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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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Adjusted  Operating  Income  (Loss)  and  Adjusted  Operating  Margin,  as  well  as  a  reconciliation  of  these 
measures to the most directly comparable financial measures calculated in accordance with GAAP. 

Compute Investments

Investing  in  compute  is  a  prerequisite  for  long-term  growth.  We  invest  in  compute  for  research,  model 
development, serving customers, and internal usage of Claude. Our commercial traction, research progress, and 
the  scale  of  the  opportunity  ahead  give  us  the  conviction  to  continue  investing  aggressively  in  compute.  An 
increasing  portion  of  these  investments  relates  to  building  out  our  own  compute  and  infrastructure  and 
vertically  integrating  across  the  compute  supply  chain  to  secure  long-term  compute  at  the  scale  required  for 
frontier model development. These investments take the form of capital expenditures and other commitments, 
including  lease  obligations,  that  we  incur  well  in  advance  of  the  related  compute  becoming  operational  and 
generating revenue. As a result, we expect this build-out to change the cash flow profile of our business and to 
be a significant use of net cash in operating and investing activities for the foreseeable future. See the section 
titled “—Liquidity and Capital Resources” for more information.

In  addition,  as  our  compute  needs  have  grown  substantially,  we  are  shifting  from  sourcing  compute  solely 
through  fixed-term  cloud  agreements  to  a  hybrid  model  that  also  includes  leasing  chips  directly  and  hosting 
them in dedicated facilities operated on our behalf. We refer to this additional source of compute as Anthropic 
Direct,  which  helps  to  address  our  scaling  compute  requirements  and  we  believe  will  provide  long-term 
economic advantages. Anthropic Direct represents a more flexible use of capital by allowing us to separate our 
commitments for data center capacity from our commitments for the compute infrastructure deployed inside 
them.  Because  data  centers  require  longer  lead  times  but  represent  a  smaller  fraction  of  total  compute  costs, 
this  approach  enables  us  to  secure  data  center  capacity  early  while  deferring  larger  accelerator  investments 
until our specific compute needs are more certain.

As  of  and  subsequent  to  September  30,  2026,  we  have  entered  into  purchase  commitments  and  lease 
agreements,  including  short-term  commitments,  as  well  as  leases  not  yet  commenced,  with  an  aggregate 
committed spend of more than $                   . These commitments include approximately $                    expected to be 
incurred before December 31, 2030, and substantially all of the remainder is expected to be incurred between 
2031  and  2045.  Approximately  $                     of  these  commitments  are  due  in  the  next  12  months.  A  significant 
portion of this total committed spend relates to Anthropic Direct, and we expect it to represent a growing share 
of our compute investments over time. The flexibility from Anthropic Direct allows us to backfill the short-term 
compute  we  procure  during  periods  of  high  demand  with  more  cost-effective,  long-term  compute  as  our 
dedicated infrastructure comes online.

137

[Embedded graphic 1 — OCR text]
Operating efficiency drives margin expansion

Adjusted Operating Margin

19%

+240 ppts

(93)%

(129)%

(221)%

Q1'25 Q2'25 Q3'25 Q4'25 Q1'26 Q2'26

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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

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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.