- Advanced Automated Systems
- ArvinMeritor
- Altronic
- Ambac International
- Arctic Fox
- ASC Industries
- ATG GmbH
- Auto-Maskin AS
- Autotronic Controls Corporation
- Avtron Manufacturing
- BAE Systems North America
- Beru Corporation
- BorgWarner Inc.
- Bosch, Robert, GmbH
- Capstone Turbine Corporation
- Ceramatec, Inc.
- Clean Air Technology
- Clean Cam Technology
- CMR Schroeder
- Controls Inc.
- Cosworth Engineering
- Datron Technology
- Dayco ENSA
- Dawson, James, & Son Ltd.
- Delco Electronics
- Delphi Automotive Systems
- Delphi Diesel Systems
- Dynalco Controls
- e-Components International
- Eaton Corporation
- ETAS Inc.
- Filtrec North America
- FloScan Instrument
- Gold Engineering GmbH
- Griffin Thermal Products
- Heinzmann, Fritz GmbH
- Hilkar Electrotechnics (Turkey)
- Haynes Corporation
- Horton, Inc.
- INOV8 Technologies plc
- International Engine Technologies
- IPD Inc.
- Kavlico Corporation
- Kim Hotstart Mfg
- Kurz-Kasch
- Letraw Manufacturing
- Li Jun Enterprise (Taiwan)
- MACSEA Ltd
- Magneti Marelli
- MANN+HUMMEL GmbH
- McKechnie Vehicle Components
- Mirenco Technologies
- Modine Manufacturing Co.
- Moonrise Industries (India)
- Neutronics Enterprises
- NIRA Nova AB
- Oto Perk A.S. (Turkey)
- Pi Technology
- Senior Automotive
- Shung Fon Industries
- Siemens AG, Bereich Automobiltechnik
- SmartPlugs Corporation
- Solectria Corporation
- Sonex Research
- Stanadyne Automotive Corp.
- Turbodyne Technologies
- UQM Technologies
- Universal Engine Heater Company