Helion

Helion announced $465M in Series G financing on June 4, 2026. Helion announced a $465 million Series G led by Thrive Capital to accelerate commercial fusion deployment, scale manufacturing capacity, and deliver clean electricity to customers. The company later noted that the oversubscribed round closed at $500 million in September 2026.

Round details

The financing includes backing from Thrive Capital, Lux Capital, Peak XV Partners, Alta Park Capital, Anti Fund, BoxGroup, Lightspeed Venture Partners, SoftBank Vision Fund 2. The company reported a $15.5B post-money valuation alongside the transaction.

• Round: Series G
• Capital announced: $465M
• Total funding reported: $1.5B
• Headquarters: Everett, WA

How the company plans to use the capital

Helion said the funding will accelerate commercial deployment of fusion, scale manufacturing capacity, and expand the company’s ability to deliver clean electricity to customers.

Why this matters for GTM teams

Helion said the round was led by Thrive Capital and included both new and existing investors.

Fresh capital is often an operational signal rather than a buying signal by itself. Teams should validate the company’s hiring pattern, product launches, geographic expansion, and technology priorities before choosing the message and timing of outreach.

Source and methodology

This report is based on the company’s announcement and records the disclosed amount, round, investors, location, and stated use of funds. SalesTools Research does not estimate undisclosed valuation or revenue figures.

Primary source: Helion Series G announcement.