Radiant Industries
Portable microreactor (Kaleidos) developer for defense installations and data centers.
Radiant Industries (Radiant Nuclear) develops the Kaleidos portable microreactor, a zero-emissions power source. Founded by ex-SpaceX engineers Doug Bernauer (CEO) and Bob Urberger (CTO), Radiant was assigned Buckley Space Force Base under the U.S. Air Force's Advanced Nuclear Power for Installations program and is 1 of 11 companies selected for the DOE Nuclear Reactor Pilot Program.
Overview
- Headquarters
- El Segundo, CA
- Founded
- 2020
- Employees
- ~500
- Total funding
- ~$518.8M
- Valuation
- $1.8B (Series D, Dec 2025)
- Stage
- Series D
- Status
- active
- Domains
- Website
- www.radiantnuclear.com
Founders2
Investors0
No linked records yet.
Cap table0
Approximate ownership by holder. Indexed holders link to their records.
| Holder | Instrument | Ownership |
|---|
Frequently asked
- What does Radiant Industries do?
- Radiant Industries (Radiant Nuclear) develops the Kaleidos portable microreactor, a zero-emissions power source. Founded by ex-SpaceX engineers Doug Bernauer (CEO) and Bob Urberger (CTO), Radiant was assigned Buckley Space Force Base under the U.S. Air Force's Advanced Nuclear Power for Installations program and is 1 of 11 companies selected for the DOE Nuclear Reactor Pilot Program.
- Where is Radiant Industries headquartered?
- Radiant Industries is headquartered in El Segundo, CA and was founded in 2020.
- How much funding has Radiant Industries raised?
- Radiant Industries has raised ~$518.8M in disclosed funding, at a most recent valuation of $1.8B (Series D, Dec 2025).
- Does Radiant Industries hold government contracts?
- Defense Tech Atlas links Radiant Industries to 1 government contract and 1 program.
Sources & citations4
Each claim links to its underlying source. Confidence reflects how directly the source supports the claim.
- 1
Former SpaceX engineers raised $1.2M and launched Radiant, developing a portable zero-emissions power source
GlobeNewswire: Former SpaceX Engineers Raise $1.2M and Launch RadiantVerified2020-09-22 - 2
Radiant raised $300 million Series D for small reactors at a $1.8B valuation, December 2025
Bloomberg: Nuclear Startup Radiant Raises $300 Million for Small ReactorsVerified2025-12-17 - 3
Radiant's Series C reached a final close of $165 million by May 2025, bringing total venture funding to $225 million (initial $100M close Nov 2024 led by DCVC)
Bloomberg: US Nuclear Startup Radiant Raises $165 Million for Micro-Reactor DesignVerified2025-05-28 - 4
Radiant's Kaleidos microreactor was 1 of 11 selected for the DOE Nuclear Reactor Pilot Program
U.S. Department of Energy: Department of Energy Announces Initial Selections for New Reactor Pilot ProgramVerified2025-08-12