and source references.Markdown

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We believe that Al is one of the most consequential technologies in human
history. If managed well, it could rapidly accelerate scientific innovation,
greatly increase economic growth rates, bring cures for major diseases within
reach, and solve problems that have resisted generations of human effort.

Anthropic aims to realize these benefits while
navigating and preventing the risks that come witha
technological revolution this fast and this powerful.

There are four things that we would like any investor
in Anthropic to understand: the incredible potential of
Al, the risks we must address, Anthropic’s unique
approach to building a company and operating in the
world, and the ways in which our behavior may differ
from that of a purely profit-maximizing company.

Al’s potential

In 2020, four of our founders co-wrote a paper that
documented the scaling laws of AI. The scaling laws
describe how increasing compute, data, model size,
and training environments in combination produces a
rapid increase in Al’s general cognitive capabilities
and, in turn, its economic value. To many at the time,
the idea that machine intelligence would so strongly

depend on scale was surprising, but predictions made
on the basis of the scaling laws have proved true again
and again.’

The phenomenon is somewhat analogous to Moore’s
law for computer chips, under which the computing
power of these chips doubled every 12 to 18 months for
several decades. Moore’s law has been the basis of a
succession of industries—from the personal computer
to the internet—that have revolutionized the modern
economy, but we believe that the impact of an
exponential in machine cognition will be vastly greater
even than that of the exponential in computer chips.

' The idea is closely related to Richard Sutton’s concept of the bitter lesson,
which describes how sheer scale has consistently won out over more specific,
complex methods of training AI models. Note that scale is not the only source
of improvements in model capabilities—algorithmic efficiencies (“compute
multipliers”), which allow us to (for example) achieve higher capabilities with
the same amount of compute, have played a major role. But these efficiencies
are themselves found using the scaling laws: researchers test new ideas and
keep the ones that improve the scaling trend the most.

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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.