| Petro-Canada | Canada |
Private
|
| Petroamerica Oil Corp. | Canada |
Private
|
| PetroBakken Exploration Ltd. | Canada |
Private
|
| Petrobras America Inc | United States |
Private
|
| Petrobras Energia Participaciones S.A | Argentina |
Private
|
| Petrobras Global Finance B.V | Netherlands |
Private
|
| Petroceltic International Ltd | Republic of Ireland |
Private
|
| PETROCELTIC RESOURCES LIMITED | United Kingdom |
Private
|
| PetroGlobe Inc. | Canada |
Private
|
| Petrohawk Energy Corporation | United States |
Private
|
| Petrojack AS | Norway |
Private
|
| PetroKazakhstan Inc | Canada |
Private
|
| Petrol Export Import Bucharest | Romania |
Private
|
| Petrol Oil and Gas, Inc | United States |
Private
|
| Petrolane Gas Service L.P. | United States |
Private
|
| PetroLatina Energy Limited | United Kingdom |
Private
|
| Petroleos De Venezuela SA | Venezuela |
Private
|
| Petroleos Mexicanos S.A. de C.V. | Mexico |
Private
|
| Petroleum Company of Trinidad & Tobago Limited | Trinidad & Tobago |
Private
|
| Petroleum Equipment Assembly and Metal Structure Joint Stock Com | Vietnam |
Private
|
| Petroleum Heat and Power Inc. | United States |
Private
|
| Petrolinvest SA | Poland |
Private
|
| PetroMaroc Corp | Canada |
Private
|
| Petrominerales Ltd | Canada |
Private
|
| Petrominerals Corporation | United States |
Private
|
| Petron Energy II, Inc. | United States |
Private
|
| Petronas Capital Limited | Malaysia |
Private
|
| Petronas Energy Canada Ltd. | Canada |
Private
|
| Petronas LNG Ltd. | Malaysia |
Private
|
| PetroNova Inc | Colombia |
Private
|
| Petroplus Holdings AG | Switzerland |
Private
|
| Petroplus Tankstorage International B.V | Netherlands |
Private
|
| PetroSonic Energy Inc. | United States |
Private
|
| PetroTal Corp | United States |
Private
|
| Petrotarg AB | Sweden |
Private
|
| Petsec Energy, Inc. | United States |
Private
|
| PG & E Generating Company L.L.C. | United States |
Private
|
| Philadelphia Gas Works Co | United States |
Private
|
| Phillips 66 Company | United States |
Private
|
| Phillips Gas Co LLC | United States |
Private
|
| Phoenix Park Gas Processors Limited | Trinidad & Tobago |
Private
|
| Pilot Energy Services | United States |
Private
|
| Pinecrest Energy Inc | Canada |
Private
|
| Pinnacle Gas Resources Inc | United States |
Private
|
| PIONEER ENERGY SERVICES LLC | United States |
Private
|
| Pioneer Natural Resources USA, Inc. | United States |
Private
|
| Pioneer PE Holding LLC | United States |
Private
|
| Pioneer Southwest Energy Partners LP | United States |
Private
|
| PKM Canada Limited | Canada |
Private
|
| Placid Refining Company LLC | United States |
Private
|
| Plains Exploration & Production Co | United States |
Private
|
| Plains GP Holdings LP | United States |
Private
|
| Plains Marketing, L.P. | United States |
Private
|
| Plains Midstream Canada ULC | Canada |
Private
|
| Plains Resources Inc. | United States |
Private
|
| Plains Scurlock Permian, L P | United States |
Private
|
| Plant Offshore Group Ltd. | Chad |
Private
|
| Platinum Energy Resources, Inc. | United States |
Private
|
| Pledge Petroleum Corp | United States |
Private
|
| Pluspetrol Camisea S.A. | Peru |
Private
|
| Pool Energy Services Company | United States |
Private
|
| Portland Natural Gas Transmission System, L.P. | United States |
Private
|
| Powder River Petroleum International Inc | Canada |
Private
|
| Prairielands Energy Marketing, Inc. | United States |
Private
|
| PRAX UPSTREAM LTD. | United Kingdom |
Private
|
| PRD Energy Inc | Canada |
Private
|
| Precision Drilling (US) Corp | United States |
Private
|
| Preem AB | Sweden |
Private
|
| Preem Holdings AB | Sweden |
Private
|
| Premcor Inc | United States |
Private
|
| Premuda S.p.A. | Italy |
Private
|
| Pride International LLC | United States |
Private
|
| Pride Offshore Inc | United States |
Private
|
| Primax Colombia S.A. | Colombia |
Private
|
| Primera Energy Resources Limited | Canada |
Private
|
| PRIO SA | Brazil |
Private
|
| Production Enhancement Group Inc | United States |
Private
|
| Production Operators Corporation | United States |
Private
|
| Productive Technologies Company Limited | Bermuda |
Private
|
| Profound Energy Inc. | Canada |
Private
|
| Propernyn B.V. | Netherlands |
Private
|
| Prosafe Production Public Ltd | Cyprus |
Private
|
| ProspEx Resources Ltd. | Canada |
Private
|
| Providence Gas Co | United States |
Private
|
| PS Group Holdings, Inc. | United States |
Private
|
| PT Kilang Pertamina Internasional | Indonesia |
Private
|
| PT Pertamina (Persero) | Indonesia |
Private
|
| PTT Aromatics and Refining Public Company Ltd | Thailand |
Private
|
| Pure Resources, Inc. | United States |
Private
|
| PUREWEST RESOURCES, INC. | United States |
Private
|
| PYR Energy Corporation | United States |
Private
|
| Pyramid Petroleum Inc. | Canada |
Private
|
| Qatar Energy | Qatar |
Private
|
| QR Energy, LP | United States |
Private
|
| Quaker State Corporation | United States |
Private
|
| Queensland Gas Company Ltd | Australia |
Private
|
| Quest Energy Partners, L.P. | United States |
Private
|
| Quicksilver Resources, Inc. | United States |
Private
|
| Quiktrip Corporation | United States |
Private
|
| R & B Falcon Corp | United States |
Private
|
|
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