Japan · 
Who invested in Helical Fusion?
Helical Fusion's investors include Plug and Play, Mizuho Capital, SBI Investment, Nissay Capital and Japan Finance Corporation, and 9 more on record.
2026
$5.6MSeries A$17MGrant$20MSeries B
Japan · Series B startup
Who invested in Helical Fusion
Funding summaryUpdated 26 Oct 2026
$43Mraised across 3 rounds since 2025, from 3 sources
$5.6MSeries A$17MGrant$20MSeries B
- Latest round
- Series B, $20MOct 2026
- Step-upi
- 1.2×
- Investors
- 14
The funding story
Each circle is a round, placed by date and sized by amount. The line above is the running total.
- First round
- Series A, $5.6M Dec 2025
- Biggest round
- $20M Series B · Oct 2026
- Usual gap between rounds
- 9 months the median of 2
The rounds
- Oct 2026Series B$20M8 new
Reported by The Bridge
- Sept 2026Grant$17M1 new4 returning
Source recorded
- Dec 2025Series A$5.6M5 new
Source recorded
Who was in which round
The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.
Everyone who backed them
Nissay CapitalVC firm2rounds
Ando & HazamaGrowth equity1round
Kepple GroupGrowth equity1round
KKTGrowth equity1round
UrataGrowth equity1round
Missing a round, or an investor who was in one? Tell us.
Quick answers about Helical Fusion
How much has Helical Fusion raised?
Helical Fusion has raised $43M across 3 rounds since 2025.
When did Helical Fusion last raise?
Helical Fusion's most recent round was a Series B of $20M in Oct 2026.
What was Helical Fusion's biggest round?
Its most recent round, $20M in Oct 2026, is also its largest on record.
Who backed Helical Fusion first?
Helical Fusion's first round on record, in Dec 2025, was backed by Plug and Play, Mizuho Capital and SBI Investment and 2 others.
What stage is Helical Fusion at?
Helical Fusion's latest named round is a Series B, in Oct 2026.
Where is Helical Fusion based?
Helical Fusion is based in Japan.
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