| Symbol | Name | Country | Exchange |
|---|---|---|---|
| CAT | Caterpillar, Inc. | US | NYSE |
| CMI | Cummins Inc. | US | NYSE |
| CYD | China Yuchai International Limited | US | NYSE |
| WPRT | Westport Innovations Inc | US | NASDAQ |
| IHICY | IHI Corporation | US | OTC |
| MIESY | Mitsui E&S Holdings Ltd | US | OTC |
| OMTK | Omnitek Engineering Corp | US | OTC |
| SMEGF | Siemens Energy Ag | US | OTC |
| SMNEY | Siemens Energy Ag | US | OTC |
| 605100 | Power HF Co Ltd | CN | SHG |
| DEZ | DEUTZ Aktiengesellschaft | DE | XETRA |
| ENR | Siemens Energy AG | DE | XETRA |
| HYGN | Hydrogenetics Inc | US | US |