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Startup · Denmark

Copenhagen Atomics

HQ Kastrup, DenmarkFounded 201451-200 employees

Copenhagen Atomics is building molten salt reactors powered by thorium, the cheapest, cleanest scalable nuclear energy. First chain-reaction planned for 2028.

Startup
WebsiteLinkedIn
Total raised
~$2.9M
3 rounds
Last round
~$2.9M
Grant · Jun 30, 2025
Products
1

Products1

Onion Core®

A compact reactor design intended for mass manufacturing.

Maturity not rated

Newest unveiled first. Open a product for its milestone timeline, components and sources.

Funding3 rounds · ~$2.9M

Disclosed
~$2.9M
Latest
~$2.9MGrant · Jun 30, 2025
  • Grant
    ~$2.9M
    Jun 30, 2025
  • Series A
    Speculative
    Undisclosed
    Jun 30, 2025
  • Series A
    Speculative
    Undisclosed
    Jan 6, 2023

Totals add known amounts using recorded USD conversions where available; other currencies are shown separately. A ~ marks an estimated amount.

Sources7

Profile3

  1. 1
    DatabaseSixth-Domain public startup directory

    Sixth-Domain · Supports Organization · country, Organization · kind

    “{"country": "Denmark", "hq_iso2": "DK", "id": "1d6447c4-2b66-4906-8023-4c0311e466c9"}”
  2. 2
    CompanyMolten Salt Reactors Powered by Thorium | Copenhagen Atomics

    Copenhagen Atomics · Supports Organization · description, Organization · name, Organization · website

    “Copenhagen Atomics is building molten salt reactors powered by thorium, the cheapest, cleanest scalable nuclear energy. First chain-reaction planned for 2028.”
  3. 3
    DatabaseCopenhagen Atomics - LinkedIn company profile

    LinkedIn · Supports Organization · employee range, Organization · founded year, Organization · hq city, Organization · linkedin url

    “employee_range: 51-200 (profile: 51-200 employees)”

Products1

  1. 4
    CompanyOnion Core® Reactor Technology | Copenhagen Atomics

    Copenhagen Atomics · Supports System

    “Copenhagen Atomics has invented the Onion Core® technology, enabling a compact reactor that can be mass-manufactured efficiently while requiring only a small amount of materials”

Funding3

  1. 5
    DatabaseCopenhagen Atomics - CB Insights

    CB Insights · Supports Funding round

    “1/6/2023 Series A”
  2. 6
    DatabaseCopenhagen Atomics - PitchBook company profile

    PitchBook · Supports Funding round, Organization · employee range, Organization · founded year, Organization · linkedin url

    “Accelerator/Inc”
  3. 7
    DatabaseCopenhagen Atomics - 2026 Funding Rounds & List of Investors - Tracxn

    Tracxn · Supports Funding round

    “Grant (prize money) round of $2.95M from Europa”

Each fact on this page is attached to the sources that support it. Archived copies are linked when we keep one.