# Companies using Serpent

471 companies in our data use Serpent, and 92 of them name it in job posts they wrote. From October 2025 to August 2026, 144 job posts named it. Nuclear Engineer is the role that names it most often.

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

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

The five companies with the most job posts naming Serpent are Framatome, Oak Ridge National Laboratory, Westinghouse Electric Company, Terrestrial Energy and Hadron Energy, Inc. Of the five companies in the table, Framatome has the most employees who list it on their profiles: 20.

| Company | Job posts | People | Recent job post |
|---|---:|---:|---|
| [Framatome](https://sumble.com/orgs/framatome) | 70 | 20 | "You have some experience in computer model development and application (e.g., SCALE, SERPENT, MCNP, or other nuclear industry analysis code)." (Fluence & Radiological Engineer, Sep 20, 2025) |
| [Oak Ridge National Laboratory](https://sumble.com/orgs/oak-ridge-national-laboratory) | 41 | 5 | "…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) |
| [Westinghouse Electric Company](https://sumble.com/orgs/westinghouse-electric) | 40 | 6 | "Expert experience with Monte Carlo nuclear analysis codes such as Serpent, MCNP, and SCALE and working knowledge for other codes such as Griffin and Bison." (Lead - Nuclear Design Engineer, Jul 27, 2025) |
| [Terrestrial Energy](https://sumble.com/orgs/terrestrial-energy) | 28 | 0 | "Knowledge of neutronics codes (MCNP, SCALE, Serpent, or similar)" (Nuclear Safety Analysis Manager, Aug 27, 2026) |
| [Hadron Energy, Inc.](https://sumble.com/orgs/hadronenergy) | 27 | 0 | "Experience with activation, depletion, and source term characterization codes (e.g., SCALE/ORIGEN, Serpent)" (Radiation Effects & Shielding Specialist, Jul 28, 2026) |

## Is hiring for Serpent growing?

From March to May 2026, 0.06 in every 10,000 job posts named Serpent; from June to August, 0.08 in every 10,000 job posts. These are small numbers of job posts, so a few companies can move them.

| Month | Job posts naming it | All job posts | Per 10,000 job posts |
|---|---:|---:|---:|
| Oct 2025 | 14 | 1,413,673 | 0.10 |
| Nov 2025 | 20 | 1,822,119 | 0.11 |
| Dec 2025 | 5 | 1,236,103 | 0.04 |
| Jan 2026 | 14 | 1,828,002 | 0.08 |
| Feb 2026 | 15 | 1,856,647 | 0.08 |
| Mar 2026 | 9 | 1,850,711 | 0.05 |
| Apr 2026 | 15 | 1,728,886 | 0.09 |
| May 2026 | 8 | 1,821,509 | 0.04 |
| Jun 2026 | 11 | 1,909,496 | 0.06 |
| Jul 2026 | 13 | 1,815,180 | 0.07 |
| Aug 2026 | 20 | 1,835,698 | 0.11 |

## How many companies named Serpent in a job post for the first time in recent months?

From June to August 2026, 10 companies posted their first job naming Serpent; 3 did from March to May. Of the 92 companies whose job posts name it, 11% first named it from June to August.

| Period | Companies naming it in a job post for the first time |
|---|---:|
| March to May 2026 | 3 |
| June to August 2026 | 10 |
| October 2025 to August 2026 | 20 |

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 Serpent?

Of the 471 companies here, 379 are known from what employees list on their profiles. 92 name it in their own job posts.

| How we know | Companies | Share |
|---|---:|---:|
| Job posts name Serpent | 92 | 20% |
| Employees' profiles list Serpent | 379 | 80% |

## What size are the companies that use Serpent?

By size, Serpent users are close to the typical tech page; companies with 50 to 999 employees are the largest group (35%). 109 of its companies have more than 5,000 employees.

| Size | Share | Typical tech page |
|---|---:|---:|
| Under 50 employees | 23% | 22% |
| 50 to 999 | 35% | 38% |
| 1,000 to 5,000 | 19% | 17% |
| Over 5,000 | 23% | 23% |

## Where are Serpent companies based?

Beyond the United States (35%), Serpent is unusually common in France, at 18% of its companies. Its companies are based in 48 countries and territories.

| Country | Companies | Share | Typical tech page |
|---|---:|---:|---:|
| United States | 156 | 35% | 43% |
| France | 79 | 18% | 4.6% |
| United Kingdom | 30 | 6.7% | 6.4% |
| Sweden | 16 | 3.6% | 1% |
| Canada | 15 | 3.3% | 3.6% |
| India | 13 | 2.9% | 6.9% |

## Which roles mention Serpent most?

Nuclear Engineer and Safety Engineer roles account for 53% of the job posts that name Serpent. The top four roles cover 64% of these job posts.

| Role | Share | Oct 2025 to Aug 2026 | Mar to May 2026 | Jun to Aug 2026 |
|---|---:|---:|---:|---:|
| Nuclear Engineer | 36% | 52 | 9 | 20 |
| Safety Engineer | 17% | 25 | 5 | 6 |
| Engineer | 6.2% | 9 | 2 | 2 |
| Environmental Health & Safety | 4.2% | 6 | 0 | 0 |
| Skilled Trades | 4.2% | 6 | 1 | 1 |
| Researcher | 3.5% | 5 | 0 | 3 |

## Which companies started naming Serpent in job posts recently?

Between April and August 2026, Serpent appeared for the first time in job posts at 5 companies: 3 commercial, 1 mid-market and 1 enterprise.

| Group | Company | Job posts, April to August 2026 |
|---|---|---:|
| Commercial | [Focused Energy](https://sumble.com/orgs/concentrated-energy-universe) | 2 |
| Commercial | [IMDEA Energy](https://sumble.com/orgs/imdea-energy) | 2 |
| Commercial | [Thea Energy](https://sumble.com/orgs/thea) | 1 |

Companies that named Serpent 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.

## 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.