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Helical Fusion

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Developing steady-state helical fusion reactors.

Tokyo, JapanFounded 2021Energy
Valuation $50–100M Last recorded · 2026
Headcount <100 Current team size
Total funding $50–100M Disclosed equity funding
Unlock exact values This page shows ranges. Dealroom has the exact numbers for Helical Fusion and the history behind them.

About Helical Fusion

Helical Fusion is a pioneering startup based in Japan, dedicated to developing a fusion reactor using a unique helical magnetic confinement method. This method involves using superconducting helical coils arranged in a double helix structure, similar to DNA, to stably confine high-temperature plasmas. This innovative approach sets Helical Fusion apart as the only company in the world focusing on this specific technique for achieving nuclear fusion.

The company operates in the advanced energy sector, targeting a market that includes governments, research institutions, and large-scale energy providers. These clients are typically looking for sustainable and long-term energy solutions to address both energy needs and environmental concerns.

Helical Fusion's business model revolves around the design and development of fusion reactors, as well as the provision of elemental technologies essential for fusion energy. The company aims to monetize its innovations through partnerships, licensing agreements, and potentially selling or leasing its reactors and technology to energy providers and other stakeholders in the energy sector.

Revenue is generated by offering cutting-edge fusion technology solutions that promise to revolutionize the energy landscape by providing a virtually limitless and clean energy source. This positions Helical Fusion as a key player in the quest for sustainable energy, addressing global challenges related to energy security and environmental sustainability.

Source: Dealroom company data

At a glance

Status
Operational
Founded
2021
Headquarters
Tokyo, Japan
Employees
20
Open positions
None listed
Dealroom signal
81.6/100
Industry
Energy
Sector
Energy, Sustainable Development Goals, Nuclear Fusion, Climate Tech, NIF defense security and resilience, NIF Energy Security and Climate Change, DT and LS, science-based
Technology
Hardware, Deep Tech
Business model
Manufacturing
Client focus
b2b

Funding history

8 recorded events

Company financing events and reported valuations.

Deal typeDateAmountValuationInvestorsSource
SERIES BOther financing Apr 2026 $21M $83M Nichias · Konoike Transport · Mitani Sangyo · Hasetora Spinning ↗
DEBTDebt Dec 2025 $0 — Undisclosed ↗
Showing the latest 2 of 8 recorded eventsBook a demo for the full funding history →

Growth signals

Helical Fusion website traffic

Latest recorded traffic for Helical Fusion is 13K monthly website visits, up 49.4% over the last three months. Helical Fusion's team grew 5.3% over the past year.

Latest monthly visits13K 3-month web change+49.4% 1-year team growth+5.3%
Summary metrics are public; monthly history is available with a demoCompare with peers →

Similar companies

Closest operating peers by Dealroom taxonomy

Company identity and context are open; selected comparison metrics preview what is available on the platform.

Showing 8 of the closest matchesCompare every metric →

Investments and acquisitions

Capital deployed

Recent portfolio relationships for companies that also act as investors or acquirers.

Investors

10 investors on the cap table

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

Seed2 investors entered at this stage

  • SBI Investment
  • Japan Ministry of Education

Series A7 investors entered at this stage

  • Toyoda Gosei Company
  • Keio Innovation Initiative
  • Ecrowd
  • Nichias
  • Konoike Transport
  • Mitani Sangyo
  • Hasetora Spinning

Other known investors1 additional known investor

  • Global Hypergrowth Tokyo
Team profiled 3 named & role-tagged
Founders Hidden — book a demo/100 quality score
Key operators 2 quality Hidden — book a demo/100
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
🇯🇵 Japan86.7%
🇺🇸 United States6.7%
🇸🇦 Saudi Arabia6.7%
3 countries shown

Market sentiment

Posts on X, past 7 days

An AI-synthesised read of the highest-engagement posts about Helical Fusion 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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