| S.no | Company Name | Founded | Country |
|---|---|---|---|
| 1 | Siemens Process Instrumentation | USA | |
| 2 | Marsh Bellofram & Marshalltown Dist. – M & M Control | USA | |
| 3 | PICS INC | USA | |
| 4 | Hampton Controls Inc. | USA | |
| 5 | Fairchild Industrial Products a Rotork Instruments company | USA | |
| 6 | ControlAir Inc. | USA | |
| 7 | TE Connectivity | USA | |
| 8 | Landis & Gyr Authorized Siemens Building Technologies Dist. of M & M Control | USA | |
| 9 | K-Hill Signal CO Inc | USA | |
| 10 | Danaher Specialty Products – Veeder-Root Namco Controls Joslyn Clark | USA |
