COMPANY PROFILE · UPDATED 01 AUG 2026

Commonwealth Fusion Systems

Commonwealth Fusion Systems (CFS) is an American company founded in 2018 aiming to build a compact nuclear fusion power plant based on the ARC tokamak reactor concept. The company is based in Cambridge, Massachusetts, and is a spin-off of…

www.cfs.energy ↗

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Founded: 2018
Headcount: 722
Open roles: 104
Last raised: Series B · Sign in to view

TECH STACK

How Commonwealth Fusion Systems builds

Extracted from Commonwealth Fusion Systems’s job postings we’ve tracked

Programming Languages

Python×13 MATLAB×8 C++×3 Visual Basic for Applications×3

Analytics & BI

Sigma×18 Microsoft Excel×5

Other Software & Platforms

Microsoft Office×9 ANSYS×8 Siemens Teamcenter×4 Ansys HFSS×2

Design Tools

AutoCAD×11 SolidWorks×8 Altium Designer×3

Collaboration & Productivity

Jira×10 Confluence×5 Google Workspace×4 Atlassian×2

DevOps & Infrastructure

Linux×6

Frameworks & Libraries

Electron×4

AI & Machine Learning

Transformers×3

LEADERSHIP

Founders & key people

OPEN ROLES

Hiring at Commonwealth Fusion Systems

View all 104 open roles →

FUNDING

Capital raised

Total raised

$3,877,000,000

Investors

Khosla Ventures Quiet Capital Tiger Global Management Bill Gates Breakthrough Energy Breakthrough Energy Ventures Brevan Howard Asset Management Coatue Collaborative Fund Counterpoint Holdings DFJ Growth Management Department of Energy Devonshire Investors Emerson Collective Eni Eni Next Equinor Equinor Ventures Evolution VC Partners FFA Private Bank Fine Structure Venture FootPrint Coalition Future Ventures Galaxy Interactive Gates Frontier Fund Gigascale Capital Global Brain Google HELENA HOF Capital Hostplus JIMCO JSCapital John Doerr Larry Kubal Lowercarbon Capital Lowercase Capital Mitsubishi Corporation Management Mitsui & Co.Moore Strategic Ventures NVentures Neva SGR Planet First Partners Roman Smolevskiy Safar Partners Sand Hill Angels Schooner Capital Senator Investment Group Soros Fund Management Stanley Druckenmiller Starbridge Venture Capital Starlight Ventures Temasek The Engine Time Ventures Woori Venture Partners

Funding rounds

Series Unknown ↗
Announcement · cfs.energy
$1BJul 30, 2026
Series B
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NVentures, Emerson Collective, Planet First Partners, Lowercarbon Capital, Mitsubishi Corporation Management, Gigascale Capital, Counterpoint Holdings, Stanley Druckenmiller, Tiger Global Management, Breakthrough Energy Ventures, Galaxy Interactive, Brevan Howard Asset Management, Mitsui & Co., Khosla Ventures, Safar Partners, Eni, HOF Capital, Neva SGR, Future Ventures, Google, Woori Venture Partners, FFA Private Bank, Hostplus, Starlight Ventures, Gates Frontier Fund, Global Brain, Collaborative Fund, Evolution VC Partners
$863MAug 27, 2025
Grant
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Department of Energy
$15MJun 5, 2024
Series B
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Tiger Global Management, Senator Investment Group, Lowercarbon Capital, Coatue, Soros Fund Management, Future Ventures, Breakthrough Energy, FootPrint Coalition, Hostplus, Google, Starlight Ventures, Equinor Ventures, JIMCO, John Doerr, Moore Strategic Ventures, DFJ Growth Management, JSCapital, Safar Partners, Eni, Emerson Collective, Schooner Capital, Khosla Ventures, Temasek, The Engine, Fine Structure Venture, Time Ventures, Bill Gates, Sand Hill Angels, Starbridge Venture Capital, Quiet Capital, Larry Kubal, HELENA, Roman Smolevskiy
$1.8BNov 30, 2021
Series A
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Temasek, Future Ventures, Safar Partners, Starlight Ventures, Devonshire Investors, Eni Next, Hostplus, Khosla Ventures, Moore Strategic Ventures, The Engine, Equinor, Breakthrough Energy, Schooner Capital
$84MMay 25, 2020
Series A
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Breakthrough Energy, Schooner Capital, Safar Partners, Moore Strategic Ventures, Future Ventures, Starlight Ventures, Lowercase Capital, Khosla Ventures, The Engine, Eni Next
$115MJun 26, 2019

Funding data via Diffbot, SEC EDGAR filings and company announcements — each round names its source

Categorized in

Industry

Climate & Energy Clean Energy & Grid

Investors

Khosla Ventures Quiet Capital Tiger Global Management

Industries

Renewable Energy Companies Climate Companies Solar Energy Companies Energy Companies Wind Energy Companies

Collections

Has Woman Founder

Tech Stack

Python React Amazon Web Services C#C++Java Nodejs

LOCATIONS

Where they work

Commonwealth Fusion Systems offices

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Cambridge, MA148 Sidney Street
Devens, MA
Milpitas, CA
Somerville, MA

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