Commonwealth Fusion Systems · Jul 2026
CFS became the first international company in UKAEA’s LIBRTI program, gaining access to blanket-testing infrastructure to validate ARC tritium-blanket design and net tritium production.
Company research
Public company, workplace, funding, and market signals
Updated Jul 29, 2026
Overview
MIT spinout and privately held energy-technology company building commercial fusion systems with high-temperature superconducting magnets; flagship SPARC demonstration machine is intended to validate net-energy fusion and pave the way for ARC power plants.
Primary product
SPARC tokamak fusion demonstration machine
Founded
2018
Headquarters
Devens, Massachusetts, United States
Team size
501-1000
Industry
Energy Technology
Sub-industry
Fusion Energy
Offices
117 Hospital Rd, Devens, MA 01434
148 Sidney Street, Cambridge, MA
Business model
Long-term power purchase agreements for future fusion electricity
High-temperature superconducting magnet manufacturing and supply
Funding
Stage
Series B2
Total raised
$2.9B
Latest round
Series B2 · Aug 2025
Latest amount
$863M
Aug 2025 · Not disclosed
Jun 2024 · U.S. Department of Energy
People & investors
Leadership
Chief Executive Officer and Co-founder
Chief Science Officer and Co-founder
Chief Global Affairs Officer
Work & culture
Mission-driven, fast-paced, and autonomy-oriented; public culture signals emphasize integrity, execution, impact, self-critique, diversity, and responsible AI use.
Compensation
Public careers pages promise competitive compensation with equity; some Lever postings publish salary ranges and mention equity and benefits.
Benefits
Competitive compensation with equity
13 company-wide holidays
Flexible vacation days
10 sick days
Generous parental leave policy
Health insurance
Product & market
Pricing
Not publicly standardized; CFS appears to monetize through long-term PPAs/offtake contracts for future electricity, plus magnet supply and technology licensing while the company is still pre-commercial.
Differentiators
- —High-temperature superconducting magnet technology developed with MIT
- —Compact tokamak approach designed to lower cost and size versus legacy fusion concepts
- —SPARC as a commercially relevant net-energy demonstration machine
- —ARC as the planned grid-scale commercial power plant
- —Vertical integration of magnet R&D, manufacturing, and plant development
- —Peer-reviewed physics validation and major commercial counterparties already signed
Technology
High-temperature superconducting magnets
Scale & contact
Estimated revenue
USD 1M-$10M
Estimated monthly visits
20.2K
Traffic estimate as of Jun 2026
Latest news
Commonwealth Fusion Systems · Jun 2026
CFS said Abu Dhabi government-owned fund Plynth Energy acquired a minority stake, adding another strategic backer as the company moves toward commercialization.
Commonwealth Fusion Systems · Jun 2026
CFS published five peer-reviewed Journal of Plasma Physics papers validating ARC physics, co-authored by 58 scientists, strengthening the technical basis for the first commercial plant.
Open Positions
60 jobs at Commonwealth Fusion
Senior Manager, Manufacturing Engineering
On-siteCorporate OperationsDevens, MAToday
On-site