Private investment in fusion reached a new high in 2026. The Fusion Industry Association's 2026 report found that 56 surveyed fusion companies raised $4.48 billion in the 12 months leading to July 2026, 69% more than the previous annual total. Cumulative funding reported through the survey reached $14.24 billion, while employment across the industry exceeded 16,000 people.
The funding picture has continued to move since that report. Commonwealth Fusion Systems announced another $1 billion equity raise on July 30, bringing its own total capital raised to $4 billion.
Fusion is moving from a research-driven field toward a more industrial phase, with growing investment in reactor development, advanced magnets, laser systems, manufacturing facilities, and future power plants. Recent funding and engineering activity reflect increasing confidence that fusion could eventually become a source of firm, low-carbon electricity, although commercial fusion power has not yet been delivered to the grid. The next phase of the industry will depend on whether developers can translate scientific progress into reliable, scalable, and economically viable power systems.
Key Takeaways
- Fusion companies raised a record $4.48 billion in the 12 months leading to July 2026, according to the Fusion Industry Association
- Commonwealth Fusion Systems has now raised $4 billion, including another $1 billion announced in July 2026
- Helion reached a $15.5 billion post-money valuation after raising $465 million in June 2026
- European fusion investment accelerated, led by Proxima Fusion's €411 million round and Focused Energy's $240 million Series A
- Commercial progress is increasingly measured through engineering execution, including machine construction, magnet production, facility expansion, grid planning, and customer agreements
Understanding the Fusion Technology Landscape
Fusion releases energy by combining light atomic nuclei. Most commercial concepts aim to create and control extremely hot plasma long enough for fusion reactions to occur at useful rates.
Unlike conventional nuclear fission, fusion does not rely on a self-sustaining chain reaction or produce spent nuclear fuel in the same way. Fusion facilities can still involve radiological engineering challenges, including tritium management and materials activated by high-energy neutrons.
The companies on this list pursue several approaches:
- Tokamaks: Magnetic-confinement devices used by Commonwealth Fusion Systems, Energy Singularity, and Startorus Fusion
- Stellarators: Magnetic systems designed for steady-state operation, pursued by Proxima Fusion and Thea Energy
- Laser inertial fusion: High-powered lasers compress small fuel targets, the approach being commercialized by Inertia and Focused Energy
- Pulsed approaches: Helion and Pacific Fusion use distinct pulsed architectures rather than conventional tokamak or stellarator designs
The National Ignition Facility has demonstrated fusion target energy gain using laser-driven inertial confinement, but translating scientific gain into economical, continuously operating electricity production remains a much larger engineering challenge.
1. Commonwealth Fusion Systems
Co-Founder and CEO: Bob Mumgaard
Headquarters: Devens, Massachusetts
Latest Funding: $1 billion equity financing in July 2026
Total Capital Raised: $4 billion
Latest Growth Evidence
Commonwealth Fusion Systems raised another $1 billion on July 30, 2026, following its $863 million Series B2 in 2025. The new financing brought total capital raised to $4 billion and will support completion of SPARC alongside development of the company's first planned ARC power plant.
CFS has also entered the PJM grid-interconnection process for its planned Virginia plant and secured future power agreements with Google and Eni. Google has committed to purchase 200 MW from the first ARC facility.
What the Company Builds
CFS is developing high-field tokamaks based on high-temperature superconducting magnets. SPARC is designed to demonstrate net fusion energy, while the planned ARC system is intended to convert fusion heat into grid electricity.
Why It Matters
CFS combines one of the industry's largest private capital bases with active machine construction, grid planning, and future power commitments. These milestones make it one of the clearest examples of fusion moving from laboratory development toward power-plant engineering.
2. Helion Energy
Founder and CEO: David Kirtley
Headquarters: Everett, Washington
Latest Funding: $465 million Series G in June 2026
Total Capital Raised: $1.5 billion
Latest Growth Evidence
Helion raised $465 million in June 2026 at a $15.5 billion post-money valuation. The company said the financing would expand U.S. manufacturing capacity and support commercial deployment.
Helion is also constructing its Orion facility in Malaga, Washington, while its Polaris prototype became the first privately funded fusion machine that the company reports has operated with deuterium-tritium fuel.
