X-energy
About X-energy
X-energy is a Nuclear Power startup based in Rockville, Maryland, United States that has raised $2.7B in venture capital across 4 funding rounds since 2009. The company reached IPO stage in December 2023 with a $235M round led by Ares Management. X-energy's investor base includes 16 institutional funds, with Amazon leading the most recent equity round.
X-energy is an American nuclear reactor and fuel design engineering company developing Generation IV high-temperature gas-cooled pebble-bed small modular reactors (SMRs). Its flagship product, the Xe-100, is an 80 MWe SMR designed for modular deployment as a four-unit 320 MWe power plant. The company also operates TRISO-X, a TRISO nuclear fuel fabrication facility in Oak Ridge, Tennessee, which produces the specialized pebble fuel for its reactors. X-energy serves utilities, industrial energy users, and data center operators seeking reliable, carbon-free baseload power. Amazon has committed to purchase up to 5 gigawatts of power from X-energy's reactors by 2039, one of the largest corporate nuclear offtake agreements ever signed. The company listed on the Nasdaq Global Select Market under ticker XE in April 2026.
X-energy Funding Rounds Timeline
4 rounds · $2.7B raised · since 2009
| Round | Date | Amount | Valuation | Lead investor | Co-investors |
|---|---|---|---|---|---|
| Series C | December 2023 | $235M | — | Ares Management | Ontario Power Generation, Curtiss-Wright Corporation, DL E&C, Doosan Enerbility |
| Series C-1 | February 2025 | $700M | — | Amazon | Ares Management, Emerson Collective, Jane Street, Segra Capital Management |
| Series D | November 2025 | $700M | — | Jane Street | ARK Invest, Ares Management, Emerson Collective, Galvanize, Hood River Capital Management, Point72, Reaves Asset Management, Segra Capital Management, XTX Ventures, Corner Capital |
| IPO | April 2026 | $1.0B | — | — | — |
Investors in X-energy
16 institutional investors across 4 rounds
Lead investors
Co-investors
Recent news about X-energy
Questions about X-energy
How much has X-energy raised?
X-energy has raised $2.7B across 4 funding rounds since 2009.
Who are the investors of X-energy?
X-energy's investors include Amazon, Ares Management, Jane Street, Emerson Collective, ARK Invest, Ontario Power Generation, Curtiss-Wright Corporation, DL E&C, Doosan Enerbility, Segra Capital Management, Galvanize, Hood River Capital Management, Point72, Reaves Asset Management, XTX Ventures, Corner Capital.
When was X-energy's last funding round?
X-energy's most recent round was a $235M Series C in December 2023, led by Ares Management.
Where is X-energy headquartered?
X-energy is headquartered in Rockville, Maryland, United States, and was founded in 2009 by Kam Ghaffarian.