Company lists · Data refreshed September 2026
Top 25 Nuclear energy companies based in the United States
This directory lists 64 nuclear energy companies based in the United States, with contact coverage including 33,376 contacts and 4,885 email addresses. As of September 2026, Houston is the single most-represented city among the companies on the list.
Nuclear energy companies develop, own, operate, manufacture, supply, or service systems and facilities that generate electricity or heat using nuclear reactions. This list covers companies involved in nuclear power generation, reactor development, fuel services, nuclear engineering, equipment supply, plant operations, maintenance, safety, waste management, or related services. Ranked by team size, largest first. Data current as of September 6, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest nuclear energy companies based in the United States
Ranked by team size| # | Company | RevenueBase Smart Search | Contacts | ||
|---|---|---|---|---|---|
| 1 | Partial evidence | 10,898 contacts → | |||
“Westinghouse Electric Company is the world's leading supplier of safe and innovative nuclear technology.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | Partial evidence | 9,458 contacts → | |||
“Constellation Energy Corporation (Nasdaq: CEG), a Fortune 200 company headquartered in Baltimore, is the nation’s largest producer of reliable, emissions-free energy and a leading…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | Indirect evidence | 3,832 contacts → | |||
“At BWX Technologies, Inc.(NYSE: BWXT), we are People Strong, Innovation Driven.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | Strong evidence | 1,254 contacts → | |||
“EnergySolutions is an international nuclear services company headquartered in Salt Lake City, Utah, and Charlotte, North Carolina, with operations across the United States and…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | Strong evidence | 1,055 contacts → | |||
“X-energy is delivering the next generation of carbon-free energy by reinventing nuclear power.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | Strong evidence | 684 contacts → | |||
“Centrus Energy is a trusted American supplier of nuclear fuel and services for the nuclear power industry, helping meet the growing need for clean, affordable, carbon-free energy.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | Partial evidence | 380 contacts → | |||
“Energy Harbor is a premier carbon free power producer and fully integrated retail energy provider.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | Strong evidence | 226 contacts → | |||
“Oklo's mission is to provide clean, reliable, affordable energy through the deployment of next-generation fast fission technology and recycling nuclear waste.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | Partial evidence | 129 contacts → | |||
“Hi Tech Solutions provides services to the nuclear power generation industry in four main areas: outage services (plant outages and reactor maintenance), nuclear fuel cycle…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | Partial evidence | 119 contacts → | |||
“Aalo Atomics designs and builds factory-manufactured nuclear power plants for data centers, industry, and cities.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | Strong evidence | 65 contacts → | |||
“DuBose National Energy Services, INC.(DNES) is a major, strategic supplier of metal and metal products to the international nuclear industry; including utilities, component…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | Strong evidence | 50 contacts → | |||
“NANO Nuclear Energy Inc.(NASDAQ: NNE) NANO Nuclear Energy Inc.(NASDAQ: NNE) is a North American advanced technology-driven nuclear energy company seeking to become a commercially…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | Partial evidence | 45 contacts → | |||
“Our mission is to develop and deploy nuclear-based power generating equipment that is safe, commercially competitive, and simple to use.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | Partial evidence | 33 contacts → | |||
“Founded in 1979 and now an EnergySolutions company, WMG, Inc.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 15 | Strong evidence | 28 contacts → | |||
“Pelican Energy Partners specializes in strategic investments in small to mid-sized, high-growth energy equipment and service companies within the oil & gas and nuclear sectors.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 16 | Partial evidence | 25 contacts → | |||
“Lightbridge is developing and commercializing next generation nuclear fuel technology that will significantly improve the economics and safety of existing and new reactors, with a…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 17 | Strong evidence | 22 contacts → | |||
“is meeting America’s long-term energy demands by developing safe, affordable, next-generation nuclear plants at utility scale.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 18 | Partial evidence | 19 contacts → | |||
“ARC is a leading clean energy technology company developing the ARC-100, an advanced, sodium-cooled, small modular reactor (aSMR).” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 19 | Strong evidence | 16 contacts → | |||
“Flibe Energy is working to design and develop lithium-fluoride nuclear reactors, which will provide clean energy and valuable materials for the world.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 20 | Indirect evidence | 10 contacts → | |||
“Aecon is a North American construction and infrastructure development company with global experience – transforming vision into reality.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 21 | Indirect evidence | 10 contacts → | |||
“Our Company TriVis Inc.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 22 | Strong evidence | 9 contacts → | |||
“At Nuclearis, we are pioneering the future of sustainable energy with our innovative nuclear solutions.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 23 | Indirect evidence | 6 contacts → | |||
Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 24 | Partial evidence | 5 contacts → | |||
“Joule is the value of energy.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 25 | Partial evidence | 5 contacts → | |||
“Gen4 Capital is the leading investment advisory and project development firm in the nuclear industry.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: nuclear energy companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names nuclear energy companies.
- Partial evidence
- Its own public description names part of nuclear energy companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name nuclear energy companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 64 nuclear energy companies based in the United States
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Nuclear energy companies based in the United States at a glance
As of Sep 6, 2026Companies by employee count
Freshness & accuracy
How recently the business emails on this list were verified
Email last verified
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among nuclear energy companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “nuclear energy companies”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names nuclear energy companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among nuclear energy companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 4,885 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 6, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
How many nuclear energy companies are in the directory?
The directory contains 64 nuclear energy companies based in the United States.
Where are nuclear energy companies located?
The companies are listed based in the United States, with Houston as the single most-represented city among the companies on the list.
How can I find contacts at nuclear energy companies?
The directory includes 33,376 contacts and 4,885 email addresses for nuclear energy companies.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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