| S.no | Company Name | Founded | Country |
|---|---|---|---|
| 1 | Hema Driveline and Hydraulics Inc. | USA | |
| 2 | A/M Air Starter Sales & Service | USA | |
| 3 | Michigan CAT | USA | |
| 4 | Nivel | USA | |
| 5 | Caterpillar Inc. | USA | |
| 6 | Scuderi Group | USA | |
| 7 | Honda Engines Group | USA | |
| 8 | Workhorse Group Inc. | USA | |
| 9 | Scania U.S.A. Inc. | USA | |
| 10 | AB Engine | USA | |
| 11 | Zed Engines | USA | |
| 12 | Solar Turbines Incorporated | USA | |
| 13 | Natural Gas Vehicles International | USA | |
| 14 | Cyclone Power Technologies Inc. | USA | |
| 15 | Greenkraft Inc. | USA | |
| 16 | Marshall Engines | USA | |
| 17 | Dealer’s Mfg. Co. | USA | |
| 18 | Great Lakes Diesel | USA | |
| 19 | Recon Automotive Remanufacturers Inc | USA |
