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X-energy

EnergySeries B

Advanced nuclear reactor technology for reliable, clean energy

🌐 www.x-energy.comLinkedInX / Twitter📍 MDEst. 2018👥 51-200 employees
2Rounds
5Articles
General InformationX-energy is a Maryland-based nuclear technology company founded in 2018 that develops modular high-temperature gas-cooled reactors, with approximately 51-200 employees.
Funding & FinancialsX-energy has raised over $120 million across multiple funding rounds including Series B capital, backed by investors such as Breakthrough Energy Ventures and Lowercarbon Capital.
Leadership & TeamX-energy is led by CEO Clay Siegall, a veteran in nuclear and advanced energy technology development, with a team of nuclear engineers and energy professionals.
Recent ActivityX-energy has been advancing its Xe-100 modular reactor design and securing partnerships for demonstration projects, with recent focus on commercialization pathways for industrial heat applications.

Highlights

Total Raised
2 rounds
Latest Round
$1.02
May 27, 2026
Stage
Series B
energy
Employees
51-200
Founded 2018
Headquarters
MD
News Coverage
5 articles
Last: 16d ago
Talent Signals
SEC Filings

Backers

Amazon Climate Pledge Fund

Funding History

$500
2026
Series C-1
$1.02
2026
IPO
SEC Form D   Editorial
May 27, 2026
$1.02 billionIPO · Editorial

X-Energy, developer of high-temperature gas-cooled reactors (Xe-100), completed its Nasdaq IPO on April 24, 2026.

Apr 16, 2026
$500 millionSeries C-1 · Editorial

Investors: Amazon Climate Pledge Fund

Small modular reactor developer X-energy closed $500M Series C-1 led by Amazon to advance nuclear reactor technology for clean energy generation.

News Coverage 5

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