| 1 | Bell Power Inc. | | USA |
| 2 | Evapar | | USA |
| 3 | Waukesha-Pearce Industries Inc. | | USA |
| 4 | SES Arrow Manufacturing | | USA |
| 5 | Buck's Engine Co. | | USA |
| 6 | Coates International | | USA |
| 7 | Surplus Record Machinery & Electrical Equipment | | USA |
| 8 | Governors America Corp. (GAC) | | USA |
| 9 | Compressor Engineering Corp. (CECO) | | USA |
| 10 | Innio | | USA |
| 11 | Dearing Compressor & Pump Co. | | USA |
| 12 | C&I Power Solutions | | USA |
| 13 | Cummins Inc. | | USA |
| 14 | Wajax Limited | | USA |
| 15 | Caterpillar Inc. | | USA |
| 16 | Cummins Onan | | USA |
| 17 | Westport Innovations Inc | | USA |
| 18 | Honda Engines Group | | USA |
| 19 | Weichai America Corp. | | USA |
| 20 | Tech 3 Solutions Inc. | | USA |
| 21 | OilPro Oilfield Production Equipment Ltd. | | USA |
| 22 | Cyclone Power Technologies Inc. | | USA |
| 23 | Kubota Engine America Corporation | | USA |
| 24 | Origin Engines | | USA |
| 25 | Natural Gas Vehicles International | | USA |
| 26 | BioWorks Energy LLC | | USA |
| 27 | Tech Development Inc. | | USA |
| 28 | Enpro Industries | | USA |
| 29 | Perkins Engines Company Limited | | USA |
| 30 | Production Engine & Pump Inc. | | USA |
| 31 | Solar Turbines Incorporated | | USA |
