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.
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.
CompanyPostsPeopleRecent job post
Raytheon TechnologiesManufacturing · first seen Jun 202347645
"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 MartinManufacturing · first seen Jul 202232867
"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
AppleScientific and Technical Services · first seen Sep 2022303254
"3+ years of experience with EM simulation software such as CST, ANSYS, EMCoS, and/or COMSOL."emc design technologist, Nov 1, 2026
Northrop GrummanManufacturing · first seen Jul 202229744
"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 ConnectivityManufacturing · first seen Oct 202225925
"Proficient with signal integrity analysis tools (Agilent ADS, Ansys HFSS, CST, or equivalent tools)"principal r&d/product dvl engineer, Nov 7, 2026
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.
Show the data
Month
Job posts naming CST
All job posts
Per 10,000
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.
March to May 2026132
June to August 2026140
October 2025 to August 2026426
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 knowCompaniesShare
Job posts name CST
2,02315%
Employees' profiles list CST
11,26885%
13,291 companies. Each is counted once, under the strongest evidence we have for it.
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%.
Share of its companies
Typical tech page
ShareTypical
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.
ShareTypical
United States
28%43%
India
11%6.9%
Brazil
7.8%2.8%
United Kingdom
4.9%6.4%
Germany
4.9%4.4%
France
4.4%4.6%
Companies in 129 countries and territories. Shares are of companies with a known headquarters country.
Show the data
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.
TeamCompanies
Engineering
45
R&D
30
RF
26
Hardware
17
Hardware engineering
16
Antenna
13
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%.
Share of the 1,416 CST companies counted here whose job posts also name the tool
Typical for companies the same size
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.
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.
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.
RoleSharePosts
Electrical Engineer
27%891
Hardware Engineer
8.7%288
Telecommunications Engineer
7.8%259
Engineer
4.1%136
Chip Designer
3.1%104
Systems Engineer
2.8%91
Show the data
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
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.
