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Back to Reports
CleanTech

Helion Energy

Helion Energy raises $425M Series F at $5.4B valuation

Everett, WASeptember 18, 20251 min read
Total Raised
$425M
Valuation
$5.4B
Latest Round
Series F
Employees
200+

Helion Energy: Series F Funding Round

Helion Energy has successfully raised $425M in Series F funding, reaching a valuation of $5.4B.

Company Overview

Fusion energy company developing clean electricity from nuclear fusion

Funding Details

The Series F round was led by Lightspeed Venture Partners, with participation from SoftBank Vision Fund 2, Sam Altman.

Company Information

  • Headquarters: Everett, WA
  • Founded: 2013
  • Employees: 200+
  • Category: CleanTech

Investment

Helion Energy plans to use the funds to accelerate product development, expand its team, and scale operations globally.

About the Investors

  • Lightspeed Venture Partners: Verified investor in Series F
  • SoftBank Vision Fund 2: Verified investor in Series F
  • Sam Altman: Verified investor in Series F

Company Info

Headquarters
Everett, WA
Founded
2013
Team Size
200+
Last Round
$425M(Sep 2025)

Investors (3)

L
Lightspeed Venture PartnersLead
Lead Investor
Verified investor in Series F
S
SoftBank Vision Fund 2
Investor
Verified investor in Series F
S
Sam Altman
Investor
Verified investor in Series F

Topics

verified(3079)real-funding(3079)helion-energycleantechseries-feverett

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