DOSSIER · UPDATED 18 NOV 2025

Helion Energy

Helion is a fusion power company focused on generating zero-carbon electricity from fusion. By building on the successes of its latest fusion prototypes, Helion is building the world’s first fusion electricity demonstration facility. Their…

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Founded
2013
Headcount
149
Open roles
0
Last raised
Series F · $425M
SECTION I · THE BRIEF

Inside Helion Energy

Brief #70476Updated 18 NOV 2025EVERETTY COMBINATORSERIES F
Employbl Dossier

Helion Energy

Helion is a fusion power company focused on generating zero-carbon electricity from fusion. By building on the successes of its latest fusion prototypes, Helion is building the world’s first fusion electricity…

Founded
2013
Headcount
149
Open roles
0
Last raised
Series F · $425M
Section II — RestrictedMembers only
  • Tech stack (Helion Energy engineering primaries)
  • Hiring focus this quarter
  • Interview format & rubric
  • Comp bands by level
  • Decision-makers in talent
  • Recent news & moves
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Helion Energy's Investors

Helion Energy's Tech Stack

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LOCATIONS

Where they work

Helion Energy Headquarters Location

Everett, WA, 98203

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FUNDING

Capital raised

Total Amount Raised: $1,037,760,000

Helion Energy's Investors

Helion Energy Funding Rounds

  • Series F

    $425,000,000

  • Series F

    $425,000,000

    Series F Investors

    SoftBank Vision Fund
    Good Ventures
    Mithril Capital Management
    Capricorn Investment Group
    Sam Altman
    Lightspeed Venture Partners
    Nucor

  • Corporate Round

    $35,000,000

  • Corporate Round

    $35,000,000

    Corporate Round Investors

    Nucor

  • Series E

    $500,000,000

  • Series E

    $500,000,000

    Series E Investors

    Sam Altman
    Mithril Capital Management
    Capricorn Investment Group
    Dustin Moskovitz

  • Series D

    $40,000,000

  • Series D

    $40,000,000

    Series D Investors

    Dustin Moskovitz
    Y Combinator
    Mithril Capital Management
    Capricorn Investment Group
    Sam Altman

  • Series C

    $10,000,000

  • Series C

    $10,000,000

    Series C Investors

    Capricorn Investment Group

  • Series B

    $21,260,000

  • Series B

    $21,260,000

    Series B Investors

    Capricorn Investment Group
    Mithril Capital Management

  • Grant

    $5,000,000

  • Grant

    $5,000,000

    Grant Investors

    Advanced Research Projects Agency-Energy (ARPA-E)

  • Seed

    $1,499,986

  • Seed

    $1,499,986

    Seed Investors

    Mithril Capital Management
    Y Combinator
    Sam Altman
Funding info provided by Diffbot.
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