Largest Automation Companies Explained: Who Leads Industrial Automation and Why
Key takeaway: The largest automation companies are Siemens, ABB, Schneider Electric, Rockwell Automation and Emerson, with Mitsubishi Electric, Honeywell, Fanuc and Omron close behind. Siemens leads most broad rankings of industrial automation, but no single company leads every segment — the right choice depends on whether you need factory, process, robotics or energy automation.
Search for the largest automation companies and you will find several different answers, and that is not a mistake. Rankings change depending on what is being measured: total company revenue, automation-only revenue, PLC market share, or robotics shipments. This article explains who the biggest players actually are, what each one is best at, and how to use that information if you are choosing a supplier.
Who are the largest automation companies?
Across the major industry rankings, the same names appear at the top. The Business Research Company’s Industrial Automation Global Market Report 2026 found that Siemens led global sales in 2024 with a 4% market share, followed by Schneider Electric and ABB at 4% each, Rockwell Automation at 3%, and Emerson and Mitsubishi Electric at 2% each. The top 10 players together accounted for just 25% of total market revenue, which means the market is surprisingly fragmented despite the famous names at the top.
IoT Analytics, which mapped more than 4,000 published industrial automation projects from five leading vendors, describes Siemens as the world’s largest industrial automation company. Its published projects skew heavily toward machinery and equipment (38%) and toward Europe, the Middle East and Africa (76%), a reminder that even the biggest vendor has a home turf.
The biggest names, and what each one does best
Siemens (Germany). The broadest automation portfolio in the industry, built around its Digital Industries business, which reported revenue of EUR 17,788 million in the fiscal year to September 30, 2025, according to an industry guide compiling company filings. Its TIA Portal engineering platform and Simatic controllers are the default choice in much of European and Asian manufacturing.
ABB (Switzerland). Strong in robotics, electrification and process automation, with an automation business area reporting $8,084 million in 2025 revenue. In 2026 ABB agreed to sell its robotics division to SoftBank for an enterprise value of $5,375 million, with the sale expected to close in the fourth quarter of 2026 — a deal that will reshape ABB’s profile, so check the current structure before assuming robotics is still part of it.
Schneider Electric (France). A leader in energy management as well as industrial automation, with its industrial automation business reporting EUR 7,022 million in 2025 revenue. Its EcoStruxure platform is widely used in process industries, discrete manufacturing and infrastructure. Schneider also took the top spot in ABI Research’s 2026 software-defined automation ranking, ahead of Siemens and Bosch Rexroth.
Rockwell Automation (United States). The most focused of the giants: almost everything it does is automation. Its Allen-Bradley controllers and FactoryTalk software dominate North American factories, and the company reported whole-company revenue of $8,342 million in the fiscal year to September 30, 2025.
Emerson (United States). The process-industry specialist, strongest in oil and gas, chemicals, life sciences and other continuous processes. Its Intelligent Devices plus Software and Control businesses reported $18,016 million in revenue in the year to September 30, 2025.
Mitsubishi Electric, Honeywell, Fanuc and Omron. Mitsubishi’s Factory Automation Systems business reported JPY 875,600 million in the year to March 31, 2026, and is especially strong in Asia. Honeywell’s Industrial Automation segment reported $9,401 million in 2025. Fanuc, the robotics and CNC specialist, reported whole-company revenue of JPY 857,831 million in the year to March 31, 2026, while Omron is a major force in machine automation and sensors.
Comparison: the largest automation companies at a glance
| Company | Home country | Automation strength | Best known for |
|---|---|---|---|
| Siemens | Germany | Factory and process automation, software | Simatic PLCs, TIA Portal, digital twins |
| ABB | Switzerland | Robotics, electrification, process automation | Industrial robots, drives, control systems |
| Schneider Electric | France | Energy management, industrial automation | EcoStruxure, Modicon PLCs, software-defined automation |
| Rockwell Automation | United States | Factory automation, software | Allen-Bradley PLCs, FactoryTalk |
| Emerson | United States | Process automation | DeltaV control systems, measurement instruments |
| Mitsubishi Electric | Japan | Factory automation | Melsec PLCs, servo systems, CNC |
| Fanuc | Japan | Robotics, CNC | Industrial robots, machine controllers |
| Honeywell | United States | Process and building automation | Experion control systems, sensors |
Note the revenue figures above are not directly comparable: some cover a whole company, others only an automation segment, and fiscal years differ. Treat the table as a guide to scale and focus, not a precise league table.
How the largest automation companies compare on approach
Siemens and Rockwell Automation compete most directly in factory automation, with Siemens stronger in Europe and Asia and Rockwell stronger in North America. Emerson and ABB compete most directly in process automation, where long service histories and installed equipment matter as much as new technology. Schneider Electric stands apart by tying automation to energy management, which matters most for plants trying to cut energy costs. Fanuc stands apart by specialising: it does robots and machine controllers better than anyone, but does not try to automate a whole plant the way Siemens or ABB does.
