Founded in May 2023 and headquartered in Misawa, Aomori Prefecture, MiRESSO is building a beryllium manufacturing and sales business based on an innovative low-temperature purification process originally spun out of QST research. The company targets the critical need for a stable domestic supply of beryllium, an essential neutron-multiplying material for commercial fusion reactors, while also offering its purification method as a technology platform for recycling and refining a wider range of mineral resources. MiRESSO is constructing the BETA (Beryllium Testing plant in Aomori) pilot plant on Pacific Metals’ site in Hachinohe, aiming to begin production during fiscal 2027. Over roughly three years since inception, the startup has raised about ¥4.48 billion in equity and approximately ¥6.68 billion when government grants are included. Funds from the latest round will accelerate pilot-plant build-out, secure raw-material supply, and enhance product quality to establish a new beryllium supply chain in Japan.

Total raised

$41M

Funding rounds

3

Latest round

Series A

Latest activity

Feb 2026