Radiant: Funding, Investors & Team (Oct 2026)
Radiant is a clean energy startup building a nuclear microreactor. A climate-friendly alternative to diesel generators, Radiant's Kaleidos 1MW microreactor will be the world's first portable, zero-emissions power source that works anywhere. We plan to test our development reactor by 2026 and if successful, it will be the first new commercial reactor design to achieve a fueled test in over 50 years. Our microreactor can bring power to remote parts of the world and provide backup power for life-saving applications in hospitals or disaster-relief scenarios.
Radiant has raised $414M across 5 funding rounds on record, the most recent an undisclosed round announced in Feb 2026.
Radiant Company Profile and Key Stats
Latest funding round on record: Feb 2026.
Radiant Funding Rounds
1 of 5 rounds was announced without a disclosed amount and is excluded from the total.
Radiant raised $1.2M in an undisclosed round announced in Sep 2020.
1.5 years later, an undisclosed round of $12.6M was announced in Mar 2022.
2.7 years later, a Series C of $100M was announced in Nov 2024.
1.1 years later, a Series D of $300M was announced in Dec 2025.
2 months later, an undisclosed round was announced in Feb 2026 with no disclosed amount.
Radiant Founders and Leadership Team
Contact details for the Radiant team: 1 of 2 have an email address on file.
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Radiant Funding FAQs
What does Radiant do?
Radiant is a clean energy startup building a nuclear microreactor. A climate-friendly alternative to diesel generators, Radiant's Kaleidos 1MW microreactor will be the world's first portable, zero-emissions power source that works anywhere. We plan to test our development reactor by 2026 and if successful, it will be the first new commercial reactor design to achieve a fueled test in over 50 years. Our microreactor can bring power to remote parts of the world and provide backup power for life-saving applications in hospitals or disaster-relief scenarios.
How much funding has Radiant raised?
Radiant has raised $414M across 5 rounds on record.
When did Radiant last raise funding?
Radiant's most recent funding round on record was announced in Feb 2026. The amount was not disclosed.
Who founded Radiant?
FundedIQ lists Bob Urberger (Founder) at Radiant.
Who is the CEO of Radiant?
Doug Bernauer is listed as CEO at Radiant.
Where is Radiant headquartered?
Radiant is based in El Segundo, California, United States.
How many employees does Radiant have?
Radiant is in the 11-50 employee band.
About FundedIQ's Radiant Funding Data
FundedIQ tracks announced funding rounds and refreshes this profile every week. Round dates, stages and amounts are normalised to a single format, converted to US dollars, and de-duplicated: two records of the same round announced days apart are merged, and two genuinely different rounds are kept apart on the amounts they disclose. Amounts shown are the disclosed figures only — a round announced without a number is listed and excluded from the total rather than estimated.
Employee counts are reported bands, not exact headcounts. Founder and executive names carry the job title on record. Anything we do not hold for Radiant is left off this page rather than filled in.
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