Seventeen privately founded fusion companies meet a strict “more than $100 million” test as of August 15–16, 2026. The figures below are reported committed private capital, not a ranking of cash in the bank, company valuation, government grants or technical readiness. No private company has yet demonstrated a commercial fusion plant delivering dependable grid electricity.
The list follows the August 2026 TechCrunch/FusionX tally, with accounting conflicts and scope decisions identified rather than averaged away.
How “over $100 million” is defined
A company qualifies if it is privately founded, has a material business developing, supplying or enabling commercial fusion, and has reported more than $100 million in committed private capital. Exactly $100 million does not qualify. A valuation, an unclosed fundraising target, a government grant or a public-market transaction is not silently counted as venture funding.
- Committed capital: announced private financing, which may include money payable in stages.
- Invested capital: cash the company specifically says it has received; this can be lower than committed capital.
- Grants: shown separately because public funding is not private investment.
- Public proceeds: separated from a company’s earlier startup fundraising.
- Scope: reactor developers, a fusion-equipment supplier and a fusion-enabled commercial platform are all included, but labeled.
Chinese companies are not included because the boundary between private, state-backed and registered capital is difficult to verify consistently. The Fusion Report’s methodology makes the same exclusion.
#1 Best Overall
The 17 qualifying companies
Amounts are approximate committed private capital from the TechCrunch/FusionX update unless a different basis is stated. They are not directly comparable across companies.
| Company | Reported private capital | Approach | What it is building or selling |
|---|---|---|---|
| Commonwealth Fusion Systems | $3.94 billion | High-field tokamak | SPARC, with a company target of scientific breakeven around 2027, followed by a planned 400-MW ARC plant. |
| Helion Energy | $3.2 billion committed; $1.5 billion invested according to Helion | Field-reversed configuration / magneto-inertial fusion | Targets electricity production for Microsoft in 2028; that is a company target, not a demonstrated result. |
| TAE Technologies | $1.65 billion before its proposed merger | Field-reversed configuration with particle-beam stabilization | Fusion development since 1998; announced a proposed all-stock combination with Trump Media & Technology Group. |
| Pacific Fusion | More than $1 billion announced | Pulsed inertial confinement using electromagnetic pulses | Series A is milestone-based, so the headline commitment is not necessarily cash already received. |
| Proxima Fusion | More than $682.9 million | Stellarator | Developing the Alpha demonstrator and later Stellaris commercial plant; another tally put lifetime funding near $668 million. |
| SHINE Technologies | About $1 billion | Fusion-enabled neutron, isotope and waste applications | Has nearer-term commercial businesses and has not selected a specific future fusion-reactor design. |
| Inertia Enterprises | $450 million | Laser inertial confinement | Emerged from stealth in February 2026 with a Bessemer-led Series A; its team includes National Ignition Facility expertise. |
| General Fusion | More than $442 million in FusionX data | Magnetized target fusion | Uses liquid-metal compression and pistons; later Nasdaq and financing activity must be separated from private startup capital. |
| Zap Energy | About $325 million | Sheared-flow-stabilized Z-pinch | Has expanded partly into fission and hybrid fusion-fission systems. |
| Tokamak Energy | $284 million | Compact spherical tokamak and high-temperature superconducting magnets | Reported a 100-million-degree-Celsius ST40 plasma in 2022 and is developing a magnet business, including work connected with the U.K. STEP program. |
| Focused Energy | $277 million in TechCrunch/FusionX data; $415 million in another June tally | Laser inertial confinement | Raised a $240-million Series A and is pursuing industrial-scale fuel-target manufacturing; reported grants are separate. |
| Marvel Fusion | $208 million | Laser inertial confinement with silicon-nanostructured targets | Building a demonstration facility with Colorado State University, targeted by the company for operation in 2027. |
| Type One Energy | $174.5 million | Stellarator | Plans to sell technology to utilities; its proposed $250-million Series B was still in progress and is not counted. |
| Kyoto Fusioneering | $121 million in FusionX data; $191 million in another tally | Fusion plant equipment and balance of plant | Supplies plasma-heating, heat-extraction and integration systems rather than one reactor concept. |
| First Light Fusion | $140 million | Projectile-driven inertial confinement and pulsed power | Moved away from its earlier two-stage-gun plan and presents its technology for power, science and defense uses. |
| Thea Energy | $120 million | Software-defined stellarator | Crossed the threshold after a $100-million Series B in May 2026, bringing reported private capital to $120 million. |
| Xcimer Energy | $101 million | Laser inertial confinement | Developing a 10-megajoule laser and reported turning on its Phoenix prototype; it is a threshold case. |
Why the totals conflict
Private-company funding is not reported on one standardized ledger. Cutoff dates, paid-in versus committed money, strategic investments, SAFE notes, currency conversion, milestone tranches and treatment of subsidiaries can all change a total.
