When was X Energy founded?

X Energy was founded in 2010 and raised its 1st funding round 6 years after it was founded.

Where is X Energy located?

X Energy is headquartered in Greenbelt, United States. It is registered at Rockville, Maryland.

How many employees does X Energy have?

As of Aug 31, 2026, the latest employee count at X Energy is 1691.

Is X Energy a funded company?

X Energy is a funded company, having raised a total of $1.53B across 14 funding rounds to date. The company's 1st funding round was a $6M Grant (prize money) round, raised on Jan 15, 2016.

When was the latest funding round of X Energy?

X Energy's latest funding was a $700M Series D round on Nov 24, 2025, with participation from 12 investors.

Is X Energy a Nuclear Energy company?

The primary sector of X Energy is Nuclear Energy.

Where does X Energy rank among its competitors?

X Energy ranks 1st amongst 5 active competitors, only 1 of which is funded. X Energy, which secured $700M in Nov, 2025.

Who are the top competitors of X Energy?

X Energy's top competitors include Jimmy, Stratek Global and Aquariusenergy. Among them, X Energy secured the most recent funding round in November, 2025.

X Energy - 2026 Company Profile, Team, Funding, Competitors & Financials

Sectors and market segments that X Energy operate in

X Energy serves in the Energy, Environment market segments.The primary business model of X Energy are:

Company Details

Developer of small modular & high temperature gas cooled nuclear reactor. It operates through tri-structural isotropic particle fuel. And also offers pebble bed nuclear reactor, zero emission energy, neutronics, and nuclear engineering services.

Website: x-energy.com
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Registered Address: Rockville, Maryland

Key Metrics

Founded Year

2010

Location

Greenbelt, United States

Stage

Public

Total Funding

$1.53B in 14 rounds

Latest Funding Round

Series D, Nov 24, 2025, $700M

Investors

Ares Management & 26 more

Ranked

1^st among 5 active competitors

Employee Count

1,691 as on Aug 31, 2026

Similar Companies

Jimmy & 3 more

Exit Details

Public

View X Energy's full profile

X Energy is associated with 2 legal entities given below:

Legal Entity Name	Date of Incorporation	Revenue	Latest Employee Count	Documents
X-ENERGY UK HOLDINGS, LTD CIN: 14273226 , United Kingdom, Active	Aug 02, 2022	-	4 (As on Dec 31, 2024)
X Energy, Llc CIN: 274661265 , United States, Active	Dec 26, 999	-	430 (As on Dec 31, 2024)	-

X Energy got listed on Apr 24, 2026.

Click here to take a look at X Energy's IPO in detail

X Energy has raised a total funding of $1.53B over 14 rounds. Its first funding round was on Jan 15, 2016. Its latest funding round was a Series D round on Nov 24, 2025 for $700M. 12 investors participated in its latest round. X Energy has 26 institutional investors and 1 angel investor.

Here is the list of recent funding rounds of X Energy:

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Date of Funding	Funding Amount	Round Name	Post-Money Valuation	Revenue Multiple	Lead Investors	Other Investors
Nov 24, 2025	$700M	Series D	-	-	Jane Street	ARK Investment Management, Galvanize, Hood River Capital, Point72, Reaves Asset Management, XTX Markets, Ares Management, Corner Capital Partn, Emerson Collective, NGP, Segra Capital
Jun 16, 2025	$22.8M	Series C	-	-	-	-
Jun 04, 2025	$1.86M	Grant (prize money)	-	-	-	OSTI

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View details of X Energy's funding rounds and investors

The founders of X Energy are Peng Han Lee and Kam Ghaffarian. J. Clay Sell is the CEO of X Energy.

Here are the details of X Energy's key team members:

Peng Han Lee: Founder and Director of X Energy.
Kam Ghaffarian: Founder of X Energy.
J. Clay Sell: CEO of X Energy.
Contact Info: 1 email address

View details of X Energy's Founder profiles and Board Members

X Energy's employee count trend

X Energy has 1,691 employees as of Aug 26. Here is X Energy's employee count trend over the years:

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Top competitors of X Energy include Jimmy, Stratek Global and Aquariusenergy. Here is the list of Top 10 competitors of X Energy, ranked by Tracxn score:

Rank	Company Details	Short Description	Total Funding	Investors	Tracxn Score
1st	X Energy 2010, Greenbelt (United States), Public	Developer of small modular & high temperature gas cooled nuclear reactor	$1.53B	Point72, Pittco & 25 others	63/100
2nd	Jimmy 2021, Levallois Perret (France), Series A	Operator of thermal generators providing decarbonized heat to industrial clients	$17.3M	Eren Groupe, Otium Capital & 4 others	54/100
3rd	Stratek Global 2022, Centurion (South Africa), Unfunded	Developer of high temperature modular reactor	-	-	16/100
4th	Aquariusenergy Menlo Park (United States), Unfunded	Developer of technology for nuclear energy generation using heavy water	-	-	16/100
5th	HolosGen 2017, Manassas (United States), Funding Raised	Developer of mobile scalable integral nuclear generators for distributable and safe electricity	-	Plug and Play Tech Center	15/100