Fundraising Fox

MiRESSO

Misawa, JP · 8 known investors

Miresso develops beryllium materials and supply chain solutions for fusion energy applications. The company aims to enable stable beryllium supply for commercial fusion reactor deployment.

Deep TechEnergyNew Materials

Founders & leadership

MN
Masaru NakamichiCEO
YN
Yu NakanoTechnical Development Director

Investors · 8

Global BrainTokyo · $100K – $184M
Keio Innovation InitiativeTokyo · $1.5M – $64M
MPower
NTT DOCOMO VenturesTokyo
Spiral CapitalTokyo · $900K – $184M
Spiral Innovation Partners
Genesia Venturesreported · 3 sourcesTokyo · $774K – $50M
SBI InvestmentreportedTokyo · $2M – $227M

Funding

SEC filings, press & company announcements

$12M disclosed across 1 of 3 rounds · 2024–2026

Source: company announcements and press reports — follow each round's link for the claim.

In the news

MiRESSO, a Fusion Power Material Company, Raises Final ¥42.3 Billion in Series A Roundthebridge.jp · Mar 2026Nuclear fusion startup MiRESSO raises 1.83 billion yen in Series A funding to build demonstration plant – BRIDGEthebridge.jp · Aug 2025Fusion Startup MiRESSO Raises 1.83 Billion Yen (Approx. USD 12M) in Series A 1st Closejapanstartupobserver.substack.com · Aug 2025MiRESSO Raises ¥1.83bn Series A | FusionXInvestfusionxinvest.com · Aug 2025MiRESSO | FusionXInvestfusionxinvest.com · Aug 2025Seed Round Investment in Fusion Energy startup MiRESSO | Genesia Ventures, Inc.genesiaventures.com · Mar 2024

Frequently asked questions

What does MiRESSO do?
Miresso develops beryllium materials and supply chain solutions for fusion energy applications. The company aims to enable stable beryllium supply for commercial fusion reactor deployment.
Who are MiRESSO's investors?
MiRESSO's investors include Global Brain, Keio Innovation Initiative, MPower, NTT DOCOMO Ventures, Spiral Capital, Spiral Innovation Partners, Genesia Ventures, SBI Investment.
How much funding has MiRESSO raised?
MiRESSO has disclosed $12M raised across 1 of its 3 known rounds.
Where is MiRESSO headquartered?
MiRESSO is headquartered in Misawa, JP.