| Accelleron Industries AG | Switzerland |
| Alternative Fuel Systems Inc. | Canada |
| Altronic, LLC | USA |
| Ambac International | USA |
| Arctic Fox, Inc. | USA |
| ASC Industries, Inc. | USA |
| ATG GmbH | Germany |
| Auto-Maskin AS | Norway |
| Autotronic Controls Corporation | USA |
| BAE Systems North America, Inc. | USA |
| BorgWarner BERU Systems GmbH | Germany |
| BorgWarner Inc. | USA |
| Capstone Green Energy Corporation | USA |
| Catalytic Air Technology, Inc. | USA |
| Ceramatec, Inc. | USA |
| China LuTong Parts Plant Co., Ltd. | China |
| Clean Air Power Inc. | USA |
| Clean Cam Technology Systems | USA |
| CMR France - Controle Mesure Regulation | France |
| Continental AG | Germany |
| Controlled Power Technologies Ltd. | UK |
| Controls Inc. | USA |
| Cosworth, LLC | USA |
| Datron Technology Ltd | UK |
| Delphi Technologies | USA |
| DynaGen Technologies Inc. | Canada |
| Dynalco Controls | USA |
| e-Components International, Inc. | USA |
| Eaton Corporation | USA |
| embitel GmbH | Germany |
| Engenious Engineering | USA |
| Engine Control Technology | USA |
| ETAS Inc. | USA |
| FloScan Instrument Co., Inc. | USA |
| Fritz Heinzmann GmbH & Co. | Germany |
| Gold Engineering GmbH | Germany |
| Griffin Thermal Products | USA |
| GT Precision Products Ltd | UK |
| Haynes Corporation | USA |
| Heraeus Nexensos GmbH | Germany |
| Hilkar Electrotechnics Ltd. | Turkey |
| Horton, Inc. | USA |
| Hotstart, Inc. | USA |
| Impco Technologies, Inc. | USA |
| IPD Inc. | USA |
| James Dawson & Son Ltd. | UK |
| Kams, Inc. | USA |
| Kavlico Corporation | USA |
| Kurz-Kasch, Inc. | USA |
| Letraw Mfg, LLC | USA |
| MACSEA Ltd | USA |
| Magneti Marelli S.p.A. | Italy |
| Main Filter Inc | USA |
| MANN+HUMMEL GmbH | Germany |
| Meritor Inc. | USA |
| Modine Manufacturing Co., Inc. | USA |
| Neutronics Enterprises Inc. | USA |
| Niranova AB | Sweden |
| Oto Perk A.S. | Turkey |
| Peel Instruments Pty. Ltd. | Australia |
| Phinia Inc. | USA |
| Pi Innovo | UK |
| Quantum Fuel Systems Technologies Worldwide Inc. | USA |
| Rail srl | Italy |
| Robert Bosch GmbH | Germany |
| Rotrak Ltd. | UK |
| Rotrex A/S | Denmark |
| Senior Automotive | UK |
| Sensor-NITE | Belgium |
| ServoTech Engineering | USA |
| SmartPlugs Corporation | USA |
| Solberg Manufacturing | USA |
| Sonex Research, Inc. | USA |
| Stanadyne Automotive Corp. | USA |
| Stoneridge | USA |
| TLX Technologies | USA |
| Torotrak plc | UK |
| Universal Engine Heater Company, Inc. | USA |
| UQM Technologies, Inc. | USA |
| Vepamon OU | Estonia |
| Watlow | USA |
| Woodward, Inc. | USA |