1. Alfa Chemistry
2. China Petrochemical Corporation
3. Citiblue International S.R.L
4. Exxon Mobil Corporation
5. Frontier Wax
6. Indian Oil Corporation Limited
7. International Group Inc.
8. Nippon Seiro Co. Ltd.
9. Petrobras
10. PetroChina International
11. Productes Quimics Naturals SL
12. Redox Ltd.
13. Sasol Limited
14. Shell PLC
15. Sinopec Corp.