Funding round
Helion Series G
Helion, which works in fusion energy research and development in Everett, raised $465M in a Series G round announced on 4 Jun 2026, led by Thrive Capital, at a $15.50B post-money valuation. 13 firms took part, 5 of them already investors. It is Helion's sixth venture round on record; the one before was a Series F in Jan 2025.
$465M
Amount raised
$15.50B
Post-money valuation
$15.04B pre-money
13
Investors
1 lead
2.9x
Step-up from the Series F
$5.42B in Jan 2025
3.0%
Stake sold
new money over the post-money
Valuation
What this round says about the price
This round priced Helion at $15.50B after the new money, 2.9 times the $5.42B of its Series F (Jan 2025). The $465M bought investors about 3.0% of the company. It came 17 months after Helion's Series F. It is 32% of the $1.47B Helion has raised in the venture rounds on record. No later venture round is on record for Helion.
Helion's funding rounds
Helion has 6 venture rounds on record. This one is highlighted.
Investors
Who put money in
Thrive Capital led the round with 12 other firms. Thrive Capital, Capricorn Technology Impact Funds, Lightspeed Venture Partners and Mithril and 1 more had backed Helion before.
Lead investor
- Thrive Capital backs 130 venture-backed companies existing investor
Also in the round
- Alta Park Capital new investor
- Anti Fund new investor
- BoxGroup backs 175 venture-backed companies new investor
- Lux Capital backs 194 venture-backed companies new investor
- Peak XV Partners new investor
- Capricorn Technology Impact Funds existing investor
- Lightspeed Venture Partners backs 454 venture-backed companies existing investor
- backs 16 venture-backed companies existing investor
- SoftBank Vision Fund backs 234 venture-backed companies existing investor
- Ford Motor Company new investor
- Good Ventures Foundation new investor
- University Endowment Fund new investor
Use of proceeds
What the money is for
According to the announcement, the money goes to product development and scaling operations.
- Product development
- Scaling operations
Comparable rounds
How it compares
The closest in time: Series G rounds in any sector within 6 months:
| Company | Announced | Amount | Post-money | Led by |
|---|---|---|---|---|
| Cyera Tech Companies | 10 Jun 2026 | $600M | $12.00B | Evolution Equity Partners |
| Alan Insurance - Agents, Carriers & Brokers | 25 Jun 2026 | $550M | $6.30B | Prosus |
| Security Guards & Patrol Services | 16 Jun 2026 | $3.3M | not disclosed | not named |
| Form Energy Batteries | 12 Aug 2026 | $750M | not disclosed | T. Rowe Price |
| Whatnot Tech Companies | 10 Aug 2026 | $545M | $20.00B | ICONIQ and Lightspeed Venture Partners |
| SiFive Electronical Components Manufacturing | 9 Apr 2026 | $400M | $3.65B | Atreides Management |
| Shield AI Aerospace and Defence | 26 Mar 2026 | $1.50B | $12.70B | Advent International and JPMorgan Chase |
| WHOOP Medical Supply Manufacturers | 31 Mar 2026 | $575M | $10.10B | Collaborative Fund |
Sources
Where this comes from
Reported by 6 sources.
Questions
Frequently asked
How much did Helion raise in its Series G round?
Helion raised $465M in its Series G round, announced in Jun 2026.
Who led Helion's Series G round?
Thrive Capital led it, with Alta Park Capital, Anti Fund, BoxGroup, Lux Capital and Peak XV Partners and 7 more.
What was Helion's valuation at the Series G round?
$15.50B post-money ($15.04B pre-money).