What the Company Builds
Helion uses a pulsed field-reversed configuration that forms, accelerates, and compresses plasma during repeated pulses. Its power-plant concept differs from conventional steam-cycle fusion designs by aiming to recover electricity directly from changes in the magnetic field.
Why It Matters
Helion has paired an alternative fusion architecture with one of the sector's highest private valuations and a future power agreement with Microsoft. Its aggressive delivery targets remain dependent on substantial technical execution, but construction and financing provide tangible evidence of continued scale-up.
3. Proxima Fusion
Co-Founder and CEO: Francesco Sciortino
Headquarters: Munich, Germany
Latest Funding: €411 million in July 2026
Valuation: €2.4 billion
Latest Growth Evidence
Proxima Fusion raised €411 million in July 2026, bringing its secured financing and public grants to more than €650 million. The company plans to use the capital to advance its Alpha demonstrator, expand high-temperature superconducting magnet capabilities, and grow engineering and manufacturing operations.
The round included strategic investment from Google and German utility RWE.
What the Company Builds
Proxima develops quasi-isodynamic stellarators based partly on research from Germany's Max Planck Institute for Plasma Physics. Stellarators use complex magnetic fields to confine plasma without relying on the large plasma current used in conventional tokamaks.
Why It Matters
Proxima has rapidly become one of Europe's most heavily funded private fusion companies. Its growth also gives the stellarator approach a well-capitalized commercial development program alongside larger tokamak initiatives.
4. Inertia
Co-Founder and CEO: Jeff Lawson
Headquarters: Livermore, California
Latest Funding: $450 million Series A in February 2026
Founded: 2024
Latest Growth Evidence
Inertia raised $450 million in Series A financing in February 2026 and subsequently entered a broad research partnership with Lawrence Livermore National Laboratory. The agreement includes collaborative development work and access to a portfolio of nearly 200 inertial-fusion patents, including exclusive rights to selected technologies.
What the Company Builds
Inertia is developing laser-driven inertial fusion based on physics demonstrated at the National Ignition Facility. Its development program includes a planned high-power laser system called Thunderwall and manufacturing processes for producing fusion fuel targets at high volume.
Why It Matters
Inertia is attempting to commercialize the fusion approach that has already demonstrated target-level scientific energy gain at a national laboratory. The central challenge is now engineering a system that can repeat the process efficiently and economically enough for power production.
5. Pacific Fusion
Co-Founders: Eric Lander, Will Regan, Keith LeChien, Carrie von Muench, and Leland Ellison
Headquarters: San Francisco Bay Area
Recent Capital: More than $1 billion in private capital reported by July 2026
Founded: 2023
Latest Growth Evidence
Pacific Fusion reported completing another set of engineering milestones in June 2026 after validating a scaled prototype of its pulsed-power module. By July, the company said it had raised more than $1 billion in private capital and was preparing to break ground on its Demonstration System in Albuquerque, New Mexico.
The company has also expanded to more than 200 employees and is developing manufacturing operations in California and New Mexico.
What the Company Builds
Pacific Fusion is developing pulser-driven inertial fusion. Its architecture uses synchronized high-current electrical pulses to magnetically compress small fuel targets to fusion conditions.
Why It Matters
Pacific Fusion is designing its system around modular manufacturing as well as fusion performance. Its New Mexico expansion and scaled pulsed-power testing provide measurable engineering milestones ahead of its planned net-facility-gain demonstration.
6. Focused Energy
Co-Founder and CEO: Thomas Forner
Headquarters: Darmstadt, Germany
Latest Funding: $240 million Series A in May 2026
Founded: 2021
Latest Growth Evidence
Focused Energy raised $240 million in May 2026 to advance its laser-fusion program. Investors included RWE, SPRIND, the European Innovation Council Fund, and Prime Movers Lab.
The company is developing its industrial program around the former Biblis nuclear power plant site in Germany and reports a team of more than 160 scientists and engineers.
What the Company Builds
Focused Energy is developing laser-driven inertial fusion using high-energy lasers to compress fusion targets. Its work focuses on translating inertial-fusion physics into a repeatable system suitable for future power generation.
