Radiant

Alternative Energy Equipment · El Segundo, CA · Founded 2019 · Privately Held (backing)

Manufacturer of portable nuclear microreactor technology designed to offer a climate-friendly alternative to diesel generators. Radiant is based in El Segundo, CA and was founded in 2019. It was valued at $1.9 billion at its Series D in Dec 2025, the last priced event on record. It has raised $570 million across 11 recorded rounds; the latest was a growth round in Jun 2026.

PMV mark · valuation
$1.9B
Oct 2026
Priced at
its Series D
Dec 2025
Total raised
$570.0M
Last round
PE Growth/Expansion
Jun 2026
How much has Radiant raised?
$570.0Macross 11 recorded rounds · Apr 2023 – Jun 2026

Most recently, Radiant raised an undisclosed amount in its PE Growth/Expansion (Jun 2026).

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Radiant round by round

11 rounds
Jun 2026PE Growth/Expansionundisclosed▮
+ 2 more investors · free account
Dec 2025Series D$350.0M▮
Boost VCleadDraper Associateslead+ 9 more investors · free account
May 2025Series C$166.0M▮
DCVClead+ 9 more investors · free account
Dec 2023Grant$3.8M▮
+ 1 more investors · free account
Aug 2023Grant$1.1M▮
+ 1 more investors · free account
Apr 2023Series B$40.7M▮
Andreessen Horowitzlead+ 8 more investors · free account
+ 5 earlier rounds · a free account shows the full history

How much has Radiant raised?

Radiant has raised $570 million across 11 recorded rounds since 2019. The largest was a $650,000 equity-based accelerator round in Jan 2019; the most recent was a growth round in Jun 2026. 5 of the rounds disclosed a post-money valuation.

Radiant has filed 2 Form Ds with the SEC since 2022, most recently in Apr 2023 ($40.7 million sold to 12 investors).

Radiant investors

57 investors are on record for Radiant, including Alumni Ventures, Andreessen Horowitz, U.S. Department of Energy and Founders Fund. By type, the record holds 27 venture capital firms and 2 family offices. The growth round in Jun 2026 drew 2 investors.

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Frequently asked about Radiant

How much has Radiant raised?
Radiant has raised $570.0M in total across 11 recorded funding rounds.
Who are Radiant's lead investors?
Lead investors in Radiant's recorded rounds include Andreessen Horowitz, Boost VC, Draper Associates, DCVC.
When was Radiant's last funding round?
Radiant's most recent recorded round was PE Growth/Expansion in Jun 2026.