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Helion Energy

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

Everett, United StatesFounded 2013Energy
Valuation $10–50B Last recorded · Jun/2026
Headcount 500–1k Current team size
Unlock exact values This page shows ranges. Dealroom has the exact numbers for Helion Energy and the history behind them.

At a glance

Founded
2013
Headquarters
Everett, United States
Sector
Energy
Power Law
Decacorn$10B+ valuation tierThoroughbred$100M+ revenue

Research & analysis

From the Dealroom 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

Latest news

Press, funding announcements and product moves mentioning Helion Energy.

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Investors

18 investors on the cap table

From Dealroom's funding and investor records, grouped by the round each investor first entered.

Seed1 investor entered at this stage

Series A1 investor entered at this stage

  • Mithril

Series B and later16 investors entered at this stage

Ownership

Share of equity by holder

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

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

Talent

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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.

Global footprint

Workforce and web traffic by country
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

Patents

Estimated portfolio value
$3M

16 active patent families included in this estimate.

A patent family groups patent filings for the same invention. Source: Dealroom · PatSnap.

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Market sentiment

Posts on X, past 7 days

An AI-synthesised read of the highest-engagement posts about Helion Energy on X, ranked by likes and reposts, corporate channels excluded.

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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