# Companies using Modbus RTU

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.

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

## 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.

| Company | Job posts | People | Recent job post |
|---|---:|---:|---|
| [Honeywell Technologies](https://sumble.com/orgs/honeywell) | 247 | 3 | "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 Electric](https://sumble.com/orgs/schneider-electric) | 128 | 18 | "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) |
| [Emerson](https://sumble.com/orgs/emerson) | 82 | 9 | "Knowledge of datalinks (Modbus RTU / TCP-IP, ELC, Profibus,OPC)." (Senior DCS Engineer, Oct 17, 2026) |
| [RRC Companies](https://sumble.com/orgs/rrc-power-&-energy) | 68 | 0 | "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.](https://sumble.com/orgs/control-panels-usa) | 50 | 0 | "EtherIP, DF1, Modbus RTU, Modbus TCP." (Process Control Programmer (HMI / PLC / SCADA) - Georgetown, Tx, Mar 22, 2026) |

## Is hiring for Modbus RTU growing?

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.

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

| Period | Companies naming it in a job post for the first time |
|---|---:|
| March to May 2026 | 37 |
| June to August 2026 | 72 |
| October 2025 to August 2026 | 160 |

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 know | Companies | Share |
|---|---:|---:|
| Job posts name Modbus RTU | 835 | 53% |
| Employees' profiles list Modbus RTU | 737 | 47% |

## 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.

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

| 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.

| Team | Companies |
|---|---:|
| Engineering | 10 |
| R&D | 8 |
| Automation | 6 |
| Controls | 5 |
| SCADA | 5 |
| Division general electric high voltage switchgear | 4 |

## 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.

| 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 |

## 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.

| Group | Company | Job posts, April to August 2026 |
|---|---|---:|
| Commercial | [Apptad](https://sumble.com/orgs/apptad) | 4 |
| Commercial | [SUNOTEC](https://sumble.com/orgs/sunotec) | 4 |
| Commercial | [Sunreef Yachts](https://sumble.com/orgs/sunreef-yachts) | 3 |
| Commercial | [SJE Inc.](https://sumble.com/orgs/sje) | 2 |
| Commercial | [Valar Atomics](https://sumble.com/orgs/valar-atomics) | 2 |
| Mid-market | [Socomec Group](https://sumble.com/orgs/socomec) | 5 |
| Mid-market | [Delta Electronics India](https://sumble.com/orgs/delta-electronics-india) | 2 |
| Mid-market | [Veolia \| North America](https://sumble.com/orgs/veolianorthamerica) | 1 |
| Mid-market | [Sungrow](https://sumble.com/orgs/sungrow-emea) | 1 |
| Mid-market | [Enel X](https://sumble.com/orgs/enelx) | 1 |
| Enterprise | [Oracle](https://sumble.com/orgs/oracle) | 2 |
| Enterprise | [Hitachi Energy](https://sumble.com/orgs/hitachi-energy) | 2 |
| Enterprise | [Deloitte](https://sumble.com/orgs/deloitte) | 1 |
| Enterprise | [CBRE](https://sumble.com/orgs/cbre) | 1 |
| Enterprise | [Thales](https://sumble.com/orgs/thales) | 1 |

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.

## 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.

| Tool | Companies | Also name it | Typical | Times as common |
|---|---:|---:|---:|---:|
| RS485 | 171 | 27% | 0.77% | 35 times |
| HART | 62 | 9.9% | 0.35% | 28 times |
| Modbus | 506 | 81% | 3.1% | 26 times |
| DNP3 | 88 | 14% | 0.53% | 26 times |
| Ethernet/IP | 251 | 40% | 1.5% | 26 times |
| Modicon | 42 | 6.7% | 0.26% | 26 times |
| BACnet | 130 | 21% | 0.84% | 25 times |
| Profinet | 211 | 34% | 1.4% | 24 times |

Shares are out of the 628 companies whose job posts name Modbus RTU, 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.