Funding round
Helion Series F
Helion, which works in fusion energy research and development in Everett, raised $425M in a Series F round announced on 28 Jan 2025, at a $5.42B post-money valuation. 9 firms took part, 6 of them already investors. It is Helion's fifth venture round on record; the one before was a Growth in Sep 2023.
$425M
Amount raised
$5.42B
Post-money valuation
$5.00B pre-money
9
Investors
no lead named
1.8x
Step-up from the Series E
$3.00B in Nov 2021
7.8%
Stake sold
new money over the post-money
Valuation
What this round says about the price
This round priced Helion at $5.42B after the new money, 1.8 times the $3.00B of its Series E (Nov 2021). The $425M bought investors about 7.8% of the company. It came 16 months after Helion's Growth. It is 29% of the $1.47B Helion has raised in the venture rounds on record. Helion raised again 17 months later: a Series G round of $465M in Jun 2026, at $15.50B post-money.
Helion's funding rounds
Helion has 6 venture rounds on record. This one is highlighted.
Investors
Who put money in
9 firms took part; no lead investor was named.
Investors
- Lightspeed Venture Partners backs 454 venture-backed companies new investor
- SoftBank Vision Fund backs 234 venture-backed companies new investor
- backs 16 venture-backed companies existing investor
- Capricorn Investment Group existing investor
- Nucor existing investor
- Good Ventures Foundation existing investor
- Sam Altman existing investor
- Dustin Moskovitz
- SoftBank existing investor
Use of proceeds
What the money is for
According to the announcement, the money goes to hiring, product development, scaling operations and working capital.
- Hiring
- Product development
- Scaling operations
- Working capital
Comparable rounds
How it compares
The closest in time: Series F rounds in any sector within 6 months:
| Company | Announced | Amount | Post-money | Led by |
|---|---|---|---|---|
| Innovaccer Tech Companies | 9 Jan 2025 | $275M | $3.45B | B Capital |
| Loans & Financing | 11 Dec 2024 | $118M | not disclosed | Multiples |
| Tech Companies | 19 Feb 2025 | $75M | $1.00B | Lightrock |
| Tech Companies | 5 Feb 2025 | $65M | not disclosed | McVaney Investment Partnership |
| Quantexa Tech Companies | 5 Mar 2025 | $175M | $2.60B | Ontario Teachers’ Pension Plan |
| Medical Supply Manufacturers | 12 Mar 2025 | $65M | not disclosed | US Venture Partners |
| Tech Companies | 1 Nov 2024 | $25M | not disclosed | not named |
| Form Energy Batteries | 9 Oct 2024 | $405M | not disclosed | T. Rowe Price |
Sources
Where this comes from
Reported by 5 sources.
Questions
Frequently asked
How much did Helion raise in its Series F round?
Helion raised $425M in its Series F round, announced in Jan 2025.
Which investors took part in Helion's Series F round?
Lightspeed Venture Partners, SoftBank Vision Fund, Mithril, Capricorn Investment Group, Nucor and Good Ventures Foundation and 3 more.
What was Helion's valuation at the Series F round?
$5.42B post-money ($5.00B pre-money).
Did Helion raise again after this round?
Yes: a Series G round in Jun 2026 of $465M at $15.50B post-money.