# Companies using CST

13,291 companies use CST, based on their job posts and their employees' public profiles. Its share of job posts is growing, and 3,309 job posts named it from October 2025 to August 2026. Electrical Engineer roles mention it most.

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

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

Raytheon Technologies leads with 476 job posts naming CST, followed by Lockheed Martin and Apple. Raytheon Technologies is the newest of the five companies in the table, with its first job post naming it in June 2023.

| Company | Job posts | People | Recent job post |
|---|---:|---:|---|
| [Raytheon Technologies](https://sumble.com/orgs/raytheon) | 476 | 45 | "Hands-on experience with electromagnetic simulation tools such as HFSS, ADS, CST, or Mentor Graphics’ Xpedition and analytical tools such as Matlab" (Antenna and Microwave Design Section Lead, Nov 6, 2026) |
| [Lockheed Martin](https://sumble.com/orgs/lockheed-martin) | 328 | 67 | "RF performance simulation (ADS, AWR, SystemVue, or equivalent) and Full-Wave simulation experience (CST, HFSS, or equivalent)" (RF Engineer Stf (Level IV) - Secret clearance, Oct 24, 2026) |
| [Apple](https://sumble.com/orgs/apple) | 303 | 254 | "3+ years of experience with EM simulation software such as CST, ANSYS, EMCoS, and/or COMSOL." (emc design technologist, Nov 1, 2026) |
| [Northrop Grumman](https://sumble.com/orgs/northrop-grumman) | 297 | 44 | "Familiarity with RF analysis tools such as HFSS, CST Microwave Studio, GRASP10, and CHAMP." (Principal/Sr. Principal RF Microwave Design Engineer (Level 3 or 4), Nov 2, 2026) |
| [TE Connectivity](https://sumble.com/orgs/te-connectivity) | 259 | 25 | "Proficient with signal integrity analysis tools (Agilent ADS, Ansys HFSS, CST, or equivalent tools)" (principal r&d/product dvl engineer, Nov 7, 2026) |

## Is hiring for CST growing?

CST turned up in a growing share of job posts: 1.9 in every 10,000 job posts from June to August 2026, compared with 1.7 from March to May. August 2026 was its highest month since October 2025, at 2.1.

| Month | Job posts naming it | All job posts | Per 10,000 job posts |
|---|---:|---:|---:|
| Oct 2025 | 222 | 1,413,673 | 1.6 |
| Nov 2025 | 295 | 1,822,119 | 1.6 |
| Dec 2025 | 206 | 1,236,103 | 1.7 |
| Jan 2026 | 261 | 1,828,002 | 1.4 |
| Feb 2026 | 318 | 1,856,647 | 1.7 |
| Mar 2026 | 302 | 1,850,711 | 1.6 |
| Apr 2026 | 302 | 1,728,886 | 1.7 |
| May 2026 | 319 | 1,821,509 | 1.8 |
| Jun 2026 | 360 | 1,909,496 | 1.9 |
| Jul 2026 | 346 | 1,815,180 | 1.9 |
| Aug 2026 | 378 | 1,835,698 | 2.1 |

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

140 companies named CST in a job post for the first time from June to August 2026, against 132 from March to May. Of the 2,023 companies whose job posts name it, 6.9% first named it from June to August.

| Period | Companies naming it in a job post for the first time |
|---|---:|
| March to May 2026 | 132 |
| June to August 2026 | 140 |
| October 2025 to August 2026 | 426 |

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 CST?

2,023 companies name CST in their own job posts. The other 11,268 show up because employees list it on their profiles. 899 show up in both job posts and employees' profiles.

| How we know | Companies | Share |
|---|---:|---:|
| Job posts name CST | 2,023 | 15% |
| Employees' profiles list CST | 11,268 | 85% |

## What size are the companies that use CST?

By size, the biggest group of CST users is companies with 50 to 999 employees, at 45%. The second-largest group is companies with fewer than 50 employees, at 20%.

| Size | Share | Typical tech page |
|---|---:|---:|
| Under 50 employees | 20% | 22% |
| 50 to 999 | 45% | 38% |
| 1,000 to 5,000 | 20% | 17% |
| Over 5,000 | 14% | 23% |

## Where are CST companies based?

Brazil is 2.8 times as common among CST companies as on the typical tech page, at 7.8%. The United States leads overall with 28%. Its companies are based in 129 countries and territories.

