- Ahlstrom-Munksjo Oyj
- A. KAYSER AUTOMOTIVE SYSTEMS GmbH
- ALCO Filters Ltd
- Cummins Inc.
- DENSO CORPORATION
- Donaldson Company Inc.
- MAHLE GmbH
- MANN+HUMMEL
- Robert Bosch GmbH
- Sogefi Group
- Parker Hannifin Corp
- Hengst SE