1. APAR INDUSTRIES LTD.
2. AVISTA OIL AG
3. CHEVRON CORPORATION
4. CALUMET SPECIALTY PRODUCTS PARTNERS
L.P.
5. ERGON NORTH & SOUTH AMERICA
6. EXXON MOBIL CHEMICAL COMPANY
7. GAZPROM
8. GP PETROLEUMS
9. HINDUSTAN PETROLEUM CORPORATION LTD.
10. HOLLYFRONTIER REFINING & MARKETING INC.
11. IDEMITSU KOSAN CO. LTD.
12. IRANOL COMPANY
13. JX NIPPON OIL & GAS EPLORATION
14. LANXESS PROCESS OIL
15. NYNAS AB
16. LUKOIL
17. ORGKHIM BIOCHEMICAL HOLDING
18. PANAMA PETROCHEM LTD.
19. PETRONAS LUBRICANTS INTERNATIONAL
20. PETROCHINA COMPANY LTD.
21. PETROBRAS
22. PHILLIPS 66 COMPANY
23. REPSOL SA
24. ROYAL DUTCH SHELL PLC
25. ROSNEFT
26. SASOL
27. SEPAHAN OIL COMPANY
28. SUNOCO LP
29. TOTAL SA