# Companies using MCNP

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.

Data as of November 9, 2026. Source: Sumble.

## Which companies name MCNP in the most job posts?

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.

| Company | Job posts | People | Recent job post |
|---|---:|---:|---|
| [Framatome](https://sumble.com/orgs/framatome) | 125 | 60 | "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) |
| [Orano](https://sumble.com/orgs/orano) | 121 | 21 | "…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 Laboratory](https://sumble.com/orgs/oak-ridge-national-laboratory) | 110 | 41 | "…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 Laboratory](https://sumble.com/orgs/los-alamos-national-laboratory) | 105 | 105 | "Perform criticality safety calculations using MCNP and other Monte Carlo transport codes" (Criticality Safety Analyst 4/5, Oct 21, 2026) |
| [Westinghouse Electric Company](https://sumble.com/orgs/westinghouse-electric) | 75 | 35 | "Relevant computer codes like MCNP, SCALE, or similar" (Nuclear Engineer II (Hybrid), Aug 12, 2025) |

## Is hiring for MCNP growing?

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.

| Month | Job posts naming it | All job posts | Per 10,000 job posts |
|---|---:|---:|---:|
| 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.

| Period | Companies naming it in a job post for the first time |
|---|---:|
| March to May 2026 | 14 |
| June to August 2026 | 25 |
| October 2025 to August 2026 | 61 |

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 know | Companies | Share |
|---|---:|---:|
| Job posts name MCNP | 465 | 29% |
| Employees' profiles list MCNP | 1,144 | 71% |

## 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.

| Size | Share | Typical tech page |
|---|---:|---:|
| 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.

| 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.

| Team | Companies |
|---|---:|
| Nuclear engineering | 13 |
| Engineering | 8 |
| Radiation protection | 7 |
| Radiological protection | 5 |
| Direction opérationnelle | 4 |
| NCS | 4 |

## 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.

| 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 |

## 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.

| Group | Company | Job posts, April to August 2026 |
|---|---|---:|
| Commercial | [Groupe D&S](https://sumble.com/orgs/d&s-groupe) | 2 |
| Commercial | [IMDEA Energy](https://sumble.com/orgs/imdea-energy) | 2 |
| Commercial | [Core4ce](https://sumble.com/orgs/core4ce-com) | 1 |
| Commercial | [Tracerco](https://sumble.com/orgs/tracerco) | 1 |
| Commercial | [Theragenics Corporation](https://sumble.com/orgs/theragenics) | 1 |
| Enterprise | [Georgia Institute of Technology](https://sumble.com/orgs/georgia-tech) | 3 |
| Enterprise | [Fluor Corporation](https://sumble.com/orgs/fluor) | 1 |
| Enterprise | [Expleo Group](https://sumble.com/orgs/expleo-group) | 1 |

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.

## 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.

| Tool | Companies | Also name it | Typical | Times as common |
|---|---:|---:|---:|---:|
| Serpent | 54 | 18% | 0.02% | 727 times |
| OpenMC | 52 | 17% | 0.02% | 704 times |
| PipeStress | 22 | 7.3% | 0.05% | 135 times |
| AutoPipe | 38 | 13% | 0.17% | 73 times |
| Capella | 18 | 6% | 0.1% | 62 times |
| AFT Fathom | 17 | 5.6% | 0.1% | 54 times |
| SmartPlant | 28 | 9.3% | 0.18% | 52 times |
| FEMAP | 29 | 9.6% | 0.19% | 51 times |

Shares are out of the 301 companies whose job posts name MCNP, not counting firms whose job posts name almost every technology.

## 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.