Helion Energy has raised $1.9B across 4 funding rounds, plus 2 undated rounds. The latest round valued Helion Energy at $15.5B post-money, with Thrive Capital on the lead line.
Helion has raised funding led by Sam Altman, who has invested $500 million, and in 2026 it closed a $465 million Series G led by Thrive Capital that valued the company at $15.5 billion.
4 funding rounds, the latest highlighted.
Helion Energy was founded in 2013, United States.
No date is disclosed for this round.
A primary round — the company sells new shares to investors it selects. $1.5M raised, led by Y Combinator, Mithril Capital Management.
An additional $1.7bn in commitments was tied to milestones.. $500M raised, led by Sam Altman.
A primary round — the company sells new shares to investors it selects. $425M raised, led by SoftBank Vision Fund 2.
A primary round — the company sells new shares to investors it selects. $465M raised, led by Thrive Capital.
No filing has been made.
4 dated rounds, newest first.
Thrive CapitalLEADSSoftBank Vision Fund 2LEADSSam AltmanLEAD
Y CombinatorLEADMMithril Capital ManagementLEADSSoftBank Vision FundThe last valuation is $15.5B (post-money, Jun 2026).
Lead investors for each round are in the funding timeline.
The closest fusion energy peers are on the competitors page.
The routes section explains what is realistically available for a company at this stage.
No. Helion Energy is a private company; its shares do not trade on a public exchange.
Perpetual markets for stocks, gold, indices and pre-IPO names — settled on-chain, no wallet-to-exchange transfers.
