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Helion Energy

Energy · Everett, United States · Founded 2013

Helion Energy, Inc. is developing a pulsed non-ignition fusion technology to produce fusion power using deuterium and helium-3

Valuation $10–50B
Headcount 500–1k
Unlock exact values This page shows ranges. Dealroom has the exact numbers for Helion Energy and the history behind them.
Power Law Decacorn$10B+ valuation tier Thoroughbred$100M+ revenue
Knowledge graph
News Fusion's funding boom: a record 2026 as capital piles into the frontier Jul 30, 2026 News Korean fusion startup TerraFusion raises $1.5M seed for continuous-run reactor tech Jul 6, 2026 Market map US Novel Energy Startups Jun 25, 2026 News Helion raises $465M Series G at a $15.5B valuation to build its first fusion power plant Jun 5, 2026 Market map Nuclear fusion startups

Talent graph

Helion Energy's talent

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Founders Hidden — book a demo/100 quality score
Key operators Hidden — book a demo quality score
Potential founders Hidden — book a demo likely future founders
Startup mafia Hidden — book a demo alumni-founded startups
Talent movements Hidden — book a demo in · Hidden — book a demo out past 12 months

Source: Dealroom Talent Intelligence.

Investors

18 investors on Helion Energy's cap table

Sourced from Dealroom's funding and investor records. Investor profile links are shown where available.

Seed 1 investor entered at this stage
Y Combinator
Series A 1 investor entered at this stage
Mithril
Series B+ 16 investors entered at this stage
Thrive Capital
SoftBank Vision Fund
Alta Park Capital
LP
Lightspeed Venture Partners
Dustin Moskovitz
Lux Capital
Capricorn Investment Group
Anti Fund
Good Ventures
SoftBank
Sam Altman
Peak XV Partners
Nucor
BoxGroup
Bill Ford

Ownership

Who owns Helion Energy

Estimated cap table from Dealroom's shareholder data — share of equity by holder. Stakes as last recorded by Dealroom (2026). Percentages are indicative.

28.5% Founders
  • Sam Altman 14.2%

Some investors are hidden on this public profile. See the full cap table on Dealroom →

Global footprint

Where Helion Energy has talent and traffic

Workforce by country
3 countries with
team presence
🇺🇸 United States99.3%
🇨🇭 Switzerland0.5%
🇨🇦 Canada0.4%
3 countries shown
Web traffic by country
81K monthly visits
across markets
🇺🇸 United States45.3%
🇮🇳 India23.3%
🇫🇷 France4.4%
🇨🇦 Canada4.4%
🇬🇧 United Kingdom3.6%
Top 5 markets shown

Patent intelligence

$3M patent portfolio · 16 active families

Estimated portfolio value
$3M
0.02% of valuation · 5.3× larger than top peer Oklo ($501k)
16 active patent families
Where Helion Energy innovates Atomic physicsChemistryCondensed matter physicsField-reversed configurationMagnetic field

Where Helion Energy concentrates vs peers

Each axis is a top-10 topic across Helion Energy and its closest peers. #1 = 100, #10 = 10, absent = 0.

Compare against

Source: Dealroom Patent Intelligence · Patsnap. Request a demo for the full per-sub-category breakdown, individual records, and quality-score history.

Market sentiment

What the market is saying about Helion Energy

An AI-synthesized read of the highest-engagement posts about Helion Energy on X over the past 7 days. We rank by likes & retweets, ignore corporate channels, and surface the themes that broke out from real people.

Reading the room on X — pulling top posts and synthesizing themes…

Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour

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