- Helion: FusionX reports $3.2 billion committed, while Helion’s June 4 announcement says $1.5 billion invested and gives a $15.5-billion post-money valuation.
- Commonwealth Fusion Systems: The Fusion Report listed $2.923 billion on June 30, before a later $1-billion round brought the TechCrunch figure to $3.94 billion.
- Proxima: TechCrunch/FusionX reports more than $682.9 million; another July account reports approximately $668 million after a €411-million raise.
- Focused Energy: The TechCrunch/FusionX figure is $277 million, versus $415 million in another industry account. Its reported $200 million of grants are not private capital.
- Kyoto Fusioneering: Reported totals are $121 million and $191 million under different tallies.
- General Fusion: FusionX reports more than $442 million, while another contemporary account cites $612 million. Its reported $127-million Nasdaq transaction on July 13, 2026 is a separate public-market event.
For diligence, treat each number as a dated reported total and ask what was actually paid in.
How the technologies differ
Magnetic confinement
- Tokamaks: Commonwealth Fusion Systems and Tokamak Energy use magnetic fields in a doughnut-shaped chamber.
- Stellarators: Proxima Fusion, Type One Energy and Thea Energy use twisted magnetic geometry designed for steady operation without relying on a large plasma current.
- Field-reversed configurations: Helion and TAE pursue compact, self-contained plasma configurations.
- Z-pinch: Zap Energy drives plasma current and uses sheared flow to control instabilities.
- Magnetized target fusion: General Fusion compresses magnetized plasma with liquid metal and pistons.
Inertial and pulsed systems
- Laser-driven: Inertia, Focused Energy, Marvel Fusion and Xcimer compress tiny fuel targets with laser energy.
- Electromagnetic pulses: Pacific Fusion uses coordinated electrical pulses rather than conventional laser compression.
- Projectile and pulsed-power lineage: First Light combines projectile compression concepts with pulsed-power capabilities.
Infrastructure and adjacent applications
Kyoto Fusioneering supplies balance-of-plant equipment. SHINE’s neutron testing, medical-isotope and radioactive-waste businesses are fusion-enabled but do not yet amount to a selected electricity-producing reactor. The Fusion Industry Association’s 2026 survey found 48% magnetic confinement, 21% inertial confinement and 14% magneto-inertial among the broader surveyed sector; those percentages do not describe only these 17 companies. See the Nuclear Industry Association summary.
What the funding does—and does not—prove
Scientific breakeven is not commercial power
The National Ignition Facility’s breakeven result compares fusion energy released with laser energy delivered to the target. It does not mean the complete facility produced more energy than it consumed. Commercial breakeven additionally requires an efficient driver, repeatable fuel shots or plasma pulses, heat removal, durable materials, maintenance, licensing and electricity sold at a competitive price. A useful explanation is provided by The Next Web.
The hard engineering questions
- Neutron damage and component replacement in a high-radiation environment.
- Tritium production, recovery and accounting for deuterium-tritium systems.
- High repetition rates for pulsed laser, electromagnetic and projectile concepts.
- Heat extraction and the rest of the plant beyond the plasma chamber.
- Manufacturing fuel targets, superconducting magnets and precision components at scale.
- Site licensing, grid interconnection, construction cost and delivered electricity price.
Company dates remain targets: Helion’s 2028 electricity goal, CFS’s SPARC milestones, Marvel’s 2027 demonstration expectation and planned utility projects from other companies should not be presented as operating results.
Rank #4
- Author: Guillebeau, Chris.
- Publisher: Currency
- Pages: 304
- Publication Date: 2012-05-08
- Edition: NO-VALUE
Important edge cases
- Exactly $100 million: excluded under a strict “over” test.
- Unclosed rounds: Type One’s $250-million Series B is not included until closed.
- Milestone financing: Pacific Fusion’s more-than-$1-billion commitment may arrive in tranches.
- Grants: Focused Energy’s government support is not added to its private total.
- Public transitions: TAE’s proposed merger and General Fusion’s listing change corporate status but do not rewrite historical private fundraising.
- Broader scope: A reactor-only list would remove SHINE and Kyoto Fusioneering; this list includes them because fusion commercialization also requires applications, equipment and plant integration.
Bottom line for readers tracking the market
Private capital has produced a diverse commercial-fusion sector, not a proven power technology. Funding totals are best read as evidence of investor commitment to different technical and business pathways—not as a ranking of which company will reach affordable electricity first. The decisive milestone remains a repeatable, maintainable and financeable plant that delivers power to a customer.
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