1,572 companies use Modbus RTU, based on their job posts and their employees' public profiles. Its share of job posts is growing, and 723 job posts named it from October 2025 to August 2026. Control Engineer roles mention it most.
Which companies name Modbus RTU in the most job posts?
Honeywell Technologies and Schneider Electric have the most job posts naming Modbus RTU, with 247 and 128. Three of these five companies are in Manufacturing.
CompanyPostsPeopleRecent job post
Honeywell TechnologiesManufacturing · first seen Jun 20232473
"Working knowledge of BACnet, BACnet/IP, Modbus RTU, Modbus TCP, MQTT, LonWorks, and other building automation protocols."Building Automation Systems Programmer, Oct 24, 2026
Schneider ElectricUtilities · first seen Feb 202312818
"Implement and troubleshoot IEC 61850, Modbus RTU, Modbus TCP/IP, Profibus, and Ethernet/IP networks, including VLANs, managed switches, and redundancy (RSTP/PRP/HSR where applicable)."Deputy Manager - Field Service Engineer, Nov 7, 2026
EmersonManufacturing · first seen Jun 2023829
"Knowledge of datalinks (Modbus RTU / TCP-IP, ELC, Profibus,OPC)."Senior DCS Engineer, Oct 17, 2026
RRC CompaniesProfessional Services · first seen Oct 2022680
"Experience with industrial communication protocol, such as Modbus RTU, Modbus TCP, DNP3.0, Ethernet/IP, SEL Fast Messaging, IEC 61850, Telnet"Substation P&C Engineer, Feb 4, 2026
Control Panels USA Inc.Manufacturing · first seen Feb 2024500
"EtherIP, DF1, Modbus RTU, Modbus TCP."Process Control Programmer (HMI / PLC / SCADA) - Georgetown, Tx, Mar 22, 2026
A larger share of job posts mentioned Modbus RTU from June to August 2026 than from March to May: 0.44 in every 10,000 job posts, up from 0.31. From October to December 2025 it was 0.35.
Show the data
Month
Job posts naming Modbus RTU
All job posts
Per 10,000
Oct 2025
32
1,413,673
0.23
Nov 2025
65
1,822,119
0.36
Dec 2025
61
1,236,103
0.49
Jan 2026
70
1,828,002
0.38
Feb 2026
83
1,856,647
0.45
Mar 2026
67
1,850,711
0.36
Apr 2026
45
1,728,886
0.26
May 2026
55
1,821,509
0.30
Jun 2026
81
1,909,496
0.42
Jul 2026
76
1,815,180
0.42
Aug 2026
88
1,835,698
0.48
How many companies named Modbus RTU in a job post for the first time in recent months?
In the three months to August 2026, 72 companies posted about Modbus RTU for the first time. From March to May, 37 did. From October 2025 to August 2026, 160 companies named it in a job post for the first time.
March to May 202637
June to August 202672
October 2025 to August 2026160
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 Modbus RTU?
Employees' profiles add 737 companies to the 835 that name Modbus RTU in job posts. 58 show up in both job posts and employees' profiles.
How we knowCompaniesShare
Job posts name Modbus RTU
83553%
Employees' profiles list Modbus RTU
73747%
1,572 companies. Each is counted once, under the strongest evidence we have for it.
What size are the companies that use Modbus RTU?
Companies with 50 to 999 employees are the largest group of Modbus RTU users, at 43%. 399 of its companies have fewer than 50 employees.
Share of its companies
Typical tech page
ShareTypical
Under 50 employees
25%22%
50 to 999
43%38%
1,000 to 5,000
14%17%
Over 5,000
18%23%
Where are Modbus RTU companies based?
Beyond the United States (29%), Modbus RTU is unusually common in Italy, at 4.1% of its companies. India is second, at 9.5%.
ShareTypical
United States
29%43%
India
9.5%6.9%
France
5.7%4.6%
Brazil
5.1%2.8%
Italy
4.1%1.5%
Germany
3.9%4.4%
Companies in 77 countries and territories. Shares are of companies with a known headquarters country.
Show the data
Country
Companies
Share
Typical tech page
United States
435
29%
43%
India
143
9.5%
6.9%
France
86
5.7%
4.6%
Brazil
77
5.1%
2.8%
Italy
62
4.1%
1.5%
Germany
59
3.9%
4.4%
Which teams work with Modbus RTU?
The teams named most often in Modbus RTU job posts are engineering, R&D and automation. Controls and SCADA teams follow, at 5 companies each.
TeamCompanies
Engineering
10
R&D
8
Automation
6
Controls
5
SCADA
5
Division general electric high voltage switchgear
4
What else do Modbus RTU companies use?
27% of Modbus RTU companies also use RS485, against 0.77% of similar companies. Next is HART: 9.9% of these companies use it, against 0.35% of similar ones.
Share of the 628 Modbus RTU companies counted here whose job posts also name the tool
Typical for companies the same size
Which companies started naming Modbus RTU in job posts recently?
54 companies with 50 or more employees started naming Modbus RTU in job posts between April and August 2026. 12 of them have more than 5,000 employees. Socomec Group has the most job posts of the new mid-market companies, 5 from April to August.
Companies that named Modbus RTU 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 Modbus RTU most?
Control Engineer and Systems Engineer roles account for 27% of the job posts that name Modbus RTU. Control Engineer posts naming it numbered 25 from March to May 2026 and 37 from June to August.
RoleSharePosts
Control Engineer
17%121
Systems Engineer
11%76
Skilled Trades
9.3%67
Automation Engineer
7.6%55
Firmware Engineer
5.1%37
Customer Engineer
5%36
Show the data
Role
Share
Oct 2025 to Aug 2026
Mar to May 2026
Jun to Aug 2026
Control Engineer
17%
121
25
37
Systems Engineer
11%
76
18
25
Skilled Trades
9.3%
67
19
13
Automation Engineer
7.6%
55
15
20
Firmware Engineer
5.1%
37
7
16
Customer Engineer
5%
36
11
13
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.
