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Radiant funding, valuation and investors
Portable micro-nuclear reactors for remote power and defense applications.
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Funding, valuation & investors
Answer-first snapshotLatest funding
Series D
$300M · December 2025
Latest known valuation
$1.8B
Series D · December 2025
Total disclosed equity funding
$440M
Excludes debt, grants, acquisitions, secondaries, and IPO proceeds.
Current status
private
growth · El Segundo, California
Overview
Radiant Nuclear designs factory-built, transportable microreactors using liquid-metal-cooled technology intended to replace diesel generators at remote industrial and defense sites. Founded by SpaceX engineers Doug Bernauer and Paul Lichtman, the company raised a $40M Series B in April 2023 led by a16z American Dynamism, a $100M Series C in October 2024, and a $300M Series D in December 2025 at a $1.8B valuation led by Draper Associates.
Why Radiant is interesting
Radiant targets factory-built transportable microreactors to replace diesel generators — a16z American Dynamism led Series B before a $300M Series D at $1.8B in December 2025.
Product & use cases
Radiant's Kaleidos microreactor is factory-built, transportable by truck, and designed for megawatt-scale power at remote sites — data centers, mining, defense outposts, and disaster relief.
- Remote industrial site power replacing diesel generators
- Defense and military forward operating base energy
- Data center backup and primary power
- Disaster relief and emergency power deployment
Key facts
- Series D (Dec 2025): $300M at $1.8B — Radiant press
- Series C (Oct 2024): $100M led by DCVC
- Series B (Apr 2023): $40M led by a16z American Dynamism
- Founded by SpaceX engineers
Funding history (newest first)
Series D
2025-12 $300M Valuation: $1.8B- Draper Associates (lead)
- Founders Fund (participant)
Source: Read source · radiantnuclear.com
Series C
2024-10 $100M- DCVC (lead)
- Andreessen Horowitz (participant)
- Union Square Ventures (participant)
- Founders Fund (participant)
Source: Read source · radiantnuclear.com
Series B
2023-04 $40MSource: Read source · radiantnuclear.com
Investors in our directory
Funds linked from Radiant's profile — open a fund page for stage focus and related deal articles.
Competitive landscape
Edge: SpaceX engineering pedigree and factory-built transportable design — targets faster deployment than conventional nuclear plants.
Nuclear startup landscape is capital-intensive with long regulatory timelines. Radiant's $300M Series D at $1.8B reflects AI/data-center power demand tailwinds. Must navigate NRC licensing — years from commercial deployment.
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Oklo direct
Public microreactor company (NYSE: OKLO) with Aurora design.
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NuScale direct
Small modular reactor developer.
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Diesel generators incumbent
Default remote power source Radiant aims to replace.
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Last Energy / other microreactor startups adjacent
Competing SMR/microreactor designs.
Notable stories
- Radiant's founders Doug Bernauer and Paul Lichtman are SpaceX alumni — applying aerospace manufacturing discipline to nuclear reactor production.
- The December 2025 $300M Series D at $1.8B came as data-center power demand made micro-nuclear a hot investor thesis.
Industries
Market / IPO context
Editorial / static context — not a live quote.
Related funding articles
Venture Capital Tracker pieces that cover Radiant's financing or category context.
FAQs about Radiant
Practical answers founders, operators, and investors typically search for.
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Editorial note: AI tools assisted with research, structure, or drafting. Venture Capital Tracker retains human editorial responsibility for factual accuracy, relevance, and source quality before publication.