# Helical Fusion funding: rounds and investors > Helical Fusion has raised $43M across 3 rounds since 2025. Investors include Plug and Play, Mizuho Capital and SBI Investment. Every round with its source. Source: https://millionrounds.com/company/helical-fusion (Millionrounds; every figure on the page links to its filing or article) Japan · [Series B startup](https://millionrounds.com/companies) # Who invested in *Helical Fusion* 3 rounds we have observed, with the 14 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it. Cleantech Energy Raised 1 month ago Funding summary Updated 26 Oct 2026 **$43M** raised across 3 rounds since 2025, from 3 sources **$5.6M** Series A **$17M** Grant **$20M** Series B - **Latest round:** Series B, $20M Oct 2026 - **Step-up i:** 1.2× - **Investors:** 14 See who backed them ## The funding story Each circle is a round, placed by date and sized by amount. The line above is the running total. 2026 **$5.6M** Series A **$17M** Grant **$20M** Series B - **First round:** Series A, $5.6M - **Biggest round:** $20M - **Usual gap between rounds:** 9 months ## The rounds - **Oct 2026** Series B **$20M** *8 new* [Fujikura](https://millionrounds.com/fund/fujikura) [Tokyo Gas](https://millionrounds.com/fund/tokyo-gas) [Ando & Hazama](https://millionrounds.com/fund/ando-and-hazama) [Fuji Electric](https://millionrounds.com/fund/fuji-electric) [KKT](https://millionrounds.com/fund/kkt) [Kepple Group](https://millionrounds.com/fund/kepple-group) [Urata](https://millionrounds.com/fund/urata) [eCrowd](https://millionrounds.com/fund/ecrowd) Reported by The Bridge - **Sept 2026** Grant **$17M** *1 new* *4 returning* [Plug and Play](https://millionrounds.com/fund/plug-and-play) [Mizuho Capital](https://millionrounds.com/fund/mizuho-capital) [SBI Investment](https://millionrounds.com/fund/sbi-investment) [Japan Finance Corporation](https://millionrounds.com/fund/japan-finance-corporation) [Nissay Capital](https://millionrounds.com/fund/nissay-capital) Source recorded - **Dec 2025** Series A **$5.6M** *5 new* [Plug and Play](https://millionrounds.com/fund/plug-and-play) [Mizuho Capital](https://millionrounds.com/fund/mizuho-capital) [SBI Investment](https://millionrounds.com/fund/sbi-investment) [Nissay Capital](https://millionrounds.com/fund/nissay-capital) [Keio Innovation Initiative](https://millionrounds.com/fund/keio-innovation-initiative-inc) 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. **Series A** 2025 **Grant** 2026 **Series B** 2026 [Plug and Play](https://millionrounds.com/fund/plug-and-play) [Mizuho Capital](https://millionrounds.com/fund/mizuho-capital) [SBI Investment](https://millionrounds.com/fund/sbi-investment) [Nissay Capital](https://millionrounds.com/fund/nissay-capital) [Japan Finance Corporation](https://millionrounds.com/fund/japan-finance-corporation) [Keio Innovation Initiative](https://millionrounds.com/fund/keio-innovation-initiative-inc) [Fujikura](https://millionrounds.com/fund/fujikura) [Tokyo Gas](https://millionrounds.com/fund/tokyo-gas) [Ando & Hazama](https://millionrounds.com/fund/ando-and-hazama) [eCrowd](https://millionrounds.com/fund/ecrowd) ## Everyone who backed them [Plug and Play](https://millionrounds.com/fund/plug-and-play) Accelerator **2** rounds [Mizuho Capital](https://millionrounds.com/fund/mizuho-capital) VC firm **2** rounds [SBI Investment](https://millionrounds.com/fund/sbi-investment) VC firm **2** rounds [Nissay Capital](https://millionrounds.com/fund/nissay-capital) VC firm **2** rounds [Japan Finance Corporation](https://millionrounds.com/fund/japan-finance-corporation) Investment firm **1** round [Keio Innovation Initiative](https://millionrounds.com/fund/keio-innovation-initiative-inc) VC firm **1** round [Fujikura](https://millionrounds.com/fund/fujikura) Corporate VC **1** round [Tokyo Gas](https://millionrounds.com/fund/tokyo-gas) Corporate VC **1** round [Ando & Hazama](https://millionrounds.com/fund/ando-and-hazama) Growth equity **1** round [eCrowd](https://millionrounds.com/fund/ecrowd) Growth equity **1** round [Fuji Electric](https://millionrounds.com/fund/fuji-electric) Corporate VC **1** round [Kepple Group](https://millionrounds.com/fund/kepple-group) Growth equity **1** round [KKT](https://millionrounds.com/fund/kkt) Growth equity **1** round [Urata](https://millionrounds.com/fund/urata) Growth equity **1** round Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=helical-fusion). ## Quick answers about Helical Fusion ### 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. ### 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. ## Companies like Helical Fusion In the same sector, and raised in the last eighteen months. [**Esa** $7.3M · Oct 2026](https://millionrounds.com/company/esa)[**ASTRA FOOD PLAN** $5.9M · Oct 2026](https://millionrounds.com/company/astra-food-plan)[**Kyoto Fusioneering** $1.3B · Aug 2026](https://millionrounds.com/company/kyoto-fusioneering)[**Beam Technologies** Jun 2026](https://millionrounds.com/company/beam-technologies)[**Clean Energy Connect** $146M · May 2026](https://millionrounds.com/company/clean-energy-connect)[**Sharing Energy** $26M · Apr 2026](https://millionrounds.com/company/sharing-energy) ## Find investors like these Search every investor by what they have actually funded, then narrow to your stage and market. Free. Open the investor searchOr these rounds in the app