CleanTech

Helion Energy

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

$425M
Total Raised
Series F
Latest Round
2013
Founded
200+
Employees
Everett, WA
1 min read

Quick Facts

Valuation
$5.4B
Latest Round Size
$425M
Latest Round Date
September 2025

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

Key Investors

Lightspeed Venture Partners
Lead Investor
Verified investor in Series F
SoftBank Vision Fund 2
Investor
Verified investor in Series F
Sam Altman
Investor
Verified investor in Series F

About the Author

Editorial Team
Editorial Team
Curated funding news from verified sources