All Industries

Top Nuclear Energy Companies

16 Nuclear Energy companies, sorted by total funding raised.

Commonwealth Fusion

MIT spinout developing compact tokamak fusion power plants using high-temperature superconducting...

Cambridge, United States501–1000Energy, Nuclear Energy
Series B·$2.0B·Nov 2021
OkloIPO

Emission free, always on power from advanced fission power plants.

Santa Clara, United States11–50Climate Tech, Industrials
Growth Equity·$2.0B·Oct 2025
X-EnergyIPO

Advanced nuclear reactor company developing small modular reactors and TRISO fuel for clean power

Rockville, United States501–1000Clean Energy, Nuclear Energy
Series D·$1.9B·Nov 2025
Radiant

Clean energy startup developing portable nuclear microreactors as zero-emission alternatives to d...

El Segundo, United States51–200Nuclear Energy, Clean Energy
Series D·$465.0M·Dec 2025
Standard Nuclear

Manufacturer of TRISO nuclear fuel for advanced reactors, supplying utilities and reactor develop...

Oak Ridge, United States11–50Clean Energy, Nuclear Energy
Series A·$182.0M·Jan 2026
Antares Industries

Making energy abundant from Earth to the asteroid belt

Los Angeles, United States51–200Defense Tech, Energy
Series B·$109.0M·Dec 2025
Maritime Fusion

Fusion reactors for ships

1–10Industrials, Nuclear Energy
Seed·$4.5M·Nov 2025
K
Kurion

Nuclear waste treatment company using vitrification to convert radioactive waste into stable glas...

United StatesEnvironmental Services, Nuclear Energy
Funding undisclosed
Atomic Canyon

Atomic Canyon builds AI-powered search and data management platforms for the nuclear energy secto...

San Luis Obispo, United States1–10Nuclear Energy, Artificial Intelligence
Seed·May 2025
Natura Resources

Advanced nuclear development company designing and deploying liquid-fueled molten salt reactors f...

United StatesEnergy, Nuclear Energy
Funding undisclosed
Astral Systems

Deep tech startup pioneering multistate fusion (MSF) technology with compact fusion reactors targ...

Bristol, United KingdomDeep Tech, Nuclear Energy
Funding undisclosed
Seaborg

Seaborg Technologies (now Saltfoss Energy) develops compact molten salt reactors for safe, mass-p...

DenmarkEnergy, Nuclear Energy
Funding undisclosed
Helion Energy

Building the world's first fusion power plant

Everett, United States51–200Climate Tech, Deep Tech
Series F·Jan 2025
Elementl Power

Advanced nuclear project developer and independent power producer building scalable pathways for ...

Washington, United States1–10Nuclear Energy, Clean Energy
Funding undisclosed
Renaissance Fusion

Builds stellarators — the most efficient, steady, and stable fusion reactors on earth — to delive...

Clean Tech, Energy
Funding undisclosed
Atomic AlchemyAcquired

We produce cancer-curing materials used in nuclear medicine.

Idaho Falls, United States1–10Deep Tech, Industrials
Seed·Jan 2019