X-Energy
IPOAdvanced Nuclear Reactor & Fuel Design Engineering
Public · Rockville, United States · Founded 2009 · $2.1B raised
- Headquarters
- Rockville, Maryland
- Employees
- 501–1000
- Founded
- 2009
- Business Model
- B2B
- Website
- x-energy.com
- Total Funding
- $2.1B
- Last Round
- $700.0M Series DNov 2025
- Rounds
- 4
- Type
- Public
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
About
X-energy develops advanced nuclear energy technologies centred on high-temperature gas-cooled reactors and TRISO fuel. Its Xe-100 small modular reactor and TRISO-X fuel are designed to provide reliable, carbon-free heat and electricity for utilities and industrial customers. The company combines reactor and fuel development to support deployment of advanced nuclear power at commercial scale.
Summary
X-Energy is a Clean Energy company based in Rockville, United States, founded in 2009. It has raised $2.1B in total across 4 rounds, most recently a $700.0M Series D round in Nov 2025. Investors include Ares Management, Jane Street and Amazon.
Tech & App Stack
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Funding & Exit History
Apr 2026
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Funding: Series C through Series D. Amounts, valuations, and investors where available.
Investors
Ares Management
3 rounds
Jane Street
2 rounds
Amazon
1 round
Emerson Collective
2 rounds
ARK Invest
1 round
Galvanize
1 round
Hood River Capital Management
1 round
Point72 Ventures
1 round
Reaves Asset Management
1 round
XTX Ventures
1 round
Corner Capital
1 round
Segra Capital Management
1 round
Amazon Climate Pledge Fund
1 round
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