MiRESSO
MiRESSO is a climate tech company in Misawa, Japan, founded in 2023. It has raised $31.6M across 3 rounds, most recently a $17.9M Series A in February 2026.
Bring out the potential of mineral resources and connect a bright future to the next generation
- Headquarters
- Misawa
- Employees
- 1–10
- Founded
- 2023
- Business Model
- B2B
- Website
- miresso.co.jp
- Total Funding
- $31.6M
- Last Round
- $17.9M Series AFeb 2026
- Rounds
- 3
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
Indexed holds 3 funding rounds and 5 investors for this company. The full record is or through the API.
About
MiRESSO Co., Ltd. is a Japanese fusion startup spun out of the National Institutes for Quantum Science and Technology (QST), focused on securing a stable and cost-competitive supply of beryllium — a rare mineral critical to nuclear fusion reactors. Founded in May 2023 by Dr. Masaru Nakamichi, a former QST fusion blanket engineer, the company is developing a novel low-cost beryllium refining process to enable commercial fusion energy. MiRESSO has raised over JPY 6.68 billion in Series A financing and is backed by investors including Mitsui and MPower Partners. It holds QST certification and is headquartered in Misawa, Aomori, Japan, near the Rokkasho Research Institute.
Summary
It lists 1–10 employees. It has raised $31.6M in total across 3 rounds, most recently a $17.9M Series A round in Feb 2026. Investors include Spiral Ventures, Genesia Ventures and SBI Investment.
Tech & App Stack
4 technologies & apps tracked
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Funding History
Feb 2026
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Funding: Seed through Series A. Amounts, valuations, and investors where available.
Investors
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