| Country | Companies | Share | Typical tech page |
|---|---:|---:|---:|
| United States | 3,626 | 28% | 43% |
| India | 1,459 | 11% | 6.9% |
| Brazil | 988 | 7.8% | 2.8% |
| United Kingdom | 630 | 4.9% | 6.4% |
| Germany | 623 | 4.9% | 4.4% |
| France | 566 | 4.4% | 4.6% |

## Which teams work with CST?

CST turns up most in job posts for engineering, R&D and RF teams. Next are hardware and hardware engineering teams, at 17 and 16 companies.

| Team | Companies |
|---|---:|
| Engineering | 45 |
| R&D | 30 |
| RF | 26 |
| Hardware | 17 |
| Hardware engineering | 16 |
| Antenna | 13 |

## Which roles mention CST most?

Electrical Engineer roles lead with 27% of job posts naming CST, but Hardware Engineer roles are catching up: 82 from June to August 2026, against 50 from March to May. The top four roles cover 48% of these job posts.

| Role | Share | Oct 2025 to Aug 2026 | Mar to May 2026 | Jun to Aug 2026 |
|---|---:|---:|---:|---:|
| Electrical Engineer | 27% | 891 | 264 | 275 |
| Hardware Engineer | 8.7% | 288 | 50 | 82 |
| Telecommunications Engineer | 7.8% | 259 | 77 | 91 |
| Engineer | 4.1% | 136 | 29 | 37 |
| Chip Designer | 3.1% | 104 | 26 | 29 |
| Systems Engineer | 2.8% | 91 | 22 | 27 |

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

135 companies with 50 or more employees started naming CST in job posts between April and August 2026. 25 of them have more than 5,000 employees. Another 3 were AI-native companies, which we list separately.

| Group | Company | Job posts, April to August 2026 |
|---|---|---:|
| AI native | [Helsing](https://sumble.com/orgs/helsing) | 4 |
| AI native | [Root Access](https://sumble.com/orgs/root-access-ai) | 2 |
| AI native | [PhysicsX](https://sumble.com/orgs/physicsx) | 1 |
| Commercial | [Xcimer Energy](https://sumble.com/orgs/xcimer-energy) | 8 |
| Commercial | [TPS Group](https://sumble.com/orgs/grouptps) | 6 |
| Commercial | [Skorpios Technologies, Inc.](https://sumble.com/orgs/skorpios-technologies) | 4 |
| Commercial | [Nexio SAS](https://sumble.com/orgs/nexio-9) | 4 |
| Commercial | [Viettel High Tech](https://sumble.com/orgs/viettel-high-tech) | 3 |
| Mid-market | [WNC Corporation](https://sumble.com/orgs/w-neweb) | 7 |
| Mid-market | [Grupo Muffato](https://sumble.com/orgs/grupo-muffato) | 4 |
| Mid-market | [Agibank](https://sumble.com/orgs/agibank) | 3 |
| Mid-market | [New York State Office of Mental Health](https://sumble.com/orgs/new-york-state-office-of-mental-health) | 3 |
| Mid-market | [Clarios](https://sumble.com/orgs/clarios) | 2 |
| Enterprise | [UPS](https://sumble.com/orgs/ups) | 3 |
| Enterprise | [Koch](https://sumble.com/orgs/koch-industries) | 3 |
| Enterprise | [MediaTek](https://sumble.com/orgs/mediatek-india-technology) | 3 |
| Enterprise | [OMRON Group](https://sumble.com/orgs/omron) | 3 |
| Enterprise | [Broadcom](https://sumble.com/orgs/broadcom) | 2 |

Companies that named CST 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 CST companies use?

FEKO, Microwave Office and HFSS show up far more often at CST companies than at companies of the same size. Keysight ADS is 126 times as common as usual, at 12%.

| Tool | Companies | Also name it | Typical | Times as common |
|---|---:|---:|---:|---:|
| FEKO | 179 | 13% | 0.07% | 175 times |
| Microwave Office | 125 | 8.8% | 0.06% | 159 times |
| HFSS | 778 | 55% | 0.35% | 156 times |
| Keysight ADS | 173 | 12% | 0.1% | 126 times |
| Ansys HFSS | 303 | 21% | 0.17% | 124 times |
| Petalinux | 78 | 5.5% | 0.07% | 81 times |
| Questa | 105 | 7.4% | 0.13% | 58 times |
| Vivado | 225 | 16% | 0.28% | 57 times |

Shares are out of the 1,416 companies whose job posts name CST, 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.