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
Investors13
- FundAndreessen Horowitz (a16z) - American DynamismPractice within a16z investing in defense, aerospace, and national interest companies.
- FundDCVCDeep tech VC firm investing in AI-enabled solutions for defense, climate, and industry.
- FundStepStone GroupPrivate markets investment firm; participated in Overland AI's $100M Series B (Feb 2026).
- FundUnion Square VenturesNew York City-based generalist venture capital firm founded in 2003; led Isembard's $50M Series A (March 2026).
- FundFelicisMulti-stage VC investing in mission-driven companies including defense technology.
- FundWashington Harbour PartnersArlington, VA growth-equity fund focused on cybersecurity, government technology, and national-security-relevant enterprise technology.
- FundFounders FundMulti-stage VC known for early bets on SpaceX, Palantir, and Anduril.
- FundDecisive PointUS venture capital and strategic advisory firm investing in critical technologies for defense, energy and infrastructure; participated in Orqa's €5.8M Seed round (Dec 2024) and in Scout AI's seed and $100M Series A.
- FundBoost VCVenture capital firm/accelerator; participated in Solideon's oversubscribed $5M+ pre-seed round (July 2024).
- FundHanwha Asset ManagementAsset management arm of the Hanwha Group; new investor in Forterra's $238M Series C (Nov 2025). Distinct from fund:hanwha-aerospace / company:hanwha-aerospace (the Korean defense manufacturer, a separate Hanwha Group entity).
- FundAlign VenturesVenture firm; co-led both of Scout AI's rounds — the $15M seed (Jan 2025) and the $100M Series A (Apr 2026).
- FundDraper AssociatesDraper Associates is Tim Draper's early-stage venture capital firm, founded in 1985 and based in San Mateo, California.
- FundFriends & Family CapitalInvestment firm founded by Colin Anderson (ex-Palantir CFO) and John Fogelsong; led Valinor Enterprises' $54M Series A (January 2026).
Cap table0
Approximate ownership by holder. Indexed holders link to their records.
Raised per round
Valuation over time
Percentages marked ~ are not disclosed. Some are a generic VC-pattern model (founders/team weighted heaviest, option pool lightest, other holders evenly) sized to whatever's left undisclosed — a standard industry shape, not this company's actual cap table.
| Holder | Instrument | Ownership |
|---|---|---|
Washington Harbour PartnersReinvested | Series D Preferred | ~8.3% |
StepStone GroupReinvested | Series D Preferred | ~8.3% |
Giant VenturesReinvested | Series D Preferred | ~8.3% |
DCVCReinvested | Series D Preferred | ~8.3% |
a16z American DynamismReinvested | Series D Preferred | ~8.3% |
Align VenturesReinvested | Series D Preferred | ~8.3% |
Chevron Technology VenturesReinvested | Series D Preferred | ~8.3% |
ARK Venture FundReinvested | Series D Preferred | ~8.3% |
Founders FundReinvested | Series D Preferred | ~8.3% |
Boost VCReinvested | Series D Preferred (co-lead) | ~8.3% |
| Series D Preferred | ~8.3% | |
| Series D Preferred (co-lead) | ~8.3% |
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 & citations11
11 sources behind every claim
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