Stake Purchase • Energy Services and Equipment

Mitsui & Co Invests In Commonwealth Fusion Systems

On September 5, 2025, Mitsui & Co invested in energy services and equipment company Commonwealth Fusion Systems

Investment Context
  • This is Mitsui & Co’s 3rd transaction in the Energy Services and Equipment sector.
  • This is Mitsui & Co’s 18th transaction in the United States.
  • This is Mitsui & Co’s 2nd transaction in Massachusetts.

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Investment Summary

Date September 5, 2025
Target Commonwealth Fusion Systems
Sector Energy Services and Equipment
Investor(s) Mitsui & Co
Deal Type Stake Purchase

Target Company

Commonwealth Fusion Systems

Devens, Massachusetts, United States
Commonwealth Fusion Systems is an energy technology company focused on developing commercial nuclear fusion power plants. Commonwealth Fusion Systems was founded in 2018 and is based in Devens, Massachusetts.
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Investor Overview 1

Investor

Mitsui & Co

Tokyo, Japan

Category Company
Founded 1947
Sector Diversified
Employees56,400
Revenue 14.66T JPY (2025)
DESCRIPTION

Mitsui & Co engages in the export, import, wholesale, and retail of steel products; steel processing; mining and sale of iron ores; and sale and trading of ferrous scrap and alloy products and chemicals, energy, food, food & retail management, healthcare & service, consumer business, IT & communication business, corporate development business. Mitsui & Co was founded in 1947 and is based in Tokyo, Japan.


Deal Context for Investor #
Overall 50 of 52
Sector: Energy Services and Equipment 3 of 3
Type: Stake Purchase 17 of 18
State: Massachusetts 2 of 2
Country: United States 18 of 19
Year: 2025 2 of 4
PREVIOUS DEAL
DATE TARGET DEAL TYPE VALUE
2025-04-16 Infinium

Sacramento, California, United States

Infinium is a provider of gas conversion solutions and developer of eFuels technology and projects. Infinium is based in Sacramento, California.

Buy -
FOLLOWING DEAL
DATE TARGET DEAL TYPE VALUE
2025-09-15 Lokavant

New York, New York, United States

Lokavant is a clinical intelligence platform that improves the time, cost, and quality of trial planning and execution through data-driven analytics applications. Lokavant's platform aggregates and integrates real-time data from disparate trial data sources, and powers advanced analytics enabled by its compendium of proprietary trial data. Lokavant was founded in 2020 and is based in New York, New York.

Sell -