Funding round
Radiant Nuclear Series C
Radiant Nuclear, which works in nuclear microreactor development and manufacturing in El Segundo, raised $165M in a Series C round announced on 28 May 2025, led by DCVC. 25 firms took part. It is Radiant Nuclear's third venture round on record; the one before was a Series B in Apr 2023.
$165M
Amount raised
Not disclosed
Post-money valuation
25
Investors
1 lead
Valuation
What this round says about the price
Radiant Nuclear did not disclose a valuation in this round. It came 25 months after Radiant Nuclear's Series B. It is 32% of the $518M Radiant Nuclear has raised in the venture rounds on record. Radiant Nuclear raised again 7 months later: a Series D round of $300M in Dec 2025, at $1.80B post-money.
Radiant Nuclear's funding rounds
Radiant Nuclear has 4 venture rounds on record. This one is highlighted.
Investors
Who put money in
DCVC led the round with 24 other firms.
Lead investor
- DCVC backs 171 venture-backed companies new investor
Also in the round
- StepStone new investor
- backs 51 venture-backed companies new investor
- backs 13 venture-backed companies new investor
- SGA new investor
- Crossbeam Venture Partners new investor
- Align Ventures new investor
- backs 2 venture-backed companies new investor
- backs 16 venture-backed companies new investor
- HartBeat Ventures new investor
- Pax Ventures new investor
- Andreessen Horowitz backs 722 venture-backed companies new investor
- Union Square Ventures backs 171 venture-backed companies new investor
- Founders Fund backs 368 venture-backed companies new investor
- backs 105 venture-backed companies new investor
- Felicis backs 237 venture-backed companies new investor
- backs 30 venture-backed companies new investor
- Chevron Technology Ventures new investor
- backs 13 venture-backed companies new investor
- McKinley Alaska new investor
- backs 5 venture-backed companies new investor
- backs 77 venture-backed companies new investor
- backs 13 venture-backed companies new investor
- Giant Ventures Global
- Alumni Ventures new investor
Use of proceeds
What the money is for
According to the announcement, the money goes to product development, scaling operations and working capital.
- Product development
- Scaling operations
- Working capital
Comparable rounds
How it compares
The closest in time: 1 in Electric Supplies & Power Generation, then Series C rounds in any sector within 6 months:
| Company | Announced | Amount | Post-money | Led by |
|---|---|---|---|---|
| Electric Supplies & Power Generation | 2 Feb 2026 | $176M | not disclosed | not named |
| CHAOS Industries Aerospace and Defence | 2 May 2025 | $275M | $2.00B | New Enterprise Associates and Accel |
| Biotechnology | 19 May 2025 | $120M | not disclosed | RA Capital and Forbion |
| Owner Tech Companies | 13 May 2025 | $120M | $1.00B | Meritech Capital and Headline |
| Parloa Tech Companies | 6 May 2025 | $120M | $1.00B | Durable Capital Partners and Altimeter |
| Tech Companies | 12 May 2025 | $110M | $600M | Entrée Capital |
| Tech Companies | 7 May 2025 | $100M | $1.10B | ICONIQ Growth |
| Tech Companies | 14 May 2025 | $90M | not disclosed | Temasek |
Sources
Where this comes from
Reported by 6 sources.
Questions
Frequently asked
How much did Radiant Nuclear raise in its Series C round?
Radiant Nuclear raised $165M in its Series C round, announced in May 2025.
Who led Radiant Nuclear's Series C round?
DCVC led it, with StepStone, Giant Ventures, HAM Ventures USA, SGA and Crossbeam Venture Partners and 19 more.
What was Radiant Nuclear's valuation at the Series C round?
It was not disclosed.
Did Radiant Nuclear raise again after this round?
Yes: a Series D round in Dec 2025 of $300M at $1.80B post-money.