aid: newcleo
name: Newcleo
description: 'Newcleo is a nuclear energy company founded in September 2021 by Stefano
  Buono, Luciano Cinotti and Elisabeth Rizzotti, headquartered in Paris with operations
  across France, Italy, the United Kingdom, Switzerland, Belgium and Slovakia. It designs
  small modular lead-cooled fast reactors (LFR) fuelled with mixed oxide (MOX) fuel made
  from reprocessed spent nuclear fuel, with the aim of closing the nuclear fuel cycle and
  reducing long-lived waste. The group employs roughly 1,000 people, has raised over EUR
  780 million, and has grown by acquisition (Hydromine Nuclear Energy, SRS-Fucina, Rutschi
  Group). Newcleo publishes no public developer API or developer program; its only public
  machine-consumable software is a small set of open-source scientific Python libraries
  released through its newcleo-dev-team GitHub organisation.'
image: https://avatars.githubusercontent.com/u/113201176?v=4
url: https://raw.githubusercontent.com/api-evangelist/newcleo/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-tier: stub
x-tier-reason: harvest
specificationVersion: '0.23'
created: '2026-08-04'
modified: '2026-08-04'
tags:
- Company
- Energy
- Nuclear Energy
- Clean Energy
- Reactors
- Deep Tech
- Manufacturing
- Open Source
- Scientific Computing
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.newcleo.com
- type: GitHubOrganization
  url: https://github.com/newcleo-dev-team
- type: Packages
  url: packages/newcleo-packages.yml
- type: LLMsTxt
  url: llms/newcleo-llms.txt
- type: DomainSecurity
  url: security/newcleo-domain-security.yml
- type: SecondaryMarket
  url: https://www.hiive.com/securities/newcleo-stock
x-enrichment:
  date: '2026-08-04'
  status: minimal
  artifacts_added: 3
  pass: local-v1
x-coverage:
  state: none
  reason: not-a-software-company
  detail: >-
    Newcleo builds physical lead-cooled fast reactors and MOX fuel, not software products:
    www.newcleo.com is a 354-byte React shell that returns HTTP 404 with the same empty
    body for every sub-path and pulls all content client-side from a private Azure API
    Management Contentful proxy, and the only APIM routes referenced in its JavaScript
    bundle are website form handlers (contact-us, investor, supply-chain, user-admin)
    gated behind an Ocp-Apim-Subscription-Key, with no developer portal, no docs host,
    and no published specification anywhere.
  evidence:
  - url: https://www.newcleo.com/
    status: 200
  - url: https://www.newcleo.com/our-technology/
    status: 404
  - url: https://newcleo-web-apim-prod.azure-api.net/contentful
    status: 404
  - url: https://newcleo-web-apim-prod.azure-api.net/newcleo-func-production/contact-us
    status: 404
  - url: https://www.newcleo.com/.well-known/agent-card.json
    status: 404
  - url: https://www.newcleo.com/llms.txt
    status: 404
  - url: https://github.com/newcleo-dev-team
    status: 200
  checked: '2026-08-04'