1. Ahlstrom-Munksjo Oyj
2. ALCO Filters Ltd.
3. CabinAir Sweden AB
4. Cummins Inc.
5. Denso Corporation
6. Donaldson Company Inc.
7. Freudenberg Filtration Technologies SE & Co. KG
8. General Motors Company
9. Hengst SE
10. Hollingsworth & Vose GmbH
11. K&N Engineering Inc.
12. MAHLE GmbH
13. MANN+HUMMEL International GmbH & Co. KG
14. Parker Hannifin Corporation
15. Robert Bosch GmbH
16. Sogefi S.p.A.
17. Toyota Boshoku Corporation
18. Valeo S.A.