| Olivier Ventures Inc. | Canada |
Public
|
| Oman Oil Marketing Company SAOG | Oman |
Public
|
| OMDA Oil and Gas, Inc. | United States |
Public
|
| Omskoblgaz OAO | Russia |
Public
|
| OMV AG | Austria |
Public
|
| OMV Petrol Ofisi AS | Turkey |
Public
|
| OMV Petrom S.A. | Romania |
Public
|
| ONEOK, Inc. | United States |
Public
|
| ONICO S.A. | Poland |
Public
|
| OPTIMIND PHARMA CORP | Canada |
Public
|
| Oracle Energy Corporation | Canada |
Public
|
| Orca Energy Group Inc. | Tanzania |
Public
|
| Organizacion Terpel S.A. | Colombia |
Public
|
| Oriental Petroleum & Minerals Corporation | Philippines |
Public
|
| ORLEN S.A. | Poland |
Public
|
| Osage Exploration and Development Inc. | United States |
Public
|
| Osyka Corp | United States |
Public
|
| Otaki Gas Company, Limited | Japan |
Public
|
| Otto Energy Limited | Australia |
Public
|
| Ouhua Energy Holdings Limited | China |
Public
|
| Outback Oil & Mineral Exploration Corp. | United States |
Public
|
| OVINTIV CANADA ULC | Canada |
Public
|
| Ovintiv Exploration Inc | United States |
Public
|
| Oyco, Inc. | United States |
Public
|
| Oyo Corporation | Japan |
Public
|
| P/F Atlantic Petroleum | Faroe Islands |
Public
|
| PA Resources AB | Sweden |
Public
|
| Pacific Drilling S.A. | United States |
Public
|
| Pacifica Holdings Inc | Philippines |
Public
|
| Padma Oil Co Ltd | Bangladesh |
Public
|
| Painted Pony Energy Ltd | Canada |
Public
|
| Pakistan Oilfields Ltd | Pakistan |
Public
|
| Pakistan Petroleum Ltd. | Pakistan |
Public
|
| Pakistan Refinery Ltd | Pakistan |
Public
|
| Pakistan State Oil Company Ltd | Pakistan |
Public
|
| Paloma Resources Inc. | Canada |
Public
|
| PAMBILI NATURAL RESOURCES CORPORATION | Canada |
Public
|
| Pampa Energia S.A. | Argentina |
Public
|
| PAN PACIFIC PETROLEUM PTY LTD | Australia |
Public
|
| Panaco, Inc. | United States |
Public
|
| PANCONTINENTAL ENERGY NL | Australia |
Public
|
| Panoro Energy ASA | Norway |
Public
|
| PANTERA SILVER CORP | Canada |
Public
|
| Pantheon Resources PLC | United Kingdom |
Public
|
| Par Pacific Holdings, Inc | United States |
Public
|
| Paradigm Oil & Gas, Inc. | United States |
Public
|
| ParaFin Corp | United States |
Public
|
| Paramount Resources Ltd. | Canada |
Public
|
| PARENT CAPITAL CORP | Canada |
Public
|
| Parex Resources Inc | Canada |
Public
|
| Parker Drilling Company | United States |
Public
|
| Patch International Inc. | Canada |
Public
|
| PATERSON RESOURCES LTD | Australia |
Public
|
| Patriot Energy Corp | United States |
Public
|
| Patterson-UTI Energy Inc. | United States |
Public
|
| Pawnee Energy Limited | Australia |
Public
|
| Paz Oil Company Ltd. | Israel |
Public
|
| PBF Energy Inc | United States |
Public
|
| PDC Energy, Inc | United States |
Public
|
| Pedevco Corp. | United States |
Public
|
| Pembina Pipeline Corporation | Canada |
Public
|
| Penn West Santiago Ltd | Canada |
Public
|
| Perdana Petroleum Berhad | Malaysia |
Public
|
| Perpetual Energy Inc | Canada |
Public
|
| Persta Resources Inc | Canada |
Public
|
| Perusahaan Gas Negara Tbk PT | Indonesia |
Public
|
| Petrel Resources plc | Republic of Ireland |
Public
|
| Petrleo Brasileiro S.A. - Petrobras | Brazil |
Public
|
| Petro Matad Ltd. | Mongolia |
Public
|
| Petro River Oil Corp. | United States |
Public
|
| Petro Vietnam LPG Joint Stock Company | Vietnam |
Public
|
| Petro-king Oilfield Services Limited | China |
Public
|
| Petrobras Argentina SA | Argentina |
Public
|
| PetroChina Company Limited | China |
Public
|
| PetroEnergy Resources Corporation | Philippines |
Public
|
| Petrofac Limited | United Kingdom |
Public
|
| Petroflow Energy Ltd. | United States |
Public
|
| Petrogrand AB | Sweden |
Public
|
| Petrogress, Inc. | United States |
Public
|
| PetroHunter Energy Corp | United States |
Public
|
| Petrol AD | Bulgaria |
Public
|
| Petrol One Corp | Canada |
Public
|
| Petroleos del Peru Petroperu S.A. | Peru |
Public
|
| Petrolera Del Conosur S.A. | Argentina |
Public
|
| Petroleum Mechanical JSC | Vietnam |
Public
|
| Petroleum Services Group AS | Norway |
Public
|
| Petrolia SE | Cyprus |
Public
|
| Petrolimex Petrochemical Corporation - Joint Stock Company | Vietnam |
Public
|
| Petrolimex Saigon Transportation and Service JSC | Vietnam |
Public
|
| Petrolina Holdings Public Ltd | Cyprus |
Public
|
| Petromanas Acquisitions Ltd | Canada |
Public
|
| Petromin Resources Ltd. | Canada |
Public
|
| Petron Corporation | Philippines |
Public
|
| Petron Malaysia Refining & Marketing Bhd | Malaysia |
Public
|
| Petronas Dagangan Berhad | Malaysia |
Public
|
| Petronas Gas Bhd | Malaysia |
Public
|
| PetroNeft Resources PLC | Republic of Ireland |
Public
|
| Petronet LNG Ltd | India |
Public
|
| Petroquest Energy Inc | United States |
Public
|
| PetroShare Corp | United States |
Public
|
|
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