1,609 companies in our data use MCNP, and 465 of them name it in job posts they wrote. Its share of job posts is growing, and 607 job posts named it from October 2025 to August 2026. Nuclear Engineer roles mention it most.
The companies with the most job posts naming MCNP are Framatome (125), Orano (121) and Oak Ridge National Laboratory (110). Of the five companies in the table, Los Alamos National Laboratory has the most employees who list it on their profiles: 105.
CompanyPostsPeopleRecent job post
FramatomeUtilities · first seen Sep 202212560
"justifier la qualification d'un code de calcul dans un domaine d'utilisation choisi, notamment à l'aide un code de référence Monte Carlo que vous maîtrisez (MORET, MCNP ou TRIPOLI-4)"Experienced engineer in criticality – neutronics (m/f), Jul 2, 2026
OranoUtilities · first seen Sep 202212121
"…travailler en équipe vous avez des connaissances en codes de calculs de radioprotection (MCNP, TRIPOLI, etc.) et/ou de criticité (Formulaire CRISTAL, SCALE, TRIPOLI, etc.)."Experienced safety calculations engineer (m/f), Nov 4, 2026
Oak Ridge National LaboratoryPublic Administration · first seen Aug 202211041
"…reactor models using world-class modeling and simulation codes (SCALE, VERA, OpenMC, MCNP, Serpent, MOOSE) to support the design and development of next generation nuclear reactors."Advanced Nuclear Reactor and Fuel Cycle Engineer (Associate), Oct 27, 2026
Los Alamos National LaboratoryPublic Administration · first seen Jul 2022105105
"Perform criticality safety calculations using MCNP and other Monte Carlo transport codes"Criticality Safety Analyst 4/5, Oct 21, 2026
Westinghouse Electric CompanyUtilities · first seen Sep 20227535
"Relevant computer codes like MCNP, SCALE, or similar"Nuclear Engineer II (Hybrid), Aug 12, 2025
A larger share of job posts mentioned MCNP from June to August 2026 than from March to May: 0.35 in every 10,000 job posts, up from 0.29. August 2026 was its highest month since October 2025, at 0.42.
Show the data
Month
Job posts naming MCNP
All job posts
Per 10,000
Oct 2025
36
1,413,673
0.25
Nov 2025
63
1,822,119
0.35
Dec 2025
30
1,236,103
0.24
Jan 2026
59
1,828,002
0.32
Feb 2026
67
1,856,647
0.36
Mar 2026
64
1,850,711
0.35
Apr 2026
48
1,728,886
0.28
May 2026
46
1,821,509
0.25
Jun 2026
49
1,909,496
0.26
Jul 2026
67
1,815,180
0.37
Aug 2026
78
1,835,698
0.42
How many companies named MCNP in a job post for the first time in recent months?
In the three months to August 2026, 25 companies posted about MCNP for the first time. From March to May, 14 did. The 25 from June to August are 5.4% of all 465 companies whose job posts name it.
March to May 202614
June to August 202625
October 2025 to August 202661
Companies whose first job post naming it appeared in that period. Recruiters, staffing firms and job boards are left out.
How do we know which companies use MCNP?
465 companies name MCNP in job posts they wrote; employees' profiles add 1,144 more. 210 show up in both job posts and employees' profiles.
How we knowCompaniesShare
Job posts name MCNP
46529%
Employees' profiles list MCNP
1,14471%
1,609 companies. Each is counted once, under the strongest evidence we have for it.
What size are the companies that use MCNP?
By size, MCNP users are close to the typical tech page; companies with 50 to 999 employees are the largest group (36%). 388 of its companies have more than 5,000 employees.
Share of its companies
Typical tech page
ShareTypical
Under 50 employees
18%22%
50 to 999
36%38%
1,000 to 5,000
21%17%
Over 5,000
24%23%
Where are MCNP companies based?
France is 2.2 times as common among MCNP companies as on the typical tech page, at 10%. The United States leads overall with 49%. Its companies are based in 70 countries and territories.
ShareTypical
United States
49%43%
France
10%4.6%
United Kingdom
5.7%6.4%
Germany
4%4.4%
Canada
3.5%3.6%
Spain
2.7%1.8%
Companies in 70 countries and territories. Shares are of companies with a known headquarters country.
Show the data
Country
Companies
Share
Typical tech page
United States
748
49%
43%
France
157
10%
4.6%
United Kingdom
88
5.7%
6.4%
Germany
61
4%
4.4%
Canada
54
3.5%
3.6%
Spain
42
2.7%
1.8%
Which teams work with MCNP?
The teams named most often in MCNP job posts are nuclear engineering, engineering and radiation protection.
TeamCompanies
Nuclear engineering
13
Engineering
8
Radiation protection
7
Radiological protection
5
Direction opérationnelle
4
NCS
4
What else do MCNP companies use?
MCNP companies are 727 times as likely as similar companies to use Serpent: 18% of them, against 0.02%. Next is OpenMC: 17% of these companies use it, against 0.02% of similar ones.
Share of the 301 MCNP companies counted here whose job posts also name the tool
Typical for companies the same size
Which companies started naming MCNP in job posts recently?
From April to August 2026, 17 companies with 50 or more employees posted their first job naming MCNP: 12 commercial, 2 mid-market and 3 enterprise. Among the new enterprise companies, Georgia Institute of Technology posted the most jobs naming it: 3.
Companies that named MCNP in a job post for the first time between April and August 2026, ranked by their job posts in those months. AI-native companies get a group of their own, whatever their size. Recruiters and job boards are left out.
Which roles mention MCNP most?
MCNP is showing up in more Nuclear Engineer job posts: 55 from June to August 2026, up from 27 from March to May. The top four roles cover 54% of these job posts.
RoleSharePosts
Nuclear Engineer
24%143
Safety Engineer
16%98
Physicist
10%62
Researcher
4.1%25
Skilled Trades
2.5%15
Engineer
2.3%14
Show the data
Role
Share
Oct 2025 to Aug 2026
Mar to May 2026
Jun to Aug 2026
Nuclear Engineer
24%
143
27
55
Safety Engineer
16%
98
22
28
Physicist
10%
62
21
17
Researcher
4.1%
25
4
11
Skilled Trades
2.5%
15
3
2
Engineer
2.3%
14
3
2
About this data
Sumble built this page. Sumble gives sales, marketing and other GTM teams technographics and hiring signals for the companies they sell to: the technologies each company uses, which teams are hiring and for what, and who reports to whom. That helps a team know who to contact, why now, and what to say.
Sumble covers more than 3.6 million companies, 93 million job posts collected since 2022 and 194 million employee profiles, and tracks more than 37,000 technologies. It finds which technologies a company uses by reading its job posts and its employees' public profiles.
Sumble has a free plan, and the same data is available through its API and MCP server.
A company counts when its own job posts or its employees' public profiles name the technology. Hiring is that technology's share of all job posts collected each month. Quotes are copied word for word from the companies' job posts.
Every figure on this page comes from Sumble's own analysis, and you won't find it outside Sumble.
