Verified Nov 2026
Thermal & Fluid Systems
·
El Segundo, California
·
Since 2020
Radiant is a United States company founded in 2020 and headquartered in El Segundo, California, with an employee band of 500 to 1,000. It develops portable nuclear microreactors, including its Kaleidos unit rated at 1 MW electric and 1.9 MW thermal, intended as a zero-emissions alternative to diesel generators. The company serves the military-defense, electric-vehicles, medical, renewable-energy, automotive, and industrial-equipment sectors. Ownership is private, and revenue is not disclosed.
Radiant at a glance
Employees
500-1,000
Founded
2020
Headquarters
El Segundo, California
Import activity
22053
Industries
Automotive
Electric Vehicles
Medical
Military & Defense
Renewable Energy
Industrial Equipment
Sourcing and import activity
From US customs bill-of-lading records
US sea imports
22053
Named foreign suppliers
50
Top origins
China · Singapore · South Korea · Taiwan
Shared foreign counterparties do not establish that these companies buy from Radiant.
What this tells a buyer
Radiant announced a $750 million contract from the US Army to supply energy to US military bases in August 2026, and the US Navy selected it in October 2026 to power critical infrastructure at Naval Weapons Station Crane.
Radiant's Kaleidos microreactor uses TRISO fuel and passive helium gas cooling, and the company has secured long-term supply arrangements for TRISO fuel and domestic HALEU.
Radiant is a privately held company that has raised over $518 million in venture capital, with investors including Andreessen Horowitz and Founders Fund.
Source: US customs bill-of-lading records and public filings · Last verified Nov 05, 2026
Overview
Radiant is a United States company founded in 2020 and headquartered in El Segundo, California, with an employee band of 500 to 1,000. It develops portable nuclear microreactors, including its Kaleidos unit rated at 1 MW electric and 1.9 MW thermal, intended as a zero-emissions alternative to diesel generators. The company serves the military-defense, electric-vehicles, medical, renewable-energy, automotive, and industrial-equipment sectors. Ownership is private, and revenue is not disclosed.
At a glance
Attribute | Detail |
|---|---|
Founded | 2020 |
Headquarters | El Segundo, California |
Employees | 500-1,000 |
Primary capability | Thermal & Fluid Systems |
What Radiant makes
Radiant's Kaleidos microreactor uses TRISO fuel and passive helium gas cooling, and the company has secured long-term supply arrangements for TRISO fuel and domestic HALEU.
Products and capabilities described on the company's own site include LED, Assembly (source: radiantnuclear.com).
Trade and customs footprint
Radiant announced a $750 million contract from the US Army to supply energy to US military bases in August 2026, and the US Navy selected it in October 2026 to power critical infrastructure at Naval Weapons Station Crane. US customs bill-of-lading records list 22053 inbound shipments across 50 foreign suppliers, with top origins including China · Singapore · South Korea · Taiwan.
Latest developments
2026-10-20 — US Navy Selects Radiant to Power Critical Infrastructure at Naval Weapons Station Crane | Radiant (radiantnuclear.com)
2026-09-09 — Centrus and Radiant Announce Long-Term Partnership for Domestic HALEU to Supply Kaleidos Microreactors | Radiant (radiantnuclear.com)
2026-08-26 — Radiant Wins $750M Contract from US Army to Deliver Energy Independence to US Military Bases | Radiant (radiantnuclear.com)
2026-08-20 — Radiant Locks TRISO Fuel Supply Through Early 2030s | Radiant (radiantnuclear.com)
2026-04-22 — Air Force Selects Radiant to Deliver Microreactors to Buckley Space Force Base | Radiant (radiantnuclear.com)
2026-02-17 — Radiant Adds Lockheed Martin as Strategic Investor to Oversubscribed Funding Round | Radiant (radiantnuclear.com)
Facilities
Radiant is headquartered in El Segundo, California. Public sources also reference these locations:
Oak Ridge, Tennessee — radiantnuclear.com
Company details
Radiant is a privately held company that has raised over $518 million in venture capital, with investors including Andreessen Horowitz and Founders Fund. Radiant was founded in 2020, has an estimated 500-1,000 employees, and is headquartered in El Segundo, California.
Frequently asked questions
What does Radiant make?
Radiant is a United States company founded in 2020 and headquartered in El Segundo, California, with an employee band of 500 to 1,000. It develops portable nuclear microreactors, including its Kaleidos unit rated at 1 MW electric and 1.9 MW thermal, intended as a zero-emissions alternative to diesel generators. The company serves the military-defense, electric-vehicles, medical, renewable-energy, automotive, and industrial-equipment sectors. Ownership is private, and revenue is not disclosed.
Where is Radiant headquartered?
Radiant is headquartered in El Segundo, California.
When was Radiant founded?
Radiant was founded in 2020.
How big is Radiant?
Radiant has an estimated 500-1,000 employees.
Does Radiant import from overseas suppliers?
US customs bill-of-lading records show 22053 inbound shipments for Radiant, with top origins including China · Singapore · South Korea · Taiwan.
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Last verified Nov 2026. Is this your company? Request a correction.
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