1. Mitsubishi Heavy Industries
2. Rolls-Royce Holdings plc
3. Doosan Heavy Industries & Construction
4. Caterpillar Inc.
5. Yanmar Co. Ltd.
6. Kohler Co.
7. Deutz AG
8. Daihatsu Diesel Mfg. Co. Ltd.
9. Waigaoqiao Shipbuilding Co. Ltd.
10. Hyundai Heavy Industries Engine & Machinery Division