1. AKSA Power Generation
2. Atlas Copco AB
3. Caterpillar Inc.
4. Cummins Inc.
5. Doosan Corporation
6. Generac Holdings Inc.
7. General Electric Corporation
8. Honda Siel Power Products Ltd.
9. Kirloskar Oil Engines Limited
10. Kohler Co.
11. Kubota Corporation
12. Mitsubishi Heavy Industries
Ltd.
13. Rolls-Royce Holdings PLC
14. Su-Kam Power System Ltd.
15. Yamaha Motor Corporation