Why It Matters
Focused Energy gives Europe a significant private program focused specifically on laser fusion. Its financing and planned Biblis development also connect fusion research with an existing large-scale energy site and utility partner.
7. SHINE Technologies
Founder and CEO: Greg Piefer
Headquarters: Janesville, Wisconsin
Latest Funding: $240 million equity financing in February 2026
Total Funding: More than $1 billion
Latest Growth Evidence
SHINE raised $240 million in equity financing in February 2026, bringing total funding above $1 billion. In April, it also received a conditional commitment for a $263 million U.S. Department of Energy loan to support its Chrysalis medical-isotope facility.
What the Company Builds
SHINE applies fusion-generated neutrons to commercial applications including materials testing and medical-isotope production. Its longer-term development roadmap extends toward nuclear fuel recycling and eventually fusion energy.
Why It Matters
SHINE differs from power-first fusion startups because parts of its fusion technology already support commercial products and services. That revenue-oriented path provides an example of fusion technology creating nearer-term industrial value before grid electricity.
8. Startorus Fusion
Founder and CEO: Chen Rui
Headquarters: Shanghai, China
Latest Funding: RMB 880 million Series A++ in August 2026
Founded: 2021
Latest Growth Evidence
Startorus completed an RMB 880 million Series A++ round in August 2026. The financing followed an RMB 1 billion Series A earlier in the year and an RMB 500 million Series A+ in May.
The capital is supporting development of the company's Shanghai experimental base, NTST device, future CTRFR-1 system, superconducting magnets, and AI-assisted plasma control.
What the Company Builds
Startorus develops compact spherical tokamak systems with high-temperature superconducting magnets. Its engineering program includes experimental fusion machines, plasma-control technology, magnet systems, and supporting reactor components.
Why It Matters
Startorus illustrates the rapidly expanding private fusion ecosystem in China. Multiple funding rounds in 2026, together with construction of new experimental infrastructure, indicate increasing capital deployment around China's commercial fusion programs.
9. Energy Singularity
Founder and CEO: Yang Zhao
Headquarters: Shanghai, China
Latest Funding: Series A completed in February 2026, amount undisclosed
Founded: 2021
Latest Growth Evidence
Energy Singularity completed a Series A financing round in February 2026. The same month, its HH70 all-high-temperature-superconducting tokamak achieved a reported 1,337-second steady-state long-pulse plasma operation.
In June, the company announced successful development and operation of a 26.7-tesla cryogen-free insulated high-temperature superconducting magnet.
What the Company Builds
Energy Singularity develops compact high-field tokamaks based on high-temperature superconducting magnets alongside plasma-control software and supporting reactor technology.
Why It Matters
Energy Singularity combines machine operation with advanced magnet development, two areas that are central to high-field tokamak engineering. Its 2026 milestones provide a clearer growth signal than funding alone.
10. Thea Energy
Co-Founder and CEO: Brian Berzin
Headquarters: Kearny, New Jersey
Latest Funding: $100 million Series B in May 2026
Recent Public Award: $20 million ARPA-E SCALEUP award in July 2026
Latest Growth Evidence
Thea Energy raised $100 million in Series B financing in May 2026 to expand magnet manufacturing and advance construction of its Eos integrated stellarator. The company said it also planned to double its team during this development phase.
In July, the company announced a $20 million ARPA-E SCALEUP award to establish additional domestic manufacturing capacity for its modular high-temperature-superconducting magnets.
What the Company Builds
Thea Energy is developing a stellarator architecture that replaces conventionally complex three-dimensional stellarator coils with arrays of simpler planar magnets controlled through software.
Why It Matters
Thea is tackling one of the stellarator's longstanding engineering challenges: magnet complexity. Its current funding is moving that concept into larger magnet-manufacturing and integrated-machine programs.
How Landbase Helps GTM Teams Map the Fusion Supply Chain
Fusion is not one buyer category. A reactor developer can create demand across superconducting materials, industrial equipment, electronics, software, precision manufacturing, construction, engineering services, and specialized talent.
Landbase helps GTM teams research that emerging ecosystem around the signals and company characteristics most relevant to their market.
Follow Capital Into Buildout
A large financing round becomes more useful when viewed alongside what the company is building next.
Teams can combine recent funding activity with evidence such as:
- New research or manufacturing facilities
- Major machine-construction programs
- Hiring across engineering and operations
- Utility or customer agreements
- Government development awards
- Geographic expansion
- New supplier and industrial partnerships
This helps distinguish a funded research company from an account actively moving into a more infrastructure-intensive stage.
Map the Technology Ecosystem
Standard industry classifications do not neatly separate tokamak developers from stellarator companies, laser-fusion startups, magnet manufacturers, or fusion-adjacent suppliers.
Landbase's advanced dataset creation can support more specific market definitions based on technology, geography, company characteristics, and other requirements.
That creates a more useful starting point for suppliers whose addressable market depends on how each fusion company is actually building its system.
Expand Around High-Priority Accounts
Major fusion developers can serve as anchor accounts for discovering adjacent companies.
With similar-company research, teams can start from selected companies and look for organizations with related characteristics. The resulting audience can then be refined by geography, size, technology, funding, or another relevant criterion.
For fusion, this can be especially useful when searching beyond the most visible reactor developers into the surrounding engineering and supply-chain ecosystem.
Build the Stakeholder Map
Fusion projects involve technical and commercial decisions across many functions.
Depending on the offer, relevant contacts may include:
- Engineering and manufacturing leaders
- Supply-chain and procurement teams
- Facilities and construction leadership
- Corporate development and partnerships
- Finance and operations executives
- Technical program and project leaders
Landbase's decision-maker workflow can help connect target accounts with people relevant to the specific buying decision rather than relying on a generic executive-title list.
Put the Research Into the CLI
The Landbase CLI brings audience creation, matching, enrichment, dataset management, and structured exports into environments such as Claude Code and Codex.
For technical GTM teams, a fusion market map can become a reusable workflow. Accounts can be revisited as funding closes, facilities move into construction, new partnerships appear, or technical programs enter another stage.
Frequently Asked Questions
What makes a nuclear fusion company fast-growing?
Fusion-company growth can be measured through funding, hiring, facility construction, machine-development milestones, government awards, and future commercial agreements. Revenue is less useful across much of the sector because most fusion power developers are still pre-commercial. No common public dataset allows every private fusion company to be ranked consistently on one growth metric. A broader fusion market mapping process therefore benefits from combining financial and operating indicators.
Has any company generated commercial electricity from nuclear fusion?
No company on this list is currently supplying commercial fusion electricity to the grid. Several have future power-plant plans or customer agreements, but those depend on technical and engineering milestones that have not yet been completed. The National Ignition Facility has demonstrated scientific fusion energy gain at the target level, which is different from a power plant producing net electricity. Commercial electricity production remains a future objective for the industry.
Which fusion technology is closest to commercialization?
There is no definitive answer because different approaches are attempting to solve different scientific and engineering challenges. Tokamaks have the largest experimental knowledge base, while inertial fusion has demonstrated target-level scientific energy gain and stellarators offer potential steady-state operating advantages. Helion and Pacific Fusion are pursuing additional pulsed architectures. Current financing and construction activity suggest several approaches remain credible enough to attract substantial capital.
Why are technology companies interested in fusion power?
Large technology companies operate data centers with significant and growing electricity requirements, creating interest in additional sources of firm, low-carbon power. Google has entered future power agreements with CFS, while Microsoft has an agreement with Helion. These commitments provide demand signals but remain dependent on the fusion developers successfully building and operating future plants. GTM teams researching similar changes can use technology adoption signals alongside other account activity.
How can Landbase help research the fusion industry?
Landbase can help teams define fusion audiences beyond a broad industry label, expand from known companies, incorporate current company signals, and identify relevant contacts. Existing market maps or conference lists can also be processed through file matching and enrichment instead of being rebuilt manually. This is useful in fusion because the market includes reactor developers, suppliers, engineering partners, advanced-material companies, and infrastructure providers. The CLI makes those workflows accessible from AI-assisted technical environments where the research can be updated as the market changes.
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