The newest battleground is software-defined automation, where control software runs on standard hardware instead of dedicated controllers. ABI Research’s 2026 ranking put Schneider Electric first, Siemens second and Bosch Rexroth third, and projected software-defined automation controller revenue growing from $500 million in 2025 to $4.7 billion by 2035. For buyers, this shift matters because it promises more flexibility and lower hardware lock-in, but the technology is still maturing.
How much does industrial automation cost?
There is no standard price for industrial automation, because cost depends on scope, not brand. A single PLC-based machine upgrade can cost a few thousand dollars, while a full plant-wide control system runs into millions. The honest way to compare vendors is total cost over the system’s life: hardware, engineering, software licences, integration, training and years of support. Large vendors often charge more upfront but offer longer support horizons and wider service networks, which is why factories running 24/7 tend to favour them. Smaller vendors and system integrators can be cheaper for a single machine or line, but may lack global support. Always get quotes for the same defined scope before comparing prices.
What you need before choosing an automation vendor
Before talking to any vendor, define three things: the process you are automating, the equipment already installed, and the skills your team has. A plant already running Siemens controllers will usually find a Siemens upgrade cheaper and faster than switching brands, because retraining and re-engineering cost more than the hardware. The same logic applies to Rockwell in North America or Mitsubishi in Asia. Also check local support: a vendor with engineers in your region will resolve downtime far faster than one that flies specialists in. If you are new to automation, start with a system integrator rather than going direct — integrators work across brands and will recommend the platform that fits your plant, not their product catalogue. For background on how connected machines work together, see our explainers on industrial automation in IoT, automation bots and custom factory automation.
Risks and limits of going with a giant
Size brings risks as well as reassurance. Vendor lock-in is the biggest: once a plant standardises on one supplier’s controllers and software, switching becomes expensive, which weakens your negotiating position on future upgrades. Large vendors also move slowly on niche needs, and their product lines change through acquisitions and divestments — ABB’s 2026 robotics sale is a live example of how a vendor’s portfolio can shift under you. Finally, the biggest vendors focus on large customers; small plants sometimes get slower service and less attention than they would from a mid-sized specialist. Mitigate these risks by insisting on open standards where possible, keeping documentation in-house, and avoiding single-vendor dependence for your most critical systems.
Why it matters
The largest automation companies shape what factories can build, how much energy industry uses, and how fast manufacturing adopts AI. Their platforms decide which software tools work together, their service networks decide how quickly a broken line gets fixed, and their research spending decides whether the next generation of factories is more flexible or more locked-in. Understanding who they are — and where each one is actually strong — is the first step to making a good buying decision rather than simply buying the biggest name.
Analysis: market-share figures differ between research firms because they measure different slices of automation (whole companies, automation segments, or specific products like PLCs). The rankings above reflect the broad consensus across sources, not any single firm’s list. Figures attributed to company filings are segment revenues as compiled by an industry guide, not whole-company totals, and fiscal years differ between vendors.
Frequently asked questions
Who is the largest automation company in the world?
Siemens is the largest automation company by most broad measures, leading global industrial automation sales in 2024 according to The Business Research Company and described as the world’s largest industrial automation company by IoT Analytics. Schneider Electric and ABB are close behind, and the exact order changes depending on whether whole-company or automation-only revenue is counted.
Which automation company is best for factories?
For discrete manufacturing such as cars, machinery and consumer goods, Siemens and Rockwell Automation are usually the strongest choices, with Siemens leading in Europe and Asia and Rockwell leading in North America. For process industries such as chemicals, oil and gas and food production, Emerson and ABB are typically stronger. The best choice depends on your existing equipment, your region and the skills of your team.
What do the largest automation companies sell?
They sell controllers such as PLCs and DCS systems, industrial software including SCADA and engineering platforms, robots, drives, motors, sensors and instruments, plus integration and long-term support services. Most also sell digital tools such as digital twins, analytics and AI-assisted maintenance that sit on top of the physical control hardware.
How much does industrial automation cost?
Costs range from a few thousand dollars for a single machine upgrade to millions for a plant-wide system, depending on scope, complexity and support needs. Compare vendors on total lifetime cost — hardware, engineering, software licences, training and support — rather than the upfront hardware price alone, and get quotes for the same defined scope.
Should a small business buy from a large automation vendor?
Not always. Large vendors offer long support horizons and wide service networks, which suit plants that run around the clock. Small businesses with a single line or machine may get better value from a mid-sized vendor or a system integrator that works across brands, as long as support and spare parts are guaranteed. Standardising on one major platform still makes sense if you plan to expand.
Sources
- The Business Research Company, Industrial Automation Global Market Report 2026 (via EIN Presswire)
- Joltek, Industrial Automation by Industry (company-filing revenue compilation, checked October 2026)
- IoT Analytics, Mapping 4,000 Global Industrial Automation Projects
- ABI Research Software-Defined Automation Ranking, October 2026 (via Technology For You)
