1. Avista Oil Ag
2. Ergon Inc
3. Exxon Mobil Corporation
4. Grupa Lotos
5. Gs Caltex Corporation
6. Neste Oyj
7. Nynas Ab
8. Phillips 66 Company
9. Pt Pertamina (Persero)
10. Repsol Sa
11. Saudi Aramco
12. Sepahan Oil
13. Shell Plc
14. S-Oil Corporation
15. The Chevron Corporation