BP plc
Chevron Corporation
China Petroleum & Chemical Corporation (Sinopec)
ENEOS Holdings Inc. Exxon Mobil Corporation
Fuchs Petrolub SE
Gazprom Neft PJSC
Hindustan Petroleum Corporation Limited (HPCL)
Idemitsu Kosan Company Ltd. Indian Oil Corporation Limited (IOCL)
PetroChina Company Limited
Petroleo Brasileiro S.A. Petroliam Nasional Berhad (PETRONAS)
PJSC Lukoil
PT Pertamina (Persero)
Royal Dutch Shell plc
The Phillips 66 Company
Total SA
Valvoline Inc.