1. Engel Austria GmbH
2. Nissei Plastic Industrial Co., Ltd
3. KraussMaffei Group GmbH
4. Husky Injection Molding Systems Ltd.
5. Arburg GmbH & Co. KG
6. Boy Machines Inc.
7. Sumitomo (SHI) Demag Plastics Machinery GmbH
8. Toshiba Machine Co., Ltd.
9. Milacron Holdings Corp.
10. Negri Bossi S.p.A.

Note that this ranking is based on various factors such as size, reputation, and industry impact and can change over time, This also not a definite ranking as it depend on person to person, industry to industry and region to region.