Company lists · Data refreshed September 2026
Top 25 Nuclear engineering consulting firms based in the United States
RevenueBase identified 724 nuclear engineering consulting firms headquartered in the United States as of September 2026 and tracks 54,152 professional contacts across them, including 13,716 with verified work emails and 18,795 with mobile numbers. Houston is the largest hub.
This list covers nuclear engineering consulting firms headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 engineering consulting firms based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 25,068 | ||||
“Bechtel is a trusted engineering, construction and project management partner to industry and government.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 4,156 | ||||
“Sargent & Lundy is one of the world’s longest-standing full-service architect engineering firms.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | NAESIndirect evidence | 1,956 | |||
“NAES is the power generation industry’s largest independent services provider, with more than 40 years of experience managing risk and turning it into profits.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 1,865 | ||||
“ENERCON is a multi-discipline engineering and environmental engineering support services firm focused on delivering safe and efficient solutions for the power, data center and…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | 1,560 | ||||
“In an era of accelerating change, Exponent is the only premium engineering and scientific consulting firm with the depth and breadth of expertise to solve our clients’ most…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 1,254 | ||||
“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 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | 526 | ||||
“Dedicated to “Excellence in Engineering,” E2 Consulting Engineers, Inc.(E2) is a professional services firm established in 1988 specializing in a full spectrum of engineering…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | Recon Management Services, INCStrong evidence | 420 | |||
“ReCon was established in 1995 and has matured as a high quality and competitive engineering consulting firm providing engineering design and project management services to the…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | 404 | ||||
“GSE Solutions supports nuclear power and clean-energy fleets worldwide through integrated engineering services and software that strengthen operational performance.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | MPR Associates, INCPartial evidence | 353 | |||
“In 1964, a trio of visionary engineers, from Admiral Rickover's Naval nuclear propulsion program, set out to form a company built around technical excellence.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 313 | ||||
“Chemical & Industrial Engineering, Inc.(C&I) is a full-service Engineering, Design & Procurement firm, providing hands-on design expertise for increasing capacity, improving…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 310 | ||||
“We are A-Team of engineers specializing in the energy industry.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 279 | ||||
“Founded in 2003, Edgewater Technical Associates, LLC (Edgewater) is a New Mexico-based small business headquartered in Los Alamos, NM, with a national footprint supporting complex…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | Sonic SystemsStrong evidence | 245 | |||
“Founded in 1977 Sonic Systems International (SSI) is a full-service quality-consulting firm serving the nuclear power generation utility industry.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | Paragon Energy SolutionsPartial evidence | 234 | |||
“Paragon tackles the most difficult challenges of the nuclear industry-those faced by the current operating fleet as well as the next generation of advanced reactors.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 224 | ||||
“Boston Government Services, LLC (BGS) is an engineering, technology, and security firm providing mission-focused solutions for the clean energy, nuclear, and federal programs…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 190 | ||||
“Boswell is a leading, fully integrated, multi-disciplinary firm providing a comprehensive range of engineering and power & energy services to federal, state, county, and local…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | Strategic Management Solutions, LLC SmsiPartial evidence | 188 | |||
“SMSI is a small business providing management and technical/engineering services to the DOE/NNSA, national laboratories, and industrial clients.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | United Engineers & Constructors An Aecon CompanyStrong evidence | 187 | |||
“United Engineers & Constructors is an industry-leading infrastructure engineering, procurement, construction, and consulting company dedicated to improving lives by delivering the…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | Thielsch EngineeringIndirect evidence | 175 | |||
“Thielsch, Inc.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | Spectra Tech, INCStrong evidence | 162 | |||
“Spectra Tech is an engineering, environmental, and nuclear services company that focuses on providing high quality and cost-effective technical solutions for our Federal…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | PSE Engineers & ConsultantsStrong evidence | 157 | |||
“PSE is an electrical energy expert that provides relationship-driven engineering and consulting services for forward-thinking partners who pursue long-term energy solutions.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | 153 | ||||
“Grumman|Butkus Associates (GBA) is a nationally recognized consulting engineering firm that specializes in mechanical, electrical and plumbing design services and energy and…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | 149 | ||||
“Dunham is a full service mechanical and electrical consulting firm.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | Premier Technology INCIndirect evidence | 138 | |||
“Premier Technology, Inc.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 724 nuclear engineering consulting firms based in the United States
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Nuclear engineering consulting firms based in the United States at a glance
As of Sep 5, 2026Companies by employee count
Verified emails by last verification
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 engineering consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 engineering consulting firms”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among nuclear engineering consulting firms, 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 an evidence 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, 13,716 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 5, 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 engineering consulting firms are there based in the United States?
RevenueBase identified 724 nuclear engineering consulting firms headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Bechtel Corporation, headquartered in Reston, tops this list with the largest team on record.
Which city has the most nuclear engineering consulting firms?
Houston leads with 23 headquartered companies, followed by Austin (9) and Charlotte (9).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 13,716 verified decision-maker contacts tracked across these 724 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 5, 2026.
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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 SmartSearch, 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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