Large Oil Companies by Country of Origin

Assam Company Ltd (ACL)
Abu Dhabi National Oil Company (ADNOC)
Alon USA
Amerada Hess Corporation
Anadarko Petroleum Corporation
Apache Corporation
Arbusto Energy
Atlantic Petroleum
BG Group
Bharat Petroleum Corporation Limited
BHP Billiton
BP
Cairn Energy
Canadian Natural Resources
Chevron Corporation
Citgo
CNOOC Ltd.
ConocoPhillips
Crown Central Petroleum
Cupet
Devon Energy
Ecopetrol
Enbridge
EnCana
ENSCO International
Eni
Entreprise Tunisienne d'Activites Petroliere (ETAP)
ExxonMobil
Galp Energia
Petronet LNG Limited
Gujarat Gas Co. Ltd.
Gujarat State Petroleum Corporation
Gulf Oil
Grupa LOTOS
Hellenic Petroleum
Husky Energy
Imperial Oil
INA - Industrija Nafte
Indian Oil Corporation
Irving Oil
Kerr-McGee
Koch Industries
Kuwait German Petroleum Company
LUKoil
Marathon Oil Corporation
Maxol Group
MedcoEnergi
Mol Group
Naftna Industrija Srbije
National Iranian Oil Company (NIOC)
National Oil Corporation
Neste Oil
NNPC
Oil & Gas Development Company Limited
Occidental Petroleum
Oil India Limited
Oman Oil Company (OOC)
OMV
ONGC
PKN Orlen S.A.
PSO
Petróleos de Venezuela
Petroleos Mexicanos
Petro-Canada
Petrobras
PetroChina
PetroKazakhstan
Petrom
Petron Corporation
PETRONAS
PETROTRIN
Pertamina
Polish Oil and Gas Company
Qatar Petroleum
Reliance Industries Limited
Repsol YPF
Rompetrol Group N.V.
Royal Dutch Shell
Santos Limited
Sasol
Saudi Aramco
Shell Canada
Shell Oil Company
Sinclair Oil
Sinopec
Sonangol
Sonatrach
SPC
StatoilHydro
State Oil Company of Azerbaijan
Sunoco
Suncor Energy
Surgutneftegaz
Syncrude
Talisman Energy
Todd Energy
Total
United Refining Company
Vaalco Energy Inc.
Wintershall
Woodside Petroleum
YPFB
YUKOS