Commonwealth Fusion

Commonwealth Fusion is a technology company.

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Updated: Dec 11, 2025 ·

Recent News & Mentions

Jun 1, 2019FundingCommonwealth Fusion - Series A

Financial History

Commonwealth Fusion has raised $120.0M across 1 funding round. Most recently, it raised $120.0M Series A in June 2019.

Total Raised

$120.0M

Valuation

N/A

Funding Rounds Raised

Date	Round	Lead Investors	Other Investors
Jun 1, 2019	$120.0M Series A		1435 Capital Management, Aglae Ventures, Somesh Surapureddi, DFJ, E1 Ventures, Family Office, Future Ventures, Gigafund, GoAhead Ventures, Lakeside Capital, Litquidity Ventures, Long Journey Ventures, Malex Enterprises, Partners Resolute, Social Capital, Space Capital, Starbridge Venture Capital, UpHonest Capital, Adeel Hussain, Fanny Surjana, Ishani Patel, Louis Beryl, Mattia Astori, Priyank Chandra, Rashaun Williams, Richard Cooperstein, Scott Banister, Shane Neman, Siddharth Singhal, Tim Ringel, Vikas Sabnani

Financial History

Commonwealth Fusion has raised $120.0M across 1 funding round.

Total Raised

$120.0M

Valuation

N/A

Deep Dive

High-Level Overview

Commonwealth Fusion Systems (CFS) is a fusion power company developing compact fusion energy systems using high-temperature superconducting (HTS) magnets to enable commercial-scale fusion power plants. It builds the SPARC tokamak, a net-energy fusion device, and plans the ARC tokamak as a grid-connected power plant, serving global energy needs by providing safe, unlimited, carbon-free electricity to replace fossil fuels like coal and natural gas.[1][2][3][6]

CFS addresses the critical gap in clean energy supply amid rising demand and climate challenges, with strong growth momentum: founded in 2018, it has raised over $2 billion—the most of any fusion company—grown to 350+ employees by 2022, opened its Devens, Massachusetts campus in 2023, and begun SPARC construction after demonstrating a 20 Tesla HTS magnet in 2021.[1][2]

Origin Story

CFS spun out from MIT's Plasma Science and Fusion Center (PSFC) in 2018, founded by MIT alumni including CEO Bob Mumgaard, Chief Science Officer Brandon Sorbom, and others like Zach Hartwig and Dan Brunner, who formed the "SPARC Underground" grassroots group.[1][3] The idea emerged from decades of MIT fusion research, particularly the ARC tokamak concept by Dennis Whyte's team, combined with breakthroughs in HTS magnets that enable smaller, more powerful fusion devices; rather than seeking federal grants, they pursued private capital for speed.[1][2][3]

Early traction came swiftly: $50 million from Eni in 2018, followed by a $115 million Series A in 2019 from Breakthrough Energy Ventures (Bill Gates), Khosla Ventures, and others; a landmark 20 Tesla magnet demo in 2021; and $1.8 billion Series B in late 2021 from Temasek, Google, Gates, and Eni to fund SPARC.[1][2]

Core Differentiators

HTS Magnet Technology: CFS's core innovation uses high-temperature superconductors for magnets generating 20 Tesla fields—stronger and more compact than traditional low-temperature superconductors—enabling smaller tokamaks like SPARC (net energy demo) and ARC (power plant).[1][2][3]
MIT-PSFC Partnership: Retains close ties with MIT researchers (e.g., Whyte, Greenwald) for R&D in MIT facilities, blending academic rigor with startup agility.[1][3]
Private Funding Scale: Over $2B raised, dwarfing peers, supporting rapid scaling without heavy reliance on government subsidies (though participating in DOE's INFUSE).[1][2][5]
Milestone-Driven Execution: Delivered world's strongest HTS magnet ahead of schedule; SPARC construction underway at Devens campus with manufacturing, offices, and research; safety-first tritium handling.[1][5]
Talent and Ecosystem: Attracts top experts; leads Fusion Industry Association efforts; builds global supplier networks for fusion rollout.[1][2]

Role in the Broader Tech Landscape

CFS rides the clean energy transition trend, targeting fusion as the "holy grail" for limitless, carbon-free power from abundant hydrogen isotopes, potentially displacing fossil fuels and enabling net-zero grids.[2][3][6] Timing is ideal amid accelerating climate urgency, AI-driven energy demand, and HTS material advances that finally make compact fusion viable after decades of research.[1][2]

Market forces favor CFS: private capital enthusiasm (e.g., Gates, Google), policy support like DOE INFUSE, and competition from peers like TAE Technologies, but CFS leads in funding and magnets.[1][4] It influences the ecosystem by sharing progress, fostering industry collaboration via the Fusion Industry Association, and proving fusion's commercial path—paving for a full fusion sector.[1][2]

Quick Take & Future Outlook

CFS aims to demonstrate net energy with SPARC by late 2020s, followed by ARC power plants on grids within 10-15 years, scaling to commercial fusion globally.[1][2][3] Trends like HTS improvements, AI-optimized plasma control, and falling renewable costs will accelerate this, though challenges remain in tritium safety and supply chains.[5]

Its influence will grow as the fusion frontrunner, potentially unlocking energy abundance if SPARC succeeds, drawing more investment and talent while catalyzing a fusion industry to bridge humanity's energy gap.[2][6]

Sources

Frequently Asked Questions

How much funding has Commonwealth Fusion raised?

Commonwealth Fusion has raised $120.0M in total across 1 funding round.

Who are Commonwealth Fusion's investors?

Commonwealth Fusion's investors include 1435 Capital Management, Aglae Ventures, Somesh Surapureddi, DFJ, E1 Ventures, Family Office, Future Ventures, Gigafund, GoAhead Ventures, Lakeside Capital, Litquidity Ventures, Long Journey Ventures.