Commonwealth Fusion Systems
Commonwealth Fusion Systems is a fusion energy company spun out of MIT in 2018. It builds high-temperature superconducting magnets and uses them in compact tokamak fusion machines. It is building SPARC, a demonstration machine in Devens, Massachusetts, meant to produce net energy from fusion, and is developing ARC, a planned commercial fusion power plant in Chesterfield County, Virginia.
Energy & climateFusion power plant and superconducting magnet developmentDevens, United States
FoundersSince 2018
- Bob MumgaardChief Executive Officer
- Brandon SorbomChief Science Officer
- Dan BrunnerChief Technology Officer
- Total raised
- $4.0B
- Last round · Jul 2026
- Equity financing ($1B, 2026)
- Founded
- 2018
- Employees
- 650
Funding rounds
DateRound · leadRaised
Jul 30, 2026Equity financing ($1B, 2026)$1.0B
Jun 11, 2026Strategic investment (Plynth Energy) · Plynth Energy—
Aug 28, 2025Series B2$863M
Dec 1, 2021Series B · Tiger Global Management$1.8B
Jun 27, 2019Series A$115M
Mar 9, 2018Initial investment (Eni) · Eni$50M
Team
- Bob MumgaardChief Executive Officer and Co-founder
- Brandon SorbomCo-founder and Chief Science Officer
- Dan BrunnerCo-founder and Chief Technology Officer
