1. Anglo Belgian Corporation NV
2. Anhui Quanchai Group Co. Ltd.
3. Caterpillar Inc.
4. CNPC Jichai Power Company Limited
5. Cummins Inc.
6. Daihatsu Diesel Manufacturing Co. Ltd.
7. Deere & Company
8. Deutz AG
9. Exxon Mobil Corporation
10. Guangxi Yuchai Machinery Group Co. Ltd
11. Guangzhou Diesel Engine Factory Ltd.
12. Honda Motor Co Ite
13. Hyundai Doosan Infracore Co. Ltd.
14. IHI Power Systems Co. Ltd.
15. Isotta Fraschini Motori SpA
16. Iveco Group NV
17. Kirloskar Group
18. Kohler Co.
19. Kunming Yunnei Power Co. Ltd.
20. Liebherr-International Deutschland GmbH
21. MAN Energy Solutions SE
22. Mitsubishi Heavy Industries
Ltd.
23. Motor-Services Hugo Stamp Inc.
24. Rolls-Royce Holdings PLC
25. Volvo Group
26. Webtec Corporation
27. Weichai Holding Group Co. Ltd.
28. W?rtsil? Corporation
29. Yanmar Holdings Co. Ltd