1. Caterpillar Inc.
2. Cleveland Brothers Equipment Co. Inc.
3. Cummins Inc.
4. Deutz AG
5. GENERAL ELECTRIC Company
6. Hyundai Heavy Industries Co. Ltd.
7. John Deere Group
8. Mahindra Powerol
9. MAN Energy Solutions SE
10. Marine Power USA
11. MITSUBISHI TURBOCHARGER AND ENGINE EUROPE B.V.
12. Rolls-Royce PLC
13. USA Marine Engines LLC
14. Volvo Group
15. W?rtsil? Corporation
16. YANMAR Marine International