Commonwealth Fusion Systems
Commonwealth Fusion Systems is a Cambridge, Massachusetts-based research and development company developing fusion power systems based on ARC tokamak reactors.
Seedtable Score
43
Startups
6
Funding Rounds
$3.0b
Money raised
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Funding
Funding series
Funding Series Analysis
The company Commonwealth Fusion Systems has raised a total of $2.71b in funding over 6 rounds.
Key Insights:
- Commonwealth Fusion Systems August 2025 Series B Funding Round: $863m
- Commonwealth Fusion Systems Series B round, December 1, 2021: $1.8b
- Commonwealth Fusion Systems Seed round, March 2018: $50m
- Commonwealth Fusion Systems Series A, June 2019: $115m
- Commonwealth Fusion Systems Series A round, May 2020: $84m
- Commonwealth Fusion Systems LLC funding round, June 2018: $100m
Commonwealth Fusion Systems August 2025 Series B Funding Round
$863m
Commonwealth Fusion Systems Series B round, December 1, 2021
$1.8b
Commonwealth Fusion Systems Seed round, March 2018
$50m
Commonwealth Fusion Systems Series A, June 2019
$115m
Commonwealth Fusion Systems Series A round, May 2020
$84m
Commonwealth Fusion Systems LLC funding round, June 2018
$100m
Industries
Commonwealth Fusion Systems is active in the following industries: