# Helion funding rounds and investors

As of 13 Oct 2026, Helion has raised $1.43B across 5 verified rounds on record; latest: $465 million Series G led by Thrive Capital, announced 4 Jun 2026.

Helion Energy specializes in developing fusion energy technology to produce clean, safe, and scalable electricity.

Website: https://www.helionenergy.com/  
Headquarters: Redmond, Washington  
Page: https://fireround.dev/companies/helionenergy.com

## Verified rounds

| Announced | Round | Amount | Lead investors | Other investors | Sources |
| --- | --- | --- | --- | --- | --- |
| 2026-06-04 | Series G | $465 million | Thrive Capital | Alta Park Capital, Anti Fund, BoxGroup, Lux Capital, Peak XV Partners, Bill Ford, Capricorn’s Technology Impact Funds, Lightspeed, Mithril Capital Management, Dustin Moskovitz through Good Ventures Foundation, SoftBank Vision Fund 2 | [helionenergy.com](https://www.helionenergy.com/newsroom/helion-raises-465-million-series-g-funding-round-to-meet-surging-global-demand-for-power), [techcrunch.com](https://techcrunch.com/2026/06/04/helion-the-sam-altman-backed-fusion-startup-raises-465m-to-build-a-power-plant-for-microsoft) |
| 2025-01-28 | Series F | $425 million | not stated | Sam Altman, Mithril Capital Management, Capricorn Investment Group, Dustin Moskovitz through Good Ventures Foundation, Nucor, Lightspeed, SoftBank Vision Fund 2 | [helionenergy.com](https://www.helionenergy.com/newsroom/helion-announces-425m-series-f-investment-to-scale-commercialized-fusion-power) |
| 2021-11-05 | Series E | $500 million | Sam Altman | Dustin Moskovitz, Mithril Capital Management, Capricorn Investment Group | [helionenergy.com](https://www.helionenergy.com/newsroom/helion-raises-500m), [businesswire.com](https://www.businesswire.com/news/home/20211105005258/en/Helion-Raises-%24500-Million-Targets-2024-for-Demonstrating-Net-Electricity-from-Fusion) |
| 2020-09-23 | Series D | $40 million | Dustin Moskovitz | none named | [helionenergy.com](https://www.helionenergy.com/newsroom/fusion-energy-startup-helion-energy-closes-latest-funding-round-at-1-25b-valuation) |
| 2014-08-14 | Series A | $1.5 million | not stated | Y Combinator, Mithril Capital Management | [techcrunch.com](https://techcrunch.com/2014/08/14/y-combinator-and-mithril-invest-in-helion-a-nuclear-fusion-startup) |

Source: Fireround (https://fireround.dev), an open-source funding feed. Each round is checked against the pages